电催化剂
双功能
析氧
分解水
材料科学
兴奋剂
溶解
电极
化学
催化作用
化学工程
电化学
光电子学
物理化学
生物化学
光催化
工程类
作者
Bowen Wang,Xiangxiong Chen,Yingjian He,Qin Liu,Xinxin Zhang,Ziyu Luo,J. Kennedy,Junhua Li,Dong Qian,Jinlong Liu,Geoffrey I. N. Waterhouse
标识
DOI:10.1016/j.apcatb.2024.123741
摘要
Phosphorization of molybdates has been shown to promote hydrogen evolution reaction (HER) activity but is usually detrimental to oxygen evolution reaction (OER) activity, frustrating efforts to create bifunctional HER/OER electrocatalysts. Herein, we show that Fe2O3-modulated P-doped CoMoO4 on nickel foam (Fe-P-CMO) is an excellent bifunctional HER/OER electrocatalyst in alkaline media, with the adverse effect of phosphorization on the OER activity of CoMoO4 being countered via Fe2O3 introduction. An alkaline splitting electrolyser assembled directly using the self-supporting Fe-P-CMO electrode possessed outstanding long-term durability with ultralow cell voltages of 1.48 and 1.59 V required to achieve current densities of 10 and 100 mA cm−2, respectively. Detailed experimental investigations showed that during HER, P-doped CoMoO4 in Fe-P-CMO underwent surface reconstruction with the in-situ formation of Co(OH)2 on the P-CoMoO4 (Co(OH)2/P-CoMoO4). During OER, P-doped CoMoO4 was deeply reconstructed to CoOOH with the complete dissolution of Mo, leading to the in-situ formation of Fe2O3/CoOOH heterojunctions.
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