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Highly efficient Ru/MnO2 nano-catalysts for Li-O2 batteries: Quantitative analysis of catalytic Li2O2 decomposition by operando synchrotron X-ray diffraction
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry. Northeast Normal Univ, Natl & Local United Engn Lab Power Batteries, Fac Chem, Changchun 130024, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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2017 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 352, 208-215 p.Article in journal (Refereed) Published
Abstract [en]

In-situ or operando quantitative analysis is very important for Li-O2 batteries, in order to properly, accurately and comprehensively evaluate electrocatalysts and characterize Li-O2 electrochemistry in real-time. Synchrotron XRD can provide much higher X-ray intensity and time resolution than traditional in-house diffractometers, and therefore can contribute to quantitative analysis for Li-O2 batteries. Here, operando synchrotron XRD is further developed to quantitatively study Li-O2 batteries with nano catalysts, Ru/MnO2. The time-resolved oxygen evolution reaction (OER) kinetics for Li-O2 cells with Ru/MNT was systematically investigated using operando synchrotron radiation powder X-ray diffraction (SR-PXD). Li2O2 decomposition in the electrodes with Ru/MNT catalysts during galvanostatic and potentiostatic charge processes followed pseudo-zero-order kinetics and showed ideal Coulombic efficiency (close to 100%). Furthermore, it was found that the OER kinetics for a cell with 2 wt% Ru/MNT charged at a constant potential of 4.3 V was even faster than that for a cell with the same amount of pure Ru nanoparticles, which have been considered as a highly active catalyst for Li-O2 batteries. These results indicated that Ru/MNT with a special nanostructure represented a very efficient electrocatalyst for promoting the OER in Li-O2 batteries. We also demonstrate that synchrotron radiation XRD can "highlight" a way to quantitative analysis for Li-O2 batteries.

Place, publisher, year, edition, pages
2017. Vol. 352, 208-215 p.
Keyword [en]
Ru nanoparticle, MnO2 nanotube, Li-O-2 battery, Electrocatalyst, Oxygen evolution reaction, Operando synchrotron radiation powder X-ray diffraction (SR-PXD)
National Category
Materials Chemistry Other Chemical Engineering
Identifiers
URN: urn:nbn:se:uu:diva-324237DOI: 10.1016/j.jpowsour.2017.03.127ISI: 000401206100024OAI: oai:DiVA.org:uu-324237DiVA: diva2:1110396
Funder
Swedish Research Council, 2012-4681Swedish Energy Agency, 2010-000414
Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2017-06-15Bibliographically approved

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Liu, JiaMa, YueGustafsson, TorbjörnEdström, KristinaZhu, Jiefang

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