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Moderate Ce doping enables outstanding oxygen evolution activity and stability in CoMn-LDH nanosheets
Wenjie Cao1,2, Yangchun Guo1,2, Kuan Wang2
1Xi'an Key Laboratory of Compound Semiconductor Materials and Devices, School of Physics & Information Science, Shaanxi University of Science & Technology, Xi'an 710021, China. hao.xiaodong@sust.edu.cn.
This study developed efficient non-precious electrocatalysts for the oxygen evolution reaction (OER) using cerium-doped cobalt-manganese layered double hydroxide (CM-LDH-Ce) nanosheets. Moderate doping enhances performance and stability for sustainable hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient and durable non-precious electrocatalysts is crucial for sustainable hydrogen production via water electrolysis.
- The oxygen evolution reaction (OER) is a key bottleneck in water splitting.
Purpose of the Study:
- To synthesize and characterize cerium-doped cobalt-manganese layered double hydroxide (CM-LDH-Ce) nanosheets as non-precious electrocatalysts for OER.
- To investigate the effect of cerium doping concentration on the structure, electronic properties, and OER performance of CM-LDH.
Main Methods:
- Solvothermal synthesis of CM-LDH-Ce nanosheets with varying Ce content (0-15 at%).
- Comprehensive characterization using techniques to analyze nanoarchitecture, surface area, electronic structure, and oxygen vacancies.
- Electrochemical evaluation of OER activity and stability in alkaline medium.
Main Results:
- Moderate Ce doping (2.5 at%) optimized the core-shell nanoarchitecture, increased surface area, modulated electronic structures, and introduced oxygen vacancies.
- The optimized CM-LDH-Ce2.5 catalyst showed low overpotentials (287 mV at 10 mA cm⁻²; 500 mV at 500 mA cm⁻²), a Tafel slope of 87.12 mV dec⁻¹, and over 100 hours of stability.
- Excessive Ce doping (≥10 at%) led to structural degradation and reduced catalytic activity.
Conclusions:
- Controlled cerium doping in CM-LDH provides a rational design strategy for high-performance OER electrocatalysts.
- The study highlights the dopant-dependent relationship between structural integrity and electrocatalytic function in layered double hydroxides.
- This work offers insights into rare-earth engineering for advanced electrocatalyst development.
