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Surface Cladding Engineering via Oxygen Sulfur Distribution for Stable Electrocatalytic Oxygen Production.
Shengjie Zi1, Jiamin Zhu1, Yue Zhai1
1State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Frontiers Science Center for Rare Isotopes Lanzhou University, 730000, Lanzhou, China.
This study introduces a surface cladding strategy using NiO/NiS heterostructures to prevent catalyst corrosion and Ni leaching during oxygen production. The innovative approach enhances catalyst stability and longevity for anodic oxidation reactions.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Catalyst instability, specifically Ni dissolution and lattice oxygen involvement, limits the lifespan of electrocatalysts for oxygen production.
- Anodic oxidative environments exacerbate leaching and corrosion, hindering catalyst performance and durability.
Purpose of the Study:
- To develop a surface cladding strategy to mitigate Ni dissolution and stabilize lattice oxygen in catalysts.
- To enhance the corrosion resistance and long-term stability of electrocatalysts for oxygen evolution reactions.
Main Methods:
- Constructing a cladding-type NiO/NiS heterostructure with controlled surface thickness.
- Utilizing Fick's Law principles and in situ characterization techniques.
- Employing density functional theory (DFT) calculations to understand interfacial electronic interactions.
Main Results:
- The NiO/NiS heterostructure effectively prevented irreversible Ni ion leaching and inhibited lattice oxygen participation in the anodic reaction.
- DFT calculations revealed a stable O-Ni-S arrangement facilitating electron accumulation and weakening Ni-O covalency, suppressing overoxidation.
- The cladding strategy boosted corrosion resistance without sacrificing catalytic activity, achieving a low overpotential of 256 mV after 500 hours.
Conclusions:
- Surface modification via NiO/NiS heterostructure cladding is an effective strategy to enhance catalyst stability for anodic oxidation.
- Precisely adjusting the oxygen-sulfur exchange process through surface modification improves catalyst durability.
- This work presents an innovative approach to address the instability issues in anodic oxidation catalysts.
