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Earth-abundant mesoporous cobalt iron oxide inverse opals show promise as efficient bifunctional electrocatalysts for water splitting. These catalysts offer high performance for both oxygen evolution (OER) and hydrogen evolution (HER) reactions in alkaline media.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient hydrogen production via electrochemical water splitting requires earth-abundant, high-performance bifunctional catalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline electrolytes.
  • Developing such catalysts remains a significant challenge in sustainable energy technologies.

Purpose of the Study:

  • To fabricate and evaluate mesoporous cobalt iron oxide inverse opals (m-CFO IO) as bifunctional electrocatalysts for OER and HER.
  • To investigate the effect of cobalt and iron ratios on catalytic performance.

Main Methods:

  • Fabrication of m-CFO IO using a wet chemical method with polystyrene beads as a hard template, followed by calcination.
  • Electrochemical characterization of OER and HER performance using techniques like overpotential and Tafel slope measurements.
  • Testing in an alkaline water electrolyzer with a two-electrode configuration.

Main Results:

  • The m-CFO IO catalyst with equal Fe and Co concentrations demonstrated excellent OER and HER performance.
  • Achieved low overpotentials (261 mV for OER, 157 mV for HER) and small Tafel slopes (63 mV dec-1 for OER, 56 mV dec-1 for HER).
  • An alkaline water electrolyzer using this catalyst reached 10 mA cm-2 at 1.55 V with superior long-term stability compared to IrO2 and Pt/C benchmarks.

Conclusions:

  • The m-CFO IO catalyst exhibits remarkable bifunctional activity for OER and HER.
  • The enhanced performance is attributed to synergistic effects including optimal particle size, crystallinity, oxygen content, numerous active sites, and a high surface area from the porous inverse opal structure.
  • This catalyst represents a promising alternative to noble metal catalysts for efficient electrochemical water splitting.