Synthesis Framework for Designing PtPdCoNiMn High-Entropy Alloy: A Stable Electrocatalyst for Enhanced Alkaline
Athira Chandran M1,2, Sudeshna Sahoo1, Ashutosh K Singh1,2,3
1Centre for Nano and Soft Matter Sciences, Bengaluru, 562162, India.
Small (Weinheim an Der Bergstrasse, Germany)
|November 16, 2024
Summary
High entropy alloys (HEAs) offer a promising alternative to platinum catalysts for water splitting. This study details a solvothermal method to synthesize a single-phase PtPdCoNiMn HEA, achieving excellent electrocatalytic performance in alkaline and seawater electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- High entropy alloys (HEAs) are advanced materials with potential in electrocatalysis.
- Current challenges exist in synthesizing single-phase HEAs using bottom-up approaches.
- HEAs offer multifunctionality and synergistic effects beneficial for catalysis.
Purpose of the Study:
- To develop a solvothermal synthesis method for a single-phase platinum-palladium-cobalt-nickel-manganese (PtPdCoNiMn) high entropy alloy (HEA).
- To investigate the critical role of solvent and reducing agent selection in achieving a single-phase HEA.
- To evaluate the electrocatalytic performance of the synthesized HEA for water splitting.
Main Methods:
- Solvothermal synthesis utilizing carefully selected solvents, reducing agents, and capping agents.
- Tuning the relative fractions of synthesis components to control alloy formation.
- Characterization of the synthesized HEA and evaluation of its performance as a hydrogen evolution reaction (HER) catalyst.
Main Results:
- A single-phase PtPdCoNiMn HEA was successfully synthesized by controlling solvothermal conditions.
- The HEA (20 wt.%)/functionalized carbon (FC) catalyst exhibited a low overpotential of 48.7 mV at -10 mA cm⁻² in alkaline solution.
- The catalyst demonstrated high reaction kinetics, stability at high current densities, and effective performance in simulated and actual seawater.
Conclusions:
- The study successfully established a method for bottom-up synthesis of single-phase HEAs.
- The PtPdCoNiMn HEA shows significant promise as a cost-effective and durable electrocatalyst for water splitting, reducing reliance on platinum.
- The developed catalyst exhibits excellent performance in various electrolytes, including seawater, highlighting its practical applicability.
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