Industrial Alkaline Electrolyzers Enabled by Interface-Engineered Cobalt Oxide Electrodes for High-Efficiency Water...

Area of Science:

• Electrochemistry
• Materials Science
• Green Energy

Background:

• Alkaline (ALK) electrolysis is crucial for green hydrogen production.
• Efficient catalytic electrodes are needed for high current densities and low overpotentials.

Purpose of the Study:

• To develop an efficient and robust hydrogen-evolving electrode for ALK electrolysis.
• To demonstrate the potential of a novel Co3O4 catalyst for enhanced hydrogen production.

Main Methods:

• Fabrication of a Co3O4 nanosheet catalyst with a metal cobalt transition interface on a nickel wire mesh substrate.
• Electrochemical characterization of the electrode's performance in hydrogen evolution reaction.
• Testing in an industrial cell-stack electrolyzer.

Main Results:

• The Co3O4 electrode achieved 1000 mA cm-2 at 207 mV overpotential, outperforming commercial Raney nickel.
• An industrial electrolyzer with Co3O4 electrodes reached 1000 mA cm-2 at 2.0 V cell voltage.
• The electrode exhibited a minimal deactivation rate of 0.056 mV h-1.

Conclusions:

• The developed Co3O4 electrode offers superior performance for ALK electrolysis.
• This catalyst has the potential to replace commercial Raney nickel electrodes.
• The findings significantly enhance hydrogen production efficiency in ALK electrolyzers.