Effect of metal particle size and Nafion content on performance of MEA using Ir-V/C as anode catalyst
Effect of metal particle size and Nafion content on performance of MEA using Ir-V/C as anode catalyst
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DOI：
10.1016/j.ijhydene.2010.03.022
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发表时间：
2010-06
影响因子：
7.2
通讯作者：
Bing Li;Jinli Qiao;Daijun Yang;R. Lin;H. Lv;Haijiang Wang;J. Ma
中科院分区：
文献类型：
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作者：
Bing Li;Jinli Qiao;Daijun Yang;R. Lin;H. Lv;Haijiang Wang;J. Ma
以IrCl 3和NH 4VO 3为Ir和V的前驱体，在乙二醇中合成了Ir和Ir-V纳米粒子。这些纳米粒子作为阳极催化剂在质子交换膜燃料电池（PEMFC）进行了评价。在还原性气氛中在200 °C下对催化剂进行热处理导致对于氢氧化反应的非常高的电催化活性。燃料电池性能揭示了用于MEA制造的催化剂层中的25%的最佳Nafion离聚物含量。通过X射线衍射（XRD）和透射电子显微镜（TEM）得到的数据的基础上，在电催化剂结构的变化相关的电催化效果进行了讨论。此外，电化学阻抗谱（EIS）和循环伏安法（CV）技术被用于原位评估这些催化剂表面上的氢氧化动力学。在0.598 V和70 °C下获得1016.6 mW cm− 2的最大功率密度，阳极催化剂负载量为0.4 mg（Ir）cm−2。该性能比相同条件下市售Pt/C催化剂高50.7%。此外，我们还测试了负载量为0.1 mg（Ir）cm−2的低负载量阳极催化剂，最大功率密度比负载量为0.4 mg（Pt）cm−2的商业Pt/C催化剂高33.8%。
Ir and Ir-V nanoparticles were synthesized in ethylene glycol using IrCl3and NH4VO3as the Ir and V precursors, respectively. These nanoparticles were evaluated as anode catalysts in proton exchange membrane fuel cells (PEMFCs). A thermal treatment of the catalysts at 200 °C in a reducing atmosphere leads to very high electrocatalytic activity for the hydrogen oxidation reaction. The fuel cell performance reveals an optimal Nafion ionomer content of 25% in the catalyst layer used for the MEA fabrication. The electrocatalytic effects related to the change in the electrocatalyst structure are discussed based on the data obtained by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In addition, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques are used in-situ to assess the kinetics of hydrogen oxidation on the surface of these catalysts. A maximum power density of 1016.6 mW cm−2was obtained at 0.598 V and 70 °C with an anode catalyst loading of 0.4 mg (Ir) cm−2. This performance is 50.7% higher than that for commercially available Pt/C catalysts under the same conditions. In addition, we also tested the anode catalyst with a low loading of 0.1 mg (Ir) cm−2, the maximum power density is 33.8% higher than that of the commercial Pt/C catalyst with a loading of 0.4 mg (Pt) cm−2.