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Modulation of the superficial electronic structure via metal-support interaction for H2 evolution over Pd catalysts
Jin Wang1, Dan Cheng2,3, Mengmeng Gao1
1School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, University of Jinan Jinan 250022 P. R. China chm_zhangzl@ujn.edu.cn.
We discovered polarized electronic metal-support interaction (pEMSI) in palladium nanoparticles, enhancing catalytic activity for hydrogen production. Stronger pEMSI, indicated by surface electron accumulation, improves catalyst performance.
Area of Science:
- Catalysis
- Materials Science
- Surface Chemistry
Background:
- Electronic interactions significantly influence supported metal catalyst performance.
- Microscopic details of electronic tuning at metal surfaces and interfaces are not fully understood.
Purpose of the Study:
- To investigate and define the polarized electronic metal-support interaction (pEMSI) in oxide-supported palladium nanoparticles (NPs).
- To correlate pEMSI with catalytic activity for hydrogen evolution.
Main Methods:
- Characterization of palladium nanoparticles supported on oxides.
- Analysis of electronic properties at the metal-surface and metal-support interface.
- Evaluation of catalytic performance for hydrogen production.
Main Results:
- Identified pEMSI characterized by electron accumulation on NP surfaces (superficial Pd) and positive charges at the interface (interfacial Pd).
- Demonstrated that stronger pEMSI, driven by moderate metal-oxide interaction, NP fluxionality, and electron transport, leads to enhanced catalytic activity.
- Linked superficial Pd species to improved H2 evolution from metal hydrides and formates.
Conclusions:
- pEMSI is a key factor in enhancing supported metal nanoparticle performance.
- Precise regulation of electronic structure in NPs can be achieved through understanding pEMSI.
- This work opens new pathways for designing high-performance catalysts.
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