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Co-Doped Ni
Xue Li1, Xinglong Gao1, Enyan Guo1
1Shandong Provincial Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics, School of Material Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China.
Inorganic Chemistry
|June 7, 2023
Summary
Developing advanced electrocatalysts is key for clean energy. This study presents novel cobalt-doped nickel vanadate nanofibers, showcasing high activity and stability for oxygen reduction reactions in fuel cells and batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum-group metals are traditional catalysts for oxygen reduction, but their cost and scarcity limit applications.
- Developing efficient and robust non-platinum-group metal electrocatalysts is crucial for advancing fuel cells and metal-air batteries.
Purpose of the Study:
- To fabricate and characterize cobalt-doped Ni3V2O8 nanofibers as high-performance electrocatalysts for the oxygen reduction reaction (ORR).
- To investigate the synergistic effects of cobalt and nickel on the ORR activity and stability.
Main Methods:
- Gradient electrospinning and controllable pyrolysis were employed to synthesize Co-doped Ni3V2O8 nanofibers.
- Electrochemical performance was evaluated in an alkaline solution, including half-wave potential and long-term stability tests.
- Control experiments and theoretical calculations were used to elucidate the catalytic mechanism.
Main Results:
- The representative Co1.3Ni1.7V2O8 nanofibers exhibited outstanding ORR activity with a half-wave potential of 0.874 V vs RHE and excellent long-term stability.
- Cobalt doping restrained nanoparticle growth and modified the electronic structure of Ni3V2O8, enhancing oxygen adsorption.
- Synergistic effects between Co and Ni metal centers and weakened binding of intermediates were identified as key factors for high ORR activity.
Conclusions:
- Co-doped Ni3V2O8 nanofibers represent a promising class of non-platinum electrocatalysts for oxygen reduction.
- The findings provide valuable insights into designing efficient ORR catalysts through synergistic effects and electronic structure engineering.
- This research contributes to the development of advanced materials for electrochemical clean energy conversion and storage devices.
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