双功能
电催化剂
石墨烯
析氧
电解质
催化作用
杂原子
材料科学
化学工程
碳纤维
纳米技术
双功能催化剂
无机化学
化学
电极
电化学
复合数
有机化学
工程类
物理化学
复合材料
戒指(化学)
作者
Hong Bin Yang,Jianwei Miao,Sung‐Fu Hung,Jiazang Chen,Hua Bing Tao,Xizu Wang,Liping Zhang,Rong Chen,Jiajian Gao,Hao Ming Chen,Liming Dai,Bin Liu
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2016-04-01
卷期号:2 (4)
被引量:1122
标识
DOI:10.1126/sciadv.1501122
摘要
Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical to renewable energy conversion and storage technologies. Heteroatom-doped carbon nanomaterials have been reported to be efficient metal-free electrocatalysts for ORR in fuel cells for energy conversion, as well as ORR and OER in metal-air batteries for energy storage. We reported that metal-free three-dimensional (3D) graphene nanoribbon networks (N-GRW) doped with nitrogen exhibited superb bifunctional electrocatalytic activities for both ORR and OER, with an excellent stability in alkaline electrolytes (for example, KOH). For the first time, it was experimentally demonstrated that the electron-donating quaternary N sites were responsible for ORR, whereas the electron-withdrawing pyridinic N moieties in N-GRW served as active sites for OER. The unique 3D nanoarchitecture provided a high density of the ORR and OER active sites and facilitated the electrolyte and electron transports. As a result, the as-prepared N-GRW holds great potential as a low-cost, highly efficient air cathode in rechargeable metal-air batteries. Rechargeable zinc-air batteries with the N-GRW air electrode in a two-electrode configuration exhibited an open-circuit voltage of 1.46 V, a specific capacity of 873 mAh g(-1), and a peak power density of 65 mW cm(-2), which could be continuously charged and discharged with an excellent cycling stability. Our work should open up new avenues for the development of various carbon-based metal-free bifunctional electrocatalysts of practical significance.
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