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Selective Control of Composition in Prussian White for Enhanced Material Properties
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-8658-8938
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0001-9304-8975
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2019 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 31, no 18, p. 7203-7211Article in journal (Refereed) Published
Abstract [en]

Sodium-ion batteries based on Prussian blue analogues (PBAs) are ideal for large-scale energy storage applications due to the ability to meet the huge volumes and low costs required. For Na2-xFe[Fe(CN)(6)](1-y)center dot zH(2)O, realizing its commercial potential means fine control of the concentration of sodium, Fe(CN)(6) vacancies, and water content. To date, there is a huge variation in the literature of composition leading to variable electrochemical performance. In this work, we break down the synthesis of PBAs into three steps for controlling the sodium, vacancy, and water content via an inexpensive, scalable synthesis method. We produce rhombohedral Prussian white Na1.88(5)Fe[Fe-(CN)(6)]center dot 0.18(9)H2O with an initial capacity of 158 mAh/g retaining 90% capacity after 50 cycles. Subsequent characterization revealed that the increased polarization on the 3 V plateau is coincident with a phase transition and reduced utilization of the high-spin Fe(III)/Fe(II) redox couple. This reveals a clear target for subsequent improvements of the material to boost long-term cycling stability. These results will be of great interest for the myriad of applications of PBAs, such as catalysis, magnetism, electrochromics, and gas sorption.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 31, no 18, p. 7203-7211
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Materials Chemistry Physical Chemistry
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URN: urn:nbn:se:uu:diva-395840DOI: 10.1021/acs.chemmater.9b01494ISI: 000487859200012OAI: oai:DiVA.org:uu-395840DiVA, id: diva2:1365547
Funder
StandUpSwedish Research Council, 2016-03441ÅForsk (Ångpanneföreningen's Foundation for Research and Development)Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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Brant, WilliamMogensen, RonnieColbin, SimonOjwang, Dickson O.Younesi, Reza

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Brant, WilliamMogensen, RonnieColbin, SimonOjwang, Dickson O.Jaworski, AleksanderPell, Andrew J.Younesi, Reza
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