Abstract
Structure-engineered platinum-based nanoframes (NFs) at the atomic level can effectively improve the catalytic performance for fuel cells and other heterogeneous catalytic fields. We report herein, a microwave-assisted wet-chemical method for the preparation of platinum-copper-cobalt NFs with tunable defect density and architecture, which exhibit enhanced activity and durability towards the electro-oxidation reactions of methanol (MOR) and formic acid (FAOR). By altering the reduction/capping agents and thus the nucleation/growth kinetics, trimetallic platinum-copper-cobalt hexapod NFs with different density high-index facets are achieved. Especially, the rough hexapod nanoframes (rh-NFs) exhibit excellent specific activities towards MOR and FAOR, 7.25 and 5.20 times higher than those of benchmark Pt/C, respectively, along with prolonged durability. The excellent activities of the rh-NFs are assigned to a synergistic effect, including high density of defects and high-index facets, suitable d-band center, and open-framework structure. This synergistic working mechanism opens up a new way for enhancing their electrocatalytic performances by increasing defect density and high-index facets in open-framework platinum-based NFs.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 21808079 and 21878121), Natural Science Foundation of Shandong Province (No. ZR2017BB029), China Postdoctoral Science Foundation (No. 2017M610405), International Postdoctoral Exchange Fellowship Program Between Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, OCPC and University of Jinan.
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Yang, S., Li, S., Song, L. et al. Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties. Nano Res. 12, 2881–2888 (2019). https://doi.org/10.1007/s12274-019-2530-5
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DOI: https://doi.org/10.1007/s12274-019-2530-5