Lewis acidity controlled heme catalyst for lithium-oxygen battery
| Autor: | Jong-Seok Park, Tae Yong Kim, Jang Wook Choi, Jongheop Yi, Jaeho Shin, Sung Eun Jerng, Seongjun Bae |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Battery (electricity)
Materials science Thiocyanate Renewable Energy Sustainability and the Environment Ligand Inorganic chemistry Oxygen evolution Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry General Materials Science Lithium Lewis acids and bases 0210 nano-technology |
| Zdroj: | Energy Storage Materials. 19:16-23 |
| ISSN: | 2405-8297 |
| Popis: | Despite their high theoretical energy density, lithium-oxygen (Li−O2) batteries suffer from limited cyclability originating from poor charging efficiency. In an effort to overcome this critical issue, a variety of catalysts have been introduced, but much room still remains for further advancement in catalyst design. By benchmarking hemoglobin in red blood cells that carry oxygen at a well-defined center of the molecular cage, herein, we report heme as an air-cathode catalyst with iron (Fe) active sites. Furthermore, the coordination of electron-withdrawing ligands, such as thiocyanate (S C N) and azide (N3), to the Fe center enhances its Lewis acidity to weaken the binding of oxygen intermediates (O2∗) towards more facile decomposition of the main discharging product (Li2O2). Density functional theory calculations and surface energy analysis of Fe coherently support the advantageous role of the ligand engineering in enhancing the reversibility of a Li−O2 battery. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect