Zhang Jun-Ye, Wang Hongming, Tian Yifan, Yan Ya, Xue Qi, He Ting, Liu Hongfang, Wang Chundong, Chen Yu, Xia Bao Yu
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, P. R. China.
Institute for Advanced Study, Nanchang University, 999 Xuefu Road, Nanchang, P. R. China.
Angew Chem Int Ed Engl. 2018 Jun 25;57(26):7649-7653. doi: 10.1002/anie.201803543. Epub 2018 May 23.
Water electrolysis is a promising source of hydrogen; however, technological challenges remain. Intensive efforts have focused on developing highly efficient and earth-abundant electrocatalysts for water splitting. An effective strategy is proposed, using a bifunctional tubular cobalt perselenide nanosheet electrode, in which the sluggish oxygen evolution reaction is substituted with anodic hydrazine oxidation so as to assist energy-efficient hydrogen production. Specifically, this electrode produces a current density of 10 mA cm at -84 mV for hydrogen evolution and -17 mV for hydrazine oxidation in 1.0 m KOH and 0.5 m hydrazine electrolyte. An ultralow cell voltage of only 164 mV is required to generate a current density of 10 mA cm for 14 hours of stable water electrolysis.
水电解是一种很有前景的制氢方法；然而，技术挑战依然存在。大量的努力都集中在开发用于水分解的高效且储量丰富的电催化剂上。本文提出了一种有效的策略，即使用双功能管状钴硒化物纳米片电极，其中缓慢的析氧反应被阳极肼氧化所取代，以辅助高效制氢。具体而言，该电极在1.0 m KOH和0.5 m肼电解液中，析氢时在-84 mV下产生10 mA cm的电流密度，肼氧化时在-17 mV下产生相同电流密度。在稳定的水电解14小时过程中，仅需164 mV的超低电池电压就能产生10 mA cm的电流密度。
