Nanoscale Assembly of BiVO4/CdS/CoOx Core–Shell Heterojunction for Enhanced Photoelectrochemical Water Splitting

Catalysts

Mareike Haensch¹  Christian Heinemann¹  Patrik Schmuki²  Štěpán Kment²  Hana Kmentova²  Radek Zbořil²  Olivier Henrotte²  Rambabu Yalavarthi²  Alberto Naldoni² 

[1] HEKA Elektronik GmbH, Wiesenstrasse 55, 67466 Lambrecht, Germany;Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacky University Olomouc, Křížkovského 511/8, 779 00 Olomouc, Czech Republic;

关键词: photoelectrocatalysis;    water splitting;    BiVO₄;    clean energy;    visible light;   

DOI  :  10.3390/catal11060682

来源: DOAJ

【 摘 要 】

Porous BiVO₄ electrodes were conformally decorated with CdS via a chemical bath deposition process. The highest photocurrent at 1.1 V vs. RHE was achieved for a BiVO₄/CdS composite (4.54 mA cm⁻²), compared with CdS (1.19 mA cm⁻²) and bare BiVO₄ (2.1 mA cm⁻²), under AM 1.5G illumination. This improvement in the photoefficiency can be ascribed to both the enhanced optical absorption properties and the charge separation due to the heterojunction formation between BiVO₄ and CdS. Furthermore, the BiVO₄/CdS photoanode was protected with a CoO_x layer to substantially increase the photostability of the material. The new BiVO₄/CdS/CoO_x nanostructure exhibited a highly stable photocurrent density of ~5 mA cm⁻². The capability to produce O₂ was locally investigated by scanning photoelectrochemical microscope, which showed a good agreement between photocurrent and O₂ reduction current maps. This work develops an efficient route to improve the photo-electrochemical performance of BiVO₄ and its long-term stability.

【 授权许可】

Unknown