Metal-organic framework derived NiO/Ni@C composites as electrode materials with excellent electrochemical performance for supercapacitors
Metal-organic framework derived NiO/Ni@C composites as electrode materials with excellent electrochemical performance for supercapacitors
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金属有机骨架衍生的NiO/Ni@C复合材料作为超级电容器电极材料，具有优异的电化学性能
DOI：
10.1016/j.est.2021.102426
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发表时间：
2021-03-12
影响因子：
9.4
通讯作者：
Chen, ZhiQuan
中科院分区：
文献类型：
--
作者：
Jiang, XianYan;Deng, ShuPing;Chen, ZhiQuan
本文以柱撑Ni-2(Bdc)(2)(Dabco)(bdc=1，4-苯二甲酸，dabco=1，4-二氮杂双环[2.2.2]-辛烷)为前驱体，成功制备了金属氧化物/金属@碳(NiO/Ni@C)复合材料作为电极材料。由于NiO/Ni@C具有多个活性中心(NiO、Ni和C)、丰富的氧缺陷和丰富的Ni3+，所以NiO/Ni@C复合材料具有优异的电化学性能。在500℃焙烧的NiO/Ni@C电极材料在0.5Ag(-1)和10Ag(-1)时的最大比电容分别为805.3 Fg(-1)和576.2 Fg(-1)，表明其具有高倍率性能。组装的不对称超级电容器NiO/Ni@C//PEDOT-AC(聚(3，4-乙二氧基噻吩基)活性碳)具有0~1.7V的宽工作电压，20.7W h kg(-1)的高比能量，12920 W kg(-1)的高比功率，以及良好的循环稳定性，10000次循环后的容量保持率为69.7%。此外，红色发光二极管(LED)由两个串联的NiO/Ni@C//PEDOT-AC ASC点亮。
In this work, metal oxide/metal@carbon (NiO/Ni@C) composites as electrode materials have been successfully prepared using the pillared Ni-2(bdc)(2)(dabco) (bdc = 1,4-benzenedicarboxylic acid, dabco = 1,4diazabicyclo[2.2.2]-octane) as the precursor. Owing to the multiple active sites (NiO, Ni and Carbon), rich oxygen defects, and abundant Ni3+, the NiO/Ni@C composites show excellent electrochemical performance. A maximum specific capacitance of 805.3 F g(-1) at 0.5 A g(-1) and 576.2 F g(-1) at 10 A g(-1) is obtained for the NiO/Ni@C electrode material calcined at 500 degrees C, indicating a high rate capability. Meanwhile, the assembled asymmetric supercapacitor (ASC) NiO/Ni@C//PEDOT-AC (poly(3,4-ethylenedioxy-thiophene)activated carbon) has a wide working voltage of 0-1.7 V, high specific energy of 20.7 W h kg(-1), superior specific power of 12920 W kg(-1), and excellent cycle stability with capacitance retention of 69.7% after 10 000 cycles. Furthermore, a red light-emitting diode (LED) is lighted up by two NiO/Ni@C//PEDOT-AC ASCs in series connection.