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Improved pseudocapacitive performance and cycle life of cobalt hydroxide on an electrochemically derived nano-porous Ni framework |
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| Authors: | Chih-Ming WuChen-Yen Fan I-Wen SunWen-Ta Tsai Jeng-Kuei Chang |
| Affiliation: | a Department of Chemistry, National Cheng Kung University, 1 University Road, Tainan City, Taiwan b Institute of Materials Science and Engineering, National Central University, 300 Jhongda Road, Taoyuan County, Taiwan c Department of Materials Science and Engineering, National Cheng Kung University, 1 University Road, Tainan City, Taiwan |
| Abstract: | The pseudocapacitance and morphology of an electrodeposited cobalt hydroxide (Co(OH)2) significantly depends on the architecture of the electrode substrate. The nano-porous Ni framework, derived from the selective dissolution of Cu from a Ni-Cu alloy, effectively promotes the electrochemical utilization of deposited Co(OH)2 even at a high loading amount condition. The great electronic and ionic conduction within the nano-structured electrode improves the energy storage performance of Co(OH)2 as compared to that for a conventional flat Ni substrate. In this work, the Co(OH)2 mass specific capacitance, evaluated using cyclic voltammetry (CV), only slightly decreases from 2650 to 2470 F g−1 when the potential sweep rate is substantially increased from 5 to 200 mV s−1. The developed Ni(OH)2/NiOOH (from the nano-porous framework) incorporates with the deposited Co(OH)2 upon CV cycling; the mixed hydroxide shows a noticeably synergistic capacitance. Furthermore, the dissolution of Co(OH)2 in KOH electrolyte is greatly suppressed due to the incorporation of Ni(OH)2/NiOOH, consequently prolonging the electrode cycle life. |
| Keywords: | Supercapacitor Cobalt hydroxide Nano-porous electrode Energy storage Cyclic stability |
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