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Sulfonated PEEK Ion Exchange Membranes for Direct Methanol Fuel Cell Applications
문고영,임지원 한국고분자학회 2007 Macromolecular Research Vol.15 No.4
Sulfonation of polyetheretherketones (PEEK) was carried out in order to fabricate commercial perfluorosulfonic acid membrane alternatives, which were characterized in terms of their ion exchange capacity, ionic conductivity, water swelling, methanol crossover and electrochemical performance in their direct application as a methanol fuel cell. A high ion exchange capacity, 1.88, was achieved with a sulfonation reaction time of 8h, with a significantly low methanol crossover low compared to that of Nafion. However, the morphological stability was found to deteriorate for membranes with sulfonation reaction times exceeding 8h. Electrochemical cell tests suggested that the fabrication parameters of the membrane electrode assembly based on the sulfonated PEEK membranes should be optimized with respect to the physicochemical properties of the newly prepared membranes.Keywords: direct methanol fuel cell, sulfonated PEEK, methanol crossover, membrane, fuel cell.
문고영,임지원 한국고분자학회 2008 Macromolecular Research Vol.16 No.6
The mitigation or elimination of methanol crossover for perfluorosulfonic acid fuel cell membranes has been investigated extensively for direct methanol fuel cell applications with the aim of increasing the electrochemical performance and enhancing the utilization rate of methanol. Self-assembly modifications by applying an oppositely charged polyelectrolyte to Nafion membranes were attempted in order to block or reduce methanol crossover while maintaining the other advantageous properties of Nafion membranes. It was reported that anionic polyallylamine hydrochloride (PAH) was the most efficient polyelectrolyte in reducing methanol crossover, and considerable cell performance was obtained even at a methanol feed concentration of 10 M.
Effects of organic acid catalysts on the hydrogen generation from NaBH4
문고영,이상서,양가람,송광호 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.2
Sodium borohydride has received much attention from fuel cell developers due to its high hydrogen storage capacity. In this study, organic acid solutions such as malic, citric, acetic acids were successfully utilized to accelerate and control hydrogen generation from stabilized sodium borohydride solutions. The generated hydrogen by malic acid was then continuously supplied to a PEMFC single cell. A power density of 168 mW cm−2 was achieved with a hydrogen flow rate of 0.050 L min−1 that was generated by adding 10 wt% aqueous malic acid to the stabilized sodium borohydride solution at an air flow rate of 0.11 L min−1 without humidification. Further increase of power density to 366mW cm−2 is practicable by maintaining a precise hydrogen flow rate of 0.3 L min−1. The current study focuses on the development of an instant hydrogen generation method for micro fuel cell applications. We successfully demonstrated that fast and direct generation of hydrogen could be achieved from stabilized borohydride using inexpensive organic acid solutions rather than expensive metal catalysts and a PEMFC single cell could be operated by generated hydrogen.
문고영(Mun, Go-Yeong),김혁(Kim, Hyeok),유황찬(Yu, Hwang-Chan),김민석(Kim, Min-Seok),노태근(No, Tae-Geun) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
메탄올을 직접 연료로 하는 직접 메탄올 연료전지 (DMFC)는 연료의 높은 에너지 밀도로 인하여 휴대용 전자 기기의 차세대 에너지원으로 주목 받고 있다. 전자기기에 적용하기 위해서는 고성능 소재 부품의 개발, 시스템 통합 등의 고난도 기술이 필요하다. 본고에서는 귀금속 담지량이 절대적으로 감소한 신규 cathode 촉매, 하이브리드 신규 막, 고성능 스텍, 시스템 통합의 개발 경과대해 기술하고 있다.