Continuous Strain Regulation of Palladium-Gold at the Atomic Level
Qing-Man Liang1, Su-Kang Chen1, Zan Ding1
1Pen-Tung Sah Institute of Micro-Nano Science and Technology, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Joint Surgery and Sports Medicine, Zhongshan Hospital, Xiamen University, Xiamen 361005, China.
Nano Letters
|June 14, 2024
Summary
Applying mechanical strain to palladium (Pd) on gold (Au) catalysts precisely alters surface structure, significantly boosting hydrogen evolution reaction (HER) performance by enhancing electron transfer and facilitating hydrogen desorption.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Science
Background:
- Developing highly efficient electrocatalysts requires understanding how surface structure changes affect performance.
- Precise atomic-level control over catalyst surface structure remains a significant challenge in materials science.
Purpose of the Study:
- To investigate the impact of continuous surface strain on the electrocatalytic activity of palladium (Pd) on gold (Au).
- To establish a correlation between precisely regulated surface structure and enhanced catalytic performance for the hydrogen evolution reaction (HER).
Main Methods:
- Utilized a mechanically controllable surface strain (MCSS) setup for continuous strain regulation of Pd on Au.
- Employed *in situ* X-ray diffraction (XRD) to analyze structural changes under applied strain.
- Conducted theoretical calculations to elucidate the electronic structure modifications and reaction mechanisms.
Main Results:
- Strain application led to increased interplanar spacing in the Pd-Au system, confirmed by *in situ* XRD.
- The structural modifications accelerated electron transfer at the solid-liquid interface, significantly improving HER performance.
- Theoretical calculations indicated that tensile strain modulates Pd electronic structure, facilitating hydrogen intermediate desorption.
Conclusions:
- Continuous strain regulation offers an effective strategy for tuning electrocatalyst surface structure and activity.
- The study demonstrates a clear link between strain-induced structural changes and enhanced electrocatalytic performance for HER.
- This approach provides valuable insights into structure-activity relationships for catalyst development.
