@article{Yang2018, 
author = {Jiao Yang and Wei Liu and Hao Niu and Kui Cheng and Ke Ye and Kai Zhu and Guiling Wang and Dianxue Cao and Jun Yan},
title = {Ultrahigh energy density battery-type asymmetric supercapacitors: NiMoO4 nanorod-decorated graphene and graphene/Fe2O3 quantum dots},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {9},
pages = {4744-4758},
keywords = {NiMoO4, graphene, supercapacitor, energy density},
url = {https://www.sciopen.com/article/10.1007/s12274-018-2059-z},
doi = {10.1007/s12274-018-2059-z},
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.}
}