Co_(3)O_(4)/stainless steel catalyst with synergistic effect of oxygen vacancies and phosphorus doping for overall water splitting

作     者：Xiao-Xiao Li Xiao-Chao Liu Chao Liu Jin-Ming Zeng Xiao-Peng Qi 

作者机构：College of Rare EarthJiangxi University of Science and TechnologyGanzhou 341000China Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China 

出 版 物：《Tungsten》 (钨科技（英文）)

年 卷 期：2023年第5卷第1期

页      面：100-108页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (22065015) Key Research Program of Jiangxi Province of China (20202BBEL53023) the Natural Science Foundation of Jiangxi Province (Grant Nos. 20212BAB203015 and 20212BCJL23053)。 

主　　题：Oxygen vacancy Phosphorus doping P-Ov-Co_(3)O_(4)/SS Overall water splitting 

摘      要：The electrolysis of water into hydrogen and oxygen provides an effective means of storing electrical energy indirectly.The current challenge is to design an optimal catalyst that exhibits low overpotentials,long-term stability,universal availability,and only uses inexpensive materials.Herein,a Co3O4nanoflower/stainless steel(P-Ov-CO_(3)O_(4)/SS) catalyst with both oxygen vacancies(Ovs) and phosphorus doping was perfectly prepared via a simple three-step method.The Ovs promoted charge transfer and accelerated the electrocatalysis,while P finely tuned the surface charge state.This resulted in numerous active sites for catalysis,and the synergistic effect of phosphorus doping and oxygen vacancies was finely demonstrated.The resultant electrocatalyst exhibited low hydrogen evolution overpotentials of 118 mV(-10 mA·cm^(-2)) and 242(-200 mA·cm^(-2)),as well as oxygen evolution overpotentials of 327 mV(100 mA·cm^(-2)) and 370 mV(200 mA·cm^(-2)),owing to the excellent synergistic effect of the Ovs and low-temperature phosphating.Moreover,P-Ov-Co_(3)O_(4)/SS//P-Ov-Co_(3)O_(4)/SS exhibited a low water splitting voltage of 1.681 V at 20 mA.cm-2.These findings will enable the synthesis of novel high-performance electrocatalysts for overall water splitting.