High-Performance Metal-Free Nanosheets Array Electrocatalyst for Oxygen Evolution Reaction in Acid
Lei C, Zheng Q, Cheng F, Hou Y, Yang B, Li Z, Wen Z, Lei L, Chai G, Feng X (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 30
Article Number: 2003000
Journal Issue: 31
Abstract
Development of low cost electrocatalysts with outstanding catalytic activity and stability for oxygen evolution reaction (OER) in acid is a major challenge to produce hydrogen energy from water splitting. Herein, a novel metal-free electrocatalyst consisting of a oxygen-functionalized electrochemically exfoliated graphene (OEEG) nanosheets array is reported. Benefitting from a vertically aligned arrays structure and introducing oxygen functional groups, the metal-free OEEG nanosheets array exhibits superior electrocatalytic activity and stability toward OER with a low overpotential of 334 mV at 10 mA cm−2 in acidic electrolyte. Such a high OER performance is thus far the best among all previously reported metal-free carbon-based materials, and even superior to commercial Ir/C catalysts (420 mV at 10 mA cm−2) in acid. Characterization results and electrochemical measurements identify the COOH species in the OEEG acting as active sites for acidic OER, which is further supported by atomic-scale scanning transmission electron microscopy imaging and electron energy-loss spectroscopy. Density functional theory calculations reveal that the reaction pathway of dual sites that is mixed by zigzag and armchair edges (COOH-zig-corner) is better than the pathway of single site.
Involved external institutions
National Center for Nanoscience and Technology (NCNST) / 国家纳米科学中心
China (CN)
Zhejiang University
China (CN)
Chinese Academy of Sciences (CAS) / 中国科学院
China (CN)
Technische Universität Dresden
Germany (DE)
China (CN)
Zhejiang University
China (CN)
Chinese Academy of Sciences (CAS) / 中国科学院
China (CN)
Technische Universität Dresden
Germany (DE)
How to cite
APA:
Lei, C., Zheng, Q., Cheng, F., Hou, Y., Yang, B., Li, Z.,... Feng, X. (2020). High-Performance Metal-Free Nanosheets Array Electrocatalyst for Oxygen Evolution Reaction in Acid. Advanced Functional Materials, 30(31). https://doi.org/10.1002/adfm.202003000
MLA:
Lei, Chaojun, et al. "High-Performance Metal-Free Nanosheets Array Electrocatalyst for Oxygen Evolution Reaction in Acid." Advanced Functional Materials 30.31 (2020).
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