Dodecahedral W@WC Composite as Efficient Catalyst for Hydrogen Evolution and Nitrobenzene Reduction Reactions.
Zhao-Yang Chen1, Long-Fa Duan1, Tian Sheng2
1State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, International Sci. & Tech. Cooperation Base of Energy Materials and Application, College of Chemical Engineering and Materials Science, Zhejiang University of Technology , 18 Chaowang Road, Hangzhou 310032, P. R. China.
ACS Applied Materials & Interfaces
|June 1, 2017
Summary
A new W@WC core-shell catalyst was synthesized using a water-mediated method. This catalyst shows excellent electrocatalytic activity for hydrogen evolution and nitrobenzene reduction, offering a cost-effective alternative to platinum.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Core-shell composites with strong phase-phase contact enhance catalytic activity.
- Developing efficient and economical catalysts is crucial for energy conversion and environmental applications.
Purpose of the Study:
- To synthesize a novel mesoscopic core-shell W@WC architecture with dodecahedral microstructure.
- To investigate the electrocatalytic activities of W@WC for hydrogen evolution and nitrobenzene electroreduction.
- To explore the potential of W@WC as an economical alternative to platinum catalysts.
Main Methods:
- A one-pot, H2O-mediated synthesis method was employed to create the W@WC core-shell structure.
- Density Functional Theory (DFT) calculations were used to understand the electronic properties and reaction mechanisms.
- Electrocatalytic performance was evaluated for hydrogen evolution and nitrobenzene reduction reactions.
Main Results:
- The H2O-mediated method successfully produced W@WC with a W core and W-terminated WC shell, preventing carbon diffusion.
- DFT calculations indicated reduced oxygen adsorption energy and a favorable W-terminated WC surface for catalysis.
- W@WC demonstrated significant electrocatalytic activity comparable to commercial Pt/C and superior to other WC materials.
Conclusions:
- The synthesized W@WC core-shell catalyst exhibits high activity and stability for key electrochemical reactions.
- W@WC presents a promising, cost-effective alternative to platinum catalysts in energy conversion and environmental remediation.
- The synthesis approach is adaptable for creating diverse metal-carbide composites for various applications.
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