Zhang Jian, Liu Xiaoxi, Yin Qing, Zhao Yajun, Luo Jianeng, Han Jingbin
State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
ACS Omega. 2019 Jul 9;4(7):11863-11870. doi: 10.1021/acsomega.9b01374. eCollection 2019 Jul 31.
A high-quality porous CoNiS nanoplates array was in situ synthesized on carbon fibers (CFs) by a hydrothermal method via a CoNi-layered double hydroxide (LDH) precursor transformation process. The CoNiS@CFs electrode exhibits largely enhanced supercapacitor performance with a specific capacitance of 1724 F/g at 1 A/g, in comparison with that of the CoNi-LDH (1302 F/g) precursor. Furthermore, the CoNiS@CF electrode shows an extremely high rate capability with capacity retention of 79% under a charge density of 60 A/g, whereas the retention rate of CoNi-LDH@CFs is only ∼34%. The abundant pore structure, improved electrical conductivity, and lower internal resistances of CoNiS@CFs (1.0 Ω) compared to those of CoNi-LDH@CFs (9.5 Ω) are responsible for the enhancement of energy storage performance. By using the CoNiS nanoplate array as the positive electrode, an all-solid-state asymmetric fiber-shaped supercapacitor was further obtained, which exhibits outstanding flexible, foldable, and wearable capability. In view of the component tunability for LDH materials, the hydroxide precursor transformation method with merits of mild conditions and easy operation can be extended to the synthesis of a variety of metal sulfides for broad applications in electronic devices.
通过水热法，经由钴镍层状双氢氧化物（LDH）前驱体转化过程，在碳纤维（CFs）上原位合成了高质量的多孔CoNiS纳米片阵列。与CoNi-LDH（1302 F/g）前驱体相比，CoNiS@CFs电极展现出大幅增强的超级电容器性能，在1 A/g电流密度下比电容为1724 F/g。此外，CoNiS@CF电极显示出极高的倍率性能，在60 A/g的电荷密度下容量保持率为79%，而CoNi-LDH@CFs的保持率仅约为34%。与CoNi-LDH@CFs（9.5 Ω）相比，CoNiS@CFs丰富的孔结构、改善的电导率以及更低的内阻（1.0 Ω）是储能性能增强的原因。以CoNiS纳米片阵列作为正极，进一步制备了全固态非对称纤维状超级电容器，其展现出优异的柔性、可折叠和可穿戴性能。鉴于LDH材料的成分可调性，这种条件温和且操作简便的氢氧化物前驱体转化方法可扩展到多种金属硫化物的合成，以在电子器件中广泛应用。
