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Hierarchically fractal Co with highly exposed active facets and directed electron-transfer effect
Yu Liu1, Hao-Zheng Yu1, Yong Wang1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & International School of Materials Science and Engineering & School of Materials Science and Engineering & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao), Wuhan University of Technology, Wuhan, 430070, China. xyyang@whut.edu.cn.
Hierarchically fractal cobalt (Co) nanoparticles were synthesized for improved hydrogen evolution reaction (HER) catalysis. These nanoparticles exhibit enhanced HER activity compared to conventional nanostructured cobalt.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- The hydrogen evolution reaction (HER) is crucial for clean energy technologies.
- Developing efficient and cost-effective HER catalysts is essential.
- Cobalt-based materials are promising candidates for HER catalysis.
Purpose of the Study:
- To synthesize hierarchically fractal cobalt (Co) with highly exposed active (002) facets.
- To investigate the effect of these facets on the work function and hydrogen adsorption free energy.
- To design advanced HER catalysts through directed electron-transfer.
Main Methods:
- Template-free self-assembly method for cobalt nanoparticle synthesis.
- Characterization of the fractal structure and exposed facets.
- Electrochemical evaluation of HER activity.
Main Results:
- Hierarchically fractal Co nanoparticles were successfully synthesized.
- The synthesized Co exhibited a higher work function and moderate hydrogen adsorption free energy.
- A significant improvement in HER activity was observed compared to nanostructured Co.
Conclusions:
- Hierarchically fractal cobalt with exposed (002) facets is an effective design strategy for enhancing HER catalysts.
- The improved performance is attributed to the unique structural and electronic properties.
- This approach offers a promising route for developing advanced electrocatalysts for hydrogen production.
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