The Construction of p/n-Cu2O Heterojunction Catalysts for Efficient CO2 Photoelectric Reduction

Author:

Zhou Qianqian123,Chen Yanxin12345ORCID,Shi Haoyan235,Chen Rui23,Ji Minghao23,Li Kexian23,Wang Hailong235,Jiang Xia23,Lu Canzhong12345

Affiliation:

1. College of Chemical Engineering, Fuzhou University, Fuzhou 350108, China

2. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China

3. Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen 361021, China

4. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China

5. Fujian College, University of Chinese Academy of Sciences, Fuzhou 350108, China

Abstract

Cu2O is a p-type direct bandgap semiconductor with a band gap of 2~2.2 eV, which has excellent visible light absorption and utilization. However, slow charge transfer and poor stability hinder its practical application. In this paper, a facile electrodeposition approach successfully synthesized the heterostructure of p-Cu2O and n-Cu2O. The protective layer of n-Cu2O on the surface of p-Cu2O nanoparticles forms a p/n heterojunction. Due to the p/n heterojunction, the PEC performance of p/n-Cu2O is enhanced significantly. The charge separation efficiency of photogenerated electron/hole pairs in p/n-Cu2O is greatly improved. Therefore, p/n-Cu2O shows superior photoelectrochemical (PEC) CO2 reduction reaction (CO2RR) efficiency when used as a photocathode.

Funder

Youth Innovation Foundation of Xiamen City

Strategic Priority Research Program of the Chinese Academy of Sciences

National Natural Science Foundation of China

Major Research Project of Xiamen

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

Natural Science Foundation of Fujian Province

Key Program of Frontier Science, CAS

Publisher

MDPI AG

Subject

Physical and Theoretical Chemistry,Catalysis,General Environmental Science

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