We present a novel solution-based synthesis method enabling the morphology variation of Sb 2 Se 3 light absorbers. The morphology of Sb 2 Se 3 films varies from dense particulate planar films to one-dimensional nanowire-stacked films upon modulating the Sb and Se molar ratio in the precursor ink. The effect of morphology and crystallographic orientation on the electrical and consequently the PEC properties of Sb 2 Se 3 -based photocathodes is investigated. Sequential deposition of CdS as a buffer layer with TiO 2 and Pt enables us to build a favorable band structure. An onset potential of 0.47 V versus a reversible hydrogen electrode (RHE) is observed with 13.5 mA cm -2 at 0 V versus a RHE under air mass 1.5 global illumination in a pH 1 electrolyte. In addition, the surface-modified photocathode stably produces hydrogen with a photocurrent of 11 mA cm -2 at 0 V versus RHE in a neutral electrolyte, thus demonstrating the promising potential of the proposed Sb 2 Se 3 photocathodes as efficient PEC water-splitting devices.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (NRF) of Korea grant (No. 2012R1A3A2026417) funded by the Ministry of Science and ICT.
© 2019 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Chemistry (miscellaneous)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Materials Chemistry