Regulating crystal structure and atomic arrangement in single-component metal oxides through electrochemical conversion for efficient overall water splitting
學年 109
學期 1
出版（發表）日期 2020-12-23
作品名稱 Regulating crystal structure and atomic arrangement in single-component metal oxides through electrochemical conversion for efficient overall water splitting
作品名稱（其他語言）
著者 X. Zhang; C. L. Dong; Y. Wang; J. Chen; K. T. Arul; Z. Diao; Y. Fu; M. Li; S. Shen
單位
出版者
著錄名稱、卷期、頁數 ACS Applied Materials & Interfaces 12(51), p.57038-57046
摘要 Single-component transition-metal oxide (TMO: FeOx, NiOx, or CoOx) nanosheets grown on nickel foam (NF) were electrochemically optimized with Li ion (Na ion)-induced conversion reaction for bifunctional electrocatalysis. The optimum FeOx/NF-Li electrocatalyst exhibits low overpotentials of 239 mV for hydrogen evolution reaction and 276 mV for oxygen evolution reaction at a current density of 100 mA cm–2. A two-electrode water splitting cell using FeOx/NF-Li as both anode and cathode requires only 1.60 V to achieve a current density of 10 mA cm–2. The impressive water splitting performance of the FeOx/NF-Li electrode is revealed to be attributed to Li-induced electrochemical conversion, which alters the crystal structure, creating more active sites for electrocatalytic reactions, as well as introduces O vacancies increasing the electron density and the intrinsic conductivity. More importantly, the atomic arrangement is regulated from tetrahedral Fe(Td) to octahedral Fe(Oh) coordination, which acts as catalytically active sites with reduced Gibbs free energy for the rate-determining steps. This electrochemical conversion reaction can be extended to other TMOs (i.e., NiOx/NF and CoOx/NF) for promoted electrocatalytic water splitting performances. This study provides an in-depth understanding on the nature of atomic and electronic structure evolution to promote the electrocatalytic activity.
關鍵字 water splitting;bifunctional electrocatalyst;transition metal oxides;electrochemical conversion reaction;crystal structure;atomic arrangement
語言 en_US
ISSN 1944-8252
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
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