期刊
SMALL
卷 10, 期 14, 页码 2937-2945出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201302937
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资金
- Singapore National Research Foundation under NRF RF [NRF-RF2010-07]
- MOE under AcRF Tier 2 [ARC 10/10, MOE2010-T2-1-060]
- MOE under AcRF Tier 1 [RG 61/12]
- MOE [M4080865.070.706022]
- National Research Foundation under the Campus for Research Excellence and Technological Enterprise (CREATE)
The electrochemical performance of supercapacitors relies not only on the exploitation of high-capacity active materials, but also on the rational design of superior electrode architectures. Herein, a novel supercapacitor electrode comprising 3D hierarchical mixed-oxide nanostructured arrays (NAs) of C/CoNi3O4 is reported. The network-like C/CoNi3O4 NAs exhibit a relatively high specific surface area; it is fabricated from ultra-robust Co-Ni hydroxide carbonate precursors through glucose-coating and calcination processes. Thanks to their interconnected three-dimensionally arrayed architecture and mesoporous nature, the C/CoNi3O4 NA electrode exhibits a large specific capacitance of 1299 F/g and a superior rate performance, demonstrating 78% capacity retention even when the discharge current jumps by 100 times. An optimized asymmetric supercapacitor with the C/CoNi3O4 NAs as the positive electrode is fabricated. This asymmetric supercapacitor can reversibly cycle at a high potential of 1.8 V, showing excellent cycling durability and also enabling a remarkable power density of similar to 13 kW/kg with a high energy density of similar to 19.2 W h/kg. Two such supercapacitors linked in series can simultaneously power four distinct light-emitting diode indicators; they can also drive the motor of remote-controlled model planes. This work not only presents the potential of C/CoNi3O4 NAs in thin-film supercapacitor applications, but it also demonstrates the superiority of electrodes with such a 3D hierarchical architecture.
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