期刊
CHEMICAL ENGINEERING JOURNAL
卷 331, 期 -, 页码 185-193出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.08.067
关键词
Porous materials; Metal sulfide aerogel; Sol-gel; Supercapacitor; Oxygen evolution catalyst
资金
- National key research and development program [2016YFB0901600]
- NSFC [21303162, 11604295]
We report the synthesis of porous NiCo2S4 and NiCo2S4-reduced graphene oxide composite aerogel with high surface area (up to 262.4 m(2)/g) and large pore volume (up to 1.44 cm(3)/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 1268 F/g at 1 A/g and high energy density of 13.4 Wh/kg at the power density of 0.75 kW/kg can be achieved when the aerogel is used as supercapacitor electrode. The low onset overpotential of 250 mV and small Tafel slope of 70 mV/dec also confirmed the aerogel is good catalyst for electrochemical oxygen evolution reaction.
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