Cobalt Phosphate Cocatalyst Loaded-CdS Nanorod Photoanode with Well-Defined Junctions for Highly Efficient Photoelectrochemical Water Splitting

Autor:	Azhu Wang, Song Sun, Yi Fan, Shikuo Li, Yusheng Zeng, Yuxue Wei, Xiaodi Zhu, Qin Cheng, Zhimin Song, Mengdie Cai
Rok vydání:	2020
Předmět:	Photocurrent 010405 organic chemistry Chemistry business.industry General Chemistry Activation energy 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Semiconductor Chemical engineering Photocatalysis Reversible hydrogen electrode Water splitting Nanorod business Cobalt phosphate
Zdroj:	Catalysis Letters. 150:1878-1889
ISSN:	1572-879X 1011-372X
DOI:	10.1007/s10562-019-03084-z
Popis:	Cocatalysts play important roles in photocatalytic and photoelectrochemical water splitting reactions. However, the formation of well-defined junctions between low dimensional semiconductors and cocatalysts is still challenging. In this study, CdS nanorod photoanodes loaded with cobalt phosphate (CoPi) cocatalyst were synthesized by a facile two-step route, in which CdS nanorods were prepared using a hydrothermal method followed by photo-assisted electrodeposition of CoPi. It was found that the formation of intimate junctions between CoPi and CdS nanorods in the form of Co–S bonding effectively facilitated the charge separation and lowered the activation energy of the water oxidation reaction. This resulted in highly efficient and stable photoelectrochemical water splitting on the CdS photoanode. The optimal CdS/CoPi photoanode showed a maximum photocurrent of 4.7 mA/cm2 at 0 V versus reversible hydrogen electrode under an AM 1.5 G solar simulator, which was 5.5-fold higher than that of bare CdS photoanode. This work expands the potential application of the cocatalyst CoPi in CdS photoanode systems and improves our understanding of the nature of cocatalysts with well-defined interface junctions in semiconductors. Well-defined interfacial junction with Co–S bonding over cobalt phosphate cocatalyzed CdS nanorod photoanode facilitates the charge separation and lowers the activation energy, thus achieving a considerable photocurrent of 4.7 mA/cm2 at 0 V vs. RHE.
Databáze:	OpenAIRE
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