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Experimentally validating sabatier plot by molecular level microenvironment customization for oxygen electroreduction
Bingyu Huang1,2, Qiao Gu1, Xiannong Tang1
1College of Chemistry and Chemical Engineering/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC), Nanchang University, Nanchang, 330031, PR China.
Nature Communications
|July 19, 2024
Summary
Researchers developed a theoretical descriptor to predict oxygen reduction reaction catalyst efficiency. This method guides the design of single-atom catalysts by managing their microenvironment for improved performance.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Tuning the microenvironment of metal sites is key for optimizing oxygen reduction reaction (ORR) catalysis and understanding reaction mechanisms.
- Stochastic properties of traditional pyrolyzed single-atom catalysts (SACs) hinder clear structure-reactivity relationship determination.
Purpose of the Study:
- To develop a theoretical descriptor for predicting the catalytic efficiency of cobalt porphyrin-based SACs for ORR.
- To guide the rational design of SACs with tailored microenvironments for enhanced ORR performance.
Main Methods:
- Utilized binding energies of oxygen adsorbates to create a theoretical descriptor and a Sabatier volcano plot.
- Associated the volcano plot with calculated overpotential to forecast catalytic efficiency.
- Implemented a secondary sphere microenvironment customization strategy on cobalt porphyrin-based polymer nanocomposites.
Main Results:
- The theoretical descriptor and Sabatier volcano plot successfully predicted catalyst efficiency.
- Electron-withdrawing substituents were shown to mitigate over-strong *OH intermediate adsorption.
- Experimental validation demonstrated enhanced accessible active site density and faster charge migration kinetics in optimal carboxyl group-substituted catalysts.
Conclusions:
- The developed theoretical descriptor provides a reliable method for forecasting SAC catalytic efficiency.
- Microenvironment engineering, guided by the Sabatier volcano map, is crucial for designing high-performance SACs.
- This work offers strategies for creating well-managed microenvironments in SACs for improved ORR catalysis.
