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RISS 인기검색어
- 검색키워드
- 저자 : Bonita Dilasari (검색결과 6 건)
- 무료
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Dilasari, Bonita,Park, Jesik,Kusumah, Priyandi,Kwon, Kyungjung,Lee, Churl Kyoung The Korean Electrochemical Society 2014 한국전기화학회지 Vol.17 No.1
The corrosion behavior of stainless steel 304 (SS 304), titanium, nickel and aluminium is studied by immersion and anodic polarization tests in non-aqueous electrolytes. Tetraethyl ammonium tetrafluoroborate is used as a supporting electrolyte in the three kinds of solvents. The immersion test shows that chemical corrosion rate in propylene carbonate-based electrolyte is lower than those in acetonitrile- or ${\gamma}$-butyrolactone-based electrolytes. Surface analyses do not reveal any corrosion product formed after the immersion test. In the anodic polarization tests, a higher concentration of supporting electrolyte gives a higher current density. In addition, a higher temperature increases the current density in the active region and reduces the potential range in the passive region. SS 304 shows the highest corrosion potential while Al shows the lowest corrosion potential and the highest current density in all studied conditions. Based on the conducted corrosion tests, the corrosion resistance of metal substrates in the organic solvents can be sorted in descending order as follows: SS 304 - Ti - Ni - Al.
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Dilasari, Bonita,Kwon, Kyung-Jung,Lee, Churl-Kyoung,Kim, Han-Su The Korean Electrochemical Society 2012 한국전기화학회지 Vol.15 No.3
Ionic liquids are steadily attracting interests throughout a recent decade and their application is expanding into various fields including electrochemistry due to their unique properties such as non-volatility, inflammability, low toxicity, good ionic conductivity, wide electrochemical potential window and so on. These features make ionic liquids become an alternative solution for electrodeposition of metals that cannot be electroplated in aqueous electrolytes. In this review, we classify investigated metals into three categories, which are light (Li, Mg), refractory (Ti, Ta) and noble (Pd, Pt, Au) metals, rather than covering the exhaustive list of metals and try to update the recent development in this area. In electrodeposition of light metals, granular fine Li particles were successfully obtained while the passivation of electrodeposited Mg layers is an obstacle to reversible deposition-dissolution process of Mg. In the case of refractory metals, the quality of Ta and Ti deposit particles was effectively improved with addition of LiF and pyrrole, respectively. In noble metal category, EMIM TFSA ionic liquid as an electrolyte for Au electrodeposition was proven to be effective and BMP TFSA ionic liquid developed a smooth Pd deposit. Pt nanoparticle production from ionic liquid droplet in aqueous solution can be cost-effective and display an excellent electrocatalytic activity.
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Bonita Dilasari,박제식,Priyandi Kusumah,권경중,이철경 한국전기화학회 2014 한국전기화학회지 Vol.17 No.1
The corrosion behavior of stainless steel 304 (SS 304), titanium, nickel and aluminiumis studied by immersion and anodic polarization tests in non-aqueous electrolytes. Tetraethylammonium tetrafluoroborate is used as a supporting electrolyte in the three kinds ofsolvents. The immersion test shows that chemical corrosion rate in propylene carbonate-basedelectrolyte is lower than those in acetonitrile- or γ-butyrolactone-based electrolytes. Surfaceanalyses do not reveal any corrosion product formed after the immersion test. In the anodicpolarization tests, a higher concentration of supporting electrolyte gives a higher current density. In addition, a higher temperature increases the current density in the active region and reducesthe potential range in the passive region. SS 304 shows the highest corrosion potential whileAl shows the lowest corrosion potential and the highest current density in all studied conditions. Based on the conducted corrosion tests, the corrosion resistance of metal substrates in theorganic solvents can be sorted in descending order as follows: SS 304 - Ti - Ni - Al.
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Bonita Dilasari,권경중,이철경,김한수 한국전기화학회 2012 한국전기화학회지 Vol.15 No.3
Ionic liquids are steadily attracting interests throughout a recent decade and their application is expanding into various fields including electrochemistry due to their unique properties such as non-volatility, inflammability, low toxicity, good ionic conductivity, wide electrochemical potential window and so on. These features make ionic liquids become an alternative solution for electrodeposition of metals that cannot be electroplated in aqueous electrolytes. In this review, we classify investigated metals into three categories, which are light (Li, Mg), refractory (Ti, Ta) and noble (Pd, Pt, Au) metals, rather than covering the exhaustive list of metals and try to update the recent development in this area. In electrodeposition of light metals, granular fine Li particles were successfully obtained while the passivation of electrodeposited Mg layers is an obstacle to reversible deposition-dissolution process of Mg. In the case of refractory metals, the quality of Ta and Ti deposit particles was effectively improved with addition of LiF and pyrrole, respectively. In noble metal category, EMIM TFSA ionic liquid as an electrolyte for Au electrodeposition was proven to be effective and BMP TFSA ionic liquid developed a smooth Pd deposit. Pt nanoparticle production from ionic liquid droplet in aqueous solution can be cost-effective and display an excellent electrocatalytic activity.
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Bonita Dilasari,정여진,권경중 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Ionic liquids are considered as a potential electrolyte for rechargeable zinc–air battery due to nonvolatility,high ionic conductivity, and so on. Electrochemical measurements are conducted to investigatethe redox behavior of zinc electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide([BMPyr] [NTf2]) ionic liquid and the effect of water in the ionic liquid is also studied. Cyclic voltammetryof zinc electrode in [BMPyr] [NTf2] shows a reversible redox peak, and the presence of water givessignificant effects particularly on the cathodic current of zinc electrode. Different surface reactionmechanism on zinc electrode depending on the presence of water in ionic liquid is suggested.
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Room Temperature Magnesium Electrorefining by Using Non-Aqueous Electrolyte
Jesik Park,Yeojin Jung,Priyandi Kusumah,Bonita Dilasari,Heesuk Ku,Hansu Kim,Kyungjung Kwon,Churl Kyoung Lee 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
The increasing usage of magnesium inevitably leads to a fast increase in magnesium scrap, and magnesium recycling appears extremely beneficial for cost reduction, preservation of natural resources and protection of the environment. Magnesium refining for the recovery of high purity magnesium from metal scrap alloy (AZ31B composed of magnesium, aluminum, zinc, manganese and copper) at room temperature is investigated with a non-aqueous electrolyte (tetrahydrofuran with ethyl magnesium bromide). A high purity (99.999%) of electrorefined magneisum with a smooth and dense surface is obtained after potentiostatic electrolysis with an applied voltage of 2 V. The selective dissolution of magnesium from magnesium alloy is possible by applying an adequate potential considering the tolerable impurity level in electrorefined magnesium and processing time. The purity estimation method suggested in this study can be useful in evaluating the maximum content of impurity elements.
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