Hexagonal Boron Nitride as a Multifunctional Support for Engineering Efficient Electrocatalysts toward the Oxygen...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing advanced electrocatalysts with well-defined interfaces is crucial for energy conversion technologies.
• Heterostructures offer unique properties for enhanced catalytic performance.
• The oxygen reduction reaction (ORR) is a key process in fuel cells and metal-air batteries.

Purpose of the Study:

• To design and synthesize efficient electrocatalysts for the oxygen reduction reaction (ORR) using hexagonal boron nitride (h-BN) nanosheets as a support.
• To investigate the role of h-BN in enhancing the activity, durability, and reaction kinetics of palladium-based electrocatalysts.
• To explore the interface engineering of h-BN/Pd heterostructures for improved electrocatalysis.

Main Methods:

• Synthesis of h-BN/Pd heterostructured electrocatalysts by confining palladium nanoparticles (NPs) on ultrathin h-BN nanosheets.
• Characterization of catalyst structure, morphology, and surface properties.
• Electrochemical evaluation of ORR activity and durability.
• Theoretical calculations (e.g., DFT) to understand the electronic interactions between h-BN and Pd.

Main Results:

• The h-BN/Pd heterostructures exhibited decent activity and long-term durability for the ORR.
• The robust h-BN support maintained the structural integrity of the palladium nanoparticles.
• Experimental and theoretical studies revealed that the strong h-BN-Pd interaction optimizes the Pd d-band center, enhancing affinity with reaction intermediates.
• The superhydrophobic surface imparted by h-BN promoted O2 diffusion kinetics.

Conclusions:

• Hexagonal boron nitride nanosheets are effective multifunctional supports for constructing efficient ORR electrocatalysts.
• Interface engineering between h-BN and Pd significantly optimizes electrocatalytic performance.
• These findings provide a new strategy for designing advanced heterostructured catalysts for electrocatalysis.