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- Title
Ultrahigh energy density battery-type asymmetric supercapacitors: NiMoO<sub>4</sub> nanorod-decorated graphene and graphene/Fe<sub>2</sub>O<sub>3</sub> quantum dots.
- Authors
Yang, Jiao; Liu, Wei; Niu, Hao; Cheng, Kui; Ye, Ke; Zhu, Kai; Wang, Guiling; Cao, Dianxue; Yan, Jun
- Abstract
NiMoO4 has attracted intensive attention as one of the promising ternary metal oxides because of its high specific capacitance and electrical conductivity compared to traditional transition-metal oxides. In this study, NiMoO4 nanorods uniformly decorated on graphene nanosheets (G-NiMoO4) are synthesized through a facile hydrothermal method. The prepared G-NiMoO4 composite exhibits a high specific capacitance of 714 C·g−1 at 1 A·g−1 and an excellent rate capability, with a retention ratio of 57.7% even at 100 A·g−1. An asymmetric supercapacitor (ASC) fabricated with the G-NiMoO4 composite as the positive electrode and Fe2O3 quantum dot-decorated graphene (G-Fe2O3-QDs) as the negative electrode delivers an ultrahigh energy density of 130 Wh·kg−1, which is comparable to those of previously reported aqueous NiMoO4-based ASCs. Even when the power density reaches 33.6 kW·kg−1, an energy density of 56 Wh·kg−1 can be maintained. The ASC device exhibits outstanding cycling stability, with a capacitance retention of 113% after 40,000 cycles. These results indicate that the G-NiMoO4 composite is a promising candidate for ASCs with ultrahigh energy density and excellent cycling stability. Moreover, the present work provides an exciting guideline for the future design of high-performance supercapacitors for industrial and consumer applications via the simultaneous use of various pseudocapacitive materials with suitable potential windows as the positive and negative electrodes.<graphic></graphic>
- Publication
Nano Research, 2018, Vol 11, Issue 9, p4744
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-018-2059-z