Load CoOx cocatalyst on photoanode by spin coating and calcination for enhanced photoelectrochemical water oxidation: A case study on BiVO4

• Published in: Journal of solid state chemistry 2021-07, Vol.299, p.122154, Article 122154
• Main Authors: Huang, Jingwei, Tian, Yue, Wang, Yani, Liu, Tingting
• Format: Article
• Language: English
• Subjects: BiVO4; Charge injection efficiency; Charge separation efficiency; CoOx; Photoelectrochemical water oxidation
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2021.122154

Water oxidation reaction is the rate-limiting step of the water splitting reaction. Loading water oxidation cocatalyst can effectively improve water oxidation performance. It is challenging to efficiently load water oxidation cocatalyst on photoanodes for photoelectrochemical water oxidation. In this work, CoOx was loaded on BiVO4 by a facile spin coating and calcination method. The photocurrent of the as-prepared CoOx/BiVO4 photoanode reached 2.73 ​mA/cm2 at 1.23 ​V vs RHE, which is comparable to that of CoOx/BiVO4 photoanode prepared using other methods. The H2 and O2 production reach 130.8 and 61.9 ​μmol respectively in 3 ​h test. All experiment results show that the improved photocurrent could be ascribed to enhanced charge separation efficiency and charge injection efficiency. CoOx nanoparticles was loaded on BiVO4 photoanode by a facile spin coating and calcination method. The obtained CoOx/BiVO4 photoanode shows a photocurrent of 2.73 ​mA/cm2 at 1.23 ​V vs RHE, which is comparable to that of CoOx/BiVO4 photoanode prepared using other methods. [Display omitted] •CoOx is loaded on BiVO4 by a facile spin coating and calcination method.•CoOx enhances the charge separation and injection efficiency of BiVO4.•CoOx/BiVO4 shows high photocurrent and stability.