Abstract
A porous 3D prism-folding layered GO/MOF-74(Co) supported PdBiSn nanoalloys electrocatalyst (PdBiSn@GM-74) was synthesized via a facile assemble-reduction approach. Compared with Pd@GM-74, PdBi@GM-74, PdSn@GM-74, and commercial Pd/C, the trimetallic PdBiSn@GM-74 exhibits superior electrocatalytic activity and durability for ethylene glycol oxidation reaction (EGOR) in alkaline media, and the forward current density is as high as 225.56 mA cm−2, which is 8.32 times of commercial Pd/C, and still retains more than 74.8% of the original current density after the 3600 s CA test. The outstanding electrocatalytic performance can be realized by multimetallic synergy and structural-modification strategy, especially the electronic effects of PdBiSn nanoalloys significantly improve the electronic structure of Pd d-band and weaken the interaction between Pd and CO(ads), meanwhile, the surface decoration of BiSn NPs can dramatically adsorb more (CH2-OH)2 (ads) and OH−(ads), and accelerate the oxidative removal of CO(ads) toxic-species. Besides, the electrooxidation mechanism of EG and the catalytic removal process of CO(ads) on the Pd surface are proposed. This composite design and efficient catalytic properties would provide an important reference for developing advanced Pd-based electrocatalysts in direct EG fuel cells.
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