Abstract
Ti:CuSiO3 and Si:Cu3TiOx are identified as promising photocathode materials with improved stability and high photocurrent densities.
Highlights
Photoelectrochemical (PEC) water splitting[1] is the scienti c endeavor of absorbing sunlight using a semiconductor to drive an electrochemical reaction on its surface to obtain hydrogen as an energy carrier
Cu-containing photocathodes are generally limited by fast photocorrosion under working conditions. Stabilization of these materials is a key factor in their potential application for the light-induced hydrogen evolution reaction (HER)
The results revealed that compositions near Ti-doped CuSiO3 and Si-doped Cu3TiOx act as comparatively stable and highly active materials for HER
Summary
New materials for the light-induced hydrogen evolution reaction from the Cu–Si–Ti–O system†. Stein,a Ramona Gutkowski,b Alexander Siegel,a Wolfgang Schuhmann*bc and Alfred Ludwig*ac. Cu-containing photocathodes are generally limited by fast photocorrosion under working conditions. Stabilization of these materials is a key factor in their potential application for the light-induced hydrogen evolution reaction (HER). In order to identify new materials, oxidized Cu–Si–Ti metallic thin film precursor materials libraries were evaluated using a combinatorial approach. High-throughput photoelectrochemical characterization using an automated optical scanning droplet cell was performed on a material library to analyze doping and alloying effects on the light-induced HER. The results revealed that compositions near Ti-doped CuSiO3 (dioptase and copper-polysilicate) and Si-doped Cu3TiOx act as comparatively stable and highly active materials for HER
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