Graphene Quantum Dots Supported by Graphene Nanoribbons with Ultrahigh Electrocatalytic Performance for Oxygen Reduction
详细信息 查看全文
- 作者：Huile Jin ; Huihui Huang ; Yuhua He ; Xin Feng ; Shun Wang ; Liming Dai ; Jichang Wang
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：June 24, 2015
- 年：2015
- 卷：137
- 期：24
- 页码：7588-7591
- 全文大小：343K
- ISSN：1520-5126
文摘
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.