Regulating nitrogen vacancies within graphitic carbon nitride to boost photocatalytic hydrogen peroxide production

SusMat

article

Yanlin Zhu¹  Xuetao Liu¹  Heng Liu¹  Guangling He¹  Jiamin Xiao¹  Haijiao Xie²  Yanyan Sun³  Lei Han¹ 

[1] College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University;Hangzhou Yanqu Information Technology Co. Ltd.;School of Materials Science and Engineering, Central South University

关键词: carbon nitride;    hydrogen peroxide;    nitrogen vacancies;    oxygen absorption;   

DOI  :  10.1002/sus2.83

学科分类：电力

来源: Wiley

【 摘 要 】

Introducing nitrogen vacancies is an effective method to improve the catalytic performance of g-C 3 N 4 -based photocatalysts, whereas understanding how nitrogen vacancies types affect the catalytic performance remains unclear. Herein, two different types of nitrogen vacancies were successfully introduced into g-C 3 N 4  by pyrolysis of melamine under argon and ammonia atmosphere with subsequent HNO 3  oxidation. The pyrolysis atmosphere is found to have a significant influence on the introduced nitrogen vacancies type, where tertiary nitrogen groups (N 3 C) and sp 2 -hybridized nitrogen atoms (N 2 C) were the preferred sites for the formation of nitrogen vacancies under ammonia and argon pyrolysis, respectively. Moreover, nitrogen vacancies from N 3 C are experimentally and theoretically demonstrated to facilitate the narrowed band gap and the improved oxygen absorption capability. As expected, the optimal catalyst exhibits high H 2 O 2  yield of 451.8 µM, which is 3.8 times higher than the pristine g-C 3 N 4  (119.0 µM) after 4 h and good stability after10 photocatalytic runs.

【 授权许可】

CC BY