A three-dimensional Co 5 -cluster-based MOF as a high-performance electrode material for supercapacitor
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ORIGINAL PAPER
A three-dimensional Co5-cluster-based MOF as a high-performance electrode material for supercapacitor Gexiang Gao 1 & Xianmei Wang 1 & Yanwei Ma 1 & Hongren Rong 1 & Lifang Lai 1 & Qi Liu 1 Received: 24 December 2019 / Accepted: 2 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Searching for new metal–organic frameworks with excellent electrochemical performances is considerably important to advance their application in supercapacitors. Herein, a Co 5-cluster-based three-dimensional (3D) metal–organic framework (Co5(OH)2(O2CCH3)8·2H2O, Co5-MOF) was synthesized and characterized by X-ray powder diffraction, infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption. The Co5-MOF as an electrode material of supercapacitors was investigated for the first time. In a three-electrode system, the highest specific capacitance for the Co5-MOF electrode is 867 F g−1 at 1 A g−1, and the specific capacitance still remains 90.3% of the original specific capacitance after 3000 cycles, displaying its good long-term cycle stability. The asymmetric supercapacitor based on the Co5-MOF as the positive electrode and the rGO as the negative electrode presented a high energy density of 18 W h kg−1 at a power density of 0.7 kW kg−1. The high supercapacitive properties may be attributed to the nano-sized Co5-MOF particles with larger specific surface area and pore structure. Keywords Cobalt compound . MOFs . Electrode materials . Supercapacitors
Introduction In the modern society, energy demand is growing, and concerns about the depletion of fossil fuel and related environmental pollution are becoming more and more serious [1–3]. The pursuit of renewable energy and sustainable storage technology has become a global research goal to solve the energy and environmental crisis [4, 5]. Supercapacitors are one of the most promising candidates because they typically have a higher power density and longer cycle life than batteries [6, 7]. Accordingly, supercapacitors have been applied in computer Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03649-8) contains supplementary material, which is available to authorized users. * Hongren Rong [email protected] * Qi Liu [email protected] 1
School of Petrochemical Engineering, Jiangsu Province Key Laboratory of Fine Petrochemical Engineering and Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, Jiangsu, China
memory backup systems, portable electronics, military and industrial equipment, and flexible electronic devices [8]. However, their lower energy density restricts more widely applications of them in many fields. To increase the energy density of the supercapacitor, one of the fundamental conditions is using the electrode material with the high specific capacitance [9–14]. Therefore, it is very important to develop new electrode materials with exc
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