Pt nanoparticles (PtNPs) were deposited on two different supports: Vulcan^® XC-72R carbon (PV) and TiO₂/G-PV, a TiO₂/carbon composite support prepared using glucose-doped Vulcan^® XC-72R carbon (G-PV). The presence of TiO₂ has been shown to maximize the PtNPs specific surface area and improves the catalytic performance through Pt-metal oxide interaction. The catalytic activity of Pt/TiO₂/G-PV and Pt/PV toward the methanol oxidation reaction (MOR) was investigated with and without ultraviolet-visible (UV–vis) light irradiation using different electrochemical techniques. The results show the enhancement in catalytic activity in Pt/PV under illumination (I_peak ^illumination-I_peak ^dark)*100/I_peak ^dark ∼100%) can be attributed to a significant reduction in the charge transfer resistance (Rct) when the electrode is illuminated (635Ω (dark) vs 84Ω (illumination)) as determined by electrochemical impedance spectroscopy (EIS). The observed photo enhancement is relatively modest when compared to the Pt/TiO₂/G-PV catalyst (I_peak ^illumination-I_peak ^dark)*100/I_peak ^dark ∼171%), even though the change in the Rct (185Ω vs. 99Ω) is not as pronounced as in the Pt/PV samples. The carbon monoxide (CO) stripping results indicate that illumination aids the removal of adsorbed CO from the PtNPs surface. The remarkable enhancement on the oxidation of methanol under UV–vis illumination in the case of the Pt/TiO₂/G-PV catalyst materials show the potential of these materials for applications such as disposable and portable electrochemical sensors for water analysis, mainly the determination of organic contaminants in water. Moreover, it can be a breakthrough in the development of novel photoelectrochemical ethanol sensors and a new generation of energy conversion devices.

中文翻译：

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光增强的甲醇电氧化：对Pt和TiO2纳米颗粒贡献的进一步了解

的Pt纳米颗粒（PtNPs）沉积在两个不同的载体：火神^® XC-72R炭（PV）和TiO ₂ / G-PV，一个的TiO ₂ /碳复合支持使用葡萄糖掺杂火神制备^® XC-72R炭（G- PV）。TiO ₂的存在已被证明可以使PtNPs的比表面积最大化，并通过Pt-金属氧化物的相互作用提高催化性能。使用不同的电化学技术，在有无紫外可见光照射下，研究了Pt / TiO ₂ / G-PV和Pt / PV对甲醇氧化反应（MOR）的催化活性。结果表明在光照下Pt / PV的催化活性增强（I_峰 ^照度-I_峰值 ^暗）* 100 / I_峰值 ^暗〜100％）可以归因于当电极被照亮时（635Ω（暗）vs84Ω（照度））时电荷转移电阻（Rct）的显着降低，由下式确定电化学阻抗谱（EIS）。与Pt / TiO ₂ / G-PV催化剂相比，观察到的光增强相对中等（I_峰值 ^照度-I_峰值 ^暗）* 100 / I_峰值 ^暗即使Rct的变化（185Ω对99Ω）不如Pt / PV样品明显，约为171％）。一氧化碳（CO）汽提结果表明，照明有助于从PtNPs表面去除吸附的CO。在Pt / TiO ₂ / G-PV催化剂材料的情况下，在紫外可见照明下甲醇氧化的显着增强显示了这些材料在诸如一次性和便携式用于水分析的电化学传感器等应用中的潜力，主要用于测定水中的有机污染物。此外，在新型光电化学乙醇传感器和新一代能量转换装置的开发中，这可能是一项突破。