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Porous and nanowire-structured NiO/AgNWs composite electrodes for significantly-enhanced supercapacitive and
Mingang Zhang1, Xiangdong Xu1, Yu Gu1
1State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, People's Republic of China.
Abstract:
NiO/AgNWs composite films which specially contain both porous and one-dimensional (1D) nanowire structures are prepared uniformly via a simple chemical bath deposition method. The supercapacitive electrodes constructed by the as-prepared NiO/AgNWs composite films exhibit a high specific capacitance (980 F g-1at 1 A g-1), much higher than that of the pure NiO films. Particularly, a large optical modulation (84.3% at 550 nm) and short switching times for the coloration and bleaching (5.4 and 6.5 s) are also observed if these NiO/AgNWs films serve as the electrochromic materials. The superior capacitive and electrochromic properties of the NiO/AgNWs composite films are attributed to the large electrochemically effective surface areas and enhanced conductivity induced by the addition of 1D AgNWs, which efficiently shorten the ions/electrons diffusion paths and accelerate the reversible redox reactions. Therefore, the NiO/AgNWs composite films hold a great potential for applications as a novel electrode material in supercapacitive and electrochromic devices.
