Considering the importance of the fuel cells, we developed an appropriate and efficient electrode system for electrocatalytic oxidation of methanol by fabricating the electrode with naturally based synthesized mobil composition of matter No. 41 (MCM-41) mesoporous silica nanoparticle along with silver and titanium dioxide nanoparticles. The extracted silica from natural stem straw was applied in the synthesis of MCM-41 mesoporous silica nanoparticle and characterization of the products was performed by different techniques. Then, the synthesized MCM-41 mesoporous silica is modified by silver and titanium dioxide nanoparticles and is employed in the fabrication of the modified carbon paste electrodes (Ag/TiO₂/MCM-41/CPE) that are accordingly used in the electrocatalytic oxidation of methanol. The mechanistic and kinetic studies of the reactions are thoroughly examined based on cyclic voltammetry and chronoamperometry techniques. The results reveal that the modified carbon paste electrode with silver and titanium dioxide nanoparticles supported onto MCM-41 mesoporous silica exhibit much higher current densities and less overpotentials than that at the bare carbon paste electrode. The results of the electrocatalytic oxidation of methanol are then compared to the literature indicating that the developed system is favorable for the direct methanol fuel cells.

中文翻译：

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具有优异甲醇电氧化性能的MCM-41介孔二氧化硅纳米粒子负载二氧化钛-银纳米复合材料的合成

考虑到燃料电池的重要性，我们通过使用天然合成的物质 41 号（MCM-41）介孔二氧化硅纳米颗粒以及银和二氧化钛制造电极，开发了一种用于甲醇电催化氧化的合适且有效的电极系统纳米粒子。从天然茎秆中提取的二氧化硅用于合成 MCM-41 介孔二氧化硅纳米颗粒，并通过不同的技术对产物进行表征。然后，合成的 MCM-41 介孔二氧化硅被银和二氧化钛纳米粒子改性，并用于制备改性碳糊电极（Ag/TiO ₂/MCM-41/CPE)，因此用于甲醇的电催化氧化。基于循环伏安法和计时电流法技术彻底检查了反应的机械和动力学研究。结果表明，在 MCM-41 介孔二氧化硅上负载银和二氧化钛纳米颗粒的改性碳糊电极比裸碳糊电极表现出更高的电流密度和更低的过电位。然后将甲醇电催化氧化的结果与文献进行比较，表明所开发的系统有利于直接甲醇燃料电池。