Effect of Transition Metal Oxide Cathodes on the Oxygen Evolution Reaction in Li–O2 Batteries
| Autor: | Loza F. Tadesse, Donald S. Bethune, Kumar Virwani, Dahyun Oh, Leslie E. Thompson, Nagaphani Aetukuri, Ho-Cheol Kim, M. Jurich |
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| Rok vydání: | 2017 |
| Předmět: |
Battery (electricity)
Passivation Chemistry Inorganic chemistry Oxygen evolution Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Cathode 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound General Energy Transition metal law Physical and Theoretical Chemistry 0210 nano-technology Deposition (law) |
| Zdroj: | The Journal of Physical Chemistry C. 121:1404-1411 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Li–oxygen batteries could provide energy density that is up to five times greater than that of state-of-the-art Li-ion batteries. However, Li–oxygen cell rechargeability is limited by cathode passivation due to nonconductive discharge products. Despite efforts to efficiently oxidize these products, oxygen recovery remains poor at potentials where cell constituents are stable. Transition metal oxide (TMO) cathodes have shown low charging potentials, but a correspondence to improved oxygen evolution efficiency is debated. This is because the deposition of electrically insulating Li2O2 during the battery discharge could passivate the TMO surfaces and render them inactive for catalyzing oxygen evolution during charge. Contrary to this, we show that TMOs enable charging at low overpotentials without compromising the oxygen evolution efficiency. Charge potentials are lowered by 130–400 mV in batteries employing TMO-based cathodes compared to carbon-only cathodes. By a combination of current-sensing atomic force... |
| Databáze: | OpenAIRE |
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