Hydrothermal Synthesis of Hybrid Rod‐Like Hollow CoWO4/Co1−xS for High‐Performance Supercapacitors,ChemElectroChem

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Hydrothermal Synthesis of Hybrid Rod‐Like Hollow CoWO4/Co1−xS for High‐Performance Supercapacitors
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-02-06 , DOI: 10.1002/celc.201701324
Jinhua Ge ₁ , Jihuai Wu ₁ , Jia Dong ₁ , Jinbiao Jia ₁ , Beirong Ye ₁ , Si Jiang ₁ , Jijia Zeng ₁ , Quanlin Bao ₁

Affiliation

A rod‐like hollow cobalt tungstate/non‐stoichiometric cobalt sulfide (CoWO₄/Co_1−xS) hybrid is successfully grown in situ on nickel foam through a simple two‐step hydrothermal process. Owing to the unique hollow structure, the as‐synthesized CoWO₄/Co_1−xS hybrid electrode possesses a large surface area and delivers a high specific capacitance of 1894.5 F ⋅ g⁻¹ at a current density of 1 A ⋅ g⁻¹. By using the CoWO₄/Co_1−xS hybrid electrode as the anode and an activated carbon (AC) electrode as the cathode, an asymmetric supercapacitor of CoWO₄/Co_1−xS//AC exhibits a high capacitance of 103.1 F ⋅ g⁻¹ and high specific capacitance retention of 87.27 % after 5000 cycles. Furthermore, the asymmetric supercapacitor demonstrates a maximum power density of 4000 W ⋅ kg⁻¹ at an energy density of 22.5 Wh ⋅ kg⁻¹. The superior performance of the device can be ascribed to distinctive structure and positive synergistic effects in the hybrid. The facile preparation process and excellent performance presented here indicate the CoWO₄/Co_1−xS hybrid to be a promising candidate electrode material for supercapacitor applications.

中文翻译：

用于高性能超级电容器的棒状空心CoWO4 / Co1-xS混合水热合成

通过简单的两步水热过程，成功地在泡沫镍上原位生长了棒状空心钨酸钴/非化学计量硫化钴（CoWO ₄ / Co _{1- x} S）杂化物。由于该独特的中空结构，所合成的CoWO ₄ / Co的_{1- X}的混合动力电极具有大的表面积，并提供的1894.5 F A高的比电容⋅克^-1处的1的⋅g的电流密度^-1。通过使用CoWO ₄ / Co的_{1- X}的混合动力电极作为阳极和活性炭（AC）电极作为阴极，CoWO的不对称超级电容器₄ / Co的_1-x S // AC在5000个循环后表现出103.1 F⋅g^-1的高电容和87.27％的高比电容保持率。此外，非对称超电容器演示W¯¯⋅公斤4000的最大功率密度^-1在22.5瓦⋅千克的能量密度^-1。该设备的卓越性能可归因于混合动力系统中独特的结构和积极的协同效应。此处提供的简便的制备过程和出色的性能表明，CoWO₄ / Co_{1- x} S杂化物是用于超级电容器应用的有希望的候选电极材料。

更新日期：2018-02-06

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