Defect-density control of platinum-based nanoframes with high-index facets for enhanced electrochemical properties
| Autor: | Yipin Lv, Raphael Francesco Praeg, Li Shuna, Daowei Gao, Yang Shaohan, Guozhu Chen, Chunsheng Li, Lianghao Song, Zhongyao Duan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Growth kinetics Formic acid High index Nucleation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Chemical engineering General Materials Science Methanol Electrical and Electronic Engineering 0210 nano-technology Platinum |
| Zdroj: | Nano Research. 12:2881-2888 |
| ISSN: | 1998-0000 1998-0124 |
| DOI: | 10.1007/s12274-019-2530-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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