Abstract
High active and low expensive electrocatalysts for methanol oxidation reaction (MOR) still remain a signification challenge for large-scale commercial application of direct methanol fuel cells (DMFCs). Herein, the photoelectrocatalytic activity of cobalt sulfide (CoS) nanosheets are dramatically developed towards MOR by introduction of a photosensitive organic molecule (5, 10, 15, 20-tetrakis(4-achlorophenyl)porphyrin (TClPP). CoS/TClPP exhibits a high mass activity of 1188 mA mg−1 for MOR under visible light irradiation, which is 1.6 times higher than that of pure CoS under dark as well as 1.37 times higher than that of pure CoS under visible light. The photoelectrocatalytic mechanism of CoS/TClPP is ascribed to the effective inhibiting of recombination of photoelectrons and holes as well as acceleration of electron transfer, which are verified by photoluminescence (PL) emission spectra, photocurrent response curves and UV–vis diffuse reflectance spectra (DRS), respectively. The low cost, highly stable and active CoS/TClPP as a noble-metal-free anode photoelectrocatalyst has a potential application in DMFCs.
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