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- Liu, Jia, et al.
(författare)
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Accelerated Electrochemical Decomposition of Li2O2 under X-ray Illumination
- 2013
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Ingår i: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185 .- 1948-7185. ; 4:23, s. 4045-4050
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Tidskriftsartikel (refereegranskat)abstract
- This work presents the first report detailing the effect of X-rays on the electrochemical decomposition of Li2O2, which is the main reaction during the charging process in a Li-O-2 battery. An operando synchrotron radiation powder X-ray diffraction (SR-PXD) experiment was performed. The results indicate that the electrochemical decomposition of Li2O2 is dramatically accelerated under X-ray irradiation. The accelerated decomposition of Li2O2 follows a zero-order reaction, and the decomposition rate constant is proportional to the intensity of X-ray used. A mechanism for the electrochemical decomposition of Li2O2 under X-ray irradiation is proposed. These results give an insight into the charging process in Li-O-2 batteries.
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2. |
- Liu, Jia, et al.
(författare)
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Pt/α-MnO2 nanotube : a highly active electrocatalyst for Li-O2 battery
- 2014
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Ingår i: Nano Energy. - : Elsevier. - 2211-2855. ; 10, s. 19-27
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Tidskriftsartikel (refereegranskat)abstract
- The preparation of α-MnO2 nanotubes (M-NT) decorated with platinum nanoparticles (Pt/M-NT) by a simple reduction and mechanical stirring method is presented in this work, which aims to design a highly active catalyst for the Li-O2 battery. The obtained samples were characterized by XRD, SEM, TEM, BET, and XPS techniques. The electrocatalytic performance of the prepared samples was evaluated by tracking the decomposition of Li2O2 during the charging process in a Li-O2 cell using in situ XRD and operando SR-PXD, which gave direct and time resolved information during the whole process. The results indicated that Pt nanoparticles were uniformly dispersed on the surface of M-NT. Even a small amount (1 wt%) of Pt on M-NT did largely enhance the kinetics of the charging process. A cell with 5 wt% Pt/M-NT showed the highest catalytic activity and lowest charging potential. The decomposition of Li2O2 during the charging process in a Li-O2 cell with 5 wt% Pt/M-NT followed a zero-order reaction. This promoting effect from the supported nanocatalyst can be attributed to the high surface area, highly dispersed and uniform Pt deposition, and proper surface state modifications.
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3. |
- Roberts, Matthew, et al.
(författare)
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Increased Cycling Efficiency of Lithium Anodes in Dimethyl Sulfoxide Electrolytes For Use in Li-O-2 Batteries
- 2014
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Ingår i: ECS ELECTROCHEM LETT. - : The Electrochemical Society. - 2162-8726. ; 3:6, s. A62-A65
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Tidskriftsartikel (refereegranskat)abstract
- High lithium cycling efficiencies are required if a metal anode system is to be considered for use in Li-O-2 batteries. In this work electrolyte additives (0.3 M LiNO3 and 0.14 M VC) were used to increase the efficiency from 25 to 82.5% in the topical DMSO based electrolyte. Furthermore, we show that oxygen also acts to improve the cycling efficiency to 87%. This work highlights the importance of anode considerations in the development of metal O-2 batteries in alternative solvents (DMSO, Acetonitrile and DMA) and suggests realistic strategies for performance improvements. (C)The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. All rights reserved.
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