分解水
过电位
塔菲尔方程
析氧
催化作用
双功能
光催化
材料科学
阳极
阴极
电化学
电解
电极
化学
化学工程
纳米技术
物理化学
生物化学
电解质
工程类
作者
Na Zhang,Qing Zhang,Xu Chen,Yang Li,Jian‐Yong Zhang,Liang Wu,Yufeng Liu,Yongzheng Fang,Zhifu Liu
标识
DOI:10.1016/j.cej.2021.131192
摘要
Herein, the flexible self-supported Cu2[email protected]2O3@carbon cloth electrode (named as Cu2[email protected]2O3@CC) has been synthesized by a facile and scalable thermal method. This Cu2[email protected]2O3@CC-500 hierarchical assembly needs ultralow overpotential of 296 mV (for oxygen evolution reaction, OER) and 188 mV (for hydrogen evolution reaction, HER) to afford the 10 mA cm−2 current density, and with the Tafel slope of 66 mV dec−1 (for OER) and 59 mV dec−1 (for HER) in alkaline medium (1.0 M KOH), respectively. The assembled water electrolyzer using bifunctional Cu2[email protected]2O3@CC-500 as both anode and cathode exhibited high stability with a cell voltage of only 1.675 V at 10 mA cm−2. More interestingly, this composite also exhibited excellent photocatalytic performance in CO2 reduction. For the Cu2[email protected]2O3@CC-500, the CO yield attained 172.2 µmol·gcatalyst−1·h−1 under visible light irradiation. Based on the measurements and density functional theory (DFT) calculation, an enhanced OER kinetics and a plausible mechanism for CO2 photo-reduction have been proposed. Our study will open a special door to provide multifunctional phtoelectrocatalyst to be widely used in the clean energy field.
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