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RuO2-SnO2-IrO2/Ti 계 혼합산화물 전극의 양극산화에 대한 회토류원소의 영향
윤경석(Kyung Suk Yun),이진식(Jin Sik Lee),이철태(Chul Tae Lee) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
Adding of rare earth elements such as Ho₂O₃, Sm₂O₃, Er₂O₃, Y₂O₃, Nd₂O₃and La₂O₃ on the RuO₂-SnO₂-IrO₂/Ti mixed oxide electrode enhanced the durability of this mixed oxide electrode, respectively. In every case of the addition of various rare earth element, durability was enhanced and oxygen evolution overvoltage was decreased in order of Ho₂O₃>Sm₂O₃>Er₂O₃,>Y₂O₃>Nd₂O₃>La₂O₃. When 1 wt% of Ho₂O₃ oxide was doped especially, the oxygen evolution overvoltage of that electrode become lower than that of the mixed oxide electrode itself.
RuO2 - SnO2 - IrO2 /Ti 계 혼합산화물 전극의 양극산화 특성
이진식,이철태,윤경석 ( Jin Sik Lee,Chul Tae Lee,Kyung Suk Yun ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1
Anodic oxidation characteristics of RuO₂-SnO₂-IrO₂/Ti type mixed oxide electrode was investigated to find a new type electrode with the lower oxygen overpotential and higher stability for chloro-alkali industrial use. Electrochemical characteristics of this electrode are measured by Tafel plot and polarization curves in acidic solution, and for the application as real electrode in industrial electrolysis, stability of electrode in ZnSO₄ solution by using the long time was investigated. Mixed oxide electrode containing SnO₂ of 20 ㏖% exhibited oxygen evolution overpotential much lower than that on previous RuO₂ film electrodes. Also the addition to SnO₂increased the stability.
이환호(Hwan Ho Lee),윤경석(Kyoung Seok Yoon) 한국국제통상학회 2001 국제통상연구 Vol.6 No.2
This paper is to analyze whether or not the 1997`s currency crisis in Korea has made the structural change of our central bank`s foreign exchange market intervention. The sterilized foreign exchange market intervention model is set up by using reaction function of our central bank`s net domestic asset and is estimated by CORC estimation method and Chow test. The estimation result shows that our central bank has performed more strong sterilized foreign exchange market intervention after the 1997`s currency crisis. It seems to be that changes in a series policies by IMF requests, for example tight monetary policy, increase in foreign exchange holdings, openness of capital market, results in the scale of overall balance payment and the composition between current account and capital account, and the movement into flexible exchange rate system has increased the volatility of Won-Dollar exchange rate. Our central bank has intervened the foreign exchange market in order to reduce the sharp appreciation of the Korean Won and has sterilized it by selling monetary stabilization bonds for the purpose of mitigating inflation pressure at the same time. However, the excessive foreign exchange market intervention may result in the rigidity of monetary policy by the accumulation of monetary stabilization bonds and the increase in its interest payments, etc, and sacrifice strong points of the flexible exchange rate system. Therefore, it seems to be desirable that i) the foreign exchange market intervention has to be performed through open market operation by activating government bond market, ii) our central bank is to minimize the change of the foreign exchange reserve by controlling interest rate or money supply, and iii) the foreign exchange market intervention has to be restricted to the case of sharp movement of Won-Dollar exchange which departs from optimal exchange rate.