Tailoring rGO-NiFe2O4 hybrids to tune transport of electrons and ions for supercapacitor electrodes

Yong Zhu Cai, Wen Qiang Cao, Yan Lan Zhang, Peng He, Jin Cheng Shu, Mao Sheng Cao*

*此作品的通讯作者

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89 引用 (Scopus)

摘要

Spinel transition metal oxide is a promising pseudocapacitive materials but the instability gives it narrow practical application. It is shown herein, that an effective remedy for these problems can be achieved by introducing highly conductive two dimensional (2D) reduced graphene oxide (rGO) substrate on which NiFe2O4 nanoparticles are well distributed. The rGO-NiFe2O4 hybrids with different NiFe2O4 contents were tailored to explore the source of the improvement in capacitance performance. It is found that rGO nanosheets in the hybrid can be used as a conductive substrate to accelerate the electron transport. Moreover, NiFe2O4 nanoparticles with a certain volume can simultaneously prevent the restacking of rGO and increase the pseudocapacitance. The G-N3 (30 wt% NiFe2O4) hybrid holds enhanced specific capacitance up to 210.9 F g−1 at 0.5 A g−1 far above that of pristine NiFe2O4 (50 F g−1), and exhibits superior cycle stability with no obvious capacity loss even after 5000 cycles. This research indicates that a tailoring method can promote the electrochemical performance of NiFe2O4, and hopefully accelerate the commercialization of spinel transition metal oxides as electrode materials for supercapacitor.

源语言英语
文章编号152011
期刊Journal of Alloys and Compounds
811
DOI
出版状态已出版 - 30 11月 2019

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