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Published on: December 6, 2021
Sea urchin-like cobalt-iron phosphide as an active catalyst for oxygen evolution reaction
Adriana Mendoza-Garcia1, Dong Su2, Shouheng Sun1
1Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA. ssun@brown.edu.
Sea urchin-like cobalt-iron phosphide ((CoxFe1-x)2P) catalysts exhibit composition-dependent oxygen evolution reaction (OER) activity. The optimal (Co0.54Fe0.46)2P catalyst achieves high efficiency for OER electrocatalysis.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- The oxygen evolution reaction (OER) is a critical bottleneck in many electrochemical energy conversion systems.
- Developing efficient and cost-effective OER electrocatalysts is essential for advancing technologies like water splitting and metal-air batteries.
Purpose of the Study:
- To investigate the electrocatalytic performance of sea urchin-like cobalt-iron phosphide ((CoxFe1-x)2P) for the oxygen evolution reaction (OER).
- To explore the effect of cobalt-to-iron composition on the OER activity of (CoxFe1-x)2P.
- To identify the optimal composition for enhanced OER electrocatalysis.
Main Methods:
- Synthesis of sea urchin-like (CoxFe1-x)2P nanostructures with varying Co/Fe ratios.
- Electrochemical characterization of the synthesized catalysts in 0.1 M KOH.
- Evaluation of OER activity through techniques such as linear sweep voltammetry and electrochemical impedance spectroscopy.
Main Results:
- The (CoxFe1-x)2P catalysts demonstrated a clear dependence of OER activity on the Co/Fe composition.
- The (Co0.54Fe0.46)2P composition exhibited the highest catalytic efficiency, achieving a current density of 10 mA cm(-2) at a low overpotential of 0.37 V versus the reversible hydrogen electrode (RHE).
- The unique sea urchin-like morphology likely contributes to the enhanced catalytic performance.
Conclusions:
- Cobalt-iron phosphides are promising electrocatalysts for the oxygen evolution reaction.
- Tuning the Co/Fe composition in (CoxFe1-x)2P provides a synergistic approach to optimize OER electrocatalysis.
- The findings offer a new pathway for designing highly efficient OER catalysts for energy applications.
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