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A two‐dimensional BiOI/MoS2heterojunction is fabricated by in situ growth of MoS2on BiOI nanosheets through a hydrothermal method and then as a carrier for loading on Pt nanoparticles. Transmission electron microscopy shows that Pt nanoparticles are decorated uniformly on the surface of BiOI/MoS2nanosheets. The obtained Pt‐BiOI/MoS2is utilized as an electrocatalyst for the methanol oxidation reaction in alkaline conditions under visible light irradiation. Electrochemical evaluations indicate that as‐prepared Pt‐BiOI/MoS2expresses the highest methanol oxidation reaction activity and stability, and the maximum current density reaches 1007.2 mA mg−1Ptunder visible light irradiation, which is 12 and 3.5 times higher compared with Pt‐BiOI and commercial Pt/C electrodes, respectively, in the traditional electrocatalytic process. The results suggest that a synergy of photo‐ and electro‐processes improves the photoelectrocatalytic performance of Pt‐BiOI/MoS2in the methanol oxidation reaction. The synergistic effects of the electro‐ and photo‐catalytic methanol oxidation reaction (MOR) of Pt‐BiOI/MoS2contribute to enhanced catalytic MOR performance. The photoelectrocatalytic performance of the Pt‐BiOI/MoS2electrode is 4.5 times higher than the same electrode in traditional electrochemical methods.

Ethylene glycol oxidation reaction (EGOR) is a key anode reaction in direct ethylene glycol fuel cells (DEGFCs). Herein, 2D semiconductor bismuth tungstate (Bi2WO6) nanosheets are facilely prepared and used as carriers for the deposition of platinum nanoparticles (Pt NPs). The resultant material is used as the working electrode in the application of DEGFCs. Due to the excellent absorption property of Bi2WO6in visible light, the optimized Pt‐Bi2WO6electrode (Pt at 20 wt%) shows improved catalytic activity and stability with visible‐light illumination. The current density using the Pt‐Bi2WO6electrode reaches 492.5 mA mg−1Ptwith visible‐light irradiation, which is about 4.2 fold higher in comparison with the same electrode in dark conditions. This 2D sheet‐like support, together with the visible‐light response of Bi2WO6, induces the deposition of ultra‐small sizes of Pt (5.4 nm) and the synergistic effect of electrocatalytic and photocatalytic ethylene glycol oxidation, thus greatly improving the photoelectric catalytic property of EGOR. A synergistic effect of the electrocatalytic and photocatalytic reaction is found using 2D Bi2WO6as the Pt carriers for improving ethylene glycol oxidation.