论文类型：Research Article
第一作者：Liu,Jianyun
通讯作者：Wang,Tanyuan,Li,Qing
合写作者：Wang,Guoxiong,Huang,Yunhui,Han,Jiantao,Cai,Zhao,Xie,Linfeng,Li,Shenzhou,Shi,Hao,Liu,Xuan
发表刊物：ACS Catalysis
所属单位：华中科技大学
刊物所在地：美国
文献类型：Article
卷号：13
期号：8
页面范围：5194-5204
关键字：Acidic Water Oxidation; Electrocatalysts Oxygen Evolution Reaction; Cobalt Oxide; In Situ Reconstruction
DOI码：10.1021/acscatal.2c06133
发表时间：2023-03-30
影响因子：11.3
摘要：Developing efficient and durable earth-abundant electrocatalysts for the acidic oxygen evolution reaction (OER) is the bottleneck for water splitting using proton-exchange membrane electrolyzers. Herein, a heterostructured CeO2 nanorod-supported Co–Ni–P oxide (CeO2/Co-Ni–P–Ox) catalyst is prepared for acidic OER electrocatalysis and the valence states of Co is precisely tuned from 2 to 2.51 by introducing heterojunction interfaces and trace P atoms. The increased Co states favor the in situ transformation of surface Co2+–O sites into highly active reducible Co3+–O sites, which promotes the deprotonation of water molecules and accelerates the OER kinetics. Therefore, this catalyst exhibits extraordinarily low OER overpotentials of 166 and 262 mV at 5 and 10 mA cm–2, respectively, in 0.5 M H2SO4, which are among the best reported for precious-metal-free electrocatalysts so far. The stability of the catalyst is also greatly improved due to the increased vacancy formation energy of the Co site that restricts its dissolution in an acid.