https://scholar.gist.ac.kr/handle/local/7940 2026-05-13T15:04:10Z 2026-05-13T15:04:10Z 김민곤 https://scholar.gist.ac.kr/handle/local/25623 2025-07-02T06:38:48Z 2009-06-22T15:00:00Z

Title: 환경모니터링을 위한 표면증강라만분광(SERS) 바이오센서 기술 Author(s): 김민곤

2009-06-22T15:00:00Z Kim, Hee Joo Kim, Ju-Hyeon Kim, Yong Ryun Lee, Kwang Hee https://scholar.gist.ac.kr/handle/local/21700 2025-07-02T03:41:59Z 2023-03-30T15:00:00Z

Title: 유기전해질을 Dual-side Passivation 층으로 도입한 고효율 고안정성 페로브스카이트 태양전지 Author(s): Kim, Hee Joo; Kim, Ju-Hyeon; Kim, Yong Ryun; Lee, Kwang Hee Abstract: Interface engineering at the interface between the perovskite layer and the charge transport layer (CTL), or CTL and metal electrodes, is critical for demonstrating the efficient and stable perovskite solar cells (PSCs). Herein, we demonstrate the efficient and stable PSCs by introducing the organic electrolytes (OEs) as a “dual-side passivation layer” in both p-i-n and n-i-p configuration of PSCs. Firstly, a newly synthesized bathocuproine (BCP)-based nonconjugated polyelectrolyte (poly-BCP) is introduced between the tin oxide (SnO2) CTL and the perovskite layer in the n-i-p configuration. Poly-BCP effectively passivate oxygen-vacancy defects of the SnO2 side and simultaneously scavenges ionic defects of perovskite side, suppressing both bulk and interfacial nonradiative recombination in PSCs. As a result, the modified PSCs exhibited a high power conversion efficiency (PCE) of 24.4% and a high open-circuit voltage of 1.21 V. Furthermore, the non-encapsulated PSCs show excellent long-term stability by retaining 93% of the initial PCE after 700 h under continuous 1-sun irradiation in nitrogen atmosphere conditions. Secondly, amine-functionalized small molecule electrolytes (SMEs) are introduced as passivation layer between the PCBM CTL and metal electrode (here, Cu) in the p-i-n configuration. A strong coordination bond of Cu─N forms at the Cu/SMEs interface, leading to the layer–layer growth mode for the dense formation of Cu electrodes with a strong adhesion to the CTL. Thus, this modified electrode prevents the ingress of moisture into the PSCs, resulting in outstanding moisture stability; the efficiency of non-encapsulated PSCs retains 90% of the initial PCE after 200 days of exposure to atmospheric air (25 ℃, relative humidity [RH] ~20–40%). Under harsher conditions (e.g., 25 ℃/RH65%, 25 ℃/RH85% and immersion in water) for a considerable time period, the modified PSCs manifest relatively no degradation compared with the pristine PSCs.

2023-03-30T15:00:00Z 이지연 박찬호 https://scholar.gist.ac.kr/handle/local/23069 2025-07-02T04:19:16Z 2019-04-03T15:00:00Z

Title: 온도와 전구체 조건에 따라서 달라지는 흑연화 정도에 의한 비귀금속계 촉매의 알칼리 조건에서의 산소환원반응의 활성 Author(s): 이지연; 박찬호 Abstract: Over the decades, various catalysts have been investigated to replace the state-of-the-art Pt catalyst for oxygen reduction reaction (ORR), because the cost of Pt catalysts accounts for more than 50% of a fuel cell stack cost when the fuel cell electric vehicles are produced for 500,000 units per year. Thus, economic catalysts such as Fe-N/C as non-precious metal catalyst are the final goal of catalyst research and development. In this study, we use several temperature conditions, such as 1000°C, 900°C and 800°C with 1:2 and 1:4 of iron and nitrogen atomic ratios in the precursor solution to investigate the dominant effects towards ORR activity in alkaline condition. At temperatures above 900°C, a sharp peak is observed at 26° position in the wide-angle XRD pattern, which means graphitic order increase because the position is general graphite carbon peak for (002) plane. Using Mering-Merire index, we find that 1:2 atomic ratios shows better graphitic order than 1:4 atomic ratios. Also, the products appear better ORR activity. Thus, the products are analyzed by X-ray photoelectron spectroscopy(XPS), N2 sorption, X-ray diffraction (XRD) and electrochemical technics to investigate the reasons.

2019-04-03T15:00:00Z 백채경 이승우 박찬호 https://scholar.gist.ac.kr/handle/local/22853 2025-07-02T04:14:36Z 2019-11-07T15:00:00Z

Title: 양성자교환막 수전해을 위한 다공성 금속 산화물 산소발생 촉매의 조사 Author(s): 백채경; 이승우; 박찬호 Abstract: Recently, proton exchange membrane water electrolysis (PEMWE) has been attracting an attention as an energy storage using renewable electricity due to the high current operation and excellent load-following characteristics compared to the alkaline water electrolysis. Among the electrocatalytic reactions of the PEMWE, the oxygen evolution reaction (OER) at the anode has a significantly high overpotential because of the intrinsic multiple electron transfer. Thus, the catalysts for OER has been widely developed for several decades to improve the total efficiency of PEMWE. In this presentation, nanoporous RuOx-based catalysts were synthesized by various methods such as adams method, nano-template method using the ordered mesoporous silica material as a template and polymer macroparticles. The porous OER catalysts with a very high surface area over than 50 m2/g, which is changed significantly by the synthesis method, were obtained. The electrochemical surface area of the nanoporous catalysts are estimated by double layer capacitance method, which also depends on the preparation methods. RuO2 synthesized by nano-template method showed the lowest overpotential of 266 mV at 10 mA/cm2 compared to other nanoporous RuO2 synthesized by modified adams fusion methods. It will be discussed the relationship between activity toward OER and physical and electrochemical properties of the nanoporous metal oxide catalyst

2019-11-07T15:00:00Z