ABSTRACT The modification of various carbons with various metal oxides and noble metal composites was performed to prepare electrocatalysts, and the catalysts were further investigated for ethanol electro-oxidation. The catalyst activity and stability were studied by cyclic voltammetry (CV) and chronoamperometry (CA), respectively. First, various metal oxides (e.g., TiO2, CeO2 and MnO2) were prepared on a graphene oxide (GO) support. Pt on TiO2 with a GO support (Pt/TiO2-GO) provided a higher current density and long-term stability than the other catalysts. Second, TiO2 was prepared on various carbons (e.g., graphite (G), graphite oxide (GTO), GO and polydopamine (PDA)-modified GO (PDA-GO)), and the corresponding electrocatalytic activities were determined. Pt/TiO2-PDA-GO showed the highest activity and stability for oxidation. Consequently, TiO2-PDA-GO was chosen as a support for further studies on the optimal composition of bimetallic catalysts (xPtyPd/TiO2-PDA-GO). 4Pt2Pd/TiO2-PDA-GO showed the highest performance for ethanol oxidation. The prepared M/TiO2-C catalysts were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The results showed that the dispersed nanoparticles were loaded on the modified carbon supports. From electrochemical measurements, the prepared electrocatalysts showed improved electrocatalytic activities in terms of low onset potential and high current density and stability.

中文翻译：

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用各种金属氧化物和贵金属组合物修饰各种碳作为乙醇氧化的电催化剂

摘要 用各种金属氧化物和贵金属复合物对各种碳进行改性制备电催化剂，并进一步研究了该催化剂用于乙醇电氧化。分别通过循环伏安法（CV）和计时电流法（CA）研究了催化剂的活性和稳定性。首先，在氧化石墨烯(GO) 载体上制备各种金属氧化物(例如TiO2、CeO2 和MnO2)。带有 GO 载体的 TiO2 上的铂 (Pt/TiO2-GO) 提供了比其他催化剂更高的电流密度和长期稳定性。其次，在各种碳（例如石墨（G）、氧化石墨（GTO）、GO 和聚多巴胺（PDA）修饰的 GO（PDA-GO））上制备了 TiO2，并确定了相应的电催化活性。Pt/TiO2-PDA-GO 显示出最高的氧化活性和稳定性。最后，选择 TiO2-PDA-GO 作为进一步研究双金属催化剂 (xPtyPd/TiO2-PDA-GO) 最佳组成的支持。4Pt2Pd/TiO2-PDA-GO 表现出最高的乙醇氧化性能。通过扫描电子显微镜(SEM)、能量色散X射线光谱(EDS)和透射电子显微镜(TEM)对制备的M/TiO2-C催化剂进行表征。结果表明分散的纳米颗粒负载在改性碳载体上。从电化学测量来看，所制备的电催化剂在低起始电位和高电流密度和稳定性方面显示出改进的电催化活性。通过扫描电子显微镜(SEM)、能量色散X射线光谱(EDS)和透射电子显微镜(TEM)对制备的M/TiO2-C催化剂进行表征。结果表明分散的纳米颗粒负载在改性碳载体上。从电化学测量来看，所制备的电催化剂在低起始电位和高电流密度和稳定性方面显示出改进的电催化活性。通过扫描电子显微镜(SEM)、能量色散X射线光谱(EDS)和透射电子显微镜(TEM)对制备的M/TiO2-C催化剂进行表征。结果表明分散的纳米颗粒负载在改性碳载体上。从电化学测量来看，所制备的电催化剂在低起始电位和高电流密度和稳定性方面显示出改进的电催化活性。