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비담지 Co-B, Co-P-B 촉매를 이용한 NaBH4 가수분해 반응
오성준 ( Sung June Oh ),정현승 ( Hyeon Seong Jung ),정재진 ( Jae Jin Jeong ),나일채 ( Il Chai Na ),안호근 ( Ho Geun Ahn ),박권필 ( Kwon Pil Park ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.1
Sodium borohydride, NaBH4, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells(PEMFCs). Properties of NaBH4 hydrolysis reaction using unsupported Co-B, Co-P-B catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of NaBH4 concentration and durability of catalyst were measured. The BET surface area of unsupported Co-B catalyst was 75.7 m2/g and this value was 18 times higher than that of FeCrAlloy supported Co-B catalyst. The hydrogen yield of NaBH4 hydrolysis reaction by unsupported catalysts using 20~25 wt% NaBH4 solution was 97.6~98.5% in batch reactor. The hydrogen yield decrease to 95.3~97.0% as the concentration of NaBH4 solution increase to 30 wt%. The loss of unsupported catalyst was less than that of FeCrAlloy supported catalyst during NaBH4 hydrolysis reaction and the loss increased with increasing of NaBH4 concentration. In continuous reactor, hydrogen yield of NaBH4 hydrolysis was 90% using 1.2 g of unsupported Co-P-B catalyst with 3ℓ/min hydrogen generation rate.
바나듐 레독스 흐름전지용 Poly(arylene ether sulfone) 막의 특성
오성준 ( Sung June Oh ),정재현 ( Jae Hyeon Jeong ),신용철 ( Yong Cheol Shin ),이무석 ( Moo Seok Lee ),이동훈 ( Dong Hoon Lee ),추천호 ( Cheun Ho Chu ),김영숙 ( Young Sook Kim ),박권필 ( Kwon Pil Park ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.6
Recently, there are many efforts focused on development of Redox Flow Battery (RFB) for large energy storage system. Economical hydrocarbon membranes alternative to fluorinated membranes for RFB membrane are receiving attention. In this study, characteristics of poly(arylene ether sulfone) (PAES) were compared with expensive fluorinated membrane at VRB (Vanadium Redox Flow Battery) operation condition. Permeability of vanadium ion through membrane, ion exchange capacity (IEC), change of OCV, swelling, charge-discharge curves and energy efficiency were measured. PAES membrane showed lower permeability of vanadium ion, higher IEC and then higher energy efficiency compared with Nafion 117 membranes.
NaBH4 가수분해 반응기 소재로서 알루미늄 합금의 특성 연구
정현승 ( Hyeon Seong Jung ),오성준 ( Sung June Oh ),정재진 ( Jae Jin Jeong ),나일채 ( Il Chai Na ),추천호 ( Cheun Ho Chu ),박권필 ( Kwon Pil Park ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.6
Aluminum alloy was examined as a material of low weight reactor for hydrolysis of NaBH4. Aluminum is dissolved with alkali, but there is NaOH as a stabilizer in NaBH4 solution. To decrease corrosion rate of aluminum, decrease NaOH concentration and this result in loss of NaBH4 during storage of NaBH4 solution. Therefore stability of NaBH4 and corrosion of aluminum should be considered in determining the optimum NaOH concentration. NaBH4 stability and corrosion rate of aluminum were measured by hydrogen evolution rate. NaBH4 stability was tested at 20~50 oC and aluminum corrosion was measured at 60~90 oC. The optimum concentration of NaOH was 0.3 wt%, considering both NaBH4 stability and aluminun corrosion. NaBH4 hydrolysis reaction continued 200min in aluminum No 6061 alloy reactor with 0.3 wt% NaOH at 80~90 oC.
고분자전해질 연료전지의 성능에 미치는 습도와 플러딩의 영향
황병찬 ( Byungchan Hwang ),정회범 ( Hoi-bum Chung ),송명현 ( Myung-hyun Song ),오성준 ( Sung-june Oh ),나일채 ( Il-chai Na ),박권필 ( Kwonpil Park ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.3
Humidity affect performance and durability of proton exchange membrane fuel cell (PEMFC). High humidity of gases generally enhance the performance, but high humidity have the danger of flooding. I-V performance, linear sweep voltammetry, cyclo voltammetry, and impedance of micro-channel cell measured with change of relative humidity (RH). Flooding phenomena started at RH 70%. Ion conductivity of membrane reached maximum value at RH 80%. Maximum current density of 1,700 mA/㎠ (at 0.6 V) was obtained at RH 80%. Therefore the effect of ion conductivity increasement was higher than that of mass transfer decrease by flooding at RH 80%.
고분자 전해질 연료전지에서 sPEEK 막을 이용한 전극과 막 합체(MEA)의 열화에 관한 연구
이혜리 ( Hye-ri Lee ),이세훈 ( Se-hoon Lee ),황병찬 ( Byung-chan Hwang ),나일채 ( Il-chai Na ),이정훈 ( Jung-hun Lee ),오성준 ( Sung-june Oh ),박권필 ( Kwon-pil Park ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.3
Recently, there are many efforts focused on development of more economical non-fluorinated membranes for PEMFCs (Proton Exchange Membrane Fuel Cells). In this study, to test the durability of sPEEK MEA (Membrane and Electrode Assembly), ADT (Accelerated Degradation Test) of MEA degradation was done at the condition that membrane and electrode were degraded simultaneously. Before and after degradation, I-V polarization curve, hydrogen crossover, electrochemical surface area, membrane resistance and charge transfer resistance were measured. Although the permeability of hydrogen through sPEEK membrane was low, sPEEK membrane was weaker to radical evolved at low humidity and OCV condition than fluorinated membrane such as Nafion. Performance after MEA degradation for 144 hours and 271 hours were reduced by 15% and 65%, respectively. It was showed that the main cause of rapid decrease of performance after 144 hours was shorting due to Pt/C particles in the pinholes.
sPEEK 막으로 제조한 고분자전해질 연료전지(PEMFC) 막전극합체(MEA)의 특성
이혜리 ( Hye-ri Lee ),이세훈 ( Se-hoon Lee ),황병찬 ( Byung-chan Hwang ),나일채 ( Il-chai Na ),이정훈 ( Jung-hun Lee ),오성준 ( Sung-june Oh ),박권필 ( Kwon-pil Park ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2
Recently, there are many efforts focused on development of more economical non-fluorinated membranes for use in PEMFCs (Proton Exchange Membrane Fuel Cells). In this study, characteristics of sulfonated Poly(ether ether ketone) (sPEEK) were compared according to degrees of sulfonation (DS), relative humidity, cell temperatures at PEMFC operation condition. I-V polarization curve, hydrogen crossover, electrochemical surface area, membrane resistance and charge transfer resistance were measured. sPEEK membrane showed high performance at high DS, high temperature and high relative humidity, in particular, performance of sPEEK membrane decreased largely due to low ionic conductivity at low DS and low relative humidity.