Solvothermal synthesis of Pt -SiO2/graphene nanocomposites as efficient electrocatalyst for methanol oxidation
Solvothermal synthesis of Pt -SiO2/graphene nanocomposites as efficient electrocatalyst for methanol oxidation
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DOI：
10.1016/j.electacta.2015.02.100
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发表时间：
2015-04-10
影响因子：
6.6
通讯作者：
Ngoc Quynh Bui
中科院分区：
文献类型：
--
作者：
Thu Ha Thi Vu;Thanh Thuy Thi Tran;Ngoc Quynh Bui
在这项工作中，Pt-SiO2/石墨烯纳米复合材料已在溶剂热条件下合成和研究作为电催化剂甲醇氧化。采用透射电子显微镜、X射线衍射、拉曼光谱、X射线光电子能谱和氮气吸附/脱附等手段对催化剂的结构和形貌进行了表征。这些纳米复合材料的Pt和SiO2含量测定电感耦合等离子体发射光谱法（ICP-OES）。采用循环伏安法、计时电流法、计时电位法和电化学阻抗谱研究了它们的电催化性能。与石墨烯负载Pt催化剂相比，该纳米复合材料具有更好的催化性能、更好的稳定性和更好的抗中毒能力。其中，SiO2含量为9.24%的催化剂对甲醇的电催化氧化性能最好，质量活性为1047 mA mg（1）。(C)2015爱思唯尔有限公司版权所有。
In this work, Pt-SiO2/graphene nanocomposites have been synthesized under solvothermal conditions and investigated as electrocatalysts for methanol oxidation. Structure and morphology of these catalysts are characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and nitrogen adsorption/desorption studies. The Pt and SiO2 contents of these nanocomposites are determined by inductively coupled plasma optical emission spectrometry (ICP-OES). Their electrocatalytic properties are investigated by cyclic voltammetry, chronoamperometry, chronopotentiometry and electrochemical impendence spectroscopy. The as-prepared nanocomposites show the improved catalytic performance, better stability and good antiposoining ability compared with Pt supported on graphene catalyst. Particularly, the catalyst containing 9.24% of SiO2 exhibits the best electrocatalytic performance for methanol oxidation with mass activity of 1047 mA mg (1). (C) 2015 Elsevier Ltd. All rights reserved.