Atomic-level tuning of Co–N–C catalyst for high-performance electrochemical H2O2 production
| Autor: | Vladimir Efremov, Sung-Pyo Cho, Jong Suk Yoo, Wytse Hooch Antink, Jiheon Kim, S. H. Lee, Byounghoon Lee, Heejong Shin, Yung-Eun Sung, Subin Park, Euiyeon Jung, Kug-Seung Lee, Taeghwan Hyeon, Hyeon Seok Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Mechanical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis law.invention chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials law Anthraquinone process Moiety Reversible hydrogen electrode General Materials Science 0210 nano-technology Hydrogen peroxide |
| Zdroj: | Nature Materials. 19:436-442 |
| ISSN: | 1476-4660 1476-1122 |
| Popis: | Despite the growing demand for hydrogen peroxide it is almost exclusively manufactured by the energy-intensive anthraquinone process. Alternatively, H2O2 can be produced electrochemically via the two-electron oxygen reduction reaction, although the performance of the state-of-the-art electrocatalysts is insufficient to meet the demands for industrialization. Interestingly, guided by first-principles calculations, we found that the catalytic properties of the Co–N4 moiety can be tailored by fine-tuning its surrounding atomic configuration to resemble the structure-dependent catalytic properties of metalloenzymes. Using this principle, we designed and synthesized a single-atom electrocatalyst that comprises an optimized Co–N4 moiety incorporated in nitrogen-doped graphene for H2O2 production and exhibits a kinetic current density of 2.8 mA cm−2 (at 0.65 V versus the reversible hydrogen electrode) and a mass activity of 155 A g−1 (at 0.65 V versus the reversible hydrogen electrode) with negligible activity loss over 110 hours. Producing H2O2 electrochemically currently use electrocatalysts that are insufficient to meet the demands for industrialization. A single-atom electrocatalyst with an optimized Co–N4 moiety incorporated in nitrogen-doped graphene is shown to exhibit enhanced performance for H2O2 production. |
| Databáze: | OpenAIRE |
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