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Atomic Layer Engineering of Pd Nanosheets for an Enhanced Hydrogen Evolution Reaction
Sumiya Ando1, Eisuke Yamamoto1, Makoto Kobayashi1
1Department of Materials Chemistry & Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Nagoya 464-8601, Japan.
Nano Letters
|August 5, 2024
Summary
Researchers developed a new method for precisely controlling the thickness of 2D palladium nanosheets. This atomic layer engineering enhances their electronic properties for improved hydrogen evolution reactions in catalysis.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Controlling the thickness of 2D metal nanosheets (metallenes) is crucial for energy and catalyst applications.
- Current methods lack efficiency for tailored synthesis of metallenes with controlled atomic layers.
Purpose of the Study:
- To report a 2D template-directed synthesis for ultrathin palladium (Pd) nanosheets with well-controlled thicknesses.
- To investigate the impact of atomic layer engineering on the electronic properties and catalytic activity of Pd nanosheets.
Main Methods:
- One-pot synthesis of single-crystalline Pd nanosheets with hexagonal morphology using 2,4,6-trichlorophenyl formate.
- Utilizing synthesized Pd nanosheets as hard templates for controlled thickness synthesis (9, 11, 13, 15 atomic layers).
- Employing Hard X-ray Photoelectron Spectroscopy (HAXPES) and Density Functional Theory (DFT) calculations.
Main Results:
- Achieved tailored synthesis of Pd nanosheets with precise thickness control.
- Identified unique electronic states in thickness-controlled Pd nanosheets: reduced surface charges, increased work functions, and decreased d-band centers.
- Demonstrated improved hydrogen evolution reaction (HER) performance.
Conclusions:
- Atomic layer engineering of Pd nanosheets allows fine-tuning of surface electronic states.
- The developed method provides a pathway for designing advanced catalysts for energy applications.
- Thickness control is a key factor in optimizing the performance of 2D metallenes.
