• Korean Journal of Materials Research
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• v.5 no.7
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• pp.842-849
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• 1995

The effect of cathodic protection by the sacrificial anode attached to condenser waterbox of power plant was investigated using numerical analysis. The condenser is consisted of various materials. So in case of no protection, the serious galvanic corrosion between waterbox and tubesheet was observed. If sacrificial anodes were attached to the wall of waterbox or the area corroded galvanically, the large protection effect was showed. To demonstrate the validity of numerical analysis results, model test was executed. The numerical solution was consistent with the experimental vague well.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.321-321
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• 2015

해수 환경에 노출된 대부분의 금속재료는 직 간접적으로 부식의 영향을 받는다. 이와 같이 해수에 침지된 금속재료의 부식 방지에는 음극방식법이 주로 사용되고 있다. 과거의 음극방식 설계에는 양극 크기와 방식전류 밀도, 소모율 등 양극 자체에 대한 변수만이 고려되었으나, 20여 년 전부터는 해수 오염도, 수온 및 유속 등을 종합적으로 고려하여 설계하고 있다. 특히 대부분의 금속은 부식성 환경에서 생성된 부동태 피막이 해수 유동에 의해 파괴되면서 급속히 손상된다. 따라서 본 연구에서는 해수 특성을 고려한 최적의 소요방식전류밀도 선정을 위해 전기화학실험을 실시하였다. 실험 결과, 해수 온도 상승에 따라 확산속도가 빨라져 최적 방식 전류밀도가 증가하는 경향을 나타냈다.

• Korean Journal of Materials Research
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• v.6 no.4
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• pp.401-411
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• 1996

전기방식법중의 하나인 음극방식법은 많은 해수설비를 갖추고 있는 발전소에 적용되고 있는 설비지만 운용의 측면에서는 적절하지 못한 방식조건으로 많은 문제점이 노출되고 있다. 본 연구에서는 설비지만 운용의 측면에서는 적절하지 못한 방식조건으로 많은 문제점이 노출되고 있다. 본 연구에서는 해수설비중의 하나인 발전소 복수기의 음극방식설비를 해석 대상으로 하여 가장 많이 사용되는 희생양극 재질인 Zn 양극을 입구측 파이프, 수실벽 및 천장등 여러위치에 부착한 경우 전위분포 및 전류밀도분포를 구하여 최적방식조건을 찾아보았다. 또한 전류밀도값을 Faraday 법칙을 이용부식속도로 환산하여 galvanic 부식정도와 방식정도를 평가하였다. 그 결과 희생양극을 galvanic 부식이 심하게 일어날 것으로 예상되는 위치에 부착하면 방식효과가 가장 크게 나타남을 알 수 있었다.

• Applied Chemistry for Engineering
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• v.29 no.6
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• pp.635-644
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• 2018

Lithium ion batteries have been broadly used in various applications to our daily life such as portable electronics, electric vehicles and grid-scale energy storage devices. Significant efforts have recently been made on developing electrode materials for lithium ion batteries that meet commercial needs of the high energy density, light weight and low cost. In this review, we summarize the principles and recent research advances in cathode and anode materials for lithium ion batteries, and particularly emphasize electrode material designs and advanced characterization techniques.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.132.2-132.2
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• 2010

Mesoporous tinoxide ($SnO_2$) as anode materials for Li-ion battery were prepared by hydrothermal method and templating method using SBA-15 as template. And electrochemical properties of $SnO_2$ electrode were investigated with cyclic voltammogram (CV). The morphology and structures of $SnO_2$ were characterized by transmission electron microscopy (TEM) and X-ray diffractometer (XRD), respectively. The specific surface area was defined by $N_2$ adsorption with BET(Brunauer-Emmett-Teller) method. As a result, the surface area of mesoporous $SnO_2$ which was made from templating method is higher than the case of using hydrothermal method. In addition, in anodic performance, mesoporous $SnO_2$ which is prepared by templating method showed higher charge-discharge capasity compared to hydrothermal method and exhibited excellent stability over the entire cycle number. It was indicated that electrochemical performances of mesoporous $SnO_2$mainly affected to the structural features, such as specific surface area and porosity.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.13 no.4
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• pp.315-319
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• 2015

A high-throughput electrorefiner has been developed for commercialization use by enhancing the uranium recovery from the reduced metal which is produced from the oxide reduction process. It is necessary to scrap and effectively collect uranium dendrites from the surface of the solid cathode for high yield. When a steel electrode is used as the cathode in the electrorefining process, uranium is deposited and regularly stuck to the steel cathode during electrorefining. The sticking coefficient of a steel cathode is very high. In order to decrease the sticking coefficient of the steel cathode effectively, vibration mode was applied to the electrode in this study. Uranium dendrites were scraped and fell apart from the steel cathode by a vibration force. The vibrational scraping of the steel cathode was compared to the self-scraping of the graphite cathode. Effects of the applied current density and the vibration stroke on the scraping of the uranium dendrites were also investigated.

• Applied Chemistry for Engineering
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• v.29 no.6
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• pp.696-702
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• 2018

Recently, the current thermal battery technology needs new materials for electrodes in the power and energy density to meet various space and defense requirements. In this paper, to replace the pellet type Li(Si) anode having limitations of the formability and capacity, electrochemical properties of the lithium anode with high density for thermal batteries were investigated. The lithium anode (Li 17, 15, 13 wt%) was fabricated by mixing the molten lithium and iron powder used as a binder to hold the molten lithium at $500^{\circ}C$. The single cell with 13 wt% lithium showed a stable performance. The 2.06 V (OCV) of the lithium anode was significantly improved compared to 1.93 V (OCV) of the Li(Si) anode. Specific capacities during the first phase of the lithium anode and Li(Si) were 1,632 and $1,181As{\cdot}g^{-1}$, respectively. As a result of the thermal battery performance test at both room and high temperatures, the voltage and operating time of lithium anode thermal batteries were superior to those of using Li(Si) anode thermal batteries. The power and energy densities of Li anode thermal batteries were also remarkably improved.

• Electrical & Electronic Materials
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• v.10 no.7
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• pp.732-736
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• 1997

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 1998.11a
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• pp.81-81
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• 1998

• Electrical & Electronic Materials
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• v.35 no.3
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• pp.15-21
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• 2022