Fabrication of Ni nanowires for hydrogen evolution reaction in a neutral electrolyte

Po Chun Chen, Yun Min Chang, Pu-Wei Wu*, Yu Fan Chiu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


Hydrogen evolution reaction in 1 M Na2SO4 was investigated using Ni nanowires in diameter of 250 nm with exposed lengths of 20, 35, and 45 μm, respectively. The Ni nanowires were fabricated by a direct-current pulse electrodeposition technique using an anodic aluminum oxide template, followed by selective removal of the supporting pore walls. Scanning Electron Microscope images revealed structural stabilities and X-ray diffraction pattern indicated a polycrystalline fcc phase. In current-potential (i-V) polarizations, the Ni nanowires with longer exposed lengths demonstrated larger current responses. Analysis from impedance spectroscopy confirmed increasing double-layer capacitances with longer Ni nanowires. In galvanostatic lifetime experiments, the free-standing Ni nanowires exhibited a reduced overpotential over that of supported ones. Similar procedures were performed for the oxygen evolution reaction in both i-V and lifetime measurements. For the Ni nanowires of 45 μm length, we estimated the energy cost for hydrogen production was 5.24 × 105 J/mole.

Original languageEnglish
Pages (from-to)6596-6602
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number16
StatePublished - 1 Aug 2009


  • Hydrogen evolution reaction
  • Neutral electrolyte
  • Ni nanowires
  • Template synthesis

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