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논문 : 금속성 응집제와 모노클로라민의 상호작용이 Polyamide계 RO막 성능에 미치는 영향
김경화 ( Kyung Hwa Kim ),홍승관 ( Seung Kwan Hong ),박찬혁 ( Chan Hyuk Park ),윤성로 ( Seong Ro Yoon ),홍성표 ( Seong Pyuo Hong ),이종화 ( Jong Hwa Lee ) 대한상하수도학회 2006 상하수도학회지 Vol.20 No.4
The bench-scale chlorine exposure study was performed to investigate the effect of pretreatment by free chlorine and monochloramine (NH2Cl) on the performance of RO membranes made of polyamide (PA). Feed monochloramination at 2㎎/L did not cause significant productivity loss compared to free chlorine. However, metal coagulants reacted with monochloramine, the PA membrane suffered from a gradual loss of membrane integrity by chlorine oxidation, which was characterized as a decrease in salt rejection. Especially, RO membranes exposed to alum coagulants with monochloramine revealed the salt rejection lower than those exposed to iron coagulants. XPS membrane surface analysis demonstrated that the chlorine uptake on the membrane surface increased and carbon peaks were shifted significantly when exposed to alum coagulants with monochloramine.
MEA 제조 방법에 따른 직접 메탄올 연료전지의 성능저하 현상 평가
조윤환(Cho, Yoon-Hwan),조용훈(Cho, Yong-Hun),박현서(Park, Hyun-Seo),원호연(Won, Ho-Youn),성영은(Sung, Yung-Eun) 한국신재생에너지학회 2007 신재생에너지 Vol.3 No.1
Catalyst coated membrane [CCM] type and catalyst coated substrate [CCS] type of membrane electrode assembly [MEA] were manufactured and evaluated their performance. Degradation test were conducted to find the difference of long term stability in two types of MEA and the factor for performance degradation problem occurred. Performance degradation test of single cell in two different types of MEA were carried out when current density was 200mA/cm^{2}. The degradation test had proceeded for 230 hours and performance degradation was checked by I-V curve and impedance measurement at regular intervals. Also, MEA before/after operation and changes of catalyst layer were characterized by SEM, TEM, and XRD. Maximum power density of CCM type was higher than that of CCS type. Meanwhile, an increase of particle size of catalyst and an increase of impedance resistance after long term operation were observed. In the case of using CCM type MEA, the performance was deteriorated 38% of initial performance. In the case of using CCS type MEA, the performance was deteriorated 43% of initial performance. In consideration of difference of initial performance, performance of CCM type is higher than that of CCS type but both types had similar problems during degradation test.
NaCl 수용액 가습으로 인한 PEMFC 전기화학적 특성 연구
유호준,노혜강,장계은,이영조,송동근,조구영 한국정밀공학회 2022 한국정밀공학회지 Vol.39 No.6
In this study, polymer electrolyte membrane fuel cells (PEMFCs) were humidified with NaCl solutions. NaCl solutions were provided to the cathode side of fuel cells by bubbling. De-Ionized water, 3.5 wt% NaCl solution, and 20 wt% NaCl solution were used to evaluate the effects of NaCl. Current density-voltage curves and electrochemical impedance spectroscopies (EIS) of fuel cells were measured. Additionally, the constant-voltage mode long-term stability of PEMFCs humidified with NaCl solution were investigated. Constant-voltage measurements and EIS results imply that the degradation of fuel cells is clearly related with the concentration of NaCl solutions.