An aqueous rechargeable formate-based hydrogen battery driven by heterogeneous Pd catalysis

Area of Science:

• Electrochemistry
• Materials Science
• Sustainable Energy

Background:

• Rechargeable hydrogen batteries (RHBs) offer potential for safe and sustainable hydrogen storage.
• Current RHB technologies face challenges in efficiency and long-term durability.
• Meeting the demand for reliable H2 storage in fuel cell applications is critical.

Purpose of the Study:

• To develop an additive-free rechargeable hydrogen battery (RHB) with high reversible capacity.
• To investigate a novel catalytic system for efficient hydrogen storage and release.
• To assess the durability and reversibility of the RHB system over multiple cycles.

Main Methods:

• Utilizing aqueous formate dehydrogenation (discharging) and bicarbonate hydrogenation (charging) cycles.
• Employing highly strained palladium (Pd) nanoparticles anchored on graphite oxide nanosheets as a solid catalyst.
• Evaluating the performance and capacity retention of the RHB over repeated discharging/charging cycles.

Main Results:

• The additive-free RHB system demonstrated efficient and facile H2 handling.
• The Pd nanoparticles on graphite oxide nanosheets acted as a robust catalyst for both charging and discharging.
• The battery maintained storage capacity over six repeated discharging/charging cycles without significant degradation.

Conclusions:

• The developed formate-based RHB is a promising technology for safe, reliable, and sustainable H2 storage.
• The novel catalyst system enables efficient and durable reversible hydrogen handling.
• This additive-free RHB system shows potential for practical fuel cell applications.