發展白金奈米顆粒裝飾奈米碳球殼堆疊層做為 質子交換膜燃料電池之觸媒層;Pt Nanoparticles-decorated Carbon Nanoshell Stack as Catalyst Layers for Proton Exchange Membrane Fuel Cells

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题名:	發展白金奈米顆粒裝飾奈米碳球殼堆疊層做為質子交換膜燃料電池之觸媒層;Pt Nanoparticles-decorated Carbon Nanoshell Stack as Catalyst Layers for Proton Exchange Membrane Fuel Cells
作者:	張嘉芳;Chang, Chia-Fang
贡献者:	機械工程學系
关键词:	質子交換膜燃料電池;奈米碳球殼;觸媒載體;碳化;觸媒減量;滴塗;PEMFC;Carbon nanoshell;Catalyst support;Carbonization;Catalyst reduction;Drop-casting
日期:	2024-07-26
上传时间:	2024-10-09 17:22:43 (UTC+8)
出版者:	國立中央大學
摘要:	本研究發展白金奈米顆粒裝飾奈米碳球殼堆疊層做為質子交換膜燃料電池之觸媒層，結合滴塗Nafion薄膜做為質子傳導通道用於低溫型質子交換膜燃料電池。製備奈米碳球殼載體可有效增加觸媒層表面積，提高觸媒分散性及利用率。以 390℃ 為碳化溫度，可使葡萄糖完全碳化，並且保留碳紙上的疏水層，以利白金觸媒有更好的空間分布。在白金還原反應溫度 50℃、6小時及六氯鉑酸前趨物濃度1 mM時，可得到平均粒徑大小為3.43 nm且高分散性的奈米白金觸媒。以循環伏安法測試電化學活性表面積，可得到奈米碳球殼觸媒層 MSECSA 為 10.19 m2/gpt。以填充密度 25 % 滴塗 Nafion 薄膜於觸媒層組裝成低溫燃料電池，在 0.6 V 下電流密度可達 406 mA/cm2，已相當具有發展潛力。奈米碳球殼觸媒層的大孔洞可使Nafion有效覆蓋球殼表面，結合適當的滴塗濃度使其在球殼間也能保有氣體傳導通道。白金奈米顆粒裝飾奈米碳球殼堆疊層的觸媒結構，具備優異的氣體傳導特性及觸媒利用率，並利用滴塗Nafion薄膜改善觸媒層與質子交換膜之接觸形成良好的質子傳導通道，可增加其三相界面，有效提升電池性能。;This study develops a catalyst layer for proton exchange membrane fuel cells (PEMFCs) using platinum nanoparticles decorated on carbon nanoshell stack, combined with a drop-casting Nafion thin film as a proton conduction channel for LT-PEMFCs. The preparation of the carbon nanoshell stack effectively increases the surface area of the catalyst layer, enhancing catalyst dispersion and utilization. Carbonization at 390℃ ensures complete carbonization of glucose while retaining the PTFE in the carbon paper, facilitating better spatial distribution of the platinum catalyst. Under a reduction reaction temperature of 50°C, a duration of 6 hours, and a precursor concentration of 1 mM H2PtCl6·(H2O)6, a highly dispersed platinum nanoparticle catalyst with an average particle size of 3.43 nm can be obtained. Electrochemical surface area (ECSA) testing by cyclic voltammetry yields an MSECSA of 10.19 m2/gpt for the Pt nanoparticles decorated carbon nanoshell stack as catalyst layers. Assembling the low temperature fuel cell by drop-casting a Nafion thin film with a filling density of 25% on the catalyst layer achieves a current density of 406 mA/cm² at 0.6 V, indicating significant development potential. The macropores in the carbon nanoshell stack catalyst layer allow effective Nafion coverage on the sphere surface, and the appropriate drop-casting concentration ensures gas conduction channels remain between the spheres. Pt nanoparticles-decorated carbon nanoshell stack as catalyst layers exhibits excellent gas conduction properties and catalyst utilization. The drop-casted Nafion thin film improves the contact between the catalyst layer and the proton exchange membrane, forming a good proton conduction channel, effectively increasing the three-phase boundary and enhancing fuel cell performance.
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