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            "abstractNote": "Electric properties are systematically investigated for an all solid ion-transfer device made by various transition metal cyanide films, NaxCo[Fe(CN)6]0.90centerdot2.9H2O (NCF90), NaxCo[Fe(CN)6]0.71centerdot3.8H2O (NCF71), and NaxNi[Fe(CN)6]0.68centerdot5.1H2O (NNF68). On the basis of scanning electron microscope (SEM) analysis and X-ray diffraction analysis, we concluded that the NCF90 film consists of weakly (111)-oriented large rod like crystals, while the NCF71 film consists of (111)-oriented fine needle like crystals grown perpendicular to the substrate. On the other hand, granular particles are piled up in the NNF68 film. We found that the devices made by the NCF90 and NCF71 films show rapid ion transfer (response time τ= 1 s at 1 V), while the device made by the NNF68 film shows a slow response (τ= 6 s at 1 V). These results indicate that crystalline film is indispensable for rapid device response.",
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            "abstractNote": "A thin film of a transition metal cyanide is a promising positive electrode material for a Li ion secondary battery. Here, we investigated the surface morphologies of Na1.60Co[Fe(CN)6]0.902.9H2O by atomic force microscopy (AFM) and scanning electron microscopy (SEM) against film thickness (t). We observed a crossover behavior of the growth mode from the three-dimensional (3D) type to the one-dimensional (1D) type at the threshold thickness (tth ≈250 nm). We found that the growth mode is governed by the intradomain grain coverage (γD), not by the conventional surface coverage (γ).",
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    {
        "key": "29FM33C3",
        "version": 4446,
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            "creatorSummary": "Orellana et al.",
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        "data": {
            "key": "29FM33C3",
            "version": 4446,
            "itemType": "journalArticle",
            "title": "Chronocoulometric Study of the Electrochemistry of Prussian Blue",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Marco",
                    "lastName": "Orellana"
                },
                {
                    "creatorType": "author",
                    "firstName": "Pamela",
                    "lastName": "Arriola"
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                {
                    "creatorType": "author",
                    "firstName": "Rodrigo",
                    "lastName": "Del Río"
                },
                {
                    "creatorType": "author",
                    "firstName": "Ricardo",
                    "lastName": "Schrebler"
                },
                {
                    "creatorType": "author",
                    "firstName": "Ricardo",
                    "lastName": "Cordova"
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                {
                    "creatorType": "author",
                    "firstName": "Fritz",
                    "lastName": "Scholz"
                },
                {
                    "creatorType": "author",
                    "firstName": "Heike",
                    "lastName": "Kahlert"
                }
            ],
            "abstractNote": "During the electrochemical oxidation of Prussian blue (PB) to Prussian yellow (PY), an electrocatalytic oxygen production proceeds at the electrode when aqueous electrolyte solutions are used. The formed oxygen is scavenged by the PY, probably by absorption, and it is consumed during the electrochemical reduction of PY to PB by a heterogeneous chemical reaction of PB with oxygen to PY and hydrogen peroxide. Because of this catalytic regeneration of PY, it is impossible to determine the amount of low-spin iron by chronocoulometry using a potential program in which PB is first oxidized to PY and then the charge is measured to reduce PY to PB. The latter charge is biased by the electrocatalytic PY regeneration.",
            "publicationTitle": "The Journal of Physical Chemistry B",
            "publisher": "",
            "place": "",
            "date": "August 1, 2005",
            "volume": "109",
            "issue": "32",
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            "partNumber": "",
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            "pages": "15483-15488",
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            "journalAbbreviation": "J. Phys. Chem. B",
            "DOI": "10.1021/jp051895a",
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            "url": "http://dx.doi.org/10.1021/jp051895a",
            "accessDate": "",
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            "PMCID": "",
            "ISSN": "1520-6106",
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            "language": "",
            "libraryCatalog": "ACS Publications",
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            "tags": [
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                    "tag": "CA"
                },
                {
                    "tag": "CC"
                },
                {
                    "tag": "Fe"
                },
                {
                    "tag": "HCF"
                },
                {
                    "tag": "OER"
                },
                {
                    "tag": "PBA"
                },
                {
                    "tag": "catalysis"
                }
            ],
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            "relations": {},
            "dateAdded": "2020-06-15T13:56:31Z",
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        }
    },
    {
        "key": "9E7WM3VV",
        "version": 4451,
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            "creatorSummary": "Igarashi et al.",
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            "itemType": "journalArticle",
            "title": "Electronic structure of hole-doped Co-Fe cyanides: Na<sub>1.60-δ</sub>Co[Fe(CN)<sub>6</sub>]<sub>0.90</sub> ⋅ 2.9H<sub>2</sub>O (0 ≤ δ ≤ 0.85)",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "K.",
                    "lastName": "Igarashi"
                },
                {
                    "creatorType": "author",
                    "firstName": "F.",
                    "lastName": "Nakada"
                },
                {
                    "creatorType": "author",
                    "firstName": "Y.",
                    "lastName": "Moritomo"
                }
            ],
            "abstractNote": "Lattice, magnetic, and optical properties are investigated for films of Prussian-blue-type cyanides, Na1.60−δCo[Fe(CN)6]0.90⋅2.9H2O (0.0≤δ≤0.85), as a function of hole concentration δ of the d-electron system. The mother compound (δ=0) takes the Co2+ (t52ge2g:S=3/2)-Fe2+ (t62g:S=0) configuration, and the holes are selectively introduced on the Co site. We found that effective magnetic moment μeff decreases with δ, indicating that the Co3+ ion takes a low-spin state (t62g:S=0). Visible absorption spectra are dominated by three absorption bands at ≈2.2 eV, ≈3.3 eV, and ≈3.8 eV, which are ascribed to charge transfer from Fe2+ to Co3+ sites, CN− to Fe2+ sites, and CN− to Co3+ sites, respectively. Based on these assignments, we proposed an electronic structure model. We further comprehensively discuss variation in the electronic structure with change in the transition-metal site.",
            "publicationTitle": "Physical Review B",
            "publisher": "",
            "place": "",
            "date": "December 5, 2008",
            "volume": "78",
            "issue": "23",
            "section": "",
            "partNumber": "",
            "partTitle": "",
            "pages": "235106",
            "series": "",
            "seriesTitle": "",
            "seriesText": "",
            "journalAbbreviation": "Phys. Rev. B",
            "DOI": "10.1103/PhysRevB.78.235106",
            "citationKey": "",
            "url": "https://doi.org/10.1103/PhysRevB.78.235106",
            "accessDate": "2020-06-14T18:45:16Z",
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            "shortTitle": "Electronic structure of hole-doped Co-Fe cyanides",
            "language": "",
            "libraryCatalog": "APS",
            "callNumber": "",
            "rights": "",
            "extra": "Publisher: American Physical Society",
            "tags": [
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                    "tag": "Co"
                },
                {
                    "tag": "Fe"
                },
                {
                    "tag": "HCF"
                },
                {
                    "tag": "PBA"
                },
                {
                    "tag": "thin films"
                }
            ],
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            "dateAdded": "2020-06-15T12:45:19Z",
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    {
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            "creatorSummary": "Nakada et al.",
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        "data": {
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            "version": 4451,
            "itemType": "journalArticle",
            "title": "Electronic phase diagram of valence-controlled cyanide: Na<sub>0.84-δ</sub>Co[Fe(CN)<sub>6</sub>]<sub>0.71</sub> ⋅ 3.8H<sub>2</sub>O (0 ≤ δ ≤ 0.61)",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "F.",
                    "lastName": "Nakada"
                },
                {
                    "creatorType": "author",
                    "firstName": "H.",
                    "lastName": "Kamioka"
                },
                {
                    "creatorType": "author",
                    "firstName": "Y.",
                    "lastName": "Moritomo"
                },
                {
                    "creatorType": "author",
                    "firstName": "J. E.",
                    "lastName": "Kim"
                },
                {
                    "creatorType": "author",
                    "firstName": "M.",
                    "lastName": "Takata"
                }
            ],
            "abstractNote": "Electronic phase diagram has been derived for the Prussian-Blue-type cyano-bridged transition-metal compound, Na0.84−δCo[Fe(CN)6]0.71⋅3.8H2O (0.0≤δ≤0.61), as a function of the hole concentration δ of the d-electron system. The mother compound (δ=0) takes the Co2+ (t52ge2g:S=3/2) and Fe2+ (t62g:S=0) configuration and is paramagnetic down to zero temperature. At room temperature, the holes are selectively introduced on the Fe site. A slight hole doping (δ=0.13) causes the charge-transfer (CT) transition, that is, cooperative electron transfer from the Co2+ site to the Fe3+ site, with a decrease in temperature below TCT≈250 K. With a further increase in δ, TCT slightly decreases from ≈230 K at δ=0.24 to ∼210 K at δ=0.61. Accordingly, the nature of the transition changes from the second-order type to the first-order type. In all the concentration ranges, the high-temperature (HT) phase is metastable even at low temperature. In this metastable phase, the Fe3+ (t52g:S=1/2) species mediate the ferromagnetic exchange coupling between the adjacent Co2+ spins. The ferromagnetic transition appears at δ=0.39, and the transition temperature TC increase from 7 K at δ=0.39 to 13 K at δ=0.61. Based on these experimental data, we will discuss the significant roles of the coupling between the charge, spin, and lattice degrees of freedom in the transition-metal cyanides.",
            "publicationTitle": "Physical Review B",
            "publisher": "",
            "place": "",
            "date": "June 23, 2008",
            "volume": "77",
            "issue": "22",
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            "pages": "224436",
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            "seriesTitle": "",
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            "journalAbbreviation": "Phys. Rev. B",
            "DOI": "10.1103/PhysRevB.77.224436",
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            "shortTitle": "Electronic phase diagram of valence-controlled cyanide",
            "language": "",
            "libraryCatalog": "APS",
            "callNumber": "",
            "rights": "",
            "extra": "Publisher: American Physical Society",
            "tags": [
                {
                    "tag": "Co"
                },
                {
                    "tag": "Fe"
                },
                {
                    "tag": "HCF"
                },
                {
                    "tag": "PBA"
                },
                {
                    "tag": "thin films"
                }
            ],
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                "GSWM75RW"
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            "dateAdded": "2020-06-15T12:39:13Z",
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    },
    {
        "key": "QPH4XRH6",
        "version": 4443,
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            },
            "creatorSummary": "Takachi et al.",
            "parsedDate": "2013-04-01",
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        },
        "data": {
            "key": "QPH4XRH6",
            "version": 4443,
            "itemType": "journalArticle",
            "title": "Structural, Electronic, and Electrochemical Properties of LixCo[Fe(CN)6]0.902.9H2O",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Masamitsu",
                    "lastName": "Takachi"
                },
                {
                    "creatorType": "author",
                    "firstName": "Tomoyuki",
                    "lastName": "Matsuda"
                },
                {
                    "creatorType": "author",
                    "firstName": "Yutaka",
                    "lastName": "Moritomo"
                }
            ],
            "abstractNote": "Prussian blue analogues with jungle-gym-type structure are promising candidates for cathode materials of the lithium-ion secondary battery (LIB). Here, we investigated the structural, electronic, and electrochemical properties of cobalt hexacyanoferrate, LixCo[Fe(CN)6]0.902.9H2O, against Li concentration (x). The capacity (= 139 mAh/g) of the thin-film electrode was close to the ideal value (= 132 mAh/g) for the two-electron reaction. The discharge curve exhibits three plateaus, i.e., plateaus I, II, and III. The material exhibits a first-order phase transition accompanied by significant volume expansion by 7% at the boundary between plateaus II and III. Ex situ X-ray absorption spectroscopy (XAS) indicates that the discharge processes of plateaus I, II, and III are ascribed to the reduction processes of Fe3+, Co3+, and Fe3+, respectively. The rate (r) and cycle (n) dependence of the electrode performance will be discussed in terms of the reduction processes.",
            "publicationTitle": "Japanese Journal of Applied Physics",
            "publisher": "",
            "place": "",
            "date": "2013-04-01",
            "volume": "52",
            "issue": "4R",
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            "pages": "044301",
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            "journalAbbreviation": "Jpn. J. Appl. Phys.",
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                    "tag": "Co"
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                {
                    "tag": "Fe"
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                {
                    "tag": "HCF"
                },
                {
                    "tag": "Li+"
                },
                {
                    "tag": "PBA"
                },
                {
                    "tag": "battery"
                }
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            "dateAdded": "2020-06-12T20:13:02Z",
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    {
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            "creatorSummary": "Moritomo et al.",
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        "data": {
            "key": "TMZ48Q5J",
            "version": 4442,
            "itemType": "journalArticle",
            "title": "Synchrotron-Radiation X-Ray Investigation of Li+/Na+ Intercalation into Prussian Blue Analogues",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Yutaka",
                    "lastName": "Moritomo"
                },
                {
                    "creatorType": "author",
                    "firstName": "Masamitsu",
                    "lastName": "Takachi"
                },
                {
                    "creatorType": "author",
                    "firstName": "Yutaro",
                    "lastName": "Kurihara"
                },
                {
                    "creatorType": "author",
                    "firstName": "Tomoyuki",
                    "lastName": "Matsuda"
                }
            ],
            "abstractNote": "Prussian blue analogies (PBAs) are promising cathode materials for lithium ion (LIB) and sodium ion (SIB) secondary batteries, reflecting their covalent and nanoporous host structure. With use of synchrotron-radiation (SR) X-ray source, we investigated the structural and electronic responses of the host framework of PBAs against Li",
            "publicationTitle": "Advances in Materials Science and Engineering",
            "publisher": "",
            "place": "",
            "date": "2013/10/08",
            "volume": "2013",
            "issue": "",
            "section": "",
            "partNumber": "",
            "partTitle": "",
            "pages": "967285",
            "series": "",
            "seriesTitle": "",
            "seriesText": "",
            "journalAbbreviation": "Adv. Mater. Sci. Eng.",
            "DOI": "10.1155/2013/967285",
            "citationKey": "",
            "url": "http://www.hindawi.com/journals/amse/2013/967285/abs/",
            "accessDate": "2014-10-08T17:28:15Z",
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            "PMCID": "",
            "ISSN": "1687-8434",
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            "shortTitle": "",
            "language": "en",
            "libraryCatalog": "www.hindawi.com",
            "callNumber": "",
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                    "tag": "Cd"
                },
                {
                    "tag": "Co"
                },
                {
                    "tag": "Fe"
                },
                {
                    "tag": "HCF"
                },
                {
                    "tag": "Li+"
                },
                {
                    "tag": "Mn"
                },
                {
                    "tag": "Na+"
                },
                {
                    "tag": "Ni"
                },
                {
                    "tag": "PBA"
                },
                {
                    "tag": "battery"
                }
            ],
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            "dateAdded": "2020-06-12T20:08:17Z",
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            },
            "creatorSummary": "Moritomo et al.",
            "parsedDate": "2012-03-15",
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        "data": {
            "key": "TAH7RL4M",
            "version": 4441,
            "itemType": "journalArticle",
            "title": "Thin Film Electrodes of Prussian Blue Analogues with Rapid Li<sup>+</sup> Intercalation",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Yutaka",
                    "lastName": "Moritomo"
                },
                {
                    "creatorType": "author",
                    "firstName": "Masamitsu",
                    "lastName": "Takachi"
                },
                {
                    "creatorType": "author",
                    "firstName": "Yutaro",
                    "lastName": "Kurihara"
                },
                {
                    "creatorType": "author",
                    "firstName": "Tomoyuki",
                    "lastName": "Matsuda"
                }
            ],
            "abstractNote": "A new class of electrode materials are being intensively investigated to achieve a low-cost Li+ secondary battery (LIB) with a high discharge rate. Here, we investigated the discharge rate in thin film electrodes of the Prussian blue analogues (Li,Na)4y-2M[Fe(CN)6]yzH2O (M =Ni, Co, Mn, and Cd). Except for the Co compound, the capacities at 100 C exceed 60% of those at 1 C. We further investigated the electronic and crystal structures of Prussian blue analogues against Li+ concentration (x). On the basis of these data, we will discuss the origin of the rapid Li+ intercalation.",
            "publicationTitle": "Applied Physics Express",
            "publisher": "",
            "place": "",
            "date": "2012-03-15",
            "volume": "5",
            "issue": "4",
            "section": "",
            "partNumber": "",
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            "title": "Electrochemical Properties and Redox Mechanism of Na2Ni0.4Co0.6[Fe(CN)6] Nanocrystallites as High-Capacity Cathode for Aqueous Sodium-Ion Batteries",
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                    "firstName": "Hyun-Wook",
                    "lastName": "Lee"
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            "publicationTitle": "Faraday Discussions",
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                    "firstName": "Colin D.",
                    "lastName": "Wessells"
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            "abstractNote": "The electrical energy grid has a growing need for energy storage to address short-term transients, frequency regulation, and load leveling. Though electrochemical energy storage devices such as batteries offer an attractive solution, current commercial battery technology cannot provide adequate power, and cycle life, and energy efficiency at a sufficiently low cost. Copper hexacyanoferrate and nickel hexacyanoferrate, two open framework materials with the Prussian Blue structure, were recently shown to offer ultralong cycle life and high-rate performance when operated as battery electrodes in safe, inexpensive aqueous sodium ion and potassium ion electrolytes. In this report, we demonstrate that the reaction potential of copper?nickel alloy hexacyanoferrate nanoparticles may be tuned by controlling the ratio of copper to nickel in these materials. X-ray diffraction, TEM energy dispersive X-ray spectroscopy, and galvanostatic electrochemical cycling of copper?nickel hexacyanoferrate reveal that copper and nickel form a fully miscible solution at particular sites in the framework without perturbing the structure. This allows copper?nickel hexacyanoferrate to reversibly intercalate sodium and potassium ions for over 2000 cycles with capacity retentions of 100% and 91%, respectively. The ability to precisely tune the reaction potential of copper?nickel hexacyanoferrate without sacrificing cycle life will allow the development of full cells that utilize the entire electrochemical stability window of aqueous sodium and potassium ion electrolytes.",
            "publicationTitle": "ACS Nano",
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            "title": "Prussian blue: a new framework of electrode materials for sodium batteries",
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                    "firstName": "Yuhao",
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                    "creatorType": "author",
                    "firstName": "Long",
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                    "firstName": "Jinguang",
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                    "creatorType": "author",
                    "firstName": "John B.",
                    "lastName": "Goodenough"
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            "abstractNote": "Prussian blue and its analogues consisting of different transition-metal ions (Fe, Mn, Ni, Cu, Co and Zn) have been synthesized at room temperature. Insertion of Na into KFe2(CN)6 in a carbonate electrolyte exhibited a reversible capacity near 100 mA h g−1 with no capacity fade in 30 cycles. The data indicate that a Na-ion battery with a Prussian blue framework as a cathode will be feasible.",
            "publicationTitle": "Chemical Communications",
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            "pages": "6544-6546",
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            "journalAbbreviation": "Chem. Commun.",
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                    "firstName": "Tomoyuki",
                    "lastName": "Matsuda"
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            "abstractNote": "A thin film of sodium manganese ferrocyanide, Na1.32Mn[Fe(CN)6]0.83·3.5H2O, exhibits discharge capacity (= 109 mA h g−1) and discharge voltage (3.4 V in average) at 0.5 C against Na in aprotic solvent. The ex situ XRD experiments reveal that the host framework remains cubic without showing any structural phase transition during the charge process. The discharge property is discernible up to 40 C.",
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            "partNumber": "",
            "partTitle": "",
            "pages": "2750-2752",
            "series": "",
            "seriesTitle": "",
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                    "tag": "HCF"
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            "collections": [
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            "dateAdded": "2020-05-21T15:27:08Z",
            "dateModified": "2020-05-21T15:27:08Z"
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]