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Minjeong Lee(Minjeong Lee),Hyojung Bae(Hyojung Bae),Hokyun Rho(Hokyun Rho),Vishal Burungale(Vishal Burungale ),Pratik Mane(Pratik Mane ),Chaewon Seong(Chaewon Seong),Jun-Seok Ha(Jun-Seok Ha) 한국마이크로전자및패키징학회 2020 마이크로전자 및 패키징학회지 Vol.27 No.4
The Cu/Cu2O/CuO photoelectrode has been successfully fabricated by Rapid Thermal Annealing technique. The structural characterization of fabricated photoelectrode was performed using X-Ray diffraction, while elemental composition of the prepared material has been checked with X-Ray Photoelectron Spectroscopy. The synthesis parameters are optimized on the basis of photoelectrochemical performance. The best photoelectrochemical performance has been observed for the Cu/Cu2O/CuO photoelectrode fabricated at 550 ℃ oxidation temperature and oxidation time of 50 seconds with highest photocurrent density of -3 mA/㎠ at -0.13 V vs. RHE.
[PE-0032] QTL mapping for tiller number with Korean japonica rice varieties
Dong Kyung Yoon(Dong Kyung Yoon),Chaewon Lee(Chaewon Lee),Yunji Shin(Yunji Shin),Hyoja Oh(Hyoja Oh),Inchan Choi(Inchan Choi),Gang-Seob Lee(Gang-Seob Lee),Song Lim Kim(Song Lim Kim),Jeongho Baek(Jeongh 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Electrode Conditions of Lithium-Ion Cell for Achieving High Energy Density
Lee Chaewon,An Minju,Kim Eunchae,An Hyosang,Park Joohyuk,조창신,손영욱 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1
Lithium-ion batteries (LIBs) have become integral to various aspects of the modern world and serve as the leading technology for the electrifi cation of mobile devices, transportation systems, and grid energy storage. This success can be attributed to ongoing improvements in LIB performance resulting from collaborative eff orts between academia and industry over the past several decades. However, existing methods for calculating the energy density at the electrode level remain ambiguous and complex, complicating the comparison of energy density metrics across scientifi c reports. From this perspective, we highlight several testing parameters that are frequently overlooked in the academic literature but are critical for the practical applicability of LIBs. We discuss the metrics that infl uence the energy density, including the (i) loading level, (ii) electrode density, and (iii) N/P ratio, as well as the relationship between each parameter. Additionally, we consider the eff ect of the gravimetric capacity increase on the energy density. We hope that this report will serve as a guide for key battery design parameters at the electrode level and for deriving optimal electrode conditions in future LIB research.
Synthesis of electro-catalysts Fe–N/C and core–shell structured Fe@SiO2 using e-beam irradiation
Lee Chaewon,Uhm Young Rang,Choi-Yim Haein,Park Ji Hyun,Ha Taesung 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.4
In this work, the Fe–N/C catalyst and core–shell Fe@SiO2 nanoparticle was synthesized using electron beam (e-beam) irradiation to improve the oxygen reduction reaction activity in the polymer electrolyte membrane fuel cells. The Fe–Nx and Fe cores were synthesized at 80 kGy, and the SiO2 shell was manufactured at 40 kGy using e-beam irradiation. The coordination between Fe and 1,10-phenanthroline was efectively controlled by the molecular structure of bidentate. The material properties of the Fe–N/C catalysts were investigated using transmission electron microscopy (TEM), Inductively coupled plasma mass spectroscopy (ICP-MS), X-ray difraction (XRD), and X-ray photoelectron spectroscopy (XPS). The pyridinic N % was found to be 63.7% and 66.7% for Fe–N/C and 57Fe–N/C catalysts. Furthermore, the electrochemical properties of the Fe–N/C catalysts were investigated by Linear Sweep Voltammetry (LSV) and cyclic voltammetry (CV). The Fe–N/C catalyst showed higher activity at half-cells in 0.1 M HClO4 solution than the Fe–N/C catalyst synthesized by ultrasonic irradiation. The shell formation of SiO2, which prevents Fe oxidation, was confrmed by EDS mapping in Fe@SiO2.