Core–shell nanoparticles with tensile strain enable highly efficient electrochemical ethanol oxidation
| Autor: | Zhixue Zhang, Kai Liu, Shumeng Zhang, Tao Cheng, Qing Zhang, Yiming Lu, Yilan Jiang, Moxuan Liu, Zhaojun Liu, Chuanbo Gao, Xiaoxiao Wang, Miao Xie |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Kinetics Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Anode Chemical engineering Alcohol oxidation General Materials Science Ethanol fuel 0210 nano-technology Selectivity |
| Zdroj: | Journal of Materials Chemistry A. 9:15373-15380 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | The ethanol oxidation reaction (EOR), the anode reaction of direct ethanol fuel cells, suffers from sluggish oxidation kinetics and low selectivity toward complete oxidation to CO2. The key to solving the above problems is to design and synthesize high-performance catalysts. In this work, we synthesize Ag@AgPd core–shell nanoparticles that exhibit a significant improvement in catalytic performance. Specifically, in 1.0 M KOH + 1.0 M EtOH, the mass activity of the Ag@AgPd core–shell catalyst reaches up to 12.7 A mgPd−1 with a significantly improved selectivity toward CO2 by 4.5 times compared with commercial Pd/C. This superior performance guarantees that this Ag@AgPd core–shell nanoparticle is among the best-reported catalysts. Mechanism study by density functional theory shows that the tensile strain that originates from the unique core–shell structure decreases the potential determining step by 39%, which plays the most important role in increasing the activity and selectivity. This work demonstrates the effect of the tensile strain in promoting the kinetics and selectivity of the EOR, which may serve as a guide for the design of highly efficient electrocatalysts for general alcohol oxidation reactions by controlled nanoparticle synthesis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|