Photoanode Development Through Combinatorial Integration of mixed-metal Oxide Catalysts on Bismuth vanadate
Guevarra, D. et al. Development of solar fuels photoanodes through combinatorial integration of Ni–La–Co–Ce oxide catalysts on BiVO4. Energy & Environmental Science, DOI: 10.1039/C5EE03488D (2015).
Multi-metal compositions of (Ni-La-Co-Ce)Ox oxygen evolution reaction (OER) catalyst coatings improve the photoelectrochemical power conversion efficiency 20-fold compared to bare photoanode material, such as bismuth vanadate(BiVO4).
Significance & impact
This study shows that high-throughput characterization can enable identification of metal oxide compositions whose performance in integrated photoanodes greatly exceeds predictions, indicating improved interfaces.
Discrete (Ni-La-Co-Ce)Ox coatings were synthesized on a uniform BiVO4 thin film yielding 858 catalyst/BiVO4 assemblies with 3 different catalyst loadings.
- Catalysts that enhance pH 13 OER activity were identified via high-throughput photoelectrochemical screening and verified by traditional characterization of scaled-up La0.2Co0.2Ce0.6Ox/BiVO4 photoelectrodes.
- Compositions exceeding predicted performance, suggesting improved interfaces, are shown in yellow. Compositions that were underperforming are shown in purple, suggesting presence of degraded interfaces.