材料科学
空位缺陷
异质结
光催化
氮气
载流子
共价键
固氮
吸附
电化学
光化学
纳米技术
结晶学
光电子学
物理化学
电极
有机化学
催化作用
化学
作者
Huan Shang,Xingyu Ye,Hongbao Jia,Qiong Zhu,Dieqing Zhang,Ding Wang,Guisheng Li
标识
DOI:10.1002/admt.202201579
摘要
Abstract Photocatalytic nitrogen fixation is a promising strategy for ammonia synthesis under mild conditions by using solar energy, but N 2 activation remains a great challenge. Herein, we demonstrate that a Z‐scheme g‐C 3 N 4 /WO 3 heterojunction possessing abundant nitrogen vacancies exhibits the highly enhanced activity for photocatalytic N 2 fixation through efficient nitrogen molecular activation compared with pristine NVs‐g‐C 3 N 4 and WO 3 photocatalysts. The construction of the internal electric field induced by Z‐scheme NVs‐g‐C 3 N 4 /WO 3 heterojunction allows a rapid charge carrier separation and simultaneously maintains the powerful redox ability of photogenerated charge carriers, defined by the covalent CO bond. Moreover, nitrogen vacancy plays a crucial role in the adsorption/activation of N 2 , which substantially facilitates the hydrogenation to generate NH 3 . According to experimental and theoretical investigations, photocatalytic N 2 fixation on NVs‐g‐C 3 N 4 /WO 3 composites is proposed to be energetically favorable in the alternating pathway. This study offers an alternative way for the design of efficient photocatalysts for photocatalytic N 2 fixation.
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