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Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO3 for Acidic Overall Water Splitting
Ling Zhao1,2, Zetian Tao3, Maosheng You2
1School of Marine Science and Engineering, Hainan University, Haikou, 570228, P. R China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 2, 2024
Summary
A novel Ir@SrIrO3 heterojunction electrocatalyst was developed for efficient overall water splitting. This bifunctional catalyst shows excellent performance and durability in acidic media, paving the way for advanced water electrolysis.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient and durable bifunctional electrocatalysts are crucial for overall water splitting in acidic media.
- Strontium iridate (SrIrO3) perovskites show activity for oxygen evolution reaction (OER) but lack activity for hydrogen evolution reaction (HER).
- This limits their application in practical overall water splitting systems.
Purpose of the Study:
- To develop a novel bifunctional electrocatalyst for overall water splitting.
- To enhance the activity and durability of SrIrO3-based materials for both OER and HER in acidic conditions.
- To investigate the structure-property relationship of the new catalyst.
Main Methods:
- Fabrication of an Ir@SrIrO3 heterojunction via a partial exsolution approach.
- Annealing SrIrO3 in a 5% H2 atmosphere at 175 °C to prepare the Ir@SrIrO3-175 electrocatalyst.
- Electrochemical characterization including overpotential measurements for OER and HER.
- Fabrication and testing of a water electrolyzer using the developed catalyst.
- Theoretical calculations to understand the electronic structure and reaction mechanisms.
Main Results:
- The Ir@SrIrO3-175 electrocatalyst exhibited ultralow overpotentials: 229 mV for OER and 28 mV for HER at 10 mA cm−2.
- The catalyst demonstrated superior bifunctional activity, outperforming most previously reported electrocatalysts.
- A water electrolyzer utilizing Ir@SrIrO3-175 showed high electrochemical performance and excellent durability in acidic environments.
- Theoretical calculations confirmed that the heterojunction structure facilitates electronic redistribution, lowering energy barriers for both reactions.
Conclusions:
- The developed Ir@SrIrO3 heterojunction is a highly efficient and durable bifunctional electrocatalyst for overall water splitting in acidic media.
- The strong metal-support interaction and regulated interfacial electronic structure are key to its enhanced catalytic activity.
- This work presents a promising strategy for designing advanced electrocatalysts for clean energy applications.
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