Synthesis of surface-functionalized graphene nanosheets with high Pt-loadings and their applications to methanol electrooxidation
Synthesis of surface-functionalized graphene nanosheets with high Pt-loadings and their applications to methanol electrooxidation
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DOI：
10.1016/j.carbon.2010.10.055
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发表时间：
2011-03
期刊：
影响因子：
10.9
通讯作者：
S. Choi;M. Seo;H. J. Kim;W. Kim
中科院分区：
文献类型：
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作者：
S. Choi;M. Seo;H. J. Kim;W. Kim
以天然石墨为原料，经化学氧化和热剥离制备了表面功能化石墨烯纳米片。在合成的GNS载体上沉积了高达80 wt.%的高Pt金属负载，并且Pt粒度保持在小于3nm。使用这些Pt/GNS催化剂的甲醇电氧化电流密度至少是使用传统Pt/C催化剂的两倍。此外，这些Pt/GNS催化剂随着工作电极上Pt负载的增加而保持较高的Pt质量活性，范围在0.2 ~ 2.0mg/cm2之间。这种质量活性的提高表明，与传统催化剂相比，我们的电催化剂能够更有效地利用酒精电氧化中的铂。
Surface-functionalized graphene nanosheets (GNSs) were synthesized from natural graphite via chemical oxidation and subsequent thermal exfoliation. High Pt metal loadings, up to 80 wt.%, were deposited over the synthesized GNS supports and the Pt particle size was maintained at less than 3nm. The current densities of methanol electrooxidation with these Pt/GNS catalysts were at least twice as large as those observed with conventional Pt/C catalysts. Furthermore, these Pt/GNS catalysts maintained high Pt mass activities with increased Pt loading on the working electrode, ranging from 0.2 to 2.0mg/cm2. This improved mass activity indicates that our electrocatalysts are able to provide more efficient Pt utilization for alcohol electrooxidation compared to conventional catalysts.