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New multi-phenylene polymer electrolyte containing hexabenzocoronene interior for PEMFC
Lim, Youngdon,Lee, Soonho,Jang, Hohyoun,Yoo, Jiho,Ha, Jaeseong,Ju, Hyunchul,Hong, Taewhan,Kim, Whangi Elsevier 2015 International journal of hydrogen energy Vol.40 No.2
<P><B>Abstract</B></P> <P>The sulfonated poly(ether sulfone)s containing hexabenzocoronene moiety that is partial graphene structure (SPGHPs) for polymer electrolyte membrane were synthesized and characterized their properties. Graphene is predicted to have remarkable properties, such as high thermal conductivity, superior mechanical properties and excellent electronic transport properties. We apply the advantages of graphene properties to polymer electrolyte membranes for improve the durability and performance. Poly(arylene ether sulfone)s containing hexaphenyls on polymer backbone were synthesized by polycondensation and followed intra-cyclization by friedel–craft reaction with lewis acid (FeCl<SUB>3</SUB>) to form partial graphene structure. The sulfonation was taken selectively on hexabenzocoronen units with concentrated sulfuric acid. The structure properties of the sulfonated polymers were investigated by <SUP>1</SUP>H-NMR spectroscopy. The resulted ion exchange capacities (IEC) were 1.09–1.61 meq./g. The water uptakes were 8.84–15.27% at 30 °C and 18.27%∼42.38% at 80 °C with changing the ion exchange capacities. The SPGHP membranes exhibit proton conductivities (80 °C, RH 90) of 78.3–105.7 mS/cm compared with 106.2 mS/cm of Nafion 211<SUP>®</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We synthesize new polymer electrolyte containing hexabenzocoronene moieties. </LI> <LI> We control degree of sulfonation by hexabenzocoronene moiety. </LI> <LI> Increasing sulfonation level increases proton conductivity. </LI> <LI> Membranes have good performance with chemically stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A series of PGHPs were synthesized by polycondensation and followed intra-cyclization by friedel–craft reaction with lewis acid (FeCl<SUB>3</SUB>) to form partial graphene structure. Graphene is predicted to have remarkable properties, such as high thermal conductivity, superior mechanical properties and excellent electronic transport properties. Compared with Nafion 211<SUP>®</SUP> membrane, these SPGHPs show comparable IECs from 1.09 to 1.61 meq./g, water uptake from 18.27 to 42.38%, proton conductivity from 78.3 to 105.7 mS/cm, maximum power densities from 528 to 631 W/cm<SUP>2</SUP> and high thermal stability. The proton conductivity and power density of SPGHP 25 was almost same to Nafion 211<SUP>®</SUP>. These results showed that the morphology of polymer matrix greatly affected the cell performance, and membrane contained graphene structure have excellent dimensional stability in spite of high IEC.</P> <P>[DISPLAY OMISSION]</P>
4차 산업혁명기술의 에너지화 플랜트 디지털트랜스포메이션 전략과 사례
임용택(Lim Yongtaek),유영돈(Yoo Youngdon),김수현(Kim Suhyun) 한국열환경공학회 2020 한국열환경공학회 학술대회지 Vol.2020 No.춘계
2016년 세계경제포럼에서 4차 산업혁명의 도래가 논의되고, 국내외 모든 산업분야에서 4차 산업혁명 관련 기술의 개발과 적용에 많은 노력을 하고 있다. 플랜트 엔지니어링 산업분야에서 이러한 노력의 대표적인 성공 사례는 GE의 Digital Power Plant이며, 많은 해외 선진기업들이 독자적인 기술개발을 통하여 시장을 선점하고 있다. 그러나 국내 플랜트 엔지니어링 분야에서는 많은 노력에도 불구하고 가시적인 성과가 나타나고 있지 않다. 이에 에너지화 플랜트 시스템 개발 R&D 수행과정에서 4차 산업혁명기술을 적용하기 위한 조그마한 노력의 성과를 공유하고. 이를 통하여 플랜트 엔지니어링 분야에 4차 산업혁명기술의 적용에 대한 방향성을 제시하고자 한다. 4차 산업혁명기술을 에너지화 플랜트를 포함하는 플랜트 엔지니어링 분야에 적용하기 위한 전략으로 디지털트랜스포메이션을 제시하고자 하며, 실제 적용한 사례를 통하여 기존의 개념적인 성과가 아닌 구체적인 성과를 제시하고자 한다.
임재환(Jaehwan Lim),전영돈(Youngdon Jeon),김성섭(Sungsup Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
2개의 바퀴를 갖는 축이 존재하는 삼륜형 이륜자동차는 주로 기존의 이륜자동차의 후축을 개조하여 생계형으로 주로 제작한 형태로 운행되고 있다. 구조 특성 상 4개의 바퀴를 갖는 자동차에 비하여 롤전복 등에 대한 주행안정성이 취약하나, 개조 업체 대부분이 영세한 제작소 수준으로 제작하는 과정에서 기술적인 안전을 고려하는 것이 현실적으로 어려운 실정이다. 이 연구에서는 삼륜형 이륜자동차의 구조 및 주행특성을 분석하고, 무게중심에 기반한 삼륜형 이륜자동차의 주행안전성을 예측하였으며, 시험용 삼륜형 이륜자동차를 제작하여 무게중심 측정을 통한 주행안정성 추정 및 실차시험을 통한 검증을 수행하였다.
Lee, Soonho,Jeon, Youngtae,Lim, Youngdon,Cho, Younggil,Lee, Sangyoung,Kim, Whangi Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.9
A new type of solid and gel-state ionics based on siloxane pyridinium iodides was synthesized and used as electrolytes in dye-sensitized solar cells. The resulting electrolytes were characterized by $^1H$ NMR spectroscopy, TGA and diffusion coefficient. The synthesized siloxane pyridinium iodide electrolytes have characteristics of different chain length of siloxane moieties. The ion conductivities were given 2.7-3.2 S/cm. Among the three SiDPIs based electrolytes, DSSC employing the SiDPI2 gives an open circuit voltage of 0.704 V, a short-circuit current of 15.85 $mA/cm^2$ and conversion efficiency of 6.8% under light intensity of 100 $mW/cm^2$. In addition, the performance of the DSSCs showed relatively reasonable compared with the propylpyridinium iodide (PPI) electrolyte.
루버 핀 열교환기를 가지는 자동차용 히트펌프 시스템의 착상 특성 연구
임홍영(Hong Young Lim),송준영(Junyoung Song),신성홍(Sunghong Shin),김학규(Hakkyu Kim),오광헌(Kwanghun Oh),최영돈(Youngdon Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The present study investigated the heating performance and frosting phenomenon of the heat pump system for vehicle, which is being developed to increase fuel efficiency of EV(Electric Vehicle) with maintaining thermal comfort. The experimental setup of a heat pump system consists of an electric compressor, an exterior louvered fin-flat tube condenser, an interior condenser, and an evaporator, block type thermal expansion valve and reservoir tank, which are used in actual HVAC system for vehicle. In this study, frosting phenomenon patterns of outside condenser having uniform air flow rate was visualized and heat pump performance is examined experimentally. In addition, the frosting phenomenon is compared with different compressor rpm. As results, non-uniform frosting phenomenon and non-frosting area in exterior condenser was occurred. The heating performance based on air side of interior condenser outlet was maximized within 4min. The heating performance was reduced 5.3% after 27min and 42% after 90min because of frosting in exterior condenser.