Related Experiment Video
Updated: Aug 15, 2025
08:18
Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
11.6K
Single-Atom Pd-N4 Catalysis for Stable Low-Overpotential Lithium-Oxygen Battery.
Jian Zheng1, Wenjing Zhang1, Ruoyu Wang1
1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|December 29, 2022
Summary
Single-atom catalysts, specifically Pd-N4 sites on N-doped carbon, significantly reduce charge overpotential in lithium-oxygen batteries. This breakthrough enhances cycle stability and reversibility for advanced energy storage.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Lithium-oxygen (Li-O2) batteries face challenges with high charge overpotential, side reactions, and poor cycle stability.
- Single-atom catalysts (SACs) offer potential for improving oxygen evolution reaction (OER) kinetics in Li-O2 batteries.
- Understanding the structure-activity relationship of SACs for OER is crucial but limited.
Purpose of the Study:
- To synthesize and characterize atomically dispersed palladium (Pd) on N-doped carbon spheres (NC) as a cathode catalyst for Li-O2 batteries.
- To investigate the correlation between the Pd-N4 atomic structure and the OER mechanism.
- To evaluate the electrochemical performance of the designed SACs in Li-O2 batteries.
Main Methods:
- Template-assisted synthesis of Pd single atoms anchored on N-doped carbon spheres.
- Electrochemical characterization, including charge-discharge cycling and overpotential measurements.
- Theoretical simulations (e.g., DFT) to elucidate the OER mechanism and catalyst electronic structure.
Main Results:
- The synthesized catalyst features a well-defined Pd-N4 moiety.
- Optimized morphology and distribution of Li2O2 products, enhancing decomposition reversibility.
- Achieved a low charge overpotential of 0.24 V and sustained cycling stability at 500 mA g-1.
- Demonstrated high capacity retention up to 10,000 mAh g-1 at a low charge voltage.
Conclusions:
- The Pd-N4 configuration in SACs facilitates electron transfer, weakening Pd adsorption energy for intermediates.
- The designed Pd SACs/NC cathode significantly improves the stability and efficiency of Li-O2 batteries.
- This study provides insights for designing efficient SACs for stable, low-overpotential Li-O2 batteries.
