Fabrication of large-scale nanoporous nickel with a tunable pore size for energy storage

H. J. Qiu, J. L. Kang, P. Liu, A. Hirata, T. Fujita, M. W. Chen

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

Nanoporous Ni with a tunable nanopore size and chemical compositions was fabricated by dealloying a Ni30Mn70 precursor alloy at various temperatures. The influence of electrochemical parameters on the formation of large-scale nanoporous Ni was systematically investigated. Different from the fabrication of nanoporous noble metals (Au, Pt and Pd), the dealloying of Ni30Mn70 includes three kinetically competitive processes: dissolution of Mn, interface diffusion of Ni and dissolution of Ni. The nanopore size and residual Mn can be tailored by controlling the dealloying time, temperature and applied potential. The as-dealloyed nanoporous Ni with a large internal surface area, excellent conductivity and naturally formed oxide surface can be directly used as a free-standing electrode for electrochemical supercapacitors with a high capacitance and excellent cycling stability.

Original languageEnglish
Pages (from-to)896-905
Number of pages10
JournalJournal of Power Sources
Volume247
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Dealloying
  • Free-standing
  • Nanoporous nickel
  • Supercapacitor

ASJC Scopus subject areas

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

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