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명노승,Myeong, No Seung Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.9
Ni, Fe and NiFe alloy thin films were electrodeposited at a polycrystalline Au surface using a range of electrolytes and potentials. Coulometry and EQCM were used for real-time monitoring of electroplating efficiency of the Ni and Fe. The plating efficiency of NiFe alloy thin films was computed with the aid of ICP spectrometry. In general, plating efficiency increased to a steady value with deposition time. Plating efficiency of Fe was lower than that of Ni at -0.85 and -1.0 V but the efficiency approached to the similar plateau value to that of Ni at more negative potentials. The films with higher content of Fe showed different stripping behavior from the ones with higher content of Ni. Finally, compositional data and real-time plating efficiency are presented for films electrodeposited using a range of electrolytes and potentials.
수은 막전극을 이용한 수용액 중 과염소산이온의 전기화학적 환원
명노승,김은영,지형우,금나래,이인숙,팽기정,Myung, Noseung,Kim, Eun Young,Jee, Hyung-Woo,Keum, Narae,Rhee, Insook,Paeng, Ki-Jung 한국전기화학회 2016 한국전기화학회지 Vol.19 No.3
A method for electrochemical degradation of the perchlorate anion ($ClO_4{^-}$) using mercury film electrode has been studied. Electrochemical method has relatively simple pre-treatment. However, electrochemical method should avoid interference from hydrogen evolution at the applied potential to degradation of perchlorate ion, and thus applied electrode should have large hydrogen overvoltage which suppressed the hydrogen evolution at the working reduction potential to prevent hydrogen evolution. In this study, we used mercury film electrode as a working electrode which has a large overvoltage. Ag / AgCl (sat. NaCl) was used as a reference electrode, and platinum was used as a counter electrode. Mercury film electrode was made by cyclic voltammetry (CV) method. The deposition time was decided as 10 minute, and the stability of the mercury electrode in perchlorate solution was confirmed by CV. The reduction potential of perchlorate was checked by using CV method, and decomposition of perchlorate was performed by using chronoamperometric (CA) method. Also, ion chromatography (IC) was used to confirm the degradation rates of perchlorate. 과염소산이온의 전기화학적 분해에 관한 연구가 진행되었다. 전기화학적 방법은 비교적 단순한 전처리 방법으로 가능하다. 하지만 전기화학적 방법은 과염소산이온이 분해되는 전압을 가해주었을 때 수소발생으로 인한 방해가 발생하기 때문에 사용하는 전극의 수소 과전압이 큰 것을 사용하여 수소발생을 줄이는 것이 요구되어 왔다. 본 연구에서는 수소 과전압이 큰 수은박막전극을 작업 전극으로 사용하였다. Ag / AgCl (sat. NaCl) 전극을 기준전극으로 사용하였으며 Pt를 상대전극으로 사용하였다. 수은박막전극은 순환 전압-전류법(Cyclic voltammetry, CV)으로 제작하였는데 과염소산 용액에서의 CV를 고려하여 수은박막전극의 안정성을 위해 10분 동안 전착시켰다. 과염소산이온의 환원전위는 CV 방법에 의해 설정되었고, 분해실험은 시간대 전류법 (Chronoamperometry, CA)로 시행하였다. 과염소산이온의 분해율 확인을 위해 이온 크로마토그래피(Ion chromatography, IC)를 사용하였다.
Compositional Analyses of Electrodeposited II-VI Compound Semiconductor Thin Films
이명진,최홍진,전종호,명노승 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.2
Cd+Se 혼합물의 열화학적 성질을 DSC를 이용하여 조사하였다. Cd과 Se분말을 이용하여 분석한 결과 Cd이 녹기 전 까진 CdSe의 형성이 관측되지 않았지만, Cd의 녹는 점 이상에서는 온도와 반응시간에 따라 상당한 양의 CdSe가 만들어지는 것을 알 수 있었다. 이상의 방법을 토대로 전기 화학적으로 합성한 CdSe박막의 조성을 분석하였다. 일정 전압에서 합성한 CdSe 박막을 DSC로 분석한 결과 Cd,Se 그리고 CdSe의 양을 각각 분석할 수 있었다. The thermochemistry of the condensed-phase Cd+Se=CdSe system was studied by differential scanning calorimetry(DSC). Formation of CdSe was not initiated until fusion of Cd reactant. However, increase of temperature or reaction time resulted in the formation of CdSe although there was no clear exothemic peak. Based on the thermochemistry of Cd+Se system, compositional analysis of electrodeposited CdSe thin films by the DSC was described. Potentiostatic deposition of CdSe thin films contained free Cd, free Se and CdSe depending on the deposition potential. Interesting features of Se thermochemistry were also described.
명노승,전종호,Krishnan Rajeshwar 建國大學校 自然科學硏究所 1997 建國自然科學硏究誌 Vol.8 No.-
This short Note shows that a simple and general relationship exists for the dilution of molal solutions analogous to molarity and normality; X x W = X' x W' wherein X and W are the weight fraction of solute and mass of solution and the primed quantities refer to those after dilution. Two specific examples are given to show the utilities of the expression.
Photoelectrochemical Deposition of CdZnSe Thin Films on the Se-Modified Au Electrode
Sunyoung Ham,명노승,이웅기,팽기정,Soyeon Jeon 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Photoelectrochemical deposition of CdZnSe thin films on the Se-modified Au electrode using electrochemical quartz crystal microgravimetry (EQCM) and voltammetry is described. Corrosion of pre-deposited Se electrodes by illumination at a fixed potential resulted in Se²- species, which was manifest from the EQCM frequency changes. Se²- species generated from the photocorrosion reacted with Cd²+ and Zn²+ ions in the electrolyte to form CdZnSe films on the Au electrode. The effect of electrolyte composition on the composition and band gap of CdZnSe films was studied in detail. Also, photoelectrochemistry, EDX, Raman spectroscopy were used for the characterization of CdZnSe thin films.