https://scholar.gist.ac.kr/handle/local/7939 2026-05-13T14:56:45Z https://scholar.gist.ac.kr/handle/local/15055 Title: 특집 : 기능성 펩토이드의 합성과 응용 Author(s): 남호연; 서지원 2014-07-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/13207 Title: 이트륨 함량에 따른 Pd-Ir-Y 3원계 합금 촉매 입자의 특성과 산소 환원반응의 활성 비교 Author(s): 김도형; 이은애; 박찬호 Abstract: To enhance catalyst activity of the palladium (Pd) towards oxygen reduction reaction (ORR), iridium (Ir) and yttrium (Y) were alloyed by polyol method. Due to the low reduction potential of Y, it is hard to reduce Y ion completely by polyol method. In XPS spectra, the binding energy of the Pd is shifted to a lower value, which indicates the d-electron of Pd is filled by the electron from the Y. And other phases of Y are observed by the XPS. Among the catalysts, the Pd4IrY0.1/C showed the best activity towards ORR, which indicates the metallic Y is effective for improving the catalytic activity. Thus, for further enhancing ORR activity, the novel method for complete reduction of Y is needed. 2018-06-30T15:00:00Z https://scholar.gist.ac.kr/handle/local/12129 Title: 알코올계 촉매 슬러리를 활용한 바 코팅으로 제조된 PTFE 전극의 형성 및 특성 조사 Author(s): 정현승; 김도형; 박찬호 Abstract: Alcohol-based solvents including ethanol (EtOH) and tert-butyl alcohol (TBA) are investigated instead of isopropanol (IPA), which is a common solvent for polytetrafluoroethylene (PTFE), as an alternative solvent for preparing the catalyst slurry with PTFE binder. As a result, the performance at 0.2 A/cm2 from the single cells from using catalyst slurries based on EtOH and TBA showed very similar value to that from the slurry using IPA, which implies the EtOH and TBA can be used as a solvent for the catalyst slurry. It is also confirmed by the very close values of the total resistance of the membrane electrode assemblies from the slurries using different solvents. In the energy dispersive spectrometry (EDS) image, the shape of crack and dispersion of PTFE are changed according to the vapor pressure of the solvent. 2020-05-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/10994 Title: 고온 고분자 전해질막 연료전지 수소극 전극에서 서로 다른 가스 확산층에 따른 최적 바인더 함량 결정 Author(s): 전현수; 김도형; 정현승; 박찬호 Abstract: Two different gas diffusion layers having noticeable differences in micro-porous layer’s (MPL’s) crack were studied as a substrate for the gas diffusion electrode (GDE) with different binder/carbon (B/C) ratios in high-temperature polymer electrolyte fuel cell (Ht-PEMFC). As a result, the performance defined as the voltage at 0.2 A/cm2 and maximum power density from the single cells using GDEs from H23 C2 and SGL38 BC with different B/C ratios were compared. GDEs from H23 C2 showed a proportional increase of the voltage with the binder content on the other hand GDEs from SGL38 BC displayed a proportional decline of the voltage to the binder content. It was revealed that MPL crack influences the structure of catalyst layer in GDEs as well as affects the RCathode which is in close connection with the Ht-PEMFC performance. 2022-01-31T15:00:00Z