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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
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Ru0.1Mn0.9Ox Electrocatalyst for Durable Oxygen Evolution in Acid Seawater
Jun Xu1, Chun-Chuan Kao1, Haifeng Shen1
1School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
Angewandte Chemie (International Ed. in English)
|November 24, 2024
Summary
A novel non-precious ruthenium-manganese oxide anode enables highly selective and stable oxygen evolution in acidic seawater electrolysis, overcoming ion precipitation challenges for green hydrogen production.
Area of Science:
- Electrochemistry
- Materials Science
- Green Chemistry
Background:
- Direct seawater electrolysis for green hydrogen is hindered by ion precipitation in neutral/alkaline systems.
- Acidic systems offer a solution but require highly selective and stable anodes due to competing chlorine evolution reactions (CER).
- Ruthenium/Iridium-based catalysts, while active, also promote CER, necessitating alternative anode materials.
Purpose of the Study:
- To develop a non-precious metal anode for direct acid seawater electrolysis.
- To achieve high oxygen evolution reaction (OER) selectivity and long-term stability.
- To understand the catalytic mechanism for selective OER in the presence of chloride ions.
Main Methods:
- Synthesis and characterization of a non-precious Ru0.1Mn0.9Ox anode material.
- Electrochemical testing of the anode in acidic seawater for OER and CER.
- In-situ mechanistic studies to elucidate the role of chloride ions and active sites.
Main Results:
- The Ru0.1Mn0.9Ox anode demonstrated high OER selectivity and remarkable stability exceeding 1200 hours.
- Chloride ions occupied Ru sites, shifting the OER active center to Mn and preventing Ru dissolution.
- Mn sites, activated by Ru, facilitated *OH adsorption, creating an OER-favored environment that suppressed CER.
Conclusions:
- A strategy utilizing chloride-assisted transfer of active sites to CER-insensitive Mn was developed.
- This approach enables highly selective and durable oxygen evolution in acidic seawater electrolysis.
- The Ru0.1Mn0.9Ox anode represents a promising advancement for green hydrogen production from seawater.
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