Oxygen evolution reaction enhancement of copper electrodes in alkaline medium using ultrafast femtosecond laser structuring

Shahbaz Ahmad, M. Egilmez, Arunachala M. Kannan, A. S. Alnaser

Research output: Contribution to journalArticlepeer-review

Abstract

In the pursuit of enhancing the oxygen evolution reaction (OER) activity, we employed femtosecond (FS) laser-induced surface nano-structuring to extend the surface area of copper (Cu) electrodes. Compelling surface hierarchical microstructures have been generated on the electrode surface using this approach. By optimizing the laser processing parameters, regular arrays of conical microstructures are fully covered by a thick and porous layer of Cu2O. Electrochemical measurements reveal that FS laser structuring developed large and structure-tunable surface areas with relative roughness factor between 51 and 61. The enhanced surface area and FS laser-induced Cu2O layers significantly enhanced the OER activity leading to a reduced overpotential (η10 = 345 mV) that is 70% less than that of pristine Cu at a current density of 10 mA cm−2. The results demonstrate the effectiveness of femtosecond laser-based surface structuring in enhancing the electrocatalytic OER activity of Cu electrodes in alkaline media.

Original languageEnglish (US)
JournalInternational Journal of Hydrogen Energy
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Keywords

  • Cu electrodes
  • Femtosecond laser
  • Nanostructuring
  • Oxygen evolution reaction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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