[논문]고분자 전해질 연료전지 및 수전해용 촉매층의 이오노머 바인더

박종혁; 마하무다아크테르; 김범석; 정다혜; 이민영; 신지윤; 박진수

doi:10.5229/jkes.2022.25.4.174

고분자 전해질 연료전지 및 수전해용 촉매층의 이오노머 바인더
Ionomer Binder in Catalyst Layer for Polymer Electrolyte Membrane Fuel Cell and Water Electrolysis: An Updated Review 원문보기

전기화학회지 = Journal of the Korean Electrochemical Society, v.25 no.4, 2022년, pp.174 - 183

박종혁 (상명대학교 일반대학원 건설.환경.의생명공학과) , 마하무다아크테르 (상명대학교 일반대학원 건설.환경.의생명공학과) , 김범석 (상명대학교 공과대학 그린화학공학과) , 정다혜 (상명대학교 공과대학 그린화학공학과) , 이민영 (상명대학교 공과대학 그린화학공학과) , 신지윤 (상명대학교 공과대학 그린화학공학과) , 박진수 (상명대학교 일반대학원 건설.환경.의생명공학과)

초록
AI-Helper

높은 에너지 밀도와 고순도 수소 생산의 측면에서 고분자 전해질 연료전지와 수전해가 주목받고 있다. 고분자 전해질 연료전지 및 수전해를 위한 촉매층은 귀금속 계열의 전기 촉매와 이오노머 바인더로 구성되어 있는 다공성 전극이다. 이 중 이오노머 바인더는 촉매층 내 이온 전도를 위한 3차원 네트워크 형성과 전극 반응에 필요한 또는 생성되는 물질들의 이동을 위한 기공 형성에 중요한 역할을 수행한다. 상용 과불소계 이오노머의 활용 측면에서 이오노머의 함량, 이오노머의 물성, 그리고 이를 분산시킬 분산 매체에 촉매층의 성능 및 내구성이 크게 달라진다. 현재까지 고분자 전해질 연료전지용 촉매층을 위한 이오노머의 활용 방법은 많은 연구가 진행되어왔으나 고분자 전해질 수전해 적용 방면에서는 촉매층 연구가 다소 미비한 실정이다. 본 총설에서는 현재까지 보고된 연료전지 측면에서의 이오노머 바인더 활용 연구결과를 요약하였으며, 수소 경제 시대의 가속화를 위해서 고분자 전해질 수전해 핵심요소 중 하나인 촉매층용 이오노머 바인더에 관한 연구에 유용한 정보를 제공하고자 한다.

Abstract ▼ AI-Helper

Polymer electrolyte fuel cells and water electrolysis are attracting attention in terms of high energy density and high purity hydrogen production. The catalyst layer for the polymer electrolyte fuel cell and water electrolysis is a porous electrode composed of a precious metal-based electrocatalyst and an ionomer binder. Among them, the ionomer binder plays an important role in the formation of a three-dimensional network for ion conduction in the catalyst layer and the formation of pores for the movement of materials required or generated for the electrode reaction. In terms of the use of commercial perfluorinated ionomers, the content of the ionomer, the physical properties of the ionomer, and the type of the dispersing solvent system greatly determine the performance and durability of the catalyst layer. Until now, many studies have been reported on the method of using an ionomer for the catalyst layer for polymer electrolyte fuel cells. This review summarizes the research results on the use of ionomer binders in the fuel cell aspect reported so far, and aims to provide useful information for the research on the ionomer binder for the catalyst layer, which is one of the key elements of polymer electrolyte water electrolysis to accelerate the hydrogen economy era.

주제어

표/그림 (6)

그림 Fig. 1. General chemical formula for the PFSA ionomers of various forms, shown with key chemical structural parameters governing their phase separated morphology and properties. Impact of EW and side-chain chemistry is highlighted for selected commercial PFSAs. Reprinted with permission from Ref. 28 Copyright^© 2017 American Chemical Society.
그림 Fig. 2. Ionomer network of catalyst layers for proton exchange membrane fuel cell. Represented contents from Ref. 41.
그림 Fig. 4. Surface morphology of catalyst layer coated with ink containing (a) glycerin, (b) ethylene glycol, (c) 1,2-propylene glycol, (d) 1,3-propylene glycol, (e) water, and (f) methanol. Ref. 48 Copyright^© 2011 International Journal of Electrochemical Science.
그림 Fig. 3. Polarization curve of single cell for different MEA. Each curve was the MEA made from dispersion solvent in the catalyst ink. MEA processing condition was at hot press temperature 135 °C, pressure 1200 psi for 90 seconds. Single cell testing condition was at cell temperature 65 °C, anode gas flow rate 100 mL min^-1, humidification temperature 80 °C, cathode gas flow rate 77 mL min^-1 , and humidification temperature 80 °C. Ref. 48 Copyright^© 2011 International Journal of Electrochemical Science.
그림 Fig. 5. (a) OCV variation and linearly extrapolated trajectory to predict the estimated time when 20% OCV loss is reached as a function of time and (b) the estimated life time as a function of the viscosity of the dispersing solvent. Ref. 26 with permission from Elsevier.
그림 Fig. 6. Performance comparison for the different CCMs: (a) cell voltage, (b) HFR and (c) iR-free cell voltage plotted versus the applied current density. The inset in (b) is a Nyquist plot at 0.1 A cm^-2. The high ionomer contents show significantly higher voltages, which also remain in the iR-free cell voltage. Ref. 52 with copyright from Journal of The Electrochemical Society.

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표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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