Spinel-covered interlayer MgO enhances the performance of BiVO4 photocatalytic ammonia synthesis

IF 20.2 1区 化学 Q1 CHEMISTRY, PHYSICAL
Kaiyi Chen , Rongling Wang , Qiong Mei , Fei Ding , Hui Liu , Guidong Yang , Bo Bai , Qizhao Wang
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引用次数: 0

Abstract

In order to respond to the call for low emissions and low energy consumption, photoelectrochemical (PEC) ammonia synthesis is used to replace the Haber-Bosch method of nitrogen reduction, and highly efficient photoelectrocatalysts were used to reduce the reaction energy barrier. In this paper, the interlayer MgO and base BiVO4 were successfully compounded by a simple electrodeposition method, and the spinel MCo2O4 (M=Zn, Mn) was compounded on MgO/BiVO4 by a hydrothermal method, forming a sandwich structure of MCo2O4/MgO/BiVO4 (M=Zn, Mn). The research shows that the sandwich structure constructed by MgO as the intermediate layer can reduce the excessive surface defects of photocatalyst, effectively reduce the recombination of photogenerated charge, promote the directional migration and separation of photogenerated charge, and improve the photocurrent density and photoelectric conversion efficiency. MCo2O4 (M=Zn, Mn) is a nitrogen reduction cocatalyst, which forms a heterojunction with n-type BiVO4 and inhibits the recombination of photogenerated electrons. The synergistic effect of MCo2O4(M=Zn, Mn) and MgO accelerates the surface charge transfer efficiency and enhances the photoelectricity ammonia synthesis efficiency. The PEC ammonia synthesis efficiency reached more than 30 µmol h−1 g−1cat, and the Faradaic efficiency(FE) is over 30%.

Abstract Image

尖晶石覆盖的层间氧化镁提高了 BiVO4 光催化合成氨的性能
为了响应低排放、低能耗的号召,光电化学(PEC)合成氨法被用来替代哈伯-博施(Haber-Bosch)还原法制氮,并采用高效光电催化剂来降低反应能垒。本文通过简单的电沉积方法成功复合了层间 MgO 和基底 BiVO4,并通过水热法在 MgO/BiVO4 上复合了尖晶石 MCo2O4(M=Zn、Mn),形成了 MCo2O4/MgO/BiVO4 (M=Zn、Mn)的三明治结构。研究表明,以 MgO 为中间层构建的三明治结构可以减少光催化剂过多的表面缺陷,有效降低光生电荷的重组,促进光生电荷的定向迁移和分离,提高光电流密度和光电转换效率。MCo2O4(M=Zn、Mn)是一种氮还原协同催化剂,它与 n 型 BiVO4 形成异质结,抑制光生电子的重组。MCo2O4(M=Zn、Mn)和 MgO 的协同作用加快了表面电荷转移效率,提高了光电氨合成效率。PEC 合成氨效率达到 30 µmol h-1 g-1cat 以上,法拉第效率(FE)超过 30%。
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来源期刊
Applied Catalysis B: Environmental
Applied Catalysis B: Environmental 环境科学-工程:化工
CiteScore
38.60
自引率
6.30%
发文量
1117
审稿时长
24 days
期刊介绍: Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.
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