Black phosphorous/palladium functionalized carbon aerogel nanocomposite for highly efficient ethanol electrooxidation

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Direct ethanol fuel cells offer promising applications due to operational simplicity, high energy density, and low toxicity.
• The efficiency of direct ethanol fuel cells is significantly limited by the slow and incomplete ethanol electrooxidation (EEO) reaction.

Purpose of the Study:

• To develop highly active, cost-effective, and stable electrocatalysts for the ethanol electrooxidation (EEO) reaction in alkaline media.
• To investigate the synergistic effects between palladium (Pd) nanoparticles, black phosphorus (BP), and carbon aerogel (CA) supports for enhanced catalytic performance.

Main Methods:

• Facile synthesis of palladium nanoparticles and black phosphorus/palladium (BP/Pd) nanohybrids supported on carbon aerogel (CA).
• Comprehensive characterization of catalyst morphology, surface chemistry, and electronic properties.
• Electrochemical evaluation of catalyst performance for ethanol electrooxidation (EEO) in an alkaline medium.

Main Results:

• The synthesized BP/Pd/CA nanocomposite catalyst demonstrated remarkable catalytic activity and stability for EEO.
• A mass peak current density of 8376 mA mg_Pd^-1 was achieved, significantly outperforming commercial Pd/C catalysts (11.4 times higher).
• Characterization revealed that the BP-doped CA support enhances Pd dispersibility, prevents leaching, and modifies Pd's electronic properties, while the catalyst improves CA's conductivity and structure.

Conclusions:

• The synergistic interaction between the BP-doped CA support and the Pd-based catalyst significantly boosts the kinetics of the ethanol electrooxidation (EEO) reaction.
• This novel catalyst design offers a viable solution for improving the performance and practicality of direct ethanol fuel cells.