کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4762843 | 1422947 | 2018 | 9 صفحه PDF | دانلود رایگان |
- Porous NiCo2S4 aerogels with high surface and pore volume have been synthesized.
- High specific capacitance (up to 1268Â F/g) has been achieved.
- Low overpotential and high activity towards oxygen evolution have been observed.
We report the synthesis of porous NiCo2S4 and NiCo2S4-reduced graphene oxide composite aerogel with high surface area (up to 262.4Â m2/g) and large pore volume (up to 1.44Â cm3/g). The aerogel is prepared by “DL-Mercaptosuccinic acid accelerated” sol-gel method, which is different from the well-established “nanoparticle condensation” and “metathesis” methods in terms of precursors and reaction mechanism. The fundamental of such method relies on the dual functionality of DL-Mercaptosuccinic acid, which not only initiated the sol-gel transition, but also offered sulfur source for metal sulfide. The complex interactions between the functional groups (COOH, -SH etc.) in DL-Mercaptosuccinic acid and the metal ions yield robust gel networks. After supercritical drying in ethanol, well crystallized monolithic NiCo2S4 and NiCo2S4-reduced graphene oxide aerogel can be obtained. High specific capacitance of 1268Â F/g at 1Â A/g and high energy density of 13.4Â Wh/kg at the power density of 0.75Â kW/kg can be achieved when the aerogel is used as supercapacitor electrode. The low on-set overpotential of 250Â mV and small Tafel slope of 70Â mV/dec also confirmed the aerogel is good catalyst for electrochemical oxygen evolution reaction.
Journal: Chemical Engineering Journal - Volume 331, 1 January 2018, Pages 185-193