Magneli-Phase Ti4O7 Nanosphere Electrocatalyst Support for Carbon-Free Oxygen Electrodes in Lithium-Oxygen Batteries
- Authors
- Lee, Seun; Lee, Gwang-Hee; Kim, Jae-Chan; Kim, Dong-Wan
- Issue Date
- 3월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Magneli phase; carbon-free; Ti4O7; RuO2; Li-O-2 batteries
- Citation
- ACS CATALYSIS, v.8, no.3, pp.2601 - 2610
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS CATALYSIS
- Volume
- 8
- Number
- 3
- Start Page
- 2601
- End Page
- 2610
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76842
- DOI
- 10.1021/acscatal.7b03741
- ISSN
- 2155-5435
- Abstract
- Lithium-oxygen batteries have been considerably researched due to their potential for high energy density compared to some rechargeable batteries. However, it is known that the stability of a carbon-based oxygen electrode is insufficient owing to the promotion of carbonate formation, which results in capacity fading and large overpotential in lithium-oxygen batteries. To improve the chemical stability in organic-based electrolytes, alternative electrocatalyst support materials are required. The Ti-O crystal system appears to provide a good compromise between electrochemical performance and cost and is thus an interesting material for further investigation. Here, we investigate a carbon-free electrode with the goal of identifying routes for its successful optimization. To replace carbon materials as an electrocatalyst support, Magneli Ti4O7 nanospheres were synthesized from anatase TiO2 nanospheres via a controlled thermochemical reduction. The Magna Ti4O7 nanospheres demonstrated effective overpotential characteristics (1.53 V) compared to the anatase TiO2 nanospheres (1.91 V) during charge-discharge cycling at a current rate of 100 mA g(-1). Additionally, RuO2@Magneli-Ti4O7 nanospheres were prepared as a bifunctional catalyst-containing oxygen electrode for lithium-oxygen batteries, providing a remarkably reduced overpotential (0.9 V).
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