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利用改进的Hummers法制备氧化石墨烯(GO),采用静电纺丝和热处理结合的方法得到碳纳米纤维(CNFs),并将其混合作为催化剂载体。然后,以乙二醇为还原剂,采用一步微波法还原H_2PtCl_6的同时将GO还原为还原氧化石墨烯(rGO),得到Pt/CNFs-rGO复合催化剂。酸性条件下,用循环伏安法和计时安培法研究Pt/CNFs-rGO在甲醇电化学氧化中的催化性能。结果表明,与Pt/CNFs、Pt/rGO和商用Pt/C催化剂相比,复合催化剂Pt/CNFs-rGO对甲醇氧化有较高的催化性能,且mrGO∶mCNFs=4∶3时Pt/CNFs-rGO的催化效果最佳。碳纤维的引入可以提高Pt/rGO催化氧化甲醇的性能,其原因为CNFs的引入有效改善了石墨烯片层间的堆叠,从而提高了Pt粒子的利用率。
Graphene oxide (GO) was prepared by a modified Hummers method. Carbon nanofibers (CNFs) were obtained by a combination of electrospinning and heat treatment, and were mixed as a catalyst carrier. Then, the Pt / CNFs-rGO composite catalyst was obtained by reducing H 2 PtCl 6 with ethylene glycol as reductant and H 2 PtCl 6 by one-step microwave at the same time reducing GO to reductive graphene oxide (rGO). Under acidic conditions, the catalytic performance of Pt / CNFs-rGO in the electrochemical oxidation of methanol was studied by cyclic voltammetry and chronoamperometry. The results showed that Pt / CNFs-rGO exhibited higher catalytic performance for methanol oxidation than Pt / CNFs, Pt / rGO and commercial Pt / C catalysts. Pt / CNFs- The best catalytic effect of rGO. The introduction of carbon fiber can enhance the catalytic performance of Pt / rGO in methanol oxidation. The reason is that the introduction of CNFs effectively improves the stacking of graphene sheets and improves the utilization of Pt particles.