Iron oxyhydroxide hierarchical micro/nanostructured film as catalyst for electrochemical oxygen evolution reaction

Ke Hsuan Wang, Genta Watanabe, Hayato Ikeuchi, Siyang Cui, I. Ping Liu, Kanta Yamada, Masaaki Yoshida, Takeshi Kawai

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A key requirement in developing oxygen evolution reaction (OER) electrocatalysts is increasing their surface area. Herein, we report the design of a hierarchical micro/nanostructured catalyst. Based on polystyrene colloidal template electrodeposition, an ordered microcup array surrounded by nanoflakes was fabricated. The effect of the deposition time on the formation of the catalyst and the corresponding OER performance of the catalyst were investigated using scanning electron microscopy, in situ X-ray absorption fine structure (XAFS) spectroscopy, and electrochemical analysis. The in situ XAFS measurements indicate that the structure of the hierarchical structured catalyst is similar to that of γ-FeOOH. The electrochemical analysis indicates that the hierarchical catalyst has a large surface area and a low charge transfer resistance, which lead to its excellent catalytic performance for the OER. Our study provides new insights in designing high-performance OER catalysts. Moreover, the synthesized hierarchical micro/nanostructured catalyst could be used as a platform for further studies on low-cost iron-based electrocatalysts.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalAnalytical Sciences
Volume36
Issue number1
DOIs
Publication statusPublished - 2020

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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