Establishing structure/property relationships in atomically dispersed Co–Fe dual site M–Nx catalysts on microporous carbon for the oxygen reduction reaction
| Autor: | Jiapeng Liu, Muhammad Zubair, Zheng Wang, Francesco Ciucci, Kai Wang, Lars Thomsen, Ligui Li, Joshua Wright, Nicholas M. Bedford, Zhenghua Tang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Substrate (chemistry) chemistry.chemical_element 02 engineering and technology General Chemistry Microporous material Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis Adsorption Chemical engineering chemistry General Materials Science Density functional theory 0210 nano-technology Carbon |
| Zdroj: | Journal of Materials Chemistry A. 9:13044-13055 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Coupled metal–nitrogen–carbon (M–Nx–C) materials show great promise as platinum-group-metal (PGM) free catalysts for the oxygen reduction reaction (ORR). Herein, we report a facile strategy to construct atomically dispersed Co–Fe dual sites enriched on the surface of nitrogen doped microporous carbon (NC) as an efficient electrocatalyst for ORR. Synchrotron X-ray techniques indicate that the Co and Fe atoms are strongly correlated while further revealing that the longer-range lattice structure of NC is highly tunable. Density functional theory calculations reveal that the Co–Fe dimers are incorporated in the slightly disordered NC substrate, providing a lower adsorption free energy for O2. The as-prepared CoFe–NC catalyst exhibited excellent ORR activities, while a CoFe–NC based zinc–air battery exhibited a power density of 115 mW cm−2 and a specific capacity of 791 mA h g−1. This work showcases a straightforward methodology for creating atomically dispersed catalysts and illustrates the importance of understanding how dual metal sites impact electrocatalytic activity. |
| Databáze: | OpenAIRE |
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