A superior mulberry-like nanoparticle NiB binary catalyst for borohydride oxidation.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Direct borohydride fuel cells (DBFCs) offer high energy density but require efficient anode catalysts.
• Noble metal catalysts are effective but costly and scarce.
• Development of cost-effective, high-performance catalysts is crucial for DBFC commercialization.

Purpose of the Study:

• To synthesize and characterize a novel nickel-boron (NiB) binary catalyst with a unique morphology.
• To evaluate the catalytic activity, selectivity, and stability of the NiB catalyst for the borohydride oxidation reaction (BOR).
• To assess the performance of the NiB catalyst as an anode in a direct borohydride fuel cell (DBFC).

Main Methods:

• One-step electrodeposition was used to prepare the NiB binary catalyst with a mulberry-like nanoparticle morphology.
• Electrochemical techniques were employed to study the catalytic properties for the borohydride oxidation reaction.
• A DBFC was assembled with the NiB catalyst as the anode to measure power density and open-circuit voltage.

Main Results:

• The prepared NiB-0.2 catalyst demonstrated excellent catalytic activity, selectivity, and stability for the BOR.
• The DBFC utilizing the NiB-0.2 anode achieved a peak power density of 453 mW cm⁻² and an open-circuit voltage of 1.96 V at 343 K.
• The enhanced performance is attributed to the introduction of boron (B) into the nickel (Ni) structure, creating a unique morphology.

Conclusions:

• The NiB binary catalyst, synthesized via electrodeposition, shows significant promise for the borohydride oxidation reaction.
• The developed catalyst offers a potential noble-metal-free alternative for efficient anode materials in DBFCs.
• This research provides inspiration for designing advanced catalysts for clean energy applications.