The incorporation of cocatalyst cobalt sulfide into graphitic carbon nitride:Boosted photocatalytic hydrogen evolution performance and mechanism exploration  

作　　者：Zhangqian Liang Yanjun Xue Xinyu Wang Xiaoli Zhang Jian Tian Hongzhi Cui 

机构地区：[1]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao,266590,China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou,450001,China

出　　处：《Nano Materials Science》2023年第2期202-209,共8页纳米材料科学（英文版）

基　　金：funding from the National Natural Science Foundation of China(No.51872173 and 51772176);Taishan Scholar Foundation of Shandong Province(No.tsqn201812068 and tspd20161006);Youth Innovation Technology Project of Higher School in Shandong Province(No.2019KJA013);Science and Technology Special Project of Qingdao City(No.20-3-4-3-nsh);the Opening Fund of State Key Laboratory of Heavy Oil Processing(No.SKLOP202002006)。

摘　　要：2D-layered graphitic carbon nitride(g-C_(3)N_(4))is regarded as a great prospect as a photocatalyst for H_(2)generation.However,g-C_(3)N_(4)’s photocatalytic hydrogen evolution(HER)activity is significantly restricted by the recombination of photocarriers.We find that cobalt sulfide(CoS_(2))as a cocatalyst can promote g-C_(3)N_(4)nanosheets(NSs)to realize very efficient photocatalytic H_(2)generation.The prepared CoS_(2)/g-C_(3)N_(4)hybrids display highly boosted photocatalytic H_(2)generation performance and outstanding cycle stability.The optimized 7%-CoS_(2)/g-C_(3)N_(4)hybrids show a much improved photocatalytic H_(2)generation rate of 36.2μmol-1h-1,which is about 180 times as much as bare g-C_(3)N_(4)(0.2μmol-1h-1).In addition,the apparent quantum efficiency(AQE)of all the samples was computed under light atλ=370 nm,in which the AQE of 7%-CoS_(2)/g-C_(3)N_(4)hybrids is up to 5.72%.The experimental data and the DFT calculation suggest that the CoS_(2)/g-C_(3)N_(4)hybrid’s excellent HER activity is attributable to the lower overpotential and the smaller Co-H bond activation energy for HER.Accordingly,the CoS_(2)cocatalyst loading effectively boosts the photocatalytic performance of g-C_(3)N_(4)for H_(2)evolution.The project promotes fast development of high-efficiency photocatalysts and low-cost for photocatalytic H_(2)generation.

关 键 词：Non-precious-metal cocatalysts Photocatalytic hydrogen evolution reaction CoS_(2)cocatalysts 2D-layered g-C_(3)N_(4) 

分 类 号：TQ116.2[化学工程—无机化工] TQ426