Assemble from 0D to 3D: anchored 0D molybdenum carbide on 3D octahedral amorphous carbon with excellent capacitive prope
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Assemble from 0D to 3D: anchored 0D molybdenum carbide on 3D octahedral amorphous carbon with excellent capacitive properties Yu-Shan Zhang1,2, Chun Lu1,2, Yu-Xia Hu3, Bin-Mei Zhang1,2, Jun Li1,2, Chen-Yang Tian1,2, Dong-Ting Zhang1,2, Ling-Bin Kong1,2, and Mao-Cheng Liu1,2,* 1
School of Materials Science and Engineering, Lanzhou University of Technology, 287 Langongping Road, Lanzhou 730050, People’s Republic of China 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, 287 Langongping Road, Lanzhou 730050, People’s Republic of China 3 School of Bailie Engineering and Technology, Lanzhou City University, Lanzhou 730070, People’s Republic of China
Received: 3 June 2020
ABSTRACT
Accepted: 17 August 2020
Molybdenum carbide (Mo2C) is an attractive candidate as the electrode active material of supercapacitors (SCs) due to its low cost, outstanding electrical conductivity and superior chemical stability; however, the aggregation of Mo2C nanoparticles impedes its applications. Herein, zero-dimensional (0D) Mo2C nanoparticles are anchored on three-dimensional (3D) octahedral amorphous carbon (3DPO-Mo2C/C) by a mild and effective method with carbonizing and etching the Cu/Mo-based metal–organic framework. The 3DPO-Mo2C/C displays a large specific surface area, abundant mesopores and stable 3D structure, which not only expose more active reaction sites and shorten diffusion paths for electrolyte ions, but also prevent the aggregation and improve the structure stability of Mo2C nanoparticles. It exhibits an outstanding specific capacitances of 110 and 105 F g-1 in the electrolytes of 6 M KOH and 2 M EMIMA/AN. Employing the active carbon (AC) as counter electrode to assemble a SC with 3DPO-Mo2C/C as work electrode, which delivers higher energy and power densities of 12 Wh kg-1 and 1620 W kg-1, and the specific capacitance remains 91.3% after 6000 cycles. This approach not only prevents the aggregation of Mo2C nanoparticles successfully but also provides a possibility for Mo2C to be used in SCs.
Published online: 25 August 2020
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Joshua Tong. Yu-Shan Zhang and Chun Lu contributed equally to this work.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05119-y
15563
J Mater Sci (2020) 55:15562–15573
Introduction Transition metal carbides (TMCs) possess unique physical and chemical properties like excellent mechanical strength, superior corrosion resistance and good chemical stability [1, 2]. Mo2C as a kind of TMCs exhibits a great potential as the electrode material of SCs due to its special Mo–C bond, ultrahigh electrical conductivity, outstanding chemical stability and low cost [3]. Unfortunately, there are little researches of Mo2C nanoparticles in the field of SCs in reality, attributed to the overgrowth and aggregation of Mo2C nanoparticles in preparation, which leads to the formation of bulk with large particles, low specific su
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