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A new perspective of the ruthenium ion: a bifunctional soluble catalyst for high efficiency Li-O-2 batteries

Title
A new perspective of the ruthenium ion: a bifunctional soluble catalyst for high efficiency Li-O-2 batteries
Author
선양국
Keywords
LITHIUM-OXYGEN BATTERIES; REDOX MEDIATOR; CELLS; ARCHITECTURE; ELECTROLYTE; REDUCTION; BEHAVIOR; LI2O2
Issue Date
2017-06
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 5, no. 30, page. 15512-15516
Abstract
The slow kinetics of Li-O-2 batteries cause a large overpotential, which leads to low round-trip efficiency and poor cyclability. Applying a suitable bifunctional catalyst can be an effective way to solve this problem. We anticipated that the ruthenium ion dissolved in the electrolyte will not only overcome the disadvantages of solid phase catalysts, but also reduce the overpotential for both charge and discharge. This is possible due to the suitable redox potential of the ruthenium ion, which effectively reduced the oxygen evolution reaction (OER) overpotential, and the affinity between the ruthenium ion and oxygen, which facilitated the oxygen reduction reaction (ORR) and suppressed the degradation of the cathode. Here, we propose a new soluble catalyst, ruthenium bromide, for Li-O-2 batteries. The battery using ruthenium bromide clearly exhibited enhanced cycling performance, increasing round-trip efficiency (from 68.2% to 80.5%) and rate capability. A new understanding and application of the soluble ruthenium catalyst, which is commonly used as a solid catalyst, will not only overcome the existing problems but also provide a promising platform for Li-O-2 batteries.
URI
https://pubs.rsc.org/en/content/articlelanding/2017/TA/C7TA04070A#!divAbstracthttps://repository.hanyang.ac.kr/handle/20.500.11754/114502
ISSN
2050-7488; 2050-7496
DOI
10.1039/c7ta04070a
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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