Enhanced electrocatalytic activity of high Pt-loadings on surface functionalized graphene nanosheets for methanol oxidation
Enhanced electrocatalytic activity of high Pt-loadings on surface functionalized graphene nanosheets for methanol oxidation
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DOI：
10.1016/j.ijhydene.2013.09.108
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发表时间：
2013-12
影响因子：
7.2
通讯作者：
Mingmei Zhang;Jimin Xie;Qian Sun;Zaoxue Yan;C. Min;Junjie Jing
中科院分区：
文献类型：
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作者：
Mingmei Zhang;Jimin Xie;Qian Sun;Zaoxue Yan;C. Min;Junjie Jing
本文报道了一种简单的单锅微波多元醇还原方法，在聚二烯基二甲基氯化铵（PDDA）的帮助下将铂纳米颗粒锚定在石墨烯上，形成Pt/PDDA - g杂化物（Pt/PDDA - g）。高铂金属负载高达85 wt.%，平均尺寸为1.4 nm，被密集地原位装饰在pda修饰的石墨烯表面上。电化学测试结果表明，pda -石墨烯复合基体负载Pt对甲醇氧化的活性和稳定性优于石墨烯片负载Pt，也优于电极上相同Pt含量的广泛使用的Pt/炭黑电催化剂。这种活性的提高表明，PDDA在铂纳米颗粒在石墨烯上的高度分散和稳定中起着至关重要的作用，PDDA - g可以作为直接甲醇燃料电池中铂固定的替代支持物。
Here we report a simple one-pot microwave-polyol reduced method to anchor platinum nanoparticles on graphene with the aid of poly (diallyldimethylammonium chloride) (PDDA), forming a Pt/PDDA–G hybrid (Pt/PDDA–G). High Pt metal loadings, up to 85 wt.% with a mean size of 1.4 nm, were densely in situ decorated on PDDA-modified graphene surfaces. The electrochemical tests showed that the activity and stability of Pt supported on PDDA–graphene hybrid substrates for methanol oxidation were better than that of Pt supported on graphene sheets, also better than the widely used Pt/carbon black electrocatalysts with the same Pt content on the electrode. This improved activity indicates that PDDA plays a crucial role in the highly dispersion and stabilization of Pt nanoparticles on graphene and PDDA–G are able to an alternative support for Pt immobilization in direct methanol fuel cells.