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Ce/Gd Co-doping in NiFe LDH engineered oxygen vacancies for enhanced oxygen evolution.

Xiaobing Bao1, Junfeng Wang1, Yang Yang1

  • 1School of Materials Science and Engineering, Chang'an University, Xi'an 710061, P. R. China. leigou@chd.edu.cn.

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Summary
This summary is machine-generated.

Co-doping nickel-iron layered double hydroxide (NiFe-LDH) with cerium and gadolinium creates oxygen vacancies, boosting oxygen evolution reaction (OER) performance and stability. This enhanced catalyst shows lower overpotential and long-term durability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Nickel-iron layered double hydroxide (NiFe-LDH) is a promising electrocatalyst for the oxygen evolution reaction (OER).
  • Enhancing the activity and stability of NiFe-LDH remains a key challenge for efficient water splitting.
  • Oxygen vacancies are known to improve catalytic performance.

Purpose of the Study:

  • To investigate the effect of co-doping with cerium (Ce) and gadolinium (Gd) on NiFe-LDH.
  • To explore the role of oxygen vacancies and dopant segregation in OER performance.
  • To evaluate the catalytic activity and long-term stability of the modified NiFe-LDH.

Main Methods:

  • Co-doping of NiFe-LDH with Ce and Gd.
  • Electrochemical characterization, including overpotential measurements at a current density of 10 mA cm⁻².
  • Long-term stability testing of the catalyst.

Main Results:

  • Co-doping successfully created abundant oxygen vacancies in the NiFe-LDH structure.
  • Ce segregated into CeO₂ nano-islands, while Gd remained uniformly dispersed during OER.
  • The Ce,Gd-NiFe LDH exhibited a 30 mV lower overpotential compared to pristine NiFe-LDH (228 mV) and maintained stable operation for over 140 hours.

Conclusions:

  • The synergistic effect of Ce and Gd co-doping, coupled with the formation of oxygen vacancies and controlled dopant segregation, significantly enhances OER performance.
  • Ce,Gd-NiFe LDH demonstrates superior activity and remarkable long-term stability, making it a highly promising electrocatalyst for OER.
  • This study provides insights into rational catalyst design for improved electrochemical energy conversion.