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Acid etching halloysite loaded cobalt boride material for supercapacitor electrode application
Abstract Inexpensive and eco-friendly cobalt boride@etched halloysite (CoB@eHal) composites with excellent electrochemical performances were fabricated by a facile combination of acid etching and chemical liquid-phase reduction. The highly conductive CoB nanoparticles were tightly combined with etched halloysite in a loaded manner. Owing to the open channels of etched halloysite after acid etching and the loading of intermetallic CoB, the CoB@eHal-12 composite exhibited a relatively large specific surface and low charge transfer resistance. The charge storage mechanism belonged to redox pseudocapacitance, and the contribution of pseudocapacitance in the whole charge storage process is 67.9%. The optimized CoB@eHal-12 demonstrated satisfactory specific capacitance of 266.9 F g−1 at 0.5 A g−1, outstanding rate capacity and unexceptionable cycling stability of approximately 84.7% retention over 10,000 continuous charge-discharge cycles. Furthermore, an asymmetric supercapacitor was constructed by using the CoB@eHal-12 as a cathode and activated carbon (AC) as an anode. The obtained CoB@eHal-12//AC device delivered a maximum energy density of 17.0 W h kg−1 with a power density of 200.2 W kg−1, and a satisfactory life cycle.
Graphical abstract Display Omitted
Highlights The halloysite was used in the electrochemical energy storage field. The influences of CoB loading and time for acid etching were explored. The CoB@eHal-12 electrode owned satisfactory specific capacitance. The assembled CoB@eHal-12//AC device showed good performance.
Acid etching halloysite loaded cobalt boride material for supercapacitor electrode application
Abstract Inexpensive and eco-friendly cobalt boride@etched halloysite (CoB@eHal) composites with excellent electrochemical performances were fabricated by a facile combination of acid etching and chemical liquid-phase reduction. The highly conductive CoB nanoparticles were tightly combined with etched halloysite in a loaded manner. Owing to the open channels of etched halloysite after acid etching and the loading of intermetallic CoB, the CoB@eHal-12 composite exhibited a relatively large specific surface and low charge transfer resistance. The charge storage mechanism belonged to redox pseudocapacitance, and the contribution of pseudocapacitance in the whole charge storage process is 67.9%. The optimized CoB@eHal-12 demonstrated satisfactory specific capacitance of 266.9 F g−1 at 0.5 A g−1, outstanding rate capacity and unexceptionable cycling stability of approximately 84.7% retention over 10,000 continuous charge-discharge cycles. Furthermore, an asymmetric supercapacitor was constructed by using the CoB@eHal-12 as a cathode and activated carbon (AC) as an anode. The obtained CoB@eHal-12//AC device delivered a maximum energy density of 17.0 W h kg−1 with a power density of 200.2 W kg−1, and a satisfactory life cycle.
Graphical abstract Display Omitted
Highlights The halloysite was used in the electrochemical energy storage field. The influences of CoB loading and time for acid etching were explored. The CoB@eHal-12 electrode owned satisfactory specific capacitance. The assembled CoB@eHal-12//AC device showed good performance.
Acid etching halloysite loaded cobalt boride material for supercapacitor electrode application
Chai, Shan-Shan (author) / Zhang, Lun (author) / Zhang, Wei-Bin (author) / Bao, Xu (author) / Guo, Yao-Wen (author) / Han, Xiong-Wei (author) / Ma, Xue-Jing (author)
Applied Clay Science ; 218
2022-01-17
Article (Journal)
Electronic Resource
English
A novel cobalt–carbon composite for the electrochemical supercapacitor electrode material
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