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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In 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.
Advisors
Yun, Jong-Ilresearcher윤종일researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2023
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2023.2,[vi, 96 p. :]

Keywords

Zirconium▼aMolten LiCl-KCl eutectic salt▼aRedox mechanism▼aElectrodeposition▼aReal-time optical monitoring▼aPulsed potential electrodeposition; 지르코늄▼aLiCl-KCl 공융염▼a산화환원 메커니즘▼a전착▼a실시간 광학 모니터링▼a펄스전압전착법

URI
http://hdl.handle.net/10203/308657
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=1030647&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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