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Updated: Feb 13, 2026

Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
Published on: February 28, 2014
Cobalt sulfide aerogel prepared by anion exchange method with enhanced pseudocapacitive and water oxidation
Qiuyue Gao1, Zhenyu Shi1, Kaiming Xue1
1State Key Laboratory of Silicon Material, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People's Republic of China.
Abstract:
This work introduces the anion exchange method into the sol-gel process for the first time to prepare a metal sulfide aerogel. A porous Co9S8 aerogel with a high surface area (274.2 m2 g-1) and large pore volume (0.87 cm3 g-1) has been successfully prepared by exchanging cobalt citrate wet gel in thioacetamide and subsequently drying in supercritical ethanol. Such a Co9S8 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-1 at 1 A g-1), good rate capability (74.3% capacitance retention from 1 to 20 A g-1) and low onset overpotential for OER (220 mV) were observed. The results demonstrated here have implications in preparing various sulfide chalcogels.
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