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In situ IR spectroscopy during oxidation process of cobalt Prussian blue analogues.

ABSTRACT: Cobalt Prussian blue analogues (Co-PBA; Na_xCo[Fe(CN)₆]_y), consisting of cyano-bridged transition metal network, -Fe-CN-Co-NC-Fe-, are promising cathode materials for Na-ion secondary batteries. In the oxidation process, oxidization of Fe and/or Co are compensated by Na⁺ deintercalation. Here, we investigated the oxidization process of three Co-PBAs by means of in situ infrared absorption (IR) spectroscopy. With use of an empirical rule of the frequencies of the CN^- stretching mode in ferrocyanide ([Fe^II(CN)₆]^4-) and ferricyanide ([Fe^III(CN)₆]^3-), the oxidation processes of Co-PBAs were determined against the Fe concentration (y) and temperature (T). We will discuss the interrelation between the oxidation processes and Fe concentration (y).

SUBMITTER: Niwa H

PROVIDER: S-EPMC7892820 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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In situ IR spectroscopy during oxidation process of cobalt Prussian blue analogues.

Niwa Hideharu H Moriya Toshiaki T Shibata Takayuki T Fukuzumi Yuya Y Moritomo Yutaka Y

Scientific reports 20210218 1

Cobalt Prussian blue analogues (Co-PBA; NaxCo[Fe(CN)6]y), consisting of cyano-bridged transition metal network, -Fe-CN-Co-NC-Fe-, are promising cathode materials for Na-ion secondary batteries. In the oxidation process, oxidization of Fe and/or Co are compensated by Na+ deintercalation. Here, we investigated the oxidization process of three Co-PBAs by means of in situ infrared absorption (IR) spectroscopy. With use of an empirical rule of the frequenci ...[more]

PMID: 33603152

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