Constructing abundant interfaces by decorating MoP quantum dots on CoP nanowires to induce electronic structure...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Interface engineering is crucial for optimizing catalyst performance by modifying surface properties.
• Hierarchical heterostructures offer unique advantages for catalytic applications.

Purpose of the Study:

• To investigate the interface effect mechanism in a hierarchical MoP/CoP/Cu3P/CF structure.
• To enhance catalytic activity for efficient hydrogen production.

Main Methods:

• Fabrication of a hierarchical MoP/CoP/Cu3P/CF heterostructure.
• Electrochemical characterization including overpotential and Tafel slope measurements.
• Density Functional Theory (DFT) calculations to analyze electronic structures and adsorption properties.

Main Results:

• The MoP/CoP/Cu3P/CF heterostructure exhibited an outstanding overpotential of 64.6 mV at 10 mA cm-2 and a Tafel slope of 68.2 mV dec-1.
• DFT calculations revealed favorable H* adsorption at the MoP/CoP interface (-0.08 eV) compared to pure phases.
• The CoCH/Cu(OH)2/CF‖MoP/CoP/Cu3P/CF electrolyzer achieved 10 mA cm-2 at 1.53 V for overall water splitting.

Conclusions:

• Interface engineering effectively modulates electronic structures, leading to enhanced catalytic activity.
• The hierarchical MoP/CoP/Cu3P/CF catalyst presents a promising approach for high-performance hydrogen production.
• This study offers a new strategy for designing efficient electrocatalysts via interface effects.