https://scholar.dgist.ac.kr/handle/20.500.11750/10136 2026-06-11T21:05:54Z https://scholar.dgist.ac.kr/handle/20.500.11750/60412 Title: Quantitative Analysis of Ionic Channel Network Variation in Nafion Under Continuous Annealing Using Current-Sensing Atomic Force Microscopy Author(s): Kwon, Osung; Son, Byungrak Abstract: Proton exchange membranes (PEMs) are essential for PEM fuel cells, with proton conductivity arising from the hydration-induced ionic channel network. PEM performance can be enhanced through pretreatments, such as annealing, which reconstruct the ionic channels. This study investigates the ionic channel network variation in Nafion 212 under continuous annealing at 90 degrees C using current-sensing atomic force microscopy (CSAFM). A nanoscale PEM fuel cell was formed with a Pt-coated CSAFM tip and Pt-coated Nafion surface. Topography and surface roughness analyses revealed geometrical changes from annealing. Current-sensing images and histograms qualitatively assessed local conductance and ionic channel distribution. The ionic channel network density was quantitatively evaluated using the number of protons moving through the ionic channel network (NPMI), derived from CSAFM and electrodynamics principles. NPMI directly reflects ionic channel density. From the unannealed state to 60 h, NPMI increased linearly at 1 & times; 104 h-1, indicating enhanced channel formation. Beyond 60 h, NPMI decreased linearly at 1.9 & times; 105 h-1, reflecting progressive network degradation. As the ionic channel network increases, the number of protons reaching the membrane surface also increases, whereas in the opposite case it decreases. Thus, NPMI becomes evaluation criterion for ionic channel network density. These findings systematically link nanoscale structural changes to ionic channel reconstruction and proton transport in Nafion 212, providing insight into PEM performance evolution under thermal treatment. 2026-04-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60371 Title: 무기태양전지 및 이의 제조방법 Author(s): 우성호; 김강필 Abstract: 본 발명은 금속 나노입자를 포함한 정공차단층과 나노 패턴이 형성된 전자전달층을 포함하는 무기태양전지 및 이의 제조방법에 대한 것이다. 본 발명의 실시예에 따른 무기태양전지는 나노 패턴이 형성된 전자전달층에 의해 입사광의 회절이 유도되어 더 많은 광의 흡수가 가능케 하며, 정공차단층에 포함된 금속 나노입자에 의한 플라즈몬 효과로 광의 증폭 효과가 유발되어 더 많은 광전자가 여기되고 소자효율이 향상될 수 있다. https://scholar.dgist.ac.kr/handle/20.500.11750/60363 Title: Fluorinated ether-anchored solid polymer electrolyte for lithium metal batteries for low-temperature adaptability Author(s): Lee, Yuri; Jeon, Injun; Kim Ji Hoon; Kim Jongmin; Lee Sang Uck; Chun Sang-Eun; Kim Jae Hyun Abstract: Solid polymer electrolytes (SPEs) are promising for safe and scalable all-solid-state lithium batteries, but lowtemperature ionic transport and interfacial instability limit their practical use. Here, we present a fluorinatedether (FE)-anchored polymer electrolyte (FAPE) based on a PEGDME semi-interpenetrating network, designed to overcome these challenges. FE units anchor onto ether chains via C- H & sdot;& sdot;& sdot;O interaction, suppressing crystallization, weakening Li*-EO coordination, and promoting formation of inorganic-rich, anion-derived interphases. FAPE exhibits high ionic conductivity down to -20 degrees C, intrinsic nonflammability, and an expanded electrochemical stability window. Lithium metal cells with FAPE demonstrate enhanced Coulombic efficiency, extended cycling stability, and higher critical current densities compared to conventional PEGDME-based SPEs. Full cells and prototype pouch cells retain high capacities under both ambient and sub-zero temperatures, highlighting their practical applicability. This molecular anchoring strategy provides a versatile platform to tailor solvation structure and interphase chemistry, enabling wide-temperature, safe, and durable operation in high-energy solidstate lithium metal batteries. 2026-04-30T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/60334 Title: 삼중접합 탄뎀형 태양전지 및 이의 제조방법 Author(s): 김대환; 강진규; 성시준