• 멤브레인
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• 제17권1호
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• pp.37-43
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• 2007

크로노포텐시오미터(CP)와 전류-전압곡선(I-V)을 사용하여 음/양 이온 교환 층의 영향을 하전 모자이크 막에서 조사하였다. 역시 전해질과 음/양이온의 계면에서 이온수송을 실험하였다. 결과 음/양이온 교환 막은 전류범위에서 점점 전압강하가 나타났고, 특히 저 농도의 KCl 전위는 일정하였다. 한편 복합 하전 모자이크 막은 여러 전해질 수용액의 종류와 농도에 관계없이 전위의 변화는 없었다. CP와 I-V의 측정은 이온교환 막 계면에서 일어나는 이온수송에 대한 기초해석으로 대단히 유효하였다.

• 한국막학회:학술대회논문집
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• 한국막학회 2004년도 Proceedings of the second conference of aseanian membrane society
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• pp.109-112
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• 2004

The charged mosaic membranes having cation and anion exchange mixed groups within membrane were researched. The composite charged mosaic membrane was investigated from simultaneous transport such as solute and solvent flux. On the other hand, the reflection coefficient and salt flux coefficient were estimated by taking account of the cross constants of the phenomenological equation.(omitted)

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.129.2-129.2
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• 2010

AEM which were used for solid alkaline fuel cell(SAFC) were prepared by photo polymerization in method pore-filling with various quaternary ammonium cationic monomers and crosslinkers without an amination process. Their specific thermal and chemical properties were characterized through various analyses and the physico-chemical properties of the prepared electrolyte membranes such as swelling behavior, ion exchange capacity and ionic conductivity were also investigated in correlation with the electrolyte composition. The polymer electrolyte membranes prepared in this study have a very wide hydroxyl ion conductivity range of 0.01 - 0.45S/cm depending on the composition ratio of the electrolyte monomer and crosslinking agent used for polymerization. However, the hydroxyl ion conductivity of the membranes was relatively higher at the whole cases than those of commercial products such as A201 membrane of Tokuyama. These pore-filling membranes have also excellent properties such as smaller dimensional affects when swollen in solvents, higher mechanical strength, lowest electrolyte crossover through the membranes, and easier preparation process compared of traditional cast membranes. The prepared membranes were then applied to solid alkaline fuel cell and it was found comparable fuel cell performance to A201 membrane of Tokuyama.

• Journal of Microbiology and Biotechnology
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• 제23권1호
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• pp.36-39
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• 2013

We introduce a high-performance microbial fuel cell (MFC) that was operated using a 0.1M bicarbonate buffer as the cathodic electrolyte. The MFC had a 136.42 $mW/m^2$ maximum power density under continuous feeding of 5 mM acetate as fuel. Results of the electrode potential measurements showed that the cathode potential of the bicarbonate-buffered condition was higher than the phosphate-buffered condition, although the phosphate condition had less interfacial resistance between the membrane and electrolyte. Therefore, we posit here that the increased power of the bicarbonate-buffered MFC may be caused by the higher cathode potential rather than by the interfacial membrane-electrolyte resistance.

• 공업화학전망
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• 제24권4호
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• pp.1-21
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• 2021

화석연료의 과도한 사용으로 유발된 기후변화 문제를 해결하기 위해 대체에너지의 개발에 대한 관심이 높아지고 있는 가운데 재생가능하며 친환경적인 수소에너지가 실현가능한 궁극적 대안으로 주목받고 있다. 다양한 수소 생산 기술 중 물의 전기분해를 이용한 수전해 기술은 온실가스와 같은 오염물질을 배출하지 않으며 재생에너지와 연계하여 미이용 전력을 대용량 장주기로 저장할 수 있다는 장점이 있다. 수전해 장치는 수소와 산소를 발생하는 전극과 기체의 섞임을 방지하고 이온을 전달하는 분리막으로 구성되며 그 중 분리막은 수전해 장치의 효율과 안정성을 결정짓는 핵심 부품이다. 본 총설에서는 수전해 기술 중 저온 수전해에 해당하는 알칼라인 수전해(alkaline water electrolysis), 고분자전해질막 수전해(polymer electrolyte membrane water electrolysis)와 음이온교환막 수전해(anion exchange membrane water electrolysis)에 사용되는 분리막에 대한 특성을 분석하고 최근 연구 동향에 대해서 다루고자 한다.

• 멤브레인
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• 제30권5호
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• pp.350-358
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• 2020

본 연구에서는 다공성 탄소 전극의 음극과 양극 표면에 각각 양이온교환고분자(Nafion)와 음이온교환고분자(aminated polyphenylene oxide, APPO)를 코팅하여 막 결합형 축전식 탈염(membrane capacitive deionization, MCDI) 공정에 적용하였다. 또한 위 공정의 성능을 탄소 전극만으로 구성한 축전식 탈염(capacitive deionization, CDI) 공정과 비교 평가해 보고 염 제거 효율이 최대로 나타나는 MCDI 공정의 최적 운전 조건을 탐색하고자 하였다. 염 제거 효율은 MCDI 공정이 CDI 공정에 비해 높게 나타났으며 Nafion과 APPO를 적용한 MCDI 공정에서 흡착 조건이 1.2 V, 3 min이고 탈착 조건이 -1.0 V, 1 min 일 때의 염 제거 효율이 82.1%로 최댓값을 보임을 확인했다.

• 멤브레인
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• 제13권1호
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• pp.54-63
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• 2003

피리디니움 (pyridunium) 그룹을 포함한 음이온교환막의 제조 및 전기화학적 특성 평가를 수행하였다. 실험 결과, 제조된 피리디니움 음이온교환막은 상용막과 대등한 전기저항 ($3.0 {\Xi}cm^2$>, in 0.5 mol $dm^{-3}$ NaCl) 및 높은 이온선택도 ($Cl^-$ 이온수송수 약 0.97)의 우수한 전기화학적 특성을 나타내었다. 또한 피리니디움 그룹을 함유한 음이온교환막에서의 물분해는 상용막 (AM-1, Tokuyama Corp., Japan)에 비해 동일한 전류밀도 하에서 약 100배 내지 1000배 가량 낮게 측정되었는데 이는 4차 아로마틱 피리디니움 그룹의 공명효과 (resonance effect)가 이온교환기의 분자구조적 안정성에 영향을 미쳤기 때문으로 사료되었다. 또한 피리디니움 음이온교환막의 전기투석 특성이 semi-pilot 스케일에서 평가되었다.

• 한국표면공학회지
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• 제49권2호
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• pp.159-165
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• 2016

The hydrogen has been recognized as a clean, nonpolluting and unlimited energy source that can solve fossil fuel depletion and environmental pollution problems at the same time. Water electrolysis has been the most attractive technology in a way to produce hydrogen because it does not emit any pollutants compared to other method such as natural gas steam reforming and coal gasification etc. In order to improve efficiency and durability of the water electrolysis, comprehensive studies for highly active and stable electrocatalysts have been performed. The platinum group metal (PGM; Pt, Ru, Pd, Rh, etc.) electrocatalysts indicated a higher activity and stability compared with other transition metals in harsh condition such as acid solution. It is necessary to develop inexpensive non-noble metal catalysts such as transition metal oxides because the PGM catalysts is expensive materials with insufficient it's reserves. The optimization of operating parameter and the components is also important factor to develop an efficient water electrolysis cell. In this study, we optimized the operating parameter and components such as the type of AEM and density of gas diffusion layer (GDL) and the temperature/concentration of the electrolyte solution for the anion exchange membrane water electrolysis cell (AEMWEC) with the transition metal oxide alloy anode and cathode electrocatalysts. The maximum current density was $345.8mA/cm^2$ with parameter and component optimization.

• 한국재료학회지
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• 제28권11호
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• pp.633-639
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• 2018

In anion exchange membrane fuel cells, Pd nanoparticles are extensively studied as promising non-Pt catalysts due to their electronic structure similar to Pt. In this study, to fabricate Pd nanoparticles well dispersed on carbon support materials, we propose a synthetic strategy using mixed organic ligands with different chemical structures and functions. Simultaneously to control the Pd particle size and dispersion, a ligand mixture composed of oleylamine(OA) and trioctylphosphine(TOP) is utilized during thermal decomposition of Pd precursors. In the ligand mixture, OA serves mainly as a reducing agent rather than a stabilizer since TOP, which has a bulky structure, more strongly interacts with the Pd metal surface as a stabilizer compared to OA. The specific roles of OA and TOP in the Pd nanoparticle synthesis are studied according to the mixture composition, and the oxygen reduction reaction(ORR) activity and durability of highly-dispersed Pd nanocatalysts with different particles sizes are investigated. The results of this study confirm that the Pd nanocatalyst with large particles has high durability compared to the nanocatalyst with small Pd nanoparticles during the accelerated degradation tests although they initially indicated similar ORR performance.

• 한국표면공학회지
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• 제55권3호
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• pp.180-186
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• 2022

The production of hydrogen via water electrolysis (i.e., green hydrogen) using renewable energy is key to the development of a sustainable society. However, most current electrocatalysts are based on expensive precious metals and require the use of highly purified water in the electrolyte. We demonstrated the preparation of a non-precious metal catalyst based on CuCo₂O₄ (CCO) via simple electrodeposition. Further, an optimization process for electrodeposition potential, solution concentration and electrodeposition method was develop for a catalyst-substrate integrated electrode, which indicated the highly electrocatalytic performance of the material in electrochemical tests and when applied to an anion exchange membrane water electrolyzer.