In this study, we demonstrate a novel and scalable route to CoPi, where cobalt oxide (CoOx) is first grown by aerosol-assisted chemical vapour deposition (AACVD) and then surface modified through a dark electrochemical treatment (ET) process. CoPi was grown onto bismuth vanadate (BiVO4) photoanodes, also synthesised by AACVD. CoPi-decorated BiVO4 demonstrated high charge separation efficiency (84%), stability over four hours of chronoamperometry (~90% of initial performance retained), and photoelectrochemical performance, achieving a half-cell solar-to-hydrogen (HC-STH) efficiency of 1.16% at 1.23 V vs RHE. Overall, our study demonstrates the viability of the AACVD technique to produce scalable photoanodes for solar water splitting applications.
- Mengyuan Huang
- George Creasey
- Andreas Kafizas