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Updated: May 25, 2025
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
Published on: April 16, 2018
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Blocking Effect Retards Electron Release from Asymmetric Active Units for Selective Seawater Oxidation.
Zhipeng Li1, Huimin Mao1,2, Xiaobin Liu1
1Key Laboratory of Eco-Chemical Engineering, International Science and Technology Cooperation Base of Eco-Chemical Engineering and Green Manufacturing, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
ACS Nano
|February 26, 2025
Summary
This study introduces oxygen vacancies in Nb-O-Ni bonds to stabilize oxygen evolution reaction (OER) electrocatalysts in seawater electrolysis, improving hydrogen production efficiency and durability.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Seawater electrolysis faces challenges from chloride oxidation and Ni-based electrocatalyst degradation.
- Oxygen evolution reaction (OER) stability is crucial for efficient hydrogen production.
Purpose of the Study:
- To design a novel electrocatalyst for selective seawater oxidation.
- To enhance the stability and activity of Ni-based OER electrocatalysts in alkaline seawater.
Main Methods:
- Fabrication of oxygen-vacancy-regulated asymmetric Nb-O-Ni bonds.
- In situ characterization and density functional theory (DFT) calculations.
- Testing in an anion exchange membrane electrolysis cell.
Main Results:
- Oxygen vacancies effectively stabilize Ni-O bonds, preventing overoxidation and chloride oxidation.
- Optimized adsorption of intermediates and disrupted scaling relationships for OER.
- Achieved cost-efficient hydrogen production ($1.07/GGE) and 100-hour stability at 500 mA cm⁻².
Conclusions:
- The developed Nb-O-Ni catalyst demonstrates superior stability and selectivity for OER in seawater.
- This approach offers a promising strategy for durable hydrogen production via seawater electrolysis.
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