Interface Local-Alkalinity Engineering for Enhanced Dehydrogenation Catalysis in Neutral Media

Area of Science:

• Catalysis
• Materials Science
• Electrochemistry

Background:

• Hydrous hydrazine is a promising liquid-phase hydrogen storage material.
• Sluggish reaction kinetics under neutral conditions limit hydrous hydrazine's practical application.
• Interfacial engineering offers a strategy to enhance catalytic performance.

Purpose of the Study:

• To design a catalyst that enables efficient hydrogen production from hydrous hydrazine under neutral conditions.
• To investigate the role of interfacial engineering in modulating catalytic activity.
• To achieve high hydrogen evolution rates at room temperature without alkaline additives.

Main Methods:

• Design and synthesis of a NiPt-Ni(OH)2 interface catalyst.
• Characterization using spectroscopic analysis.
• Computational modeling using density functional theory (DFT) calculations.
• Evaluation of catalytic performance via hydrogen evolution rate measurements.

Main Results:

• The NiPt-Ni(OH)2 catalyst achieved a record apparent turnover frequency of 310.7 h-1 at 298 K.
• Demonstrated highly efficient hydrogen production from hydrous hydrazine under neutral conditions.
• Interfacial Ni(OH)2 modulated the NiPt alloy's electronic structure and provided Brønsted basic sites.
• Lowered dehydrogenation energy barrier and accelerated hydrogen evolution kinetics.

Conclusions:

• The engineered NiPt-Ni(OH)2 interface effectively enhances hydrous hydrazine dehydrogenation.
• Dual electronic and chemical modulation at the interface is key to improved catalytic activity.
• This interface engineering paradigm is generalizable for catalytic enhancement under mild conditions.