Facile aqueous phase synthesis of 3D-netlike Pd-Rh nanocatalysts for methanol oxidation

摘要

The structure-activity relationship between the morphology and composition of Pd-based nanocatalysts is an important fundamental issue in direct methanol fuel cells (DMFC). Three dimensional (3D) netlike Pd-Rh bimetallic catalysts with different atomic ratios (Pd1Rh3, PdRh, Pd3Rh1) are synthesized through a simple wet chemical way using P123 as a reducing agent and KBr as morphological regulator. The morphology, structure and composition of the catalysts are proved by a series of physicochemical test technology. It is shown that the 3D-netlike structure is composed of short self-assembly nanochains. Electrochemical results display that their application towards methanol oxidation reaction (MOR) in alkaline solution. The MOR activity of the optimized Pd3Rh1 nanocatalyst is improved to about 4.0 mA cm(-2), which is much higher than that of the commercial Pd/C catalyst. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.