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Intercalated Iridium Diselenide Electrocatalysts for Efficient pH-Universal Water Splitting.
Tingting Zheng1, Chunyan Shang1, Zhihai He1
1Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Angewandte Chemie (International Ed. in English)
|August 28, 2019
Summary
A novel lithium-intercalated iridium diselenide (Li-IrSe2) catalyst efficiently splits water in acidic and neutral conditions. This bifunctional catalyst offers record-low cell voltages for practical electrocatalytic water splitting applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrocatalytic water splitting is crucial for clean energy production.
- Bifunctional catalysts are needed for efficient hydrogen and oxygen evolution reactions.
- Existing catalysts often perform poorly in acidic or neutral media, limiting industrial applications.
Purpose of the Study:
- To develop a novel bifunctional catalyst for overall water splitting.
- To achieve high catalytic activity in acidic and neutral environments.
- To overcome the limitations of current catalysts in non-alkaline media.
Main Methods:
- Synthesis of lithium-intercalated iridium diselenide (Li-IrSe2).
- Characterization of the catalyst's structural and electrochemical properties.
- Assembly of Li-IrSe2 into two-electrode electrolyzers for overall water splitting tests.
Main Results:
- Li-IrSe2 exhibited superior performance for both hydrogen and oxygen evolution reactions compared to other catalysts.
- Li intercalation enhanced porosity and created selenium vacancies, boosting catalytic activity.
- Record-low cell voltages of 1.44 V (pH 0) and 1.50 V (pH 7) at 10 mA cm-2 were achieved for overall water splitting.
Conclusions:
- Li-IrSe2 is a highly effective bifunctional catalyst for overall water splitting in acidic and neutral media.
- The developed catalyst demonstrates significant potential for industrial applications in electrocatalytic water splitting.
- This work presents a promising strategy for designing advanced catalysts for clean energy technologies.
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