A durable PtRu/C catalyst with a thin protective layer for direct methanol fuel cells

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Direct methanol fuel cells (DMFCs) require robust catalysts for efficient methanol oxidation.
• Durability of catalysts in acidic environments remains a significant challenge for DMFC performance.

Purpose of the Study:

• To develop a highly durable methanol oxidation catalyst for DMFC anodes.
• To enhance the stability of platinum-ruthenium (PtRu) alloy nanoparticles on a carbon support using a silane-coupling agent.

Main Methods:

• Preparation of PtRu alloy nanoparticles supported on carbon using a reduction method in the presence of a silane-coupling agent.
• Optimization of preparatory conditions, including silane-coupling agent concentration and solution pH.
• Evaluation of catalyst durability through prolonged immersion in sulfuric acid (H2SO4).

Main Results:

• PtRu alloy nanoparticles were dispersively adsorbed onto the carbon support.
• The prepared catalyst exhibited catalytic activity comparable to commercial catalysts.
• The catalyst maintained its activity and structure after 1000 hours of immersion in sulfuric acid.

Conclusions:

• The silane-coupling agent effectively stabilized PtRu alloy nanoparticles, significantly improving catalyst durability.
• The developed PtRu catalyst shows great promise for long-term application as an anode material in direct methanol fuel cells.