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Key Words:Nickel compounds;Electrodes - Iron compounds - Nanoneedles - Nanosheets - Nanowires - Silicon carbide - Silicon compounds - Supercapacitor;Asymmetric supercapacitor - High-energy - Nanoneedle arrays - Nanosheet arrays - SiC nanowire

Abstract:In this paper, a novel freestanding core-branch negative and positive electrode material through integrating trim aligned Fe<inf>2</inf>O<inf>3</inf>nanoneedle arrays (Fe<inf>2</inf>O<inf>3</inf>NNAs) is first proposed with typical mesoporous structures and NiCo<inf>2</inf>O<inf>4</inf>/Ni(OH)<inf>2</inf>hybrid nanosheet arrays (NiCo<inf>2</inf>O<inf>4</inf>/Ni(OH)<inf>2</inf>HNAs) on SiC nanowire (SiC NW) skeletons with outstanding resistance to oxidation and corrosion, good conductivity, and large-specific surface area. The original built SiC NWs@Fe<inf>2</inf>O<inf>3</inf>NNAs is validated to be a highly capacitive negative electrode (721 F g⁻¹at 2 A g⁻¹, i.e., 1 F cm⁻²at 2.8 mA cm⁻²), matching well with the similarly constructed SiC NWs@NiCo<inf>2</inf>O<inf>4</inf>/Ni(OH)<inf>2</inf>HNAs positive electrode (2580 F g⁻¹at 4 A g⁻¹, i.e., 3.12 F cm⁻²at 4.8 mA cm⁻²). Contributed by the uniquely engineered electrodes, a high-performance asymmetric supercapacitor (ASC) is developed, which can exhibit a maximum energy density of 103 W h kg⁻¹at a power density of 3.5 kW kg⁻¹, even when charging the device within 6.5 s, the energy density can still maintain as high as 45 W h kg⁻¹at 26.1 kW kg⁻¹, and the ASC manifests long cycling lifespan with 86.6% capacitance retention even after 5000 cycles. This pioneering work not only offers an attractive strategy for rational construction of high-performance SiC NW-based nanostructured electrodes materials, but also provides a fresh route for manufacturing next-generation high-energy storage and conversion systems.<br/> © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Volume:8

Issue:12

Translation or Not:no

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