Analysis of Oxygen Transport Resistances in the Catalyst Layers with Different Carbon Supports in PEFC
Analysis of Oxygen Transport Resistances in the Catalyst Layers with Different Carbon Supports in PEFC
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DOI：
10.1149/08613.0171ecst
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
Takayasu Satake;Yutaka Tabe;T. Chikahisa
中科院分区：
文献类型：
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作者：
Takayasu Satake;Yutaka Tabe;T. Chikahisa
为了在聚合物电解质燃料电池中高效利用Pt催化剂，通过实验和模型分析，对阴极催化剂层（CL）中不同碳载体Vulcan和Ketjen black的氧传输阻力进行了评价。为了区分氧传输阻力组分的贡献，在CL孔中、气体与离聚体界面处以及靠近Pt表面的离聚体中，制备了不同结构的CL并测量了这些CL的氧传输阻力。结果表明：在炭黑中，Pt颗粒被排列在碳的外面，Pt表面的氧输运阻力比在炭黑中降低。然而，Vulcan CL的孔隙率变低，CL孔隙中的扩散阻力增大。这表明，使用Vulcan获得更高的孔隙率可以有效降低CL中的氧传输阻力。
For efficient use of Pt catalyst in polymer electrolyte fuel cells, the oxygen transport resistances with different carbon supports, Vulcan and Ketjen black, in the cathode catalyst layer (CL) were evaluated by experiments and model analysis. To distinguish the contributions of resistance components for oxygen transport, in the CL pores, at the interface between gas and ionomer, and in ionomer near the Pt surface, CLs with different structures were fabricated and oxygen transport resistance of these CLs were measured. The results showed that Pt particles are arranged outside the carbon in the CL with Vulcan, and the oxygen transport resistance at the Pt surface is reduced than in the CL with Ketjen black. However, the porosity of the Vulcan CL becomes lower, and the diffusion resistance in the CL pores increases. These suggest that achieving higher porosity with Vulcan is effective to reduce the oxygen transport resistance in the CL.