http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
송은호,조상혁,최교훈,박정태 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Dye-sensitized solar cells (DSSCs) have attracted attention due to eco-friendliness, economical advantages, and facile fabrication. However, liquid state electrolytes for most conventional DSSCs have weakness due to leakage and safety problem. Many researchers approached to surmount these disadvantages by superseding liquid electrolytes with gel electrolytes. But gel polymer electrolytes have low performance. To overcome these hinderances, we applied additives to gel electrolyte. Gel polymer electrolytes with a cobalt based Zeolite imidazolate framework (ZIF-67) nanofillers were used as electrolyte additives in DSSCs. Characterization of ZIF-67 electrolytes absorbance using UV-vis has resulted in higher value. Nanofillers disturb the recombination between oxidized redox couple and electrons in TiO<sub>2</sub> inducing increment of V<sub>oc</sub> value. With ZIF-67 additives, DSSC showed higher V<sub>oc</sub>, fill factor (FF) and better power conversion efficiency (η) in I-/I<sub>3</sub> <sup>-</sup> redox couple under illuminated AM 1.5.
500 MS/s 4-Bit Flash ADC with Complementary Architecture
이현엽,송은호,어윤성,조춘식,김영진 한국전자파학회 2024 Journal of Electromagnetic Engineering and Science Vol.24 No.1
This paper proposes a 500 MS/s 4-bit flash analog-to-digital converter (ADC) featuring a differential input voltage range of 1.2 V<sub>pp</sub> operating at a supply voltage of 1.2 V. Although the proposed circuit utilizes a conventional flash ADC structure, its track and hold circuit, driving buffer, and preamp circuits corresponding to the analog stages are designed using complementary architecture to attain a sufficient swing range even at a low supply voltage. Notably, the proposed structure satisfies the error requirements. The error source of the flash ADC, such as the comparator’s input referred offset, did not degrade its performance, while the use of a calibration circuit, characterized by power consumption and area burdens and increased complexity, could also be avoided. Therefore, the proposed flash ADC met the error requirements, such as the comparator’s input referred offset, without the need for calibration circuits. The chip, fabricated using the TSMC 65 nm process, covers an area of 1,160 × 950 μm<sup>2</sup> and consumes 78 mW of power. Furthermore, its signal-to-noise and distortion ratio and spurious-free dynamic range were measured to be 23.36 dB and 30.26 dB, respectively, at a sampling frequency of 500 MHz.
The ternary-double comb copolymer electrolyte for using flexible electric double layer capacitor
문주용,송은호,임정민,박정태 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The aqueous electrolytes are mainly used as electrolytes for supercapacitors, but there are disadvantages such as limited range of potential windows and electrolyte leakage problem. Therefore, many researchers are being held to develop electrolytes using polymers using nonaqueous electrolytes. The PVDC-g-(PMMA-g-POEM) was synthesized by ATRP and was used for supercapacitor polymer electrolyte with bis(trifluoromethane) sulfonamide lithium (LiTFSI) salt for enhancing ionic conductivity. PVDC-g-PMMA is the hydrophobic backbone which gives mechanical property that decreases crystallinity with grafting PMMA to PVDC and POEM possesses the hydrophilic side chain, making electron pathway which raises the electron transport properties. The coin cell structure with two stainless steel was used to measure ionic conductivity. Furthermore, solid-state flexible devices using carbon-based electrode are fabricated and assembled symmetrically using as-synthesized polymers as electrolyte.
이재연,임승만,송은호,박정태 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Metal oxides are incorporated as nanofillers (NFs) in the polymer electrolytes to reduce the polymer crystallinity and enhance ion conductivity. In this study, we prepare two types of Co<sub>3</sub>O<sub>4</sub> to serve as NF in polyvinyl alcohol electrolytes. One-dimensional Co<sub>3</sub>O<sub>4</sub> (1-DCO) is synthesized by chemical bath deposition and via oxidation of ZIF-67, polyhedral Co<sub>3</sub>O<sub>4</sub> (PCO) is prepared . The conductivity is measured by using 1-DCO and PCO as additives in PVA/KOH electrolyte. The optimized mass percentage was 7 wt% determined by ionic conductivity measurements using two steel blocking electrodes. Furthermore, the electrochemical properties of two electrode supercapacitors were evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. As a result, the gel electrolyte containing one-dimensional Co<sub>3</sub>O<sub>4</sub> filler was considered more suitable for supercapacitor due to provide long electron pathway and ion transfer tunnels.