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Trimetallic Oxyhydroxide Coralloids for Efficient Oxygen Evolution Electrocatalysis.

Yecan Pi1, Qi Shao1, Pengtang Wang1

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.

Angewandte Chemie (International Ed. in English)
|March 22, 2017
PubMed
Summary
This summary is machine-generated.

Tungsten-cobalt-iron oxyhydroxides efficiently catalyze the oxygen evolution reaction for water splitting. Optimized catalysts on nickel foam show excellent performance and stability, with iron content crucial for enhanced activity.

Keywords:
coralloid structureselectrocatalysisoxygen evolutiontrimetallic oxyhydroxides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is critical for water splitting but requires efficient catalysts.
  • Trimetallic oxyhydroxides show promise for OER catalysis.

Purpose of the Study:

  • To develop a facile method for growing trimetallic oxyhydroxides on various substrates.
  • To investigate the effect of iron content on the electrocatalytic activity of WCoFe oxyhydroxides for OER.

Main Methods:

  • Facile wet-chemical synthesis of trimetallic oxyhydroxides on nickel foam (NF) and carbon nanotubes (CNTs).
  • Precise control over iron content in the oxyhydroxide structures.
  • Electrochemical characterization including overpotential and Tafel slope measurements.
  • Stability testing over extended periods.
  • X-ray photoelectron spectroscopy (XPS) for surface analysis.

Main Results:

  • Coralloid trimetallic oxyhydroxides were successfully grown on NF and CNTs.
  • OER activity exhibited a volcano-shaped dependence on iron concentration.
  • Optimized W0.5Co0.4Fe0.1/NF catalyst achieved an overpotential of 310 mV at 100 mA cm⁻² with a Tafel slope of 32 mV dec⁻¹.
  • The catalyst demonstrated excellent stability for over 500 hours (>21 days).
  • Fe addition lowered the average cobalt oxidation state, enhancing OER performance.

Conclusions:

  • A scalable wet-chemical method enables the synthesis of tunable trimetallic oxyhydroxides for OER.
  • Iron plays a critical role in optimizing the electrocatalytic activity and stability of WCoFe oxyhydroxides.
  • These materials represent promising catalysts for efficient water splitting applications.