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Controlled Growth of NiMoO 4 Nanosheet and Nanorod Arrays on Various Conductive Substrates as Advanced Electrodes for Asymmetric Supercapacitors
Author(s) -
Peng Shengjie,
Li Linlin,
Wu Hao Bin,
Madhavi Srinivasan,
Lou Xiong Wen David
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201401172
Subject(s) - supercapacitor , materials science , nanorod , nanosheet , capacitance , electrode , faraday efficiency , nanotechnology , nanostructure , electrochemistry , electrical conductor , chemical engineering , composite material , chemistry , engineering
Hierarchical NiMoO 4 architectures assembled from well‐aligned uniform nanosheets or nanorods are successfully grown on various conductive substrates using a facile and effective general approach. Importantly, the nanostructures of NiMoO 4 can be easily controlled to be nanosheets or nanorods by using different solvents. By virtue of their intriguing structure features, NiMoO 4 nanosheets as integrated additive‐free electrodes for supercapacitors manifest higher Faradaic capacitance than NiMoO 4 nanorods. Moreover, an asymmetric supercapacitor (ASC) is constructed using the as‐prepared NiMoO 4 nanosheets as the positive electrode and activated carbon (AC) as the negative electrode. The optimized ASC with an extended operating voltage range of 0–1.7 V displays excellent electrochemical performance with a high energy density of 60.9 Wh kg −1 at a power density of 850 W kg −1 in addition to superior rate capability. Furthermore, the NiMoO 4 //AC ASC device exhibits remarkable cycling stability with 85.7% specific capacitance retention after 10 000 cycles. The results show that these NiMoO 4 ‐based nanostructures are promising for high‐energy supercapacitors.