Gao Qiuyue, Shi Zhenyu, Xue Kaiming, Ye Ziran, Hong Zhanglian, Yu Xinyao, Zhi Mingjia
State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People's Republic of China.
Nanotechnology. 2018 May 25;29(21):215601. doi: 10.1088/1361-6528/aab299. Epub 2018 Feb 27.
This work introduces the anion exchange method into the sol-gel process for the first time to prepare a metal sulfide aerogel. A porous CoS aerogel with a high surface area (274.2 m g) and large pore volume (0.87 cm g) has been successfully prepared by exchanging cobalt citrate wet gel in thioacetamide and subsequently drying in supercritical ethanol. Such a CoS aerogel shows enhanced supercapacitive performance and catalytic activity toward oxygen evolution reaction (OER) compared to its oxide aerogel counterpart. High specific capacitance (950 F g at 1 A g), good rate capability (74.3% capacitance retention from 1 to 20 A g) and low onset overpotential for OER (220 mV) were observed. The results demonstrated here have implications in preparing various sulfide chalcogels.
本工作首次将阴离子交换法引入溶胶 - 凝胶过程以制备金属硫化物气凝胶。通过在硫代乙酰胺中交换柠檬酸钴湿凝胶并随后在超临界乙醇中干燥，成功制备了具有高比表面积（274.2 m²/g）和大孔体积（0.87 cm³/g）的多孔CoS气凝胶。与相应的氧化物气凝胶相比，这种CoS气凝胶表现出增强的超级电容性能和对析氧反应（OER）的催化活性。观察到高比电容（在1 A/g时为950 F/g）、良好的倍率性能（从1到20 A/g电容保持率为74.3%）以及OER的低起始过电位（220 mV）。此处展示的结果对制备各种硫化物硫属凝胶具有启示意义。
