Low-cost fabrication of amorphous cobalt-iron-boron nanosheets for high-performance asymmetric supercapacitors
By Meng, Qingzhuo; Xu, Wence; Zhu, Shengli; Liang, Yanqin; Cui, Zhenduo; Yang, Xianjin; Inoue, Akihisa
Published in Electrochimica Acta
2019
Abstract
The ultrathin amorphous Co-Fe-B nanosheets on the three dimensional nickel foam substrate is fabricated by a facile one-step chemical reduction method. Due to the amorphous structure and ultrathin nanosheet morphology, the Co-Fe-B material shows an excellent specific capacitance (?981 F g?1 at 1 A g?1) and high rate performance. In addition, the Co-Fe-B//active carbon (Co-Fe-B//AC) asymmetric supercapacitors were prepared. The ASC shows a maximum energy density of 21 W h kg?1 (calculated by active materials weight). It also displays excellent long-term stability and the capacitance increase 26% after 5000 cycles. These outstanding supercapacitor performances demonstrate Co-Fe-B material as a low cost candidate material applying to energy storage and conversion.
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