Constructing Crystalline g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x)Isotype Heterostructure for Efficient Photocatalytic and Piezocatalytic Performances  

作　　者：Tingting Xu Zhonghui Xia Hongguan Li Ping Niu Shulan Wang Li Li 

机构地区：[1]Department of Chemistry,School of Science,Northeastern University,Shenyang 110819,China [2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China [3]School of Metallurgy,Northeastern University,Shenyang 110819,China

出　　处：《Energy & Environmental Materials》2023年第2期8-16,共9页能源与环境材料（英文）

基　　金：supported by the National Natural Science Foundation of China(51902045,51904059);Fundamental Research Funds for the Central Universities(N182503030,N182505036,N2002005);Liao Ning Revitalization Talents Program(XLYC1807123);Young Elite Scientist Sponsorship Program by CAST(YESS)2019-2021QNRC.

摘　　要：Graphitic carbon nitride(g-C_(3)N_(4))is viewed as a promising visible-light photocatalyst for industrialization due to its low processing temperature and high chemical stability.However,serious charge recombination caused by incomplete polymerization during direct calcination of nitrogen-rich precursors significantly limits its photocatalytic performances.To boost charge separation,herein,we propose a rational strategy by constructing a crystalline g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x) isotype heterostructure through the molten salt method.Theoretical calculation reveals that apparent charge-transfer channels are formed between g-C_(3)N_(4) and S-doped g-C_(3)N_(4) layers in the heterostructure.Owing to high crystallinity for decreasing charge recombination and isotype heterostructure for efficient charge transfer,the as-prepared g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x) showed remarkable photocatalytic performances with the hydrogen production rate elevated by up to 12.3 times of its singular components.Another novelty of this work is we investigated for the first time the piezocatalytic activity of crystalline g-C_(3)N_(4) by characterizing its performance for H2O2 generation and KMnO4 reduction.Strikingly,its superior piezocatalytic performance over components can be further improved by NaBH4 treatment,which is uncovered to enhance the asymmetric structure of crystalline g-C_(3)N_(4) by introducing extra cyano groups and removing partial NHx species in its tri-s-triazine layer structure.This work opens up new strategies for the design of highly efficient polymeric photocatalysts and highlights the piezocatalytic studies of g-C_(3)N_(4).

关 键 词：carbon nitride high crystallinity isotype heterostructure photocatalysis piezoelectric catalysis 

分 类 号：TQ113.26[化学工程—无机化工] TQ426