Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Hong, Seung Tae | - |
| dc.contributor.author | Kwak, Hun Ho | - |
| dc.date.accessioned | 2017-05-10T08:50:15Z | - |
| dc.date.available | 2016-05-18T00:00:00Z | - |
| dc.date.issued | 2014 | - |
| dc.identifier.uri | http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262536 | en_US |
| dc.identifier.uri | http://hdl.handle.net/20.500.11750/1344 | - |
| dc.description.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 | - |
| dc.description.tableofcontents | 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 |
- |
| dc.format.extent | 27 | - |
| dc.language | eng | - |
| dc.publisher | DGIST | - |
| dc.subject | Submicron-sized MoO3 | - |
| dc.subject | beaker type three electrode measurement cell | - |
| dc.subject | activated carbon | - |
| dc.subject | pseudo two-phase reaction | - |
| dc.title | Studies on electrochemical magnesiumintercalation in molybdenum trioxide | - |
| dc.title.alternative | MoO3 에 관한 마그네슘이온 전기화학적 탈/삽입 연구 | - |
| dc.type | Thesis | - |
| dc.identifier.doi | 10.22677/thesis.2262536 | - |
| dc.description.alternativeAbstract | MoO3 를 working electrode 로 사용하여, 마그네슘 이온 전기화학적 탈/삽입 연구를 진행 하였다. Oxlic acid 합성 방법을 이용하여, Submicron-sized 의 MoO3 를 합성하였고, SEM 과 XRD 로 확인하였다. 실험은 beaker type-cell, three electorecell test 을 진행하였으며, reference electrode 로 Ag/Ag+ , counter electrode 로 activate carbon 사용하였다. Activate carbon 을 이용함으로써, 기존 유기전해액에서는 실험이 불가능했던, host 물질에 대한 magnesium intercalation 실험을 가능케하였다. MoO3 에 magnesium intercalation 은 cyclic voltammetry, galvanostic discharge/charge, powder XRD, EDS 로 측정 및 분석을 하였다. Cyclic voltagramms 에서 가역적인 환원, 산화 픽이 관찰 되었으며, 충방전 실험 또한, magnesium insertion 과 de insetion 이 확인되었다. XRD 분석결과, 충방전 과정에서 MoO3 는 two-phase reacion 을 갖는다는 것을 확인하였고, 충방전이 진행됨에 따라, 결정성이 나빠진다는 것을 관찰 할 수 있었다. ⓒ 2014 DGIST | - |
| dc.description.degree | Master | - |
| dc.contributor.department | Energy Systems Engineering | - |
| dc.contributor.coadvisor | Kim, Jae Hyeon | - |
| dc.date.awarded | 2014. 2 | - |
| dc.publisher.location | Daegu | - |
| dc.description.database | dCollection | - |
| dc.date.accepted | 2016-05-18 | - |
| dc.contributor.alternativeDepartment | 대학원 에너지시스템공학전공 | - |
| dc.contributor.affiliatedAuthor | Kwak, Hun Ho | - |
| dc.contributor.affiliatedAuthor | Hong, Seung Tae | - |
| dc.contributor.affiliatedAuthor | Kim, Jae Hyeon | - |
| dc.contributor.alternativeName | 곽헌호 | - |
| dc.contributor.alternativeName | 홍승태 | - |
| dc.contributor.alternativeName | 김재현 | - |
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