Construction of 2D/2D Z-scheme MnO2-x/g-C3N4 photocatalyst for efficient nitrogen fixation to ammonia

• 作者: Limin Yu Zhao Mo Xianglin Zhu Jiujun Deng Fan Xu Yanhua Song Yuanbin She Huaming Li Hui Xu
• 来源期刊: 绿色能源与环境（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Research papers
• 页码范围: 538-545
• 页数: 8页
• 语种: 英文

摘要

Reducing nitrogen to ammonia with solar energy has become a wide concern when it comes to photocatalysis research.It is considered to be one of the more promising alternate options for the conventional Haber-Bosch cycle.Herein,2D g-C3N4 composites with modifying ultrathin sheet MnO2-x were prepared and used as nitrogen fixation photocatalyst.With the assistance of the nature of MnO2-x,the generation rate of NH3 reached 225 μmol g-1 h-1,which is more than twice over the rate of pristine 2D g-C3N4 (107 μmol g-1 h-1).The presence of ultrathin sheet MnO2-x shortens the gap of the carriers to the surface of photocatalyst.Thus the speed of electron transfer gets increased.Besides,the con-struction of Z-scheme heterojunction boosts the separation and migration of photogenerated carriers.As a result,the nitrogen reduction reaction(NRR) performance gets enhanced.The work may provide an example of promoting the NRR performance of non-metallic compound.