Photoelectrochemical study of p-GaP(100)|ZnO|AuNP devices: strategies for enhanced electron transfer and aqueous catalysis
We report a photocathode device consisting of GaP, a metal oxide (Al2O3 or ZnO), a phosphonate-C12-thiol monolayer, and gold nanoparticles (AuNPs). The AuNPs enhance electron transfer: in non-aqueous electrochemistry (EtV2+ in MeCN), p-GaP|Al2O3|O3PC12S|AuNP and …ZnO|…|AuNP rescued the photocurrent (24%, 59% of Jmax-etch). Aqueous experiments (CO2 saturated KCl) using the optimized ZnO-functionalized device exhibited H+ → H2 (FY = 66%) and CO2 → CO (FY = 6%).
- This article is part of the themed collection: 2016 Emerging Investigators