Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



A oxygen vacancy-modulated homojunction structural CuBi2O4 photocathodes for efficient solar water reduction

Author affiliations

Abstract

The photoelectrochemical (PEC) water reduction performance of CuBi2O4 (CBO)-based photocathodes is still far from their theoretical values due to low bulk and surface charge separation efficiencies. Herein, we propose a regrowth strategy to prepare a photocathode with CBO coating on Zn-doped CBO (CBO/Zn-CBO). Furthermore, NaBH4 treatment of CBO/Zn-CBO introduced oxygen vacancies (Ov) on CBO/Zn-CBO. It was found that Zn-doping not only increases the charge carrier concentration of CBO, but also leads to appropriate band alignment to form homojunctions. This homojunction can effectively promote the separation of electron–hole pairs, thus obtaining excellent photocurrent density (0.5 mA cm−2 at 0.3 V vs. RHE) and charge separation efficiency (1.5 times than CBO). The following surface treatment induced Ov on CBO/Zn-CBO, which significantly increased the active area of the surface catalytic reaction and further enhanced the photocurrent density (0.6 mA cm−2). In the absence of cocatalysts, the electron injection efficiency of Ov/CBO/Zn-CBO was 1.47 times improved than that of CBO. This work demonstrates a homojunction photocathode with Ov modulation, which provides a new view for future photoelectrochemical water splitting.

Graphical abstract: A oxygen vacancy-modulated homojunction structural CuBi2O4 photocathodes for efficient solar water reduction

Back to tab navigation

Supplementary files

Article information


Submitted
12 Jun 2020
Accepted
21 Jun 2020
First published
23 Jun 2020

Nanoscale, 2020, Advance Article
Article type
Paper

A oxygen vacancy-modulated homojunction structural CuBi2O4 photocathodes for efficient solar water reduction

S. Wei, C. Wang, X. Long, T. Wang, P. Wang, M. Zhang, S. Li, J. Ma, J. Jin and L. Wu, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR04473C

Social activity

Search articles by author

Spotlight

Advertisements