How are Copper Oxide Catalysts Applied in Fuel Cells?

Copper oxide, as an important inorganic material, has wide applications in catalysis and ceramics. In fuel cell technology, copper oxide, due to its relatively low cost and abundant sources, has become one of the most promising catalysts to replace precious metals.

Copper oxide plays several key roles in fuel cells, and its value is mainly reflected in its catalytic activity and cost advantages.

In terms of catalytic performance, copper oxide has a variable valence state, capable of transforming between Cu⁰ and Cu²⁺, which not only enhances catalytic activity but also improves the stability of the catalytic process. Taking the oxygen reduction reaction as an example, the composite catalyst formed by the synergistic effect of CuO and Co₂⁺ exhibits superior ORR activity (E1/2 = 0.83 V) and long-term stability compared to commercial platinum-carbon catalysts.
Furthermore, when copper oxide forms composite catalysts with other metal oxides, it can produce synergistic effects, significantly improving catalytic performance.
For example, the CuO/CeO₂ catalyst is widely studied for its superior CO oxidation performance.

Copper oxide catalysts have important applications in various types of fuel cells, demonstrating their wide applicability. 

In proton exchange membrane fuel cells, copper oxide catalysts are mainly used for the preferential oxidation of CO under hydrogen-rich conditions (CO-PROX).

This is because even trace amounts of CO (below 10 ppm) can poison and deactivate the platinum electrode, while the CuO/CeO₂ catalyst can effectively remove CO from hydrogen gas, ensuring the normal operation of the fuel cell. In direct methanol fuel cells (DMFCs), copper oxide can be used as an anode catalyst to promote the methanol oxidation reaction.
Studies have shown that Cu₂O and CuO electrodes exhibit catalytic activity and high stability for methanol electro-oxidation.
In direct methanol fuel cells, Cu₂O and CuO electrodes prepared by reactive sputtering not only show good electrocatalytic activity but also possess excellent electrochemical energy storage performance, with specific capacitances reaching 215 F/g and 272 F/g, respectively.
In microbial fuel cells, FeCu bimetallic oxides, as oxygen reduction catalysts, significantly improve the stability of the battery.

author: Hazel
date: 2025-11-24