Photocatalytic water oxidation over BiVO_4 with interface energetics engineered by Co and Ni-metallated dicyanamides

作     者：Yi Shang Fujun Niu Shaohua Shen 尚义;牛富军;沈少华

作者机构：International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049 Shaanxi China 

出 版 物：《Chinese Journal of Catalysis》 (催化学报（英文）)

年 卷 期：2018年第39卷第3期

页      面：502-509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] 

基　　金：supported by the National Natural Science Foundation of China (51672210  51323011  51236007)~~ 

主　　题：Metal complex BiVO4 Water oxidation Photocatalysis Interfacial kinetics 

摘      要：Photocatalytic water oxidation based on semiconductors usually suffers from poor charge transfer from the bulk to the interface,which is necessary for oxygen ***,we construct a hybrid artificial photosynthesis system for photocatalytic water *** system consists of BiVO4as the light harvester,a transitional metal complex(M(dca)2,M=Co,Ni,dca:dicyanamide)as the water oxidation catalyst,and S2O82?as a sacrificial electron *** system exhibits enhanced oxygen evolution activity when M(dca)2is *** BiVO4/Co(dca)2and Bi‐VO4/Ni(dca)2systems exhibit excellent oxygen evolution rates of508.1and297.7μmol/(h·g)compared to the pure BiVO4which shows a photocatalytic oxygen evolution rate of252.2μmol/(h·g)during6h of photocatalytic ***(dca)2is found to be more effective than Ni(dca)2as a water oxidation *** enhanced photocatalytic performance is ascribed to the M(dca)2‐engineered BiVO4/electrolyte interface energetics,and to the M(dca)2‐catalyzed surface water *** two factors lead to a decrease in the energy barrier for hole transfer from the bulk to the surface of BiVO4,which promotes the water oxidation kinetics.