Improved pseudocapacitive performance and cycle life of cobalt hydroxide on an electrochemically derived nano-porous Ni framework

Chih Ming Wu, Chen Yen Fan, I. Wen Sun, Wen Ta Tsai, Jeng Kuei Chang

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)7828-7834
Number of pages7
JournalJournal of Power Sources
Volume196
Issue number18
DOIs
Publication statusPublished - 2011 Sep 15

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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