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Bimetallic Metal-Organic Frameworks as Efficient Cathode Catalysts for Li-O-2 Batteries

Title
Bimetallic Metal-Organic Frameworks as Efficient Cathode Catalysts for Li-O-2 Batteries
Author
이윤정
Keywords
Li-O-2 battery; MOP-74; bimetallic MOP; bifunctional catalyst; Mn; Co
Issue Date
2018-01
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 10, no. 1, page. 660-667
Abstract
Metal-organic frameworks (MOFs) have the potential to improve the electrochemical performance of Li-O-2 batteries with high O-2 accessibility and catalytic activity of the open metal sites. Here, we explored bimetallic MnCo-MOF-74 as a cathode catalyst in Li-O-2 batteries. MnCo-MOF-74 was synthesized with the Mn to Co ratio of 1:4 by a simple hydrothermal reaction. Compared to monometallic Mn-MOF-74 and Co-MOF-74 with only single catalytic activity for LiOH formation or oxygen evolution reactions, bimetallic MnCo-MOF-74 demonstrated a capability to facilitate improved reversibility and efficiency during both discharge and charge cycles. Benefitting from the porous structure of the MOF as well as the complementary contribution from both Mn- and Co-metal clusters, MnCo-MOF-74 outperformed Mn-MOF-74 and Co-MOF-74. A high full discharge capacity of 11 150 mAh g(-1) at 200 mA g(-1) was achieved in MnCo-MOF-74. During the cycling test, MnCo-MOF-74 stably delivered a limited discharge capacity of 1000 mAh g(-1) for 44 cycles at 200 mA g(-1), which is remarkably longer than those of carbon black, Mn-MOF-74, and Co-MOF-74 with cycle lives of 8, 22, and 18 cycles, respectively.
URI
https://pubs.acs.org/doi/10.1021/acsami.7b15499http://repository.hanyang.ac.kr/handle/20.500.11754/117086
ISSN
1944-8244; 1944-8252
DOI
10.1021/acsami.7b15499
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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