Nitrogen-Doped Carbon Nanosheets with Size-Defined Mesopores as Highly Efficient Metal-Free Catalyst for the Oxygen Reduction Reaction
Nitrogen-Doped Carbon Nanosheets with Size-Defined Mesopores as Highly Efficient Metal-Free Catalyst for the Oxygen Reduction Reaction
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DOI：
10.1002/anie.201307319
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发表时间：
2014-02-03
影响因子：
16.6
通讯作者：
Muellen, Klaus
中科院分区：
文献类型：
--
作者：
Wei, Wei;Liang, Haiwei;Muellen, Klaus
氮掺杂碳纳米片（NDCN）具有一定尺寸的介孔，是氧还原反应（ORR）的高效无金属催化剂。采用模板法制备了均匀可调的NDCN介孔结构。NDCN的这种可控介孔结构对ORR在碱性和酸性介质中的电催化性能都有重要影响。孔径为22nm的NDCN催化剂在碱性介质中表现出比Pt/C更高的ORR起始电位（-0.01V vs. -0.02V）和接近Pt/C的高扩散限制电流（5.45 vs. 5.78mAcm(-2)）。此外，该催化剂在酸性条件下对ORR表现出明显的电催化活性和长期稳定性。NDCN独特的平面介孔壳提供了暴露的高电活性和稳定的催化位点，从而提高了无金属NDCN催化剂的电催化活性。
Nitrogen-doped carbon nanosheets (NDCN) with size-defined mesopores are reported as highly efficient metal-free catalyst for the oxygen reduction reaction (ORR). A uniform and tunable mesoporous structure of NDCN is prepared using a templating approach. Such controlled mesoporous structure in the NDCN exerts an essential influence on the electrocatalytic performance in both alkaline and acidic media for the ORR. The NDCN catalyst with a pore diameter of 22nm exhibits a more positive ORR onset potential than that of Pt/C (-0.01V vs. -0.02V) and a high diffusion-limited current approaching that of Pt/C (5.45 vs. 5.78mAcm(-2)) in alkaline medium. Moreover, the catalyst shows pronounced electrocatalytic activity and long-term stability towards the ORR under acidic conditions. The unique planar mesoporous shells of the NDCN provide exposed highly electroactive and stable catalytic sites, which boost the electrocatalytic activity of metal-free NDCN catalyst.