One-step synthesis of Ni 3 S 2 nanoplatelets on graphene for high performance supercapacitors

• Published in: RSC advances 2016, Vol.6 (13), p.10280-10284
• Main Authors: Ou, Xuewu, Luo, Zhengtang
• Format: Article
• Language: English
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C5RA22426H

Here, we present a one-step hydrogen reduction synthesis of Ni 3 S 2 nanoplatelets on graphene surface by using NiSO 4 ·3N 2 H 4 /GO as precursor. In this process, we have demonstrated that hydrazine molecule, which can coordinate with NiSO 4 in the form of pink precipitation, not only contributes to the formation of Ni 3 S 2 nanoplatelets structure, but also enhances the efficiency of SO 4 2− to S 2 4− conversion compared with NiSO 4 /GO. Supercapacitors made from the obtained Ni 3 S 2 /rGO composite exhibits a specific capacitance of 912.2 F g −1 at 2 mV s −1 scanning rate, and 875.6 F g −1 at galvanostatic discharge current density of 1 A g −1 , along with exceptional rate capability of 83.2% at discharge current density from 1 A g −1 to 10 A g −1 as well as good cycling stability. We attribute the excellent performance from the improved contact between graphene and the planar Ni 3 S 2 structure, which strengthens the synergistic effect with graphene as conductive support and Ni 3 S 2 nanoplatelets as the pseudocapacitive materials. This method allows the direct and efficient preparation of Ni 3 S 2 , and provides a simple route to integrate them with graphene for energy storage applications.