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Published on: December 6, 2021
3D nanostructured Ce-doped CoFe-LDH/NF self-supported catalyst for high-performance OER
Lu Wang1, Yi Liu1, Xiaoheng Liu2
1Key Laboratory of Education Ministry Functional for Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China. wl8909@ahnu.edu.cn.
This study developed a novel self-supported electrocatalyst for oxygen evolution reactions (OER) using Ce-doped CoFe layered double hydroxides on nickel foam. This adhesive-free electrode demonstrates excellent OER performance and stability, offering a low-cost alternative to noble metals.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Powder electrocatalysts for oxygen evolution reactions (OER) typically require adhesives, increasing resistance and reducing catalyst stability.
- This limitation hinders long-term performance and catalyst loading in OER applications.
Purpose of the Study:
- To develop a high-performance, self-supported electrocatalyst for OER without using adhesives.
- To investigate the effect of Ce doping on CoFe layered double hydroxides (LDH) for enhanced OER activity and stability.
Main Methods:
- A one-step hydrothermal synthesis was employed to grow Ce-doped CoFe layered double hydroxides (Ce-CoFe-LDH) uniformly on nickel foam (NF).
- The morphology and composition of the self-supported electrode (Ce-CoFe-LDH/NF) were characterized.
- Electrocatalytic performance for OER was evaluated in 1 M KOH, including overpotential, Tafel slope, and charge transfer impedance.
Main Results:
- A nanostructured, self-supported Ce-CoFe-LDH/NF electrode with a regular nanoneedle morphology was successfully fabricated.
- The Ce-doped CoFe-LDH exhibited enhanced OER activity with an optimized overpotential of 225 mV at 10 mA cm⁻², a Tafel slope of 34.34 mV dec⁻¹, and low charge transfer resistance (2.4 Ω).
- The electrode demonstrated remarkable stability, with only a 0.04 V increase in overpotential after 24 hours of operation at 50 mA cm⁻².
Conclusions:
- Ce doping in CoFe-LDH induces lattice distortion and defects, significantly boosting OER catalytic behavior.
- The adhesive-free, self-supported Ce-CoFe-LDH/NF electrode presents a cost-effective and robust alternative to noble metal catalysts for OER.
- This study offers a universal strategy for fabricating high-performance supported catalysts for energy-related applications.
