以滴塗製程控制Nafion自組織成膜並提升質子傳導與燃料電池功率密度;Control of self-organization of dropcasted Nafion film for improving proton conduction in PEMFC to raise output power density

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題名:	以滴塗製程控制Nafion自組織成膜並提升質子傳導與燃料電池功率密度;Control of self-organization of dropcasted Nafion film for improving proton conduction in PEMFC to raise output power density
作者:	陳?軒;Chen, Hao-Hsuan
貢獻者:	能源工程研究所
關鍵詞:	脈衝雷射沉積;滴塗質子交換膜;質子交換膜燃料電池;pulsed laser deposition;proton exchange membrane fuel cell;drop casting;nafion
日期:	2021-08-19
上傳時間:	2021-12-07 12:12:12 (UTC+8)
出版者:	國立中央大學
摘要:	本研究使用脈衝雷射沉積法(Pulsed Laser Deposition, PLD)製備Pt 奈米顆粒並應用於燃料電池陰陽極端之觸媒層，並結合滴塗Nafion薄膜(Dropcasted Nafion film)將質子交換膜直接滴塗於觸媒層上，優化觸媒層與質子交換膜的介面，增加質子傳輸之通道，提升觸媒利用率。因滴塗Nafion薄膜製程其Nafion直接進入觸媒層，重新調整其各項參數從滴塗溶液之組成比例、成膜之乾化溫度、組成MEA之熱壓參數，陰陽極觸媒量及膜厚最薄之極限，將之組成燃料電池量測性能及電化學阻抗並透過電化學診斷，去探討及優化滴塗Nafion薄膜整套製程。透過控制乾化過程之溫度，使乾化溫度85°C之滴塗Nafion薄膜相較商用膜其歐姆阻抗下降35%，雖然因使用滴塗製程使Nafion深入觸媒層孔隙會減少氣體傳輸通道，當擔載量為100 μg/cm2其性能相較商用膜低15%，但當擔載量提升至200 μg/cm2時其優點發揮出來，能利用到整體之觸媒電流密度相對擔載量100 μg/cm2時提升近40%之性能，相較商用膜擔載量提升至200 μg/cm2時只提升7%之電流密度。提升擔載量時便提升觸媒層厚度，同時使用商用膜時其質子傳輸受限於質子擴散距離，因增加之觸媒無法有良好質子傳輸，整體觸媒利用率下降，電流密度趨近飽和，而滴塗Nafion薄膜則滲透整層觸媒層使觸媒皆有良好質子傳輸能力於兩大氣壓下性能達到1994.9 mA/cm2。 ;In recent days, efficient green power generation has gained significant attention to control the rise in global warming. Hydrogen energy is considered as the source of energy storage and generation. The proton exchange membrane fuel cell (PEMFC) with higher efficiency is developed with increase in amount of noble metal catalyst, i.e., increasing the thickness of catalyst layer. But, the presence of higher amount of nano porous catalyst layer may not provide efficient transfer of generated protons from anode to cathode due lower contact of membrane with the catalyst. This may decrease the overall performance of PEMFC. This thesis is focused on developing high efficiency PEMFC with efficient proton transfer from anode to cathode with good contact of nafion and porous catalyst in the anode. In this study, Pt nanoparticles are coated on the carbon paper by pulsed laser deposition technique are used as the anode and cathode. Further, nafion is coated on the catalyst by drop casted on the catalyst layer. The drop casted nafion acts as the proton exchange membrane and also offers good contact to the catalyst for fast proton transfer. Processing parameters of the in-situ membrane development (nafion solution composition ratio, drop-casting, drying temperature of film) process, membrane electrode assembly and thickness of the nafion on the performance of PEMFC is well investigated with electrochemical analysis and diagnostics techniques. The amount of the catalyst layer and thickness are also considered in this study. The experimental results of in-situ membrane development shows that, annealing of nafion film at 85 ?C reduces the ohmic resistance by 35 % compared to the PEMFC assembled with commercial MEA as the drop casting of nafion reduces the gas transfer path. The performance of PEMFC with 100 ?g/cm2 catalyst loading is 15 % lower than the commercial PEMFC. But, PEMFC with 200 ?g/cm2 catalyst and in-situ membrane exhibits 40 % higher in performance compared to the commercial PEMFC. This higher performance is achieved with the good intact between the catalyst and nafion (proton exchange) membrane. In commercial MEA, the proton transfer is limited due to the higher thickness of catalyst and lower contact between the catalyst and the membrane. An increase in 7.3% of performance of commercial PEMFC is observed with rise of catalyst loading from 100 ?g/cm2 to 200 ?g/cm2. Whereas, the PEMFC with in-situ MEA exhibits 39.37% with rise of catalyst loading from 100 ?g/cm2 to 200 ?g/cm2. The efficient proton transfer between catalyst and nafion membrane could help in increasing the efficiency of PEMFC. The in-situ MEA (catalyst loading: 200 ?g/cm2) PEMFC exhibits current density of 1454.2 mA/cm2. Further, the same cell exhibits current density of 1994.9 mA/cm2 with 2 atmospheric pressure at anode and cathode. An in-situ proton exchange (nafion) membrane development by simple process for high efficiency PEMFC is demonstrated in this thesis. Also, in-situ membrane development could reduce the cost of PEMFC with reduced cost of membrane. This work helps in designing MEA for high efficiency PEMFC for green power generation.
顯示於類別:	[能源工程研究所 ] 博碩士論文

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