异质结
催化作用
氨生产
产量(工程)
可逆氢电极
纳米技术
氨
材料科学
化学工程
光催化
化学
电化学
电极
光电子学
工作电极
有机化学
工程类
物理化学
冶金
作者
Demei Zhang,Shiyu Yang,Xiaoyu Fang,Huifeng Li,Xuebo Chen,Dongpeng Yan
标识
DOI:10.1016/j.cclet.2022.02.001
摘要
The existing industrial ammonia synthesis usually adopts the Haber-Bosch process, which requires harsh conditions of high temperature and high pressure, and consumes high energy. Under this circumstance, photoelectrochemical (PEC) catalysis is regarded as a promising method for N2 reduction reaction (NRR), but bears problems of low efficiency and yield. Thus, exploring active catalysts remains highly desirable. In this work, BiVO4@MXene hybrids have been facilely synthesized by a hydrothermal route. The heterojunctions by the in situ growth of BiVO4 onto two-dimensional (2D) MXene greatly increase the NRR efficiency: under photoelectric conditions, the optimized NH3 yield is 27.25 µg h − 1 cm−2, and the Faraday efficiency achieves 17.54% at −0.8 V relative to the reversible hydrogen electrode (RHE), which are higher than most state-of-the-art NRR (photo) electrocatalysts. The mechanism speculation shows the enhanced light absorption range and the heterojunction formation largely promote the separation and the transfer efficiency of photogenerated carriers, thereby improving the PEC catalytic ability. Therefore, this work provides a hybrid route to combine the advantages of photo and electric catalysis for effective artificial nitrogen fixation.
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