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Nanoengineered Cobalt Electrocatalyst for Alkaline Oxygen Evolution Reaction.

Venkatachalam Rajagopal1, Sunil Mehla1, Lathe A Jones1

  • 1Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, STEM College, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.

Nanomaterials (Basel, Switzerland)
|June 13, 2024
PubMed
Summary
This summary is machine-generated.

Highly efficient cobalt electrocatalysts were synthesized for the alkaline oxygen evolution reaction (OER) using a dynamic hydrogen bubble templating (DHBT) method. This approach facilitates green hydrogen production by overcoming OER bottlenecks with improved catalytic performance.

Keywords:
cobaltelectrocatalysthydrogen bubble templatingoxygen evolution reactionwater electrolysis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The alkaline oxygen evolution reaction (OER) is crucial for green hydrogen production but is hindered by slow kinetics and low efficiency of earth-abundant catalysts.
  • Developing efficient electrocatalysts is essential to overcome these limitations.

Purpose of the Study:

  • To investigate the OER performance of hierarchically porous cobalt electrocatalysts synthesized via the dynamic hydrogen bubble templating (DHBT) method.
  • To establish a facile and cost-effective synthesis route for high-performance OER electrocatalysts.

Main Methods:

  • Synthesis of hierarchically porous cobalt electrocatalysts using the DHBT method.
  • Electrochemical characterization including overpotential, Tafel slope, and long-term stability tests.
  • Material characterization using X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy.

Main Results:

  • Optimized DHBT synthesis yielded cobalt nanosheets with hierarchical macroporous and mesoporous structures.
  • Predominant surface species identified as Co(OH)2 by XPS, with cubic Co3O4 phase confirmed by Raman spectroscopy.
  • The best electrocatalyst achieved 10 mA cm-2 at 360 mV overpotential with a 37 mV dec-1 Tafel slope and 24-hour stability.

Conclusions:

  • The DHBT method provides a rapid, low-cost, and facile approach for synthesizing highly efficient cobalt electrocatalysts for alkaline OER.
  • These findings contribute to advancing efficient electrocatalyst development for green hydrogen production.