Ultrathin mesoporous NiCo{sub 2}O{sub 4} nanosheets supported on Ni foam as advanced electrodes for supercapacitors Yuan, Changzhou [Anhui Key Laboratory of Metal Materials and Processing, School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243002 (China)]; School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive (Singapore)]; Li, Jiaoyang; Hou, Linrui [Anhui Key Laboratory of Metal Materials and Processing, School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243002 (China)]; Zhang, Xiaogang; Shen, Laifa [College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 (China)]; Lou, Xiong Wen [School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive (Singapore)] 25 ENERGY STORAGE; 77 NANOSCIENCE AND NANOTECHNOLOGY; FOAMS; ELECTRODES; NICKEL; ELECTRODEPOSITION; CAPACITORS; NICKEL OXIDES; COBALT OXIDES; CAPACITANCE; NANOSTRUCTURES; SHEETS A facile two-step method is developed for large-scale growth of ultrathin mesoporous nickel cobaltite (NiCo{sub 2}O{sub 4}) nanosheets on conductive nickel foam with robust adhesion as a high-performance electrode for electrochemical capacitors. The synthesis involves the co-electrodeposition of a bimetallic (Ni, Co) hydroxide precursor on a Ni foam support and subsequent thermal transformation to spinel mesoporous NiCo{sub 2}O{sub 4}. The as-prepared ultrathin NiCo{sub 2}O{sub 4} nanosheets with the thickness of a few nanometers possess many interparticle mesopores with a size range from 2 to 5 nm. The nickel foam supported ultrathin mesoporous NiCo{sub 2}O{sub 4} nanosheets promise fast electron and ion transport, large electroactive surface area, and excellent structural stability. As a result, superior pseudocapacitive performance is achieved with an ultrahigh specific capacitance of 1450 F g{sup -1}, even at a very high current density of 20 A g{sup -1}, and excellent cycling performance at high rates, suggesting its promising application as an efficient electrode for electrochemical capacitors. (Copyright copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) Available from: http://dx.doi.org/10.1002/adfm.201200994 Germany 2012-11-07 English Journal Article Journal Name: Advanced Functional Materials; Journal Volume: 22; Journal Issue: 21; Other Information: With 4 figs., NA tabs., 29 refs. Medium: X; Size: page(s) 4592-4597 https://doi.org/10.1002/ADFM.201200994 [] 21 22 Journal ID: ISSN 1616-301X; CODEN: AFMDC6; TRN: DE13G2148 DE 2013-04-12 22040697