High performance 20% Pt-CeOx (1:1 Pt:Ce weight ratio) electrocatalyst dispersed on Multiwalled Carbon Nanotubes (MWCNTs) was synthesized under H2 atmosphere at 300 °C. The average particle size determined from XRD was ca. 1.7 and 10 nm for Ce and Pt, respectively. HRTEM analysis confirmed the presence of particle sizes within this range, although it was not possible to distinguish Ce from Pt nanoparticles. The XPS spectrum of Ce showed characteristics that indicate the existence of both oxidized and reduced phases (i.e., Ce2O3 and CeO2). It is suggested that the presence of the C3+ state establishes the capacity of this material to act as a tolerant cathode. The spectrum of Pt confirmed the presence of Pt metal. The 20% Pt-CeOx/MWCNT cathode showed high electroactivity for the Oxygen Reduction Reaction (ORR). Moreover, this novel material presented a high degree of tolerance to ethanol. During polarization tests in ethanol-containing solution, the Pt-CeOx/MWCNT cathode showed no peak current density due to the ethanol oxidation reaction (EOR) and the onset potential for the ORR shifted by only 80 mV towards more negative potentials. Thus, the presence of ceria clearly enhanced the electrochemical tolerance of the Pt-based cathode to ethanol.

中文翻译：

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Pt-CeOx / MWCNT电催化剂作为耐醇的直接酒精燃料电池的ORR阴极

在H2气氛和300°C的条件下，合成了分散在多壁碳纳米管（MWCNTs）上的高性能20％Pt-CeOx（1：1 Pt：Ce重量比）电催化剂。由XRD确定的平均粒度为约。Ce和Pt分别为1.7和10 nm。HRTEM分析证实存在该范围内的粒径，尽管不可能将Ce与Pt纳米粒子区分开。Ce的XPS光谱显示出表明存在氧化相和还原相（即Ce2O3和CeO2）的特征。有人认为，C3 +态的存在建立了这种材料作为耐性阴极的能力。Pt的光谱证实了Pt金属的存在。20％Pt-CeOx / MWCNT阴极对氧还原反应（ORR）表现出高电活性。而且，这种新颖的材料对乙醇具有高度的耐受性。在含乙醇的溶液中进行极化测试期间，由于乙醇氧化反应（EOR），Pt-CeOx / MWCNT阴极未显示峰值电流密度，并且ORR的起始电势仅向更负的电势偏移了80 mV。因此，二氧化铈的存在明显提高了基于Pt的阴极对乙醇的电化学耐受性。