Electrochemical behavior and electrodeposition of zirconium in molten LiCl-KCl eutectic saltLiCl-KCl 공융염 환경 내 지르코늄의 전기화학적 거동 및 전착 특성 규명

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dc.contributor.advisorYun, Jong-Il-
dc.contributor.advisor윤종일-
dc.contributor.authorCha, Han Lim-
dc.date.accessioned2023-06-22T19:34:20Z-
dc.date.available2023-06-22T19:34:20Z-
dc.date.issued2023-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=1030647&flag=dissertationen_US
dc.identifier.urihttp://hdl.handle.net/10203/308657-
dc.description학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2023.2,[vi, 96 p. :]-
dc.description.abstractIn order to develop electrometallurgical recycling processes of spent nuclear fuel and used Zr-alloy fuel cladding, it is necessary to clearly understand the electrochemical behavior and electrodeposition characteristics of Zr in molten LiCl-KCl eutectic salt. In this dissertation, a complete understanding of the redox mechanism of Zr and the development of a technique that selectively electrodeposits Zr metal on the electrode are achieved. First, the pulsed potential electrodeposition of the Zr species is demonstrated. A new reduction step of Zr species is discovered by cyclic-voltammetry analysis with a Zr electrode. Based on the cyclic voltammetry results, pulsed potential electrodepositions are performed in each reduction step. The characterization result of deposits confirmed that Zr metal could be selectively deposited on the W electrode. Subsequently, the oxidation mechanism of Zr is studied by utilizing Zr as the electrode for anodic dissolution experiments. A real-time optical monitoring system is utilized for optically scrutinizing the dissolution processes. The formation of a thin film layer on the Zr electrode is observed during passive dissolution. Also, a unique phenomenon is reported: an agglomerate is formed on the Zr electrode surface during transpassive dissolution. The chemical analysis results show that the agglomerate consists of potassium hexachlorozirconate (K2ZrCl6) and LiCl-KCl. The agglomerate formation is due to the Zr(IV) solubility limit in molten LiCl-KCl eutectic salt.-
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectZirconium▼aMolten LiCl-KCl eutectic salt▼aRedox mechanism▼aElectrodeposition▼aReal-time optical monitoring▼aPulsed potential electrodeposition-
dc.subject지르코늄▼aLiCl-KCl 공융염▼a산화환원 메커니즘▼a전착▼a실시간 광학 모니터링▼a펄스전압전착법-
dc.titleElectrochemical behavior and electrodeposition of zirconium in molten LiCl-KCl eutectic salt-
dc.title.alternativeLiCl-KCl 공융염 환경 내 지르코늄의 전기화학적 거동 및 전착 특성 규명-
dc.typeThesis(Ph.D)-
dc.identifier.CNRN325007-
dc.description.department한국과학기술원 :원자력및양자공학과,-
dc.contributor.alternativeauthor차한림-
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