超级电容器
材料科学
电容
复合数
生物炭
储能
功率密度
电解质
镍
电化学
电极
化学工程
复合材料
化学
冶金
热解
功率(物理)
物理
物理化学
量子力学
工程类
作者
Akhil Pradiprao Khedulkar,Van Dien Dang,Bidhan Pandit,Thi Ai Ngoc Bui,Hai Linh Tran,Ruey‐an Doong
标识
DOI:10.1016/j.jcis.2022.04.178
摘要
Renewable and sustainable high-performance energy storage devices are desirable to fulfill the demands of next-generation power sources. In this study, we report a flower-like nickel hydroxide/spent tea leaf-derived biochar (NiNF@TBC) composite for high-performance supercapacitor application. The tea leaf-derived biochar (TBC) with a specific surface area of 1340 m2 g-1 is used as the Ni(OH)2 support to fabricate NiNF@TBC composites. The highly porous and hierarchical structure of the as-synthesized NiNF@TBC composite facilitates the electrolyte ion and electron diffusion and transport more readily. As a result, the decrease in diffusion path and the increase in conductivity of NiNF@TBC for energy storage applications. The NiNF@TBC electrode shows excellent electrochemical properties with a specific capacitance of 945 F g-1 at 1 A g-1 in a three-electrode cell and high stability of 95% after 10,000 cycles. Moreover, the symmetric supercapacitor fabricated with NiNF@TBC delivers a specific capacitance of 163 F g-1 in 1 M Na2SO4 solution. The Ragone plot of the symmetric device exhibits energy density in the range of 19 - 58 Wh kg-1 with power density in the scale of 826 - 6321 W kg-1. An excellent long-term cyclic stability of 94% is obtained after 10,000 charge-discharge cycles. Such an excellent performance has demonstrated the feasibility of utilizing agricultural wastes as green carbon sources, which can combine with various metal hydroxides to produce hybrid nanomaterials as a highly potential electrode material for green sustainable supercapacitor applications.
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