Ultra-small Co/CoOx nanoparticles dispersed on N-doped carbon nanosheets for highly efficient electrocatalytic oxygen evolution reaction

被引：37
作者：
Chen, Chen [1 ,2 ]
Yang, Zhuojun [1 ,2 ]
Liang, Wei [2 ]
Yan, Hao [2 ]
Tuo, Yongxiao [1 ]
Li, Yanpeng [2 ]
Zhou, Yan [1 ]
Zhang, Jun [1 ,2 ]
机构：
[1] China Univ Petr East China, Coll Mat Sci & Engn, Qingdao 266580, Shandong, Peoples R China
[2] China Univ Petr East China, Coll Chem Engn, Qingdao 266580, Shandong, Peoples R China
来源：
JOURNAL OF ENERGY CHEMISTRY | 2021年 / 55卷
基金：
中国国家自然科学基金;
关键词：
Co/CoOx nanoparticle; Metal-organic framework; In-situ annealing; Nitrogen-doped porous carbon; Oxygen evolution reaction; Electrocatalysis; BIFUNCTIONAL ELECTROCATALYST; CO3O4; NANOSHEETS; FACILE SYNTHESIS; ANODE MATERIALS; ALKALINE; OXIDATION; CATALYST; NANOTUBES; NANOARRAY; GRAPHENE;
D O I：
10.1016/j.jechem.2020.07.017
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
In this paper, we report a facile strategy to synthesize Co-BDC-NH2 material, which is used as a precursor towards an excellent OER electrocatalyst by thermal annealing in nitrogen. Ultra-small Co/CoOx nanoparticles were uniformly dispersed on the rhombus N-doped carbon (NC) nanoflakes. Transmission electron microscopic, X-ray diffraction spectrometric, and X-ray photoelectron spectroscopic analyses revealed the coexistence of metallic Co and Co oxides nanoparticles. It was found that Co/CoOx@NC obtained at 500 degrees C annealing temperature exhibited the highest electrocatalytic OER activity, with 307 and 375 mV overpotential to achieve 10 and 100 mA cm(2) current densities. Besides, thanks to the in-situ annealing process, Co/CoOx@NC showed excellent catalytic stability with 97.4% current density retention after 24 h electrolysis at 1.66 V vs. RHE electrode potential. Further investigations revealed that the ultra-small Co/CoOx nanoparticles distributed on N-doped carbon template contribute significantly towards OER electrocatalysis through enlarging the activity surface areas and enhancing the intrinsic electrochemical activity due to the presence of metallic Co. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
引用
收藏
页码：345 / 354
页数：10
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