Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 7, Pages 5964-5971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00758
Keywords
NiMoO4; Carbon; Ni foam; Integrated electrode; Supercapacitor
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Funding
- National Natural Science Foundation of China [51402362, 21471160]
- Shandong Natural Science Foundation [ZR2014EMQ012, ZR2016BM12]
- Fundamental Research Funds for the Central Universities [16CX05016A, 15CX05045A, 15CX08010A]
- TJUT
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Rational design of hierarchical nanostructure arrays as integrated electrodes with the capability of storing energy has been studied extensively. However, a low electronic/ionic transport rate and structural instability hampered their practical application. In this study, we have fabricated carbon-sheathed NiMoO4 nanowires standing on nickel foam (NF) and employed as a free-standing electrode for supercapacitor. The unique structure revealed remarkable electrochemical behavior including a high areal capacitance, similar to 70% capacitance retention at 100 mA cm(-2), and an stability during cycling (86% retention after 50,000 cycles). In addition, an NF@NiMoO4@C//activated carbon hybrid supercapacitor presents 201.3 F g(-1) of specific capacitance along with an 72.4 W h kg(-1) of energy density. The carbon sheath, which prevents the structural pulverization of NiMoO4 and provides another conductive path together with Ni foam, is responsible for the superior electrochemical performances. Our work demonstrates an improved step toward rational design of high-performance integrated electrodes for a supercapacitor with a new vision for theoretical and practical applications.
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