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Improved Pt/CeO2 Electrocatalysts for Ethanol Electro-oxidation

机译：改进的Pt / CeO 2 电催化剂用于乙醇电氧化

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摘要

A simple and low-cost approach for the preparation of wide-gap (Eg = 3.43 eV), fine cerium dioxide crystals(CeO2, d = 8.1 nm), was developed in order to support Pt nanoparticles as electrocatalysts for ethanoloxidation. Cerium oxide powders were prepared by precipitation from cerium chloride solution in ammoniamedium and the influence of calcination temperature was evaluated. Platinum nanoparticles wereincorporated by a wet chemical reduction of chloroplatinic acid with sodium borohydrate. Compared to astate-of-the-art Pt/C, the nanocomposite exhibited a much higher mass activity (2.5×) and significant antipoisoning ability. The promotional effect of the CeO2 nanocrystals was discovered to be affected by heattreatment conditions. Compared to oven-dried samples, calcination allows to (i) an enhanced metal–supportinteraction between CeO2 and Pt and (ii) an enhancement of electron transportation to catalyst owing to theshrinkage of CeO2 bandgap, thereby promoting the oxidation of the strongly adsorbed CxHy. Therefore, thePt/CeO2 nanocomposite appears to be a promising electrocatalyst for advanced energy conversion.
机译：为了支持Pt纳米颗粒作为乙醇氧化的电催化剂，开发了一种简单且低成本的方法来制备宽间隙（Eg = 3.43 eV）的二氧化铈细晶体（CeO2，d = 8.1 nm）。通过从氯化铈在氨水中的溶液中沉淀来制备氧化铈粉末，并评估了煅烧温度的影响。通过用硼氢化钠湿化学还原氯铂酸并入铂纳米颗粒。与最新的Pt / C相比，纳米复合材料具有更高的质量活性（2.5倍）和显着的抗毒能力。发现CeO2纳米晶体的促进作用受热处理条件的影响。与烘箱干燥的样品相比，煅烧可以（i）增强CeO2和Pt之间的金属-载体相互作用，以及（ii）由于CeO2带隙的缩小，可以促进电子向催化剂的传输，从而促进强吸附的CxHy的氧化。因此，Pt / CeO2纳米复合材料似乎是用于高级能量转换的有前途的电催化剂。

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