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Jeong Woo Shin,Sungje Lee,Dohyun Go,Byung Chan Yang,Taeyoung Kim,Sung Eun Jo,Pei-Chen Su,Jihwan An 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.3
Designing highly active and thermally stable electrodes is crucial for realizing low-temperature solid oxide fuel cells (LT-SOFCs) with excellent performance. In this study, we fabricated an yttria-doped ceria (YDC) shell layer by atomic layer deposition (ALD) over a Pt cathode by controlling the doping concentration of yttria in YDC film. The exchange current density was enhanced by a factor of five when the ALD YDC shell layer was deposited onto the cathode surface compared to the bare Pt cathode, resulting in an 80% decrease in the activation resistance of the 19 mol%-doped ALD YDC-overcoated Pt cathode compared to that of the bare Pt cathode. Furthermore, the thermal stability was enhanced in low-to-medium-doped (7–19 mol%) ALD YDC-coated Pt cathodes, whereas the highly doped (31 mol%) cathode showed a relatively marginal improvement in stability.
High Temperature and non-volatile Li-ion battery based on Garnet Solid electrolyte
남찬우,이윤성 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The Oxide-based solid-state battery restricts by the high interfacial resistance between the cathode/electrolyte interface. Herein, we propose a sintering aid to enhance the interfacial connection between the cathode and solid electrolyte. Our prepared Solid-state Battery delivering an initial discharge capacity of 66 mAh/g (80 ℃) at 0.1 C rate based on the LCO composite cathode. After the 1st cycle, the capacity was decreased due to the space charge layer formation in the interface. The interfacial modification reducing the interfacial resistance but not in the decomposition of particles. This work suggests an additional interface treatment in the cathode particles benefits to enhance the electrochemical performance of the ASSLIB.
Ambade, Rohan B,Ambade, Swapnil B,Mane, Rajaram S,Lee, Soo-Hyoung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.15
<P>The role of cathode buffer layer (CBL) is crucial in determining the power conversion efficiency (PCE) of inverted organic solar cells (IOSCs). The hallmarks of a promising CBL include high transparency, ideal energy levels, and tendency to offer good interfacial contact with the organic bulk-heterojunction (BHJ) layers. Zinc oxide (ZnO), with its ability to form numerous morphologies in juxtaposition to its excellent electron affinity, solution processability, and good transparency is an ideal CBL material for IOSCs. Technically, when CBL is sandwiched between the BHJ active layer and the indium-tin-oxide (ITO) cathode, it performs two functions, namely, electron collection from the photoactive layer that is effectively carried out by morphologies like nanoparticles or nanoridges obtained by ZnO sol-gel (ZnO SG) method through an accumulation of individual nanoparticles and, second, transport of collected electrons toward the cathode, which is more effectively manifested by one-dimensional (1D) nanostructures like ZnO nanorods (ZnO NRs). This work presents the use of bilayered ZnO CBL in IOSCs of poly(3-hexylthiophene) (P3HT)/[6, 6]-phenyl-C60-butyric acid methyl ester (PCBM) to overcome the limitations offered by a conventionally used single layer CBL. We found that the PCE of IOSCs with an appropriate bilayer CBL comprising of ZnO NRs/ZnO SG is 18.21% higher than those containing ZnO SG/ZnO NRs. We believe that, in bilayer ZnO NRs/ZnO SG, ZnO SG collects electrons effectively from photoactive layer while ZnO NRs transport them further to ITO resulting significant increase in the photocurrent to achieve highest PCE of 3.70%. The enhancement in performance was obtained through improved interfacial engineering, enhanced electrical properties, and reduced surface/bulk defects in bilayer ZnO NRs/ZnO SG. This study demonstrates that the novel bilayer ZnO CBL approach of electron collection/transport would overcome crucial interfacial recombination issues and contribute in enhancing PCE of IOSCs.</P>
Electrode design and material engineering for high energy sulfide-solid state batteries
오필건,김창우,손윤국 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Sulfide all-solid-state lithium batteries (ASSLBs) have received great attention as substitutes for conventional lithium-ion batteries (LIBs) owing to their safety, wide operating temperature range, and feasible battery package design. However, the disparity in energy and power density between the current sulfide ASSLBs and conventional LIBs is still wide, owing to a lack of understanding of the battery electrode system. Herein, in order to understand the current status of sulfide-ASSLBs development and determine the future research direction, we will compare the present sulfide-ASSLBs with the conventional LIBs’ technologies. Furthermore, to solve present drawbacks, we will propose an innovative research direction with its limitations in recent research, suggesting new insights in this rapidly developing the sulfide all-solid-state lithium batteries.
이단 마이크로 플라즈마 추력기의 개념 설계에 대한 실험적 연구
호 티 탄 트랑(Ho Thi Thanh Trang),신지철(Jichul Shin) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
이단 마이크로 플라즈마 추력기 (μPT)의 개념 설계를 위하여 실험적 연구가 수행되었다. 운전 조건 및 노즐의 설계조건에 따른 전극 간격 및 출구 면적의 변화에 대한 추력기의 성능 최적화 연구가 수행되었다. 운전 압력은 10<SUP>-1</SUP> Torr에서 10<SUP>-4</SUP> Torr의 진공 조건이며 아르곤 가스의 유량은 5 sccm에서 300 sccm에 대하여 추력기의 성능 검증 연구가 이루어 졌다. 소모전력 약 1 watt에서 5 watt의 운전상태에서 약 3000에서 4000정도의 비추력이 예상된다. 마이크로 플라즈마 추력기에 의해 발생된 토출 제트의 사진 및 전기적 특성에 대한 결과를 포함하였다. This work is devoted to an experimental investigation on conceptual design of dual consecutive stage micro plasma thruster (μPT). Optimization study on the thruster configuration has been performed for various electrode gap distances from 1 mm to 2 mm and the hole diameter from 0.3 mm to 2 mm depending on desired operating conditions and corresponding nozzle design requirement. The operation of μ PT at low pressure from 10<SUP>-1</SUP> Torr to 10<SUP>-4</SUP> Torr and at various argon flow rates ranging from 5 sccm to 300 sccm has been studied to understand the physic of plasma and the gas dynamics in details. The specific impulse can reach up to 3000-4000 seconds at low power consumptions from 1 to 5 W. Image of exhaust plume from μ PT will be provided and electrical characteristics is also mentioned in this paper.
황화물계 전고체 리튬이온전지의 연구 동향과 앞으로의 연구 방향
오필건,손윤국,김창우 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Sulfide all-solid-state lithium batteries (ASSLBs) have received great attention as substitutes for conventional lithium-ion batteries (LIBs) owing to their safety, wide operating temperature range, and feasible battery package design. However, the disparity in energy and power density between the current sulfide ASSLBs and conventional LIBs is still wide, owing to a lack of understanding of the battery electrode system. Herein, in order to understand the current status of sulfide- ASSLBs development and determine the future research direction, we will compare the present sulfide-ASSLBs with the conventional LIBs’ technologies. Furthermore, to solve present drawbacks, we will propose an innovative research direction with its limitations in recent research, suggesting new insights in this rapidly developing the sulfide all-solid-state lithium batteries.
Development of Dual Stage Micro Plasma Thruster
Ho Thi Thanh Trang(호티탄트랑),Jichul Shin(신지철) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
이단 마이크로 플라즈마 추력기 (μPT)의 개념 설계를 위하여 실험적 연구가 수행되었다. 운전 조건 및 노즐의 설계조건에 따른 전극 간격 및 출구 면적의 변화에 대한 추력기의 성능 최적화 연구가 수행되었다. 운전 압력은 10<SUP>-1</SUP> Torr에서 10<SUP>-4</SUP> Torr의 진공 조건이며 아르곤 가스의 유량은 5 sccm에서 300 sccm에 대하여 추력기의 성능 검증 연구가 이루어 졌다. 소모전력 약 1 watt에서 5 watt의 운전 상태에서 약 3000에서 4000정도의 비추력이 예상된다. 마이크로 플라즈마 추력기에 의해 발생된 토출 제트의 사진 및 전기적 특성에 대한 결과를 포함하였다. This work is devoted to an experimental investigation on conceptual design of dual consecutive stage micro plasma thruster (μPT). Optimization study on the thruster configuration has been performed for various electrode gap distances from 1 mm to 2 mm and the hole diameter from 0.3 mm to 2 mm depending on desired operating conditions and corresponding nozzle design requirement. The operation of μPT at low pressure from 10<SUP>-1</SUP> Torr to 10<SUP>-4</SUP> Torr and at various argon flow rates ranging from 5 sccm to 300 sccm has been studied to understand the physic of plasma and the gas dynamics in details. The specific impulse can reach up to 3000-4000 seconds at low power consumptions from 1 to 5 W. Image of exhaust plume from μPT will be provided and electrical characteristics is also mentioned in this paper.