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( Doan Tuan Linh ),이한얼,김태근 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Titanium oxide, forming on surface of the Ti-PTL during the operation, is contributed to high Ohmic resistance of the cell. Covering a thin layer of high corrosion-resistive metal on PTL surface is typical method to prevent this phenomena. Iridium and its compound are usually used in PEMWE due to the low electrical resistivity and high stability under harsh condition. In this study, combining spray-coating and calcination method, IrO2 was deposited on the commercial Ti-PTL surface to limit passivation. 3 samples with different catalyst loading (0.08 mg/cm2, 0.17 mg/cm2, 0.28 mg/cm2) were investigated to access the effect of catalyst loading on the water electrolysis cell performance. The polarization curve results showed that the high catalyst loading (0.28 mg/cm2) and low loading (0.08 mg/cm2) show lower performance than the loading of 0.17 mg/cm2 with about 40mV at 2 A/cm2, despite of the Ohmic resistance increase with the increasing of catalyst loading.
Nguyen, Tuan Lam,Pham, Thi Quynh Nga,Hoang, Van Minh,Kim, Bao Giang,Phan, Thi Hai,Doan, Thu Huyen,Nguyen, Thuy Linh,Duong, Khanh Van,Luong, Ngoc Khue Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Second-hand tobacco smoke (SHS) exposure at home, especially among children, is a serious issue in Viet Nam. During the past decade, much effort has been taken for tobacco control in the country, including various prgorammes aiming to reduce SHS exposure among adults and children. This article analysed trends and factors associated with SHS exposure at home among school children aged 13-15 in Viet Nam, using the Global Youth Tobacco Surveys conducted in 2007 and 2014. Descriptive and inferential statistical methods with logistic regression were applied. Overall, there was a significant reduction in the level of exposure, from 58.5% (95%CI: 57.6-59.3) in 2007 to 47.1% (95%CI: 45.4-48.8) in 2014. Of the associated factors, having one or both parents smoking was significantly associated with the highest odds of SHS exposure at home (OR=5.0; 95%CI: 4.2-6.1). Conversely, having a mother with a college or higher education level was found to be a protective factor (OR=0.5; 95%CI: 0.3-0.8).
PEM 수전해 확산층 표면 특성에 따른 전기화학적 성능 평가 및 분석
이한얼,( Doan Tuan Linh ),김태근 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
PEM(Polymer electrolyte membrane) 수전해 기술은 전해질과 분리막으로 고체 고분자 전해질 막을 이용하여 물을 산소와 수소로 전기 분해하는 기술로서 환경 및 에너지 문제를 해결할 수 있는 수소 생산의 유망한 방법으로서 대두되고 있다. PEM 수전해는 향후 고분자 분리막, 확산층, 촉매 연구에 따라 물 전기분해시 발생하는 전압 손실을 줄임으로써 고전류밀도에서 효율적으로 운전이 가능할 것으로 보고되고 있다. 본 연구에서는 titanium 확산층의 표면 특성 중 하나인 친수성을 개선하여 과전압을 줄이고자 하였다. 친수성을 개선하기 위하여 화학적, 물리적 방법을 적용하였다. 화학적 방법으로는 Titanium 확산층을 50~200°C 온도 범위에서 열처리하였으며, 물리적 방법으로는 sand paper를 사용한 polishing 방법을 사용하였다. 준비된 확산층은 water contact angle을 측정하여 친수성 정도를 분석하였으며, SEM, EDS, XPS 분석을 통하여 물리화학적 분석을 진행하였다. 전기화학적 분석으로는 I-V polarization, HFR 을 진행하여 성능 개선 여부를 확인하였다.