过电位
石墨烯
化学
量子点
石墨烯纳米带
催化作用
石墨烯量子点
纳米技术
电化学
材料科学
电催化剂
化学工程
电极
物理化学
有机化学
工程类
作者
Huile Jin,Huihui Huang,Yuhua He,Xin Feng,Shun Wang,Liming Dai,Jichang Wang
摘要
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.
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