Liu Weijing, Zhu Fangfang, Liu Yu, Shi Weidong
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
J Colloid Interface Sci. 2020 Oct 15;578:1-9. doi: 10.1016/j.jcis.2020.05.107. Epub 2020 May 30.
The research on the structure tuning of CoP in supercapacitors has received extensive attention. However, low specific capacitance and energy density limit its further development. Here, we successfully synthesize the CoP@Ni(OH)·0.75HO core-shell nanosheets structure on carbon cloth. CoP nanowires, as the core, can provide efficient charge transportation path for electron transfer, while the thin Ni(OH)·0.75HO nanosheets shell can increase the specific surface area and curtail the transport distance. As a result, the as-prepared CoP@Ni(OH)·0.75HO nanosheet arrays electrode presents an outstanding specific capacity of 168.61 mAh g at 1 A g. The assembled asymmetric supercapacitor (ASC) of CoP@Ni(OH)·0.75HO//activated carbon displays the highest energy density of 33.78 W h kg at 800 W kg, as well as the remarkable cycling stability (capacitance retention of 98.5% after 10,000 cycles). Furthermore, ten parallel LEDs can be powered up by two ASCs connected in series. Thus, this article provides a new idea for the core-shell structure prepared by using CoP as the skeleton.
超级电容器中CoP结构调控的研究受到了广泛关注。然而，低比电容和能量密度限制了其进一步发展。在此，我们成功地在碳布上合成了CoP@Ni(OH)·0.75H₂O核壳纳米片结构。作为核心的CoP纳米线可为电子转移提供高效的电荷传输路径，而薄的Ni(OH)·0.75H₂O纳米片壳层可增加比表面积并缩短传输距离。结果，所制备的CoP@Ni(OH)·0.75H₂O纳米片阵列电极在1 A g时表现出168.61 mAh g的出色比容量。CoP@Ni(OH)·0.75H₂O//活性炭组装的不对称超级电容器（ASC）在800 W kg时显示出33.78 W h kg的最高能量密度，以及出色的循环稳定性（10000次循环后电容保持率为98.5%）。此外，十个并联的发光二极管可由两个串联的ASC供电。因此，本文为以CoP为骨架制备核壳结构提供了新思路。
