Song Yin, Ding Yuanhao, Yang Chenghua, Pei Xiaokang, Wang Guangxia, Zheng Dezhou, Xu Wei, Wang Fuxin, Lu Xihong
School of Applied Physics and Materials, Wuyi University Jiangmen 529020 PR China
MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 PR China
RSC Adv. 2022 Apr 14;12(19):11665-11670. doi: 10.1039/d2ra01648f. eCollection 2022 Apr 13.
With high reactivity, electrical conductivity, theoretical specific capacitance and well redox reversibility, transition metal sulfides are considered as a promising anode material for supercapacitors. Hence, we designed a simple two-step hydrothermal process to grow CoS nanorod arrays on flexible carbon cloth substrates. Benefited from the larger specific surface area of nanoarrays, the binder-free CoS electrode demonstrates a higher specific capacity of 1.97 F cm at a current density of 2 mA cm, while the CoO electrode has a capacity of only 0.07 F cm at the same current density. Surprisingly, at a high scan rate of 200 mV s, the synthesized CoS electrode still maintains almost 100% of its initial capacitance after 5000 cycles. Moreover, when using the prepared CoS and MnO electrode as the anode and cathode, the fabricated flexible supercapacitor obtains a high volumetric energy density of 0.87 mW h cm (power density of 0.78 W cm) and a peak power density of 0.89 W cm (energy density of 0.50 mW h cm). The excellent electrochemical properties imply that there is a large market for the prepared materials in flexible energy storage devices.
过渡金属硫化物具有高反应活性、导电性、理论比电容和良好的氧化还原可逆性，被认为是超级电容器有前景的阳极材料。因此，我们设计了一种简单的两步水热法，在柔性碳布基底上生长硫化钴纳米棒阵列。得益于纳米阵列较大的比表面积，无粘结剂的硫化钴电极在电流密度为2 mA/cm²时展现出1.97 F/cm²的更高比容量，而氧化钴电极在相同电流密度下的容量仅为0.07 F/cm²。令人惊讶的是，在200 mV/s的高扫描速率下，合成的硫化钴电极在5000次循环后仍几乎保持其初始电容的100%。此外，当使用制备的硫化钴和二氧化锰电极分别作为阳极和阴极时，所制备的柔性超级电容器获得了0.87 mW h/cm³的高体积能量密度（功率密度为0.78 W/cm³）和0.89 W/cm³的峰值功率密度（能量密度为0.50 mW h/cm³）。优异的电化学性能表明所制备的材料在柔性储能器件中有很大的市场。
