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A self-supported hierarchical Co-MOF as a supercapacitor electrode with ultrahigh areal capacitance and excellent rate performance
- ZhuThese authors contributed equally to this work., Guilei, Wen, Hao, Ma, Min, Wang, Weiyi, Yang, Lin, Wang, Linchun, Shi, Xifeng, Cheng, Xiaowei, Sun, Xuping, Yao, Yadong
- Chemical communications 2018 v.54 no.74 pp. 10499-10502
- activated carbon, capacitance, chemical reactions, coordination polymers, electrodes, energy, energy density, foams, nickel, porosity, potassium hydroxide, surface area
- Metal–organic frameworks (MOFs) have emerged as attractive electrode materials for applications in energy storage and conversion, owing to their high porosity and surface area. In this communication, we report a hierarchically structured Co-MOF supported on nickel foam (Co-MOF/NF) serving as a high-performance electrode material for supercapacitors. The as-obtained Co-MOF/NF exhibits an ultrahigh areal specific capacitance of 13.6 F cm⁻² at 2 mA cm⁻² in 2 M KOH, exceeding those of the previously reported MOF-based materials. It also shows an excellent rate performance of 79.4% at a current density of 20 mA cm⁻². An asymmetric supercapacitor (ASC) device employing Co-MOF/NF as the positive electrode and activated carbon (AC) as the negative electrode achieves a high energy density of 1.7 mW h cm⁻² at a power density of 4.0 mW cm⁻² with a capacitance retention of 69.7% after 2000 cycles.