Nanocrystalline tungstic carbide/graphitic carbon composite: synthesis,characterization, and its application as an effective Pt catalyst support for methanol oxidation |
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Authors: | Liming Jiang Honggang Fu Lei Wang Guang Mu Baojiang Jiang Wei Zhou Ruihong Wang |
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Institution: | 1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China 2. Key Laboratory of Functional Inorganic Material Chemistry, Heilongjiang University, Harbin, 150080, People’s Republic of China
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Abstract: | Tungsten carbide and graphitic carbon (WC/GC) composite has been synthesized by a simple solid-state pyrolysis method from an in situ route. The results indicate that the synthesized sample has a large specific surface area (S BET) of 198 m2 g?1, and the WC nanoparticles (NPs) with a narrow particle size are well dispersed on the graphitic carbon. After loading Pt nanoparticles, the prepared Pt/WC/GC catalyst exhibits a mass activity of 416.1 mA mg?1 Pt toward methanol electrooxidation, which is much higher than that of commercial Pt/C (JM) (231.2 mA mg?1 Pt). Moreover, the onset potential is 100 mV more negative than that on Pt/C (JM) electrocatalyst. In addition, the Pt/WC/GC catalyst has stronger resistance to CO poisoning than the commercial Pt/C (JM). Its superior electrochemical performance could be attributed not only to the synergistic effect between Pt and WC NPs but also to the excellent electrical conductivity of GC and proper porous structure for desirable mass transportation in a porous electrode. |
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