文献类型：期刊文献

英文题名：Schottky junction enhanced H2 evolution for graphitic carbon nitride-NiS composite photocatalysts

作者：Yue, Wenhui[1];Xu, Zehong[1];Tayyab, Muhammad[1];Wang, Lingzhi[1];Ye, Ziwei[1];Zhang, Jinlong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai Engn Res Ctr Multimedia Environm Catalysi, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：657

起止页码：133

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20234915159833);WOS:【SCI-EXPANDED(收录号:WOS:001130072300001)】；

基金：This work was supported by National Key Research and Development Program of China (2022YFB3803600, 2022YFE0107900) , the National Natural Science Foundation of China (21972040) , Innovation Program of Shanghai Municipal Education Commission (2021-01-07-00-02-E00106) , the Science and Technology Commission of Shanghai Municipality (22230780200, 20DZ2250400) , Shanghai Post-doctoral Excellence Program (2021111) and Fundamental Research Funds for the Central Universities (222201717003).

语种：英文

外文关键词：H 2 evolution; Graphitic carbon nitride nanotubes; NiS nanoparticles; Schottky junction

摘要：As one of the most promising photocatalysts for H2 evolution, graphitic carbon nitride (CN) has many appealing attributes. However, the activity of pristine CN remains unsatisfactory due to severe charge carrier recombination and lack of active sites. In this study, we report a two-step approach for the synthesis of CN nanotubes (TCN) loaded with NiS nanoparticles. The resulting composite photocatalysts gave a H2 evolution rate of 752.9 mu mol g- 1 h- 1, which is 42.3 times higher compared to the pristine CN photocatalyst. Experimental and simulation results showed that the Schottky junction which was formed between TCN and NiS was key to achieving high activity. This is because the formation of Schottky junction prevented the backflow of electrons from NiS to TCN, which improved charge separation efficiency. More importantly, it also led to the accumulation of electrons on NiS, which significantly weakened the S-H bond, such that the intermediate hydrogen species desorbed more easily from NiS surface to promote H2 evolution activity.