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Promoting Pt catalysis for CO oxidation via the Mott-Schottky effect
Peiwen Wu1, Zili Wu2, David R Mullins2
1School of Chemistry and Chemical Engineering; Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, China. zhuws@ujs.edu.cn and Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA. dais@ornl.gov.
Nanoscale
|July 10, 2019
Summary
We developed Mott-Schottky modulated catalysis using carbon nitride supports to tune platinum nanoparticle charge states. This method significantly enhances catalytic CO oxidation activity at low temperatures.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- CO oxidation is crucial for industrial and experimental applications.
- Catalyst charge state critically influences CO oxidation efficiency on surfaces like platinum (Pt).
- Optimizing Pt charge is key for balancing CO and O2 adsorption and activation.
Purpose of the Study:
- To introduce and demonstrate "Mott-Schottky modulated catalysis" using electron-donating carbon nitride (CN) supports.
- To investigate the effect of tunable Fermi levels in CN on Pt nanoparticle (NP) electronic structure.
- To enhance catalytic CO oxidation activity through controlled Pt NP charging.
Main Methods:
- Utilizing electron-donating carbon nitride (CN) as a support for platinum nanoparticles (Pt NPs).
- Modulating the Fermi level of the CN support to tune the electronic structure and charge state of Pt NPs.
- Evaluating catalytic CO oxidation performance, including initial and total conversion temperatures.
Main Results:
- Achieved excellent catalytic CO oxidation activity with properly charged Pt NPs.
- Demonstrated initial CO conversion at 25 °C and total conversion below 85 °C.
- Confirmed that the tunable electronic structure of Pt NPs, regulated by the CN Fermi level, is crucial for catalytic performance.
Conclusions:
- Mott-Schottky modulated catalysis effectively enhances CO oxidation on Pt NPs.
- The charge state of metal catalysts can be precisely controlled via support Fermi level modulation.
- This strategy offers a new pathway for designing high-performance catalysts for various reactions.
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