Concurrent Oxidation-Reduction Reactions in a Single System Using a Low-Plasma Phenomenon: Excellent Catalytic
Wail Al Zoubi1, Abdul Wahab Allaf2, Bassem Assfour3
1Materials Electrochemistry Laboratory, School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
ACS Applied Materials & Interfaces
|January 26, 2022
Summary
We developed a novel method to create stable copper nanoparticles (Cu NPs) on a TiO2@SiO2 support, enhancing catalytic activity and preventing degradation. This approach offers superior performance in reducing various organic compounds.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Metal nanocatalyst instability (agglomeration, detachment) hinders practical applications.
- Developing stable and active nanocatalysts on supports remains a significant challenge.
Purpose of the Study:
- To report a novel, one-step electro-oxidation-reduction method for preparing stable metal nanoparticles.
- To investigate the catalytic activity and stability of copper nanoparticles (Cu NPs) on a porous TiO2@SiO2 support.
Main Methods:
- A synchronized electro-oxidation-reduction "bottom-up" approach was employed.
- Preparation of small and highly stable Cu NPs on a porous TiO2@SiO2 coating.
- Density Functional Theory (DFT) calculations were used to verify experimental findings.
Main Results:
- The embedded structure prevented Cu NP sintering at high temperatures, showing high stability over 30 cycles.
- Achieved 100% reduction of 4-nitrophenol in 60 s with no activity decay.
- Demonstrated 100% conversion for nitroarenes, ketone/aldehydes, and organic dyes.
- DFT confirmed Cu NPs' superior adsorption on TiO2 compared to Fe and Ag NPs, boosting 4-NP adsorption and activity.
Conclusions:
- The novel synthesis strategy yields highly stable and active Cu NPs on TiO2@SiO2.
- The method is effective for various reductions and applicable to other single-atom catalysts (Fe, Ag).
- This approach overcomes key challenges in nanocatalyst preparation and application.
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