PtPd nanowire arrays supported on reduced graphene oxide as advanced electrocatalysts for methanol oxidation
PtPd nanowire arrays supported on reduced graphene oxide as advanced electrocatalysts for methanol oxidation
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DOI：
10.1016/j.carbon.2014.07.076
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发表时间：
2014-11-01
期刊：
影响因子：
10.9
通讯作者：
Steinberger-Wilckens, Robert
中科院分区：
文献类型：
--
作者：
Du, Shangfeng;Lu, Yaxiang;Steinberger-Wilckens, Robert
采用温和的湿化学方法制备了还原氧化石墨烯（RGO）纳米片/PtPd纳米线杂化材料。均匀的Pt纳米线阵列被成功地支撑在功能化的RGO纳米片上，Pd纳米颗粒作为生长种子。整个沉积过程在室温下的水溶液中完成。TEM和HR-TEM分析表明，Pt纳米线呈单晶结构，直径约为100 nm。平均4 nm，长度为20-200 nm。电化学表征表明，杂化纳米结构具有更高的催化活性和稳定性比商业国家的最先进的铂黑催化剂（Hispec 1000）对甲醇氧化反应（莫尔）。在1000次电位扫描循环后，杂化纳米结构的初始质量活性为0.51 Amg（-1），降解率为17.2%，而Pt黑的初始质量活性为0.44 Amg（-1），降解率为27.5%，表明这种RGO/PtPd杂化物在DMFC应用中具有巨大的潜力。(C)2014爱思唯尔有限公司版权所有。
Novel reduced graphene oxide (RGO) nanosheet/PtPd nanowire hybrids were prepared by a mild wet chemical approach. Uniform Pt nanowire arrays are successfully supported on functionalized RGO nanosheets with Pd nanoparticles as growing seeds. The whole deposition process was achieved in aqueous solution at room temperature. TEM and HR-TEM analysis indicated the single-crystal feature of the Pt nanowires with a diameter of ca. 4 nm in average and a length of 20-200 nm. Electrochemical characterization demonstrated that the hybrid nanostructures have a higher catalytic activity and stability than commercial state-of-the-art platinum black catalysts (Hispec1000) toward the methanol oxidation reaction (MOR). An initial mass activity of 0.51 A mg(-1) and a degradation ratio of 17.2% after 1000 potential sweeping cycles were achieved for the hybrid nanostructures, compared with 0.44 A mg(-1) and 27.5% for Pt black, respectively, demonstrating a great potential of this RGO/PtPd hybrids for DMFC applications. (C) 2014 Elsevier Ltd. All rights reserved.