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Synthesis and characterization of CIS nanoparticle ink for low-cost thin film solar cells.
Shim, Joongpyo,Hahn, Jae-Sub,Lee, Soo-Ho,Lee, Jaehyeong American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.12
<P>CuSe and CuInSe2 nanoparticles were synthesized through the aqueous solution process using NaBH4 solution as a solvent and subsequent heat-treatment. Not only the synthesized nanoparticles, CuSe and CuInSe2, but also spray-coated thin films prepared by using CuSe and CuInSe2 were characterized by XRD, SEM-EDS, TGA and UV-Vis spectroscopy. CuSe nanoparticles with a plate-like shape, which were confirmed by XRD and SEM, were directly prepared by a reaction of a mixture of CuCl2 and Se in the aqueous solution of NaBH4 at room temperature. Cu-In-Se compounds were obtained through the reaction of CuCl2, InCl3, and Se in the aqueous solution of NaBH4, were consisted of the mixture of CuSe(x) and In hydroxides, and were transformed into CuInSe2 with a chalcopyrite structure by a heat-treatment at 300 degrees C.</P>
Lee, Jae-Young,Shim, Joongpyo,Hong, Sung-Wan,Han, Kyeongsik,Lee, Woo-Kum,Lee, Hong-Ki American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>A simple method for the synthesis of Pt-Pd nanocatalysts was developed for a proton-exchange membrane fuel cell (PEMFC), which was loaded on a nafion coated carbon black via the sequential reduction of palladium(II) bis(acetylacetonato) and platinum(II) bis(acetylacetonato) in a drying process. Metallic precursors were sublimed and reduced on a nafion coated carbon black which was spray coated on a gas diffusion layer (GDL) in a glass reactor of N2 atmosphere at 180 degrees C for various times. The morphology and distribution of the Pt and Pd nanoparticles were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and we found that the loading weight, number density and particle size of Pt-Pd nanoparticles increased with increasing exposure time at 180 degrees C.</P>
Lee, Jaeho,Won, Sora,Shim, Joongpyo,Park, Gyungse,Sun, Ho-Jung,Lee, Hong-Ki The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.4
Si-carbon composites as anode materials for lithium rechargeable batteries were prepared simply by mixing Si nanoparticles with carbon black and/or graphite through a solution process. Si nanoparticles were well dispersed and deposited on the surface of the carbon in a tetrahydrofuran solution. Si-carbon composites showed more than 700 mAh/g of initial capacity under less than 20% loading of Si nanoparticle in the composites. While the electrode with only Si nanoparticles showed fast capacity fading during continuous cycling, Si-carbon composite electrodes showed higher capacities. The cycle performances of Si nanoparticles in composites containing graphite were improved due to the role of the graphite as a matrix.
Synthesis of CZTS Nanoparticles for Low-Cost Solar Cells
Kim, Donguk,Kim, Minha,Shim, Joongpyo,Kim, Doyoung,Choi, Wonseok,Park, Yong Seob,Choi, Youngkwan,Lee, Jaehyeong American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>In this work, uniformly sized Cu2ZnSnS4 (CZTS) nanoparticles with easy control of chemical composition were synthesized and printable ink containing CZTS nanoparticles was prepared for low-cost solar cell applications. In addition, we studied the effects of synthesis conditions, such as reaction temperature and time, on properties of the CZTS nanoparticles. For CZTS nanoparticles synthesis process, the reactants were mixed as the 2:1:1:4 molar ratios. The reaction temperature and time was varied from 220 degrees C to 320 degrees C and from 3 hours to 5 hours, respectively. The crystal structure and morphology of CZTS nanoparticles prepared under the various conditions were investigated by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), and energy dispersive X-ray spectroscopy (EDS) was used for compositional analysis of the CZTS nanoparticles.</P>
RF 스퍼터법을 이용한 Li<sub>2</sub>MnSiO<sub>4</sub> 리튬 이차전지 양극활물질 박막 제조 및 전기화학적 특성
채수만,심중표,선호정,Chae, Suman,Shim, Joongpyo,Sun, Ho-Jung 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.7
In this study, $Li_2MnSiO_4$ cathode material and LiPON solid electrolyte were manufactured into thin films, and the possibility of their use in thin-film batteries was researched. When the RTP treatment was performed after $Li_2MnSiO_4$ cathode thin-film deposition on the SUS substrate by a sputtering method, a ${\beta}-Li_2MnSiO_4$ cathode thin film was successfully manufactured. The LiPON solid electrolyte was prepared by a reactive sputtering method using a $Li_3PO_4$ target and $N_2$ gas, and a homogeneous and flat thin film was deposited on a $Li_2MnSiO_4$ cathode thin film. In order to evaluate the electrochemical properties of the $Li_2MnSiO_4$ cathode thin films, coin cells using only a liquid electrolyte were prepared and the charge/discharge test was conducted. As a result, the amorphous thin film of RTP treated at $600^{\circ}C$ showed the highest initial discharge capacity of about $60{\mu}Ah/cm^2$. In cases of coin cells using liquid/solid double electrolyte, the discharge capacities of the $Li_2MnSiO_4$ cathode thin films were comparable to those without solid LiPON electrolyte. It was revealed that $Li_2MnSiO_4$ cathode thin films with LiPON solid electrolyte were applicable in thin film batteries.
Ahmed Sheraz,Rim Hyung‐Ryul,Sun Ho‐Jung,Lee Hong‐Ki,Shim Joongpyo,Park Gyungse 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.5
The application of heteroatom doped cobalt (Ni@Co/C) prepared from a porous metal–organic framework as the cathode material for the rechargeable zinc–air batteries has been demonstrated. The Ni@Co/C-modified electrode showed an excellent catalytic activity toward oxidation–reduction reaction and oxygen evolution reactions. The Co/C catalysts, which were Co particle impregnated on graphitic carbon powders, were synthesized after the calcination of Co3 (SDA)3(DMF)2 precursor, and then Ni deposition (Ni@Co/C) was followed on it by chemical reduction. Linear sweep voltammetry measurement indicates that Ni@Co/C-H800, which had Ni particles on Co/C derived from MOF at 800 C under N2, exhibited excellent performance. The stable charging/discharging profiles at 20 mA cm2 of current were obtained for the 350 h in alkaline medium, suggesting Ni@Co/C-H800 as a potential candidate for oxidation– reduction and evolution reactions.