Antiperovskite Intermetallic Nanoparticles for Enhanced Oxygen Reduction
| Autor: | Haoming Shen, Wenhan Guo, Kexin Zhang, Yingxiao Wu, Bingjun Zhu, Zibin Liang, Ruqiang Zou, Hao Zhang, Wei Xia |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
010405 organic chemistry Intermetallic Nanoparticle chemistry.chemical_element General Medicine General Chemistry 010402 general chemistry 01 natural sciences Oxygen Catalysis 0104 chemical sciences Nanomaterials Antiperovskite Chemical engineering chemistry Desorption Metal-organic framework |
| Zdroj: | Angewandte Chemie International Edition. 59:1871-1877 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201911943 |
| Popis: | Antiperovskite Co3 InC0.7 N0.3 nanomaterials with highly enhanced oxygen reduction reaction (ORR) performance were prepared by tuning nitrogen contents through a metal-organic framework (MOF)-derived strategy. The nanomaterial surpasses all reported noble-metal-free antiperovskites and even most perovskites in terms of onset potential (0.957 V at J=0.1 mA cm-2 ) and half-wave potential (0.854 V). The OER and zinc-air battery performance demonstrate its multifunctional oxygen catalytic activities. DFT calculation was performed and for the first time, a 4 e- dissociative ORR pathway on (200) facets of antiperovskite was revealed. Free energy studies showed that nitrogen substitution could strengthen the OH desorption as well as hydrogenation that accounts for the enhanced ORR performance. This work expands the scope for material design via tailoring the nitrogen contents for optimal reaction free energy and hence performance of the antiperovskite system. |
| Databáze: | OpenAIRE |
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