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首页> 外文期刊>RSC Advances >An anode catalyst support for polymer electrolyte membrane fuel cells: application of organically modified titanium and silicon dioxide
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An anode catalyst support for polymer electrolyte membrane fuel cells: application of organically modified titanium and silicon dioxide

机译：聚合物电解质膜燃料电池的阳极催化剂载体：有机改性的钛和二氧化硅的应用

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This work describes an attempt to improve the physical and electrochemical parameters of PEM fuel cells that have electrodes modified by titanium and silicon dioxides. A customized design of membrane electrode assemblies was proposed which is characterized to have an around 6 times higher concentration of catalyst at the cathode side (2.0 mgPt cm ~(?2) ) in order to investigate the influence of anode catalyst support treatment. Anode catalyst support materials were modified using pristine TiO _(2) and TiO _(2) –SiO _(2) –VTMS – the composite was crosslinked with the aid of vinyltrimethoxysilane. Surface area and porosity analysis was carried out with the aid of BET, BJH, t-plot and Horvath–Kawazoe (H–K) theories for particular components of the support materials and their catalyst mixtures. The experiment revealed a positive influence of TiO _(2) –SiO _(2) –VTMS (BET 321.9 m ~(2) g ~(?1) , BJH 3.7 nm) on the anode catalyst layer in terms of surface area (3-times increase, 75 m ~(2) g ~(?1) ) and average pore size (decrease from 25.3 to 15.7 nm). Additionally, favourable microporosity (pores less than 2 nm) was introduced to the material according to the H–K analysis results (10.3 m ~(2) g ~(?1) , 0.65 nm). Electrochemical experiments, which include polarization curves, electrochemical impedance spectroscopy and cyclic voltammetry, have demonstrated the change of behaviour for the fabricated fuel cells with modified anodes against the reference sample. The mitigation of charge and mass transfer resistance (by 15–20%, 50 mV at 200 mA cm ~(?2) ), the improvement of power density (up to 72%, 217 mW cm ~(?2) ) and a better exposure of the catalyst to the reactants of an electrochemical reaction were observed for fuel cells modified by both pristine TiO _(2) and the hybrid TiO _(2) –SiO _(2) –VTMS-based compound.
机译：这项工作描述了一种尝试，以改善具有被钛和二氧化硅改性的电极的PEM燃料电池的物理和电化学参数。为了研究阳极催化剂载体处理的影响，提出了定制的膜电极组件设计，其特征在于在阴极侧具有约6倍高的催化剂浓度（2.0mgPt·cm 2（Δ2））。使用原始TiO _（2）和TiO _（2）–SiO _（2）–VTMS改性了阳极催化剂载体材料–借助乙烯基三甲氧基硅烷使复合材料交联。表面积和孔隙率分析是通过BET，BJH，t-图和Horvath-Kawazoe（H-K）理论对载体材料及其催化剂混合物的特定成分进行的。实验揭示了TiO _（2）-SiO _（2）-VTMS（BET 321.9 m〜（2）g〜（？1），BJH 3.7 nm）对阳极催化剂层的表面积有积极影响。增加3倍，分别为75 m〜（2）g〜（？1）和平均孔径（从25.3减小至15.7 nm）。另外，根据H–K分析结果（10.3 m〜（2）g〜（？1），0.65 nm），将有利的微孔率（孔径小于2 nm）引入到材料中。电化学实验，包括极化曲线，电化学阻抗谱和循环伏安法，已经证明了带有修饰阳极的燃料电池对参考样品的性能变化。降低电荷和传质阻力（在200 mA cm〜（？2）时降低15–20％，50 mV），提高功率密度（高达72％，217 mW cm〜（？2）），并且对于由原始TiO _（2）和杂化TiO _（2）-SiO _（2）-VTMS基化合物改性的燃料电池，观察到催化剂对电化学反应反应物的更好暴露。

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