Pt-Sn/石墨烯催化剂对甲醇催化性能的研究
首发时间:2012-02-20
摘要:使用改进的Hummers法制备氧化石墨烯,再利用浸渍还原法一步制备得到石墨烯基Pt-Sn催化剂(Pt-Sn/graphene),氧化石墨烯在反应过程中被乙二醇原位还原为石墨烯。所制得的Pt-Sn纳米颗粒均匀分布在石墨烯表面,平均粒径为3.19nm。XPS表明,Sn元素部分以SnO2的形式存在。电化学研究表明,石墨烯做载体相较炭黑做载体更能明显提高纳米金属颗粒的催化效果。Pt-Sn/graphene催化剂在保证催化效果的前提下,使甲醇的氧化能够在更低的电位下进行。Sn元素与石墨烯的协同作用,有效的增强了催化剂抗CO中毒能力,使IF/IR值高达2.18。
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Electrocatalytic property of Pt-Sn/graphene catalysts for Methanol
Abstract:Modified Hummers method was employed to synthesize graphene oxide, and Pt-Sn/graphene catalysts were prepared using a chemical reducing approach in one step. During the reaction, graphene oxide was reduced to graphene in suit. The nanoparticles were uniformly dispersed on graphene surface with a diameter of 3.19nm. Partly of Sn existed in the formation of SnO2. According to the results of electrochemical characterization, the electrocatalytic property of graphene-based catalysts were apparently better than that of carbon black-based catalysts. As the Pt-Sn/graphene possessing a favourable catalytic effect, the oxidation of methonal can be proceeding under lower potential. With the synergistic effect of Sn and graphene, tolerance toward CO of Pt was effectively strengthened, and the IF/IR reached to 2.18.
Keywords: materials chemistry graphene electrocatalysis Sn
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