Self-Activated CuAg Metal Heterojunctions for Hydrazine-Assisted Hydrogen Evolution and Zn-Hz Battery Applications

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Hydrazine-assisted reactions offer a promising route for efficient hydrogen production and advanced battery technologies.
• Developing robust catalysts is crucial for harnessing these reactions in energy devices.

Purpose of the Study:

• To develop and characterize a novel CuAg/NCF catalyst for both hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR).
• To evaluate the catalyst's performance in hydrazine-assisted water splitting and zinc-hydrazine batteries.

Main Methods:

• Synthesis of CuAg/NCF catalyst supported on porous NiCo foam.
• Electrochemical characterization including HER and HzOR performance testing.
• Fabrication and testing of a hydrazine-assisted water-splitting electrolyzer and a zinc-hydrazine battery.

Main Results:

• The CuAg/NCF catalyst demonstrated high current densities for HER and HzOR in alkaline conditions.
• Hydrazine-assisted water splitting achieved high efficiency (1000 mA cm⁻² at 0.477 V), saving 85% energy with excellent stability.
• The developed zinc-hydrazine battery exhibited over 93% energy efficiency and a peak power density of 1.74 mW cm⁻².

Conclusions:

• Cu-Ag interfacial synergy within the 3D nanoneedle structure significantly enhances catalytic activity for HER and HzOR.
• The catalyst enables highly energy-efficient hydrazine-assisted water splitting and high-performance zinc-hydrazine batteries.
• This work presents a viable pathway for advanced energy solutions using hydrazine-based electrocatalysis.