Laser-Assisted synthesis of Bi-Decorated Pt aerogel for efficient methanol oxidation electrocatalysis

Abstract

Improving the activity and stability of electrocatalysts for methanol oxidation reaction (MOR) is key important for the large-scale application of direct methanol fuel cells (DMFCs). Herein, we provide a novel scheme to firstly build Bi-decorated Pt aerogel through the structural reconstruction of Pt/Bi2O3 interface, which demonstrates an excellent mass activity of 7.99 A mg-1Pt in MOR (8-fold higher than that of commercial Pt/C). Experimental results show that the synergistic effect between Bi0 species and Pt aerogel is the major cause of the improvement of the catalytic activity. In-suit Fourier transform infrared (FTIR) Spectroscopy results indicated that the generation and transformation of HCOO– intermediate are accelerated. Density functional theory (DFT) calculations indicate that the decorated Bi enhances the adsorption of OH species on the adjacent Pt site, which can facilitate the dehydrogenation of methanol and the removal of poisonous CO species. Thus, the electro-catalytic performance can be improved. This strategy can be extended to construct other types of interfaces, which may open new routes for the synthesis of highly efficient electrocatalysts.