磷化物
超级电容器
材料科学
储能
电容
电极
镍
电池(电)
功率密度
钴
过渡金属
纳米技术
化学工程
冶金
催化作用
化学
功率(物理)
工程类
量子力学
生物化学
物理
物理化学
作者
Moo-Young Jung,Hyobeen Cho,Chanyong Lee,Yong Ju Yun,Suresh Kannan Balasingam,Yongseok Jun
标识
DOI:10.1016/j.est.2023.107321
摘要
The development of high energy density supercapacitors is essential due to the increasing concerns about environmental pollution and the demand for energy storage systems. Although the commercial electrode for the supercapacitor is composed of an electric double layer capacitance (EDLC)-based carbon materials, other transition metal-based pseudocapacitive or battery-like materials have also been investigated by many researchers; the energy density value of these devices need subsequent improvement. In this study, we developed hybrid electrodes composed of metal-organic frame-derived cobalt phosphide (CoP) and electrodeposited nickel phosphide (NiP) materials on nickel foam (NF). This hybrid electrode shows a high energy density value due to the combination of a pseudocapacitive CoP with a battery-like NiP material. The NiP/CoP@NF electrode exhibits an enhanced specific capacitance of 1154.4 F g−1 at 1 A g−1, which are much higher than those of individual NiP@NF and CoP@NF. The asymmetric supercapacitor (ASC) exhibits an excellent energy density of 27.7 Wh kg−1 at a power density of 800 W kg−1 and long-term stability with capacitance retention of 86.36 % for up to 10,000 cycles, representing their remarkable energy storage performance when compared to the previously reported NiCoP-based ASCs.
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