Citation: Meiqin Shi, Wentian Zhang, Yingying Li, Youqun Chu, Chun'an Ma. Tungsten carbide-reduced graphene oxide intercalation compound as co-catalyst for methanol oxidation[J]. Chinese Journal of Catalysis, ;2016, 37(11): 1851-1859. doi: 10.1016/S1872-2067(16)62535-4 shu

Tungsten carbide-reduced graphene oxide intercalation compound as co-catalyst for methanol oxidation

State Key Laboratory Breeding Base of Green Chemistry‐Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China

Received Date: 8 June 2016
Revised Date: 25 August 2016

Fund Project: This work was supported by the International Science & Technology Cooperation Program of China (2010DFB63680)

Highly dispersed tungsten carbide (WC) nanoparticles (NPs) sandwiched between few-layer re-duced graphene oxide (RGO) have been successfully synthesized by using thiourea as an anchoring and inducing reagent. The metatungstate ion,[H₂W₁₂O₄₀]^6-, is assembled on thiourea-modified gra-phene oxide (GO) by an impregnation method. The WC NPs, with a mean diameter of 1.5 nm, are obtained through a process whereby ammonium metatungstate first turns to WS₂, which then forms an intercalation compound with RGO before growing, in situ, to WC NPs. The Pt/WC-RGO electro-catalysts are fabricated by a microwave-assisted method. The intimate contacts between Pt, WC, and RGO are confirmed by X-ray diffraction, scanning electron microscope, transmission electron microscope, and Raman spectroscopy. For methanol oxidation, the Pt/WC-RGO electrocatalyst ex-hibited an electrochemical surface area value of 246.1 m²/g Pt and a peak current density of 1364.7 mA/mg Pt, which are, respectively, 3.66 and 4.77 times greater than those of commercial Pt/C electrocatalyst (67.2 m²/g Pt, 286.0 mA/mg Pt). The excellent CO-poisoning resistance and long-term stability of the electrocatalyst are also evidenced by CO stripping, chronoamperometry, and accelerated durability testing. Because Pt/WC-RGO has higher catalytic activity compared with that of commercial Pt/C, as a result of its intercalated structure and synergistic effect, less Pt will be required for the same performance, which in turn will reduce the cost of the fuel cell. The present method is facile, efficient, and scalable for mass production of the nanomaterials.
- Tungsten carbide-reduced graphene oxide,
- Intercalation compound,
- Thiourea,
- Anchoring,
- Methanol oxidation
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