Sputtered Pd as hydrogen storage for a chip-integrated microenergy system

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Hydrogen storage is crucial for microenergy systems.
• Palladium (Pd) films are promising candidates for hydrogen storage.
• Controlling film properties is key for efficient hydrogen cycling.

Purpose of the Study:

• To prepare and characterize dc magnetron sputtered Pd films for hydrogen storage.
• To investigate the influence of sputtering pressure on film properties.
• To evaluate the electrochemical performance of Pd films in a chip-integrated system.

Main Methods:

• X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AMF) for physical characterization.
• Cyclic voltammetry and galvanostatic polarization for electrochemical analysis.
• Four-probe technique for electrical property evaluation.

Main Results:

• Optimal sputtering pressure identified for reproducible Pd layers with desired surface morphology and mechanical stability.
• Demonstrated electrochemical activity for hydrogen adsorption/desorption and palladium hydride (PdH) formation.
• Successful integration and stable recycling performance of Pd films in a unitized microenergy system.

Conclusions:

• The optimized sputtering process yields high-quality Pd films suitable for hydrogen storage.
• The developed microenergy system with Pd film storage shows stable operation.
• This research advances the development of efficient chip-integrated hydrogen microenergy systems.