Nanostructured polyaniline-decorated Pt/C@PANI core-shell catalyst with enhanced durability and activity

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Platinum on carbon (Pt/C) is a widely used electrocatalyst.
• Durability and activity of Pt/C catalysts can be limited by degradation and mass transport.
• Polyaniline (PANI) is a conductive polymer with potential for catalyst support modification.

Purpose of the Study:

• To design and synthesize a novel polyaniline-decorated Pt/C@PANI core-shell catalyst.
• To investigate the effect of PANI shell thickness on catalytic activity and durability.
• To understand the mechanism behind the enhanced performance of the PANI-decorated catalyst.

Main Methods:

• Synthesis of Pt/C@PANI core-shell catalysts with varying PANI shell thicknesses.
• Electrochemical characterization using the oxygen reduction reaction (ORR) to assess activity and durability.
• Analysis of catalyst structure and electronic properties to elucidate performance enhancements.

Main Results:

• The Pt/C@PANI catalyst showed significantly enhanced activity and durability for the ORR compared to unmodified Pt/C.
• Catalytic performance was strongly dependent on PANI shell thickness, with optimal enhancement observed at 5 nm.
• The core-shell structure facilitated electron delocalization and transfer, improving catalyst function and protecting the carbon support.

Conclusions:

• The PANI-decorated Pt/C@PANI core-shell catalyst offers improved performance for the oxygen reduction reaction.
• The PANI shell thickness is a critical parameter for optimizing catalytic properties.
• The novel structure provides enhanced stability and activity, making it a promising electrocatalyst for fuel cells and other electrochemical applications.