超级电容器
材料科学
碳纳米管
电极
钴
镍
碳纤维
化学工程
磷酸盐
纳米技术
复合材料
电化学
有机化学
复合数
化学
冶金
物理化学
工程类
作者
Yangyang Chen,Hewei Hou,Bing Liu,Moyang Li,Lan Chen,Changzhou Chen,Shuangfei Wang,Yuanyuan Li,Douyong Min
标识
DOI:10.1016/j.cej.2022.140453
摘要
• Carbon nanotube (CNT) grew in carbonized wood (CW) by chemical vapor deposition. • CNT/CW provided a scaffold with high conductivity and abundant loading sites. • Nickel-cobalt phosphate nanosheets loaded on CNT-CW by electrodeposition. • NiCo-P/CNT/CW exhibited ultra-high area specific capacitance and rate retention. • ASC delivered 5.7 mWh cm -3 with capacity retention of 92.4% after 10000 cycles. Lightweight carbonized wood (CW) loaded with pseudocapacitive materials has demonstrated excellent energy density. However, the direct loading of active materials usually results in poor rate performance and cycling stability. Herein, we fabricated a CW electrode with high loading of active materials and conductivity through chemical vapor deposition (CVD) and electrodeposition to sequentially incorporate carbon nanotubes (CNTs) and nickel-cobalt phosphate (NiCo-P) nanosheets. This integrated NiCo-P/CNT/CW electrode exhibited a promising areal capacitance of 11.2 F cm -2 at a current density of 10 mA cm -2 , and a notable capacitance retention rate of 86.6% at 60 mA cm -2 . The asymmetric supercapacitor (ASC) device assembled with the prepared electrode as anode and the self-activated carbonized wood (SCW) electrode as cathode delivers outstanding energy density of 5.74 mWh cm -3 (12.1 Wh kg -1 ) at power density of 18.75 mW cm -3 (39.5 W kg -1 ) while maintaining a high capacitance retention of 92.4% after 10,000 charge-discharge cycles. This work provides an advanced approach for constructing supercapacitors with remarkable energy density and rate performance from the natural wood derived electrodes.
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