Boosting Hydrazine Oxidation Reaction on CoP/Co Mott-Schottky Electrocatalyst through Engineering Active Sites

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• The oxygen evolution reaction (OER) for hydrogen production via water splitting is sluggish.
• The hydrazine oxidation reaction (HzOR) is a promising alternative but requires highly active electrocatalysts.
• Current electrocatalysts for HzOR exhibit unsatisfactory activity and high overpotentials.

Purpose of the Study:

• To design and investigate a Mott-Schottky electrocatalyst for efficient hydrazine oxidation reaction (HzOR).
• To achieve superior HzOR activity with ultralow potentials for hydrogen production.
• To understand the mechanism behind the enhanced catalytic performance.

Main Methods:

• Synthesis of CoP/Co nanoparticles as a Mott-Schottky electrocatalyst.
• Electrochemical characterization to evaluate HzOR activity.
• Density functional theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

• The CoP/Co electrocatalyst demonstrated remarkable HzOR activity.
• Ultralow potentials of -69 mV and -177 mV at 10 and 100 mA cm^-2 were achieved.
• The catalyst's performance is comparable to precious-metal-based materials.
• DFT calculations confirmed the role of interfaces in providing active sites and promoting dehydrogenation.

Conclusions:

• CoP/Co nanoparticles form an effective Mott-Schottky electrocatalyst for HzOR.
• The catalyst design significantly enhances hydrogen production efficiency.
• This work presents a promising pathway for power-frugal hydrogen generation.