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Studies on electrochemical magnesiumintercalation in molybdenum trioxide

Title
Studies on electrochemical magnesiumintercalation in molybdenum trioxide
Translated Title
MoO3 에 관한 마그네슘이온 전기화학적 탈/삽입 연구
Authors
Kwak, Hun Ho
DGIST Authors
Kwak, Hun Ho; Hong, Seung Tae; Kim, Jae Hyeon
Advisor(s)
Hong, Seung Tae
Co-Advisor(s)
Kim, Jae Hyeon
Issue Date
2014
Available Date
2016-05-18
Degree Date
2014. 2
Type
Thesis
Keywords
Submicron-sized MoO3beaker type three electrode measurement cellactivated carbonpseudo two-phase reaction
Abstract
Electrochemical magnesium ion intercalation chemistry of MoO3 has been studied in this work. Submicron-sized MoO3 has been synthesized from commercial micron-sized MoO3 by a facile oxalic acid method, which was confirmed by SEM and XRD. A beaker-type three-electrode measurement cell was designed using activated carbon as the counter electrode, which enabled the test of magnesium intercalation into the host material at the working electrode without problem when conventional organic electrolytes are used. The electrochemical magnesium intercalation into MoO3 has been confirmed by cyclic voltammetry, galvanostatic discharge/charge, powder XRD and EDS measurements. Reversible reduction and oxidation peaks were obseved in cyclic voltagramms as well as discharge/charge cycles, corresponding to magnesium insertion and deinsertion, respectively. The reversibility was also confirmed by XRD measurement which also showed that a new phase is formed during the discharge and the discharge/charge processes are a pseudo two-phase reaction. With cycles, a degradation in crystallinity was observed. ⓒ 2014 DGIST
Table Of Contents
1.Introduction 1 -- 1.1 Principle of Magnesium battery 4 -- 2. Experiments 5 -- 2.1 Synthesis of submicron-sized MoO3 5 -- 2.2 Preparation of electrodes and electrolyte, and materials characterization 5 -- 2.3 Electrochemical cell configuration and characterization 6 -- 3. Results and Discussion 9 -- 3.1 Materials preparation 9 -- 3.1.1 Synthesis of submicron-sized MoO3 9 -- 3.2 Galvanostatic measurements 11 -- 3.3 Structural change during first magnesium insertion process 14 -- 3.4 Structural change during first magnesium de-insertion process 17 -- 3.5 Cyclic voltammetry of MgxMoO3 20 -- 4. Conclusions 22 -- References 24 -- 요약문 25 -- Acknowledgement 27
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262536
http://hdl.handle.net/20.500.11750/1344
DOI
10.22677/thesis.2262536
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Files:
Collection:
Energy Science and EngineeringThesesMaster


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