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An anode catalyst support for polymer electrolyte membrane fuel cells: application of organically modified titanium and silicon dioxide

机译：用于聚合物电解质膜燃料电池的阳极催化剂载体：在有机改性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 TiO2 and TiO2-SiO2-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 TiO2-SiO2-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 TiO2 and the hybrid TiO2-SiO2-VTMS-based compound.
机译：该工作描述了尝试改善PEM燃料电池的物理和电化学参数，所述PEM燃料电池具有由钛和二氧化硅改性的电极。提出了一种定制的膜电极组件设计，其特征在于在阴极侧（2.0mgPT cm（-2））处具有大约6倍浓度的催化剂催化剂，以研究阳极催化剂载体处理的影响。使用原始TiO2和TiO2-SiO2-VTMS改性阳极催化剂载体材料 - 通过乙烯基三甲氧基硅烷交联复合物。借助于载体材料及其催化剂混合物的特定组分的BET，BJH，T-PLOT和HORVATH-Kawathoe（H-K）理论进行表面积和孔隙率分析。实验表明，在表面积的方面，阳极催化剂层上的TiO2-SiO2-VTMS（Bet 32​​1.9M（2）G（-1），BJH 3.7nm）的积极影响（3次增加，75米（2） g（-1））和平均孔径（从25.3降至15.7nm）。另外，根据H-K分析结果（10.3M（2）G（-1），0.65nm）将良好的微孔（孔小于2nm）引入材料。电化学实验包括偏振曲线，电化学阻抗光谱和循环伏安法，已经证明了与参考样品的改性阳极的制造燃料电池的行为的变化。减轻电荷和传质阻力（乘15-20％，50mV，200mM（-2）），功率密度的提高（高达72％，217mW cm（-2））和更好的曝光对于通过原始TiO 2和杂合TiO2-SiO 2-VTMS的化合物改性的燃料细胞，观察到电化学反应反应物的催化剂。

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    《RSC Advances》 |2019年第42期|共12页
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  • 正文语种 eng
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