High electrochemical stability and low-agglomeration of defective Co3O4 nanoparticles supported on N-doped graphitic carbon nano-spheres for oxygen evolution reaction |
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| Affiliation: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China;2. Istituto Nanoscienze-CNR, Via Campi 213a, I-41125 Modena, Italy;3. Laboratory for Chemistry of Novel Materials, University of Mons, Place Du Parc 20, 7000 Mons, Belgium;4. Wigner Research Centre for Physics, PO Box 49, H-1525, Budapest, Hungary;5. Laboratoire de Chimie Appliquée des Materiaux, Faculty of Sciences, Mohammed V University, Rabat, Morocco;1. School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China;2. Yunnan Province Key Lab of Wood Adhesives and Glued Products & Key Lab for Forest Resources Conservation and Utilization in the Southwest Mountains, Southwest Forestry University, Kunming 650224, China;3. State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan, Yunnan University, Kunming, 650091, China;1. School of Environmental Science and Engineering / Tianjin Key Lab of Biomass-wastes Utilization, Tianjin University, Tianjin 300072, China;2. Department of Civil Engineering, Pakistan Institute of Engineering Technology, Multan Pakistan;3. School of Engineering, The University of Toledo, Ohio, USA;4. School of Engineering RMIT University Melbourne Victoria 3000, Australia;5. School of Chemical Engineering of Technology, Tianjin University, Tianjin 300350, China;1. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Atómico Bariloche (CNEA), Av. Bustillo 9500, R8402AGP, S.C. de Bariloche, Río Negro, Argentina;2. Department of Chemistry, University of Burgos, 09001, Burgos, Spain;3. International Research Center in Critical Raw Materials for Advanced Industrial Technologies (ICCRAM), University of Burgos, 09001 Burgos, Spain;4. Universidad Nacional de Cuyo (Instituto Balseiro)-Centro Atómico Bariloche (CNEA), Av. Bustillo 9500, R8402AGP, S.C. de Bariloche, Río Negro, Argentina |
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| Abstract: | The design of hybrid electrocatalysts with abundant active sites and long term stability is crucial for efficient oxygen evolution reaction (OER) application. Cobalt oxide is considered as one of the most promising electrocatalysts to replace noble metal due to its low cost, availability, and electrocatalytic activity towards the oxygen evolution reaction in alkaline media. However, nano-scale cobalt oxide suffers from severe surface self-agglomeration during the OER process, so that leading to poor activity and durability. Herein, ultra-small cobalt oxide nanoparticles are anchored on the surface of nitrogen doped porous 3D graphitic carbon nano-spheres (N-ACS@Co3O4) to increase the amount of exposed active site and avoid the self-agglomeration. The obtained electrocatalyst (N-ACS@Co3O4) is enriched with abundant oxygen vacancies and exhibits a superior OER activity (Overpotential of 237 mV at 10 mA.cm−2) and exceptional stability for at least 30 h in alkaline electrolyte (1 M KOH). The DFT calculations demonstrate that the strong adsorption of Co3O4 on N-doped graphene can prevent its agglomeration, and therefore improves the stability of Co3O4 nanoparticles during OER process in line with the experimental results. |
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| Keywords: | Stability Low-agglomeration N-doped graphitic carbon Oxygen evolution reaction |
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