Interface and defect engineering of hybrid nanostructures toward an efficient HER catalyst

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The hydrogen evolution reaction (HER) is crucial for clean energy via hydrogen production.
• Efficient and robust electrocatalysts with abundant active sites and conductivity are essential for water splitting.
• Low-dimensional carbon materials are emerging as promising metal-free HER catalysts, but require structural engineering for enhanced activity.

Purpose of the Study:

• To design and synthesize a novel boron and nitrogen-doped carbon nanostructure (CNS)-hexagonal boron nitride (hBN) heterostructure for improved HER catalysis.
• To investigate the synergistic effects between doped CNS and hBN layers in enhancing electrocatalytic performance.
• To elucidate the role of defects and doping in the catalytic mechanism using experimental and computational methods.

Main Methods:

• Synthesis of a B and N doped CNS-hBN heterostructure.
• Comprehensive morphological, structural, and electrochemical characterization.
• Density functional theory (DFT) calculations to analyze defect and doping effects.

Main Results:

• The synthesized CNS-hBN heterostructure exhibits excellent HER activity.
• Exposed defects and edges on hBN layers serve as active sites for proton adsorption and reduction.
• Synergistic interactions between doped CNS and hBN significantly enhance electrocatalytic performance.

Conclusions:

• The B and N doped CNS-hBN heterostructure is a highly effective metal-free electrocatalyst for HER.
• The engineered nanostructure design and synergistic effects are key to superior catalytic activity.
• DFT calculations provide crucial insights into the fundamental mechanisms driving the enhanced performance.