A Two-Dimensional Cu-Based Nanosheet Producing Formic Acid Via Glycerol Electro-Oxidation in Alkaline Water

Area of Science:

• Electrochemistry
• Materials Science
• Green Chemistry

Background:

• The oxygen evolution reaction (OER) is a bottleneck in energy-efficient hydrogen production via electrolysis.
• Organic molecule oxidation reactions offer a lower-potential alternative to OER.
• Glycerol oxidation reaction (GOR) is a promising pathway due to glycerol's abundance as a biodiesel byproduct.

Purpose of the Study:

• To develop a cost-effective, energy-efficient method for synthesizing CuO nanosheets (CuO NS).
• To evaluate the electrocatalytic performance of CuO NS for glycerol oxidation.
• To explore CuO NS as a potential catalyst for green hydrogen production.

Main Methods:

• Synthesized two-dimensional CuO nanosheets (CuO NS) using a low-cost, room-temperature method.
• Embedded CuO NS onto a carbon paper electrode.
• Investigated the electrocatalytic activity for glycerol oxidation reaction (GOR) and other alcohol oxidations.

Main Results:

• The CuO NS electrode demonstrated excellent glycerol electro-oxidation performance at a low applied potential.
• Formic acid was the primary product of CuO NS-driven GOR, with a Faradaic efficiency of approximately 80%, mainly via the glyceraldehyde pathway.
• The material showed activity for ethylene glycol and diethylene glycol oxidation, though with lower efficiency.

Conclusions:

• The synthesized CuO NS material is a robust and efficient electrocatalyst for GOR.
• This CuO NS material shows potential for large-scale electrolyzers utilizing the hydrogen evolution reaction (HER)/GOR.
• The study presents a viable alternative to OER for enhancing the cost-effectiveness of green hydrogen production.