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Graphene Quantum Dots Supported by Graphene Nanoribbons with Ultrahigh Electrocatalytic Performance for Oxygen Reduction
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2015-06-15 , DOI: 10.1021/jacs.5b03799
Huile Jin 1 , Huihui Huang 1 , Yuhua He 1 , Xin Feng 1 , Shun Wang 1 , Liming Dai 2 , Jichang Wang 1, 3
Affiliation  

A new class of oxygen reduction reaction (ORR) catalysts based on graphene quantum dots (GQDs) supported by graphene nanoribbons (GNRs) has been developed through a one-step simultaneous reduction reaction, leading to ultrahigh performance for O reduction with an excellent electrocatalytic activity (higher limiting current density and lower overpotential than those of platinum) and high selectivity and stability in alkaline media comparable to the best C-based ORR catalysts reported so far. Electron microscopy revealed numerous surface/edge defects on the GQD/GNR surfaces and at their interface to act as the active sites. This, coupled with efficient charge transfer between the intimately contacted GQDs and GNRs, rationalized the observed ultrahigh electrocatalytic performance for the resultant GQD-GNR hybrids. Thus, this study opens a new direction for developing low-cost, highly efficient, C-based ORR electrocatalysts.

中文翻译:

石墨烯纳米带支撑的石墨烯量子点具有超高电催化氧还原性能

基于石墨烯纳米带(GNRs)支撑的石墨烯量子点(GQDs)的一类新型氧还原反应(ORR)催化剂通过一步同步还原反应被开发出来,导致具有优异电催化活性的超高性能O还原(比铂更高的极限电流密度和更低的过电位)以及在碱性介质中的高选择性和稳定性,可与迄今为止报道的最佳 C 基 ORR 催化剂相媲美。电子显微镜显示 GQD/GNR 表面和它们的界面上有许多表面/边缘缺陷作为活性位点。这与紧密接触的 GQD 和 GNR 之间的有效电荷转移相结合,使所观察到的 GQD-GNR 杂化物的超高电催化性能合理化。因此,
更新日期:2015-06-15
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