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RISS 인기검색어
- 검색키워드
- 저자 : Baeck B. Choi (검색결과 5 건)
- 무료
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Choi, Baeck B.,Kim, Bethy,Chen, Yiqi,Jiang, Peng The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
he progressively improved sensing sensitivity (∆λ<sub>SPR</sub>/∆n, nm/RIU) to detect the refractive index is observed on the SPR platform of an Au-covered epoxy gratings in an increase in potential cycling in a typical three-electrode cell. Here, a DVD-R optical disc was used as a structure template to prepare an Au-covered epoxy gratings, and the newly formed reverse track pitch structure on the epoxy substrate was used as a working electrode directly in aqueous sulfuric acid solution. It is expected that Au reconstruction by potential cycling in sulfuric acid electrolyte increases the packing density of Au atoms in the grain boundary and improves the propagation of electromagnetic waves.
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Choi, Baeck B.,Jo, Jae Hyeon,Lee, Taehee,Jeon, Sang-Yun,Kim, Jungsuk,Yoo, Young-Sung The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3
Polymer electrolyte membrane (PEM) electrolyzer or alkaline electrolyzer is required to produce green hydrogen using renewable energy such as wind and/or solar power. PEM and alkaline electrolyzer differ in many ways, instantly basic materials, system configuration, and operation characteristics are different. Building an optimal water hydrolysis system by closely grasping the characteristics of each type of electrolyzer is of great help in building a safe hydrogen ecosystem as well as the efficiency of green hydrogen production. In this study, the basic operation characteristics of a kW class alkaline water electrolyzer we developed, and water electrolysis efficiency are described. Finally, a brief overview of the characteristics of PEM and alkaline electrolyzer for large-capacity green hydrogen production system will be outlined.
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Inverse DVD-R grating structured SPR sensor platform with high sensitivity and figure of merit
Baeck B. Choi,Bethy Kim,Jason Bice,Curtis Taylor,Peng Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
The figure of merit (FOM, 1/RIU) 112.34 is achieved in the Au-covered epoxy grating (Au/Epoxy) with theinverse structure of the original track pitch DVD-R. The feasible exfoliation of the cured epoxy resin fromthe Au-covered polycarbonate (PC) gratings (Au/PC) of DVD-R grating creates a narrow deep channelstructure. As well as Au/PC, newly created Au/Epoxy gratings glow beautifully with rainbow-coloredstripes on the surface due to the constructive interference of visible light. The SEM and 3D-AFM imagesshow that the surface distortion of the Au/Epoxy grating is 0.58 (negative) and that of the Au/PC gratingis 0.14 (positive). The Au/Epoxy grating exhibits 872.01 nm/RIU with slightly lower sensitivity than theAu/PC grating (887.59 nm/RIU). However, the Au/Epoxy grating shows a total of 7.76 ± 0.53 nm with up tofull width half maximum (FWHM) for the SPR dip during the detection test, so a high FOM of 112.34 canbe achieved. In addition, the FDTD simulation shows the experimental results as well as the relevantresults of the SPR deep wavelength and FWHM. Finally, the Au/Epoxy grating shows a more pronouncedresonance for methanol concentration measurements than the Au/PC grating due to the high FOM andstrong adhesion between the Au layer and the epoxy substrate.
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Baeck B. Choi,Bethy Kim,Yiqi Chen,유성종,조용현,Peng Jiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The colloidal Langmuir–Blodgett coating process is used to fabricate Au-covered silica sphere monolayer(Aufilm over silica nanosphere (AuFON)) and study the effects of silica diameter on surface plasmonresonance (SPR) sensing sensitivity. The resulting hexagonal close-packed (HCP) monolayers areprepared with silica sphere diameters of 200, 400, 700, and 1000 nm. In SPR sensing applications, theoptical properties of Au-covered silica sphere monolayer are evaluated by measuring normal-incidencereflection spectra and sensing tests. The high sensitivity (nm/RIU) is observed in silica sphere diameter(1000 > 700 > 400 > 200 nm) and plasmon mode (dipole > Fano resonance (FR) > and high order) whilethe highest sensitivity is 968 nm/RIU (dipole mode, 1000 nm of silica sphere diameter). 3-D FiniteDifference Time Domain (FDTD) simulation shows a sensitivity trend similar to the experimental results.
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Current progress of electrocatalysts for anion exchange membrane fuel cells
Park Subin,최대일,Dong Wook Lee,Choi Baeck B.,Yoo Sung Jong 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
The transition from a carbon-centered economy to an era of renewable energy has led to global attention on hydrogen energy, ultimately leading to the development of fuel cells using hydrogen as a fuel. In response to global demand, overall fuel cell technology has grown remarkably over the past few years; yet, commercialization remains sluggish owing to cost. As the cathode of a proton exchange membrane fuel cell (PEMFC), which is the most commercialized fuel cell, is markedly dependent on platinum (Pt), anion exchange membrane fuel cells (AEMFCs), which can utilize non-precious materials as cathode catalysts, have emerged as a promising alternative. Earth-abundant metals are used as cathode catalysts, and metal-free materials are used to achieve comparable performance to Pt. Compared to the single-cell performance of Pt catalysts, a gap still exists; however, the applicability of non-noble metals has been extensively evaluated. If catalyst development is accompanied by efficient electrode structure design, a significant part of the cost problem can be overcome. AEMFCs have advantages in the ORR of cathodes compared to PEMFCs; however, the HOR kinetics are quite sluggish. Therefore, the design of HOR catalysts requires another approach, not only to enhance their intrinsic activity, but also consider the poisoning induced by the use of ionomers besides PEMFCs. Therefore, a strategy based on the HOR pathway is required to lower the barrier of the rate-determining step. In this review, catalysts for AEMFCs were introduced based on their classification, and information on recent trends and issues related to catalysts was presented.
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