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Metal and Metal Oxide Interaction in Hollow CuO/Pd Catalyst Boosting Ethanol Electrooxidation

2020; Institute of Physics; Volume: 167; Issue: 6 Linguagem: Inglês

10.1149/1945-7111/ab7ffa

1945-7111

Yalan Shu, Yunshan Zheng, Ye Ying, Guoxiao Yu, Yiping Wu, Ying Wen, Haifeng Yang,

Copper-based nanomaterials and applications

A low Pd-loaded lychee-nut-like catalysts of CuO/Pd with hollow nanostructure are prepared by electrochemical displacement reaction, in which a Cu2O mesoporous sphere is as a sacrificial template in the presence of triblock copolymers Pluronic P123 (EO20PO70EO20). Furthermore, the feeding molar ratio of Cu2O and Na2PdCl4 is found to be critical factor for preparing well-defined hollow lychee-nut-like (HLN) CuO/Pd. Morphology, composition and crystal structure of the optimal HLN CuO/Pd catalysts are sufficiently characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy. The as-synthesized HLN CuO/Pd catalysts show high catalytic activity for ethanol oxidation in alkaline medium and the catalytic mass activity of the HLN CuO/Pd is 5.9-fold of commercial Pd/C and 10.8-fold of Pd black. In turn, HLN CuO/Pd catalysts possess outstanding stability and superior tolerance to CO species. The remarkably electrochemical catalysis performance of HLN CuO/Pd catalysts is attributed to the unique lychee-nut–like open nanostructures and the mutual interaction between Pd and CuO support, which optimizing the electronic structure.