One-dimensional Ni₂P/Mn₂O₃ nanostructures with enhanced oxygen evolution reaction activity

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Nickel-based transition metal phosphides are effective oxygen evolution reaction (OER) electrocatalysts.
• Developing advanced electrocatalysts with high electrochemical active areas is crucial for improving OER performance.

Purpose of the Study:

• To synthesize and characterize novel Ni2P/Mn2O3 nanofibers as OER electrocatalysts.
• To investigate the impact of one-dimensional nanostructures and composite oxides on electrocatalytic performance.
• To evaluate the catalytic activity and stability of the synthesized nanofibers for oxygen production.

Main Methods:

• Synthesis of Ni2P/Mn2O3 nanofibers.
• Electrochemical characterization including cyclic voltammetry and long-term stability tests.
• Performance evaluation in 1 M KOH electrolyte for oxygen evolution.

Main Results:

• The Ni2P/Mn2O3 nanofibers exhibited an ultra-high electrochemical active area.
• A low overpotential of 280 mV was required to achieve a current density of 10 mA cm-2 for oxygen evolution.
• The catalyst maintained stable nanostructure and activity after 2000 cycles of voltammetry measurements.

Conclusions:

• The synthesized Ni2P/Mn2O3 nanofibers show excellent electrocatalytic activity and stability for the OER.
• Constructing one-dimensional nanostructures and composite oxides is an effective strategy to enhance transition metal phosphide electrocatalysts.
• This research offers a viable approach for designing high-performance nanostructured electrocatalysts for OER applications.