알칼리막 연료전지용 전극의 제조방법에 따른 전기화학적 특성 분석
Electrochemical Characteristics of Electrode by Various Preparation Methods for Alkaline Membrane Fuel Cell
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
최근에 알칼리막연료전지의 막전극접합체에서 이오노머에 의한 촉매 피독에 대한 연구 결과들이보고되고 있다. 본 연구에서는 이를 해결하기 위해서 전극 제조 시에 사용되는 유기용매의 성분을 조절하여 막전극접합체의 성능을 향상시키고자 하였다. Fuma-Tech사의 상용 이오노머를 사용하여 N-Methyl-2-pyrrolidone (NMP)와 Ethylene glycol (EG)를 이용한 4가지의 혼합용매를제조하였다. 혼합용액을 이용하여 제조된 캐소드 전극은 NMP기반의 상용 이오노머에 비해서 약36%의 향상된 분극성능을 나타내었다. 이것은 용매의 종류에 따른 이오노머의 분산성 차이에 따른 결과로 추측되며 비균일성 분포의 이오노머가 전극의 성능을 향상시키는 것으로 관찰되었다. 이에 관한 원인분석을 위해서 막전극 접합체의 고주파 저항, 내부저항 보정 분극곡선, Tafel 기울기, Mass activity 및 임피던스 분광법을 사용하여 특성 분석을 실시하였다. 이오노머의 비용매의 비율 증가에 따라서 캐소드 전극 성능이 개선되는 것을 확인하였고, 이것은 이오노머의 입도 분포에 따라서 촉매의 피독이 감소되는 결과로 판단된다.
Abstract
Catalyst poisoning by ionomers in membrane electrode assemblies of alkaline membrane fuel cells has been reported recently. We tried to improve the membrane electrode assembly's performance by controlling the solvent's ratio during electrode manufacturing. 4 Different mixing ratios of N-Methyl-2-pyrrolidone (NMP) and ethylene glycol (EG) gave four different cathode electrodes with platinum and Fuma-Tech ionomers. The electrode with higher EG improved polarization performance by about 36% compared to the NMP-based commercial ionomer. The dependence of the ionomer's dispersibility on the solvent seems responsible for the difference, which means that the non-uniform distribution of ionomers improves the performance of the electrode. High-frequency resistance, internal resistance corrected polarization curve, Tafel slope, mass activity, and impedance spectroscopy characterized the electrode. We can find that the existence of poor solvent improves cathode electrode performance. It seems to be the result of reduced poisoning of the catalyst according to the particle size distribution of the ionomer.
참고문헌 (28)
- Q. He, "Review—Recent Progress in Electrocatalysts for Oxygen Reduction Suitable for Alkaline Anion Exchange Membrane Fuel Cells", Journal of The Electrochemical Society, 162, pp.F1504~F1539 (2015)
- T. J. Omasta, "Importance of balancing membrane and electrode water in anion exchange membrane fuel cells", Journal of Power Sources, 375, pp.205~213 (2018)
- T. J. Omasta, "Improving Performance in Alkaline Membrane Fuel Cells through Enhanced Water Management", ECS Transactions, 75, pp.949~957 (2016)
- T. J. Omasta, "Beyond catalysis and membranes:Visualizing and solving the challenge of electrode water accumulation and flooding in AEMFCs", Energy and Environmental Science, 11, pp.551~558 (2018)
- H. Yanagi, "Anion Exchange Membrane and Ionomer for Alkaline Membrane Fuel Cells (AMFCs)", ECS Transactions, 16, pp.257~262 (2019)
- Y. Zheng, "Quantifying and elucidating the effect of CO2 on the thermodynamics, kinetics and charge transport of AEMFCs", Energy & Environmental Science, 12, pp.2806~2819 (2019)
- 배병찬, "알칼리연료전지용 음이온교환전해질막의 연구 동향 및 전망", 신재생에너지, 11(4), pp.52~61 (2015), 한국신·재생에너지학회[DOI]
- I. Matanovic, "Adsorption of Polyaromatic Backbone Impacts the Performance of Anion Exchange Membrane Fuel Cells", Chemistry of Materials, 31, pp.4195~4204 (2019)
- I. Matanovic, "Benzene Adsorption: A Significant Inhibitor for the Hydrogen Oxidation Reaction in Alkaline Conditions", The Journal of Physical Chemistry Letters, 8, pp.4918~4924 (2017)
- H. T. Chung, "Cation–Hydroxide–Water Coadsorption Inhibits the Alkaline Hydrogen Oxidation Reaction", The Journal of Physical Chemistry Letters, 7, pp.4464~4469 (2016)
- E. S. Davydova, "Electrocatalysts for Hydrogen Oxidation Reaction in Alkaline Electrolytes", ACS Catalysis, 8, pp.6665~6690 (2018)
- D. Li, "Impact of ionomer adsorption on alkaline hydrogen oxidation activity and fuel cell performance", Current Opinion in Electrochemistry, 12, pp.189~195 (2018)
- D. Li, "Phenyl Oxidation Impacts the Durability of Alkaline Membrane Water Electrolyzer", ACS Applied Materials & Interfaces, 11, pp.9696~9701 (2019)
- D. Strmcnik, "The role of non-covalent interactions in electrocatalytic fuel-cell reactions on platinum", Nature Chemistry, 1, pp.466~472 (2009)
- W. Heiland, "Kinetic and Thermodynamic Aspects of the Electrosorption of Benzene on Platinum Electrodes", The Journal of Physical Chemistry, 70, pp.1207~1216 (1966)
- M. P. Soriaga, "Determination of the orientation of adsorbed molecules at solid-liquid interfaces by thin-layer electrochemistry: aromatic compounds at platinum electrodes", Journal of the American Chemical Society, 104, pp.2735~2742 (1982)
- T. Reshetenko, "Study of the aromatic hydrocarbons poisoning of platinum cathodes on proton exchange membrane fuel cell spatial performance using a segmented cell system", Journal of Power Sources, pp.333~ (2016)
- Z. Xie, "Nafion Ionomer Aggregation and its Influence on Proton Conduction and Mass Transport in Fuel Cell Catalyst Layers", ECS Transactions, 16, pp.1811~1816 (2008)
- J. H. Lee, "Dispersion-Solvent Control of Ionomer Aggregation in a Polymer Electrolyte Membrane Fuel Cell", Scientific Reports, 8, pp.10739~ (2018)
- B. Britton, "The Control and Effect of Pore Size Distribution in AEMFC Catalyst Layers", Journal of The Electrochemical Society, 163, pp.F353~F358 (2016)
- X. Shi, "Maximization of quadruple phase boundary for alkaline membrane fuel cell using non-stoichiometric α-MnO2 as cathode catalyst", International Journal of Hydrogen Energy, 44, pp.1166~1173 (2019)
- D. Sebastián, "Optimization of the Catalytic Layer for Alkaline Fuel Cells Based on Fumatech Membranes and Ionomer", Catalysts, 10, pp.1353~ (2020)
- H. J. Park, "Effect of N-cyclic cationic groups in poly(phenylene oxide)-based catalyst ionomer membranes for anion exchange membrane fuel cells", Journal of Membrane Science, 608, pp.118183~ (2020)
- M. S. Cha, "Poly(carbazole)-based anion-conducting materials with high performance and durability for energy conversion devices", Energy & Environmental Science, 13, pp.3633~3645 (2020)
- J. Zhang, "Self-adjusting anode catalyst layer for smart water management in anion exchange membrane fuel cells", Cell Reports Physical Science, 2, pp.100377~ (2021)
- T. Yoda, "Gas diffusion electrodes containing sulfonated poly (arylene ether) ionomer for PEFCs", Electrochimica Acta, 54, pp.4328~4333 (2009)
- B. Bae, "Sulfonated Poly (arylene ether sulfone ketone) Multiblock Copolymers with Highly Sulfonated Block. Synthesis and Properties", Macromolecules, 43, pp.2684~2691 (2010)
- T. Reshetenko, "Analysis of alkaline exchange membrane fuel cells performance at different operating conditions using DC and ACmethods", Journal of Power Sources, 375, pp.185~190 (2018)