Metal-organic framework derived heterostructured phosphide bifunctional electrocatalyst for efficient overall water...

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Developing efficient and stable electrocatalysts for overall water splitting is crucial for hydrogen production and sustainable energy.
• Non-noble metal-based catalysts are highly desirable due to their cost-effectiveness compared to precious metal alternatives.
• Metal-Organic Frameworks (MOFs) offer unique structural properties for designing advanced catalytic materials.

Purpose of the Study:

• To synthesize a novel, non-noble bifunctional electrocatalyst for overall water splitting using a MOF precursor.
• To investigate the effects of doping strategy and interface engineering on catalytic performance.
• To evaluate the electrocatalytic activity, stability, and potential for hydrogen production.

Main Methods:

• Synthesis of a novel porous MOF (Ni-DPT) as a precursor.
• Fabrication of a bifunctional NiCoP/Ni12P5@NF electrocatalyst via doping and interface engineering.
• Structural characterization (e.g., SEM, TEM, XRD) and Density Functional Theory (DFT) calculations.
• Electrochemical performance testing for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).

Main Results:

• The NiCoP/Ni12P5@NF catalyst exhibits a self-supporting, layered structure with a heterojunction interface and N-P doping.
• DFT calculations and characterization confirm that the heterojunction interface optimizes the electronic structure for hydrogen adsorption (ΔGH*).
• The catalyst shows low overpotentials: 100 mV for HER and 310 mV for OER at 10 mA·cm-2.
• An anion exchange membrane electrolyzer using this catalyst operated stably for 200 hours at 100 mA·cm-2.

Conclusions:

• The developed NiCoP/Ni12P5@NF electrocatalyst is highly active and stable for overall water splitting.
• Interface engineering and doping strategies are effective in enhancing the performance of non-noble electrocatalysts.
• This work provides insights for designing cost-effective, multifunctional electrocatalysts for sustainable hydrogen production.