Abstract
Hydrogen production by solar energy is an efficient and clean approach to fulfill the future energy demand. Herein, a novel multi-shelled porous heterostructure CoOx/CdS/TiO2 photoanode was fabricated by the hydrothermal and chemical method. There were more active sites, suitable surface defects and heterojunction structures in the homogeneous-porous-multi-shelled CoOx/CdS/TiO2 photoanode. It showed a photocurrent density of 2.89 mA/cm2 at 1.23V vs. RHE, which is 2.22 fold of the original TiO2 photoanode. The heterostructure fabrication of the CdS/TiO2 could broaden the visible light absorption and enhance the charge separation efficiency. The multi-shelled homogeneous porous structure of the CoOx/CdS/TiO2 further enhanced the charge separation efficiency and accelerated the interfacial oxygen evolution kinetics. The mechanism for the enhanced photoelectrochemical water splitting of favorable CoOx/CdS/TiO2 photoanode is proposed.
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