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Sputter-Deposited High Entropy Alloy Thin Film Electrocatalyst for Enhanced Oxygen Evolution Reaction Performance
Siang-Yun Li1, Thi Xuyen Nguyen2, Yen-Hsun Su2
1Department of Resources Engineering, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan.
Small (Weinheim an Der Bergstrasse, Germany)
|August 26, 2022
Summary
Sputtered high entropy alloy (HEA) thin films show superior performance for oxygen evolution reactions (OER) compared to other catalysts. This novel HEA catalyst demonstrates robust activity and stability, advancing future electrocatalyst design.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Thin film catalysts offer morphological advantages over particle catalysts for gas evolution reactions.
- High entropy alloys (HEAs) present a promising class of materials for catalytic applications.
Purpose of the Study:
- To report a novel high entropy alloy (HEA) thin film electrocatalyst for the oxygen evolution reaction (OER) using sputter deposition.
- To investigate the OER performance and stability of the HEA thin film.
- To understand the surface electronic structure modifications and microstructural transformations during OER.
Main Methods:
- Sputter deposition of HEA thin films.
- Electrochemical characterization including OER performance and stability testing.
- Surface electronic structure analysis using experimental and density functional theory (DFT) calculations.
- In-situ investigation of microstructural transformations during OER.
Main Results:
- Sputtered FeNiMoCrAl HEA thin film demonstrated superior OER performance compared to other HEA catalysts.
- The HEA catalyst exhibited a low overpotential of 220 mV at 10 mA cm⁻².
- Excellent electrochemical stability was observed at current densities of 10 and 100 mA cm⁻² for 50 hours.
- Surface electronic structure modifications and microstructural evolution during OER were elucidated.
Conclusions:
- Sputtered HEA thin films are effective electrocatalysts for OER, offering significant advantages in activity and stability.
- Understanding the dynamic microstructural and electronic changes during OER is crucial for HEA catalyst design.
- This work provides insights for developing advanced HEA electrocatalysts for energy conversion applications.
