Title: Low Cost Facile Synthesis of Large-Area Cobalt Hydroxide Nanorods with Remarkable Pseudocapacitance
Authors: Deng, Ming-Jay
Song, Cheng-Zhao
Wang, Chien-Chia
Tseng, Yuan-Chieh
Chen, Jin-Ming
Lu, Kueih-Tzu
Department of Materials Science and Engineering
Keywords: cobalt hydroxide;symmetric supercapacitor;nanotube;nanoporous
Issue Date: 6-May-2015
Abstract: Large-area Co(OH)(2)-based supercapacitor electrodes composed of nanotube arrays grown on a 3D nickel-foam (CONTA) electrode and sucker-like nanoporous films grown on a 3D nickel-foam (COSNP) electrode were prepared with a facile electrochemical method for applications in energy storage. These nanoporous Co(OH)(2) electrodes were fabricated with the codeposition of Cu/Ni film on the nickel foam, then etching of Cu from the Cu/Ni layer to form Ni nanotube arrays and sucker-like Ni nanoporous layers, and further cathodic deposition of Co(OH)(2) on the prepared nanoporous Ni substrates. The CONTA and COSNP electrodes exhibited specific capacitances of 2500 and 2900 F/g in a voltage range of 0.65 V (capacitance of the substrates deducted from the total) at 1 A/g in a three electrode cell, respectively. The COSNP electrode demonstrated an excellent supercapacitive performance with specific capacitances 1100 F/g at 1 A/g and 850 F/g at 20 A/g in a voltage range of 1.2 V in a two electrode cell. The remarkable performance of COSNP electrodes correlated with a large conversion of the Co oxidation state during the charge/discharge cycling were examined by in situ X-ray absorption near edge structure (XANES).
URI: http://dx.doi.org/10.1021/acsami.5b01163
ISSN: 1944-8244
DOI: 10.1021/acsami.5b01163
Issue: 17
Begin Page: 9147
End Page: 9156
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