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First Assessments of the Influence of Oxygen Reduction on the Glycerol Electrooxidation Reaction on Pt

机译：第一次评估氧还原对甘油电氧化反应对PT的影响

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The electroactivity of new nanomaterials candidates to be used as anodes for glycerol fuel cells or electrolysers has been largely investigated, but most of the literature reports the use of O-2-free solutions. However, the purging process to extract O-2 from glycerol solution and the storage at similar condition is costly. Moreover, the lack of knowledge on the glycerol electrooxidation reaction (GEOR) in the presence of O-2 prevents alternative applications, as that in single channel microfluidic fuel cells, when the anode must be selective for the alcohol oxidation in the presence of O-2. Herein, we accessed the influence of the oxygen reduction reaction on the GEOR by using aflow system with an electrode in wall-jet configuration. The GEOR is investigated on Pt/C nanoparticles (NPs) in the presence of different amounts of O-2 in solution as a proof of concept. We also used synthesized Pt@Au to apply the method for a new material candidate to be used as catalyst in glycerol technologies. The presence of oxygen in solution barely influences GEOR on Pt/C or Pt@Auwhenever classic stationary measurements are used. We found comparable electrocatalytic parameters and the same carbonyl products, but at slightly different proportions, in the presence or absence of O-2 after long-time electrolysis followed by chromatographic analysis. On the other hand, oxygen competes with glycerol by the active sites when the reactants are convectively forced towards the electrode surface, at flow configuration. The competition between GEOR and oxygen reduction results in a net cathodic current density when using O-2-saturated glycerol solution at potentials suitable for the reduction reaction on Pt/C. Pt@Au shows remarkable activity for the oxygen reduction, producing high cathodic currents even in air-saturated glycerol solution. Moreover, the presence of O-2 greatly decreases the stability of Pt@Au during GEOR, mainly due to the improved oxygen reduction and extended surface accessed by O-2, while same material controversially displayed good stability in N-2-saturated solution. The use of flow configuration shed a light on the influence of O-2 on GEOR, providing new information non-accessible by other classic stationary methods.
机译：在很大程度上研究了新的纳米材料候选物作为甘油燃料电池或电解液的阳极的候选物的电切性，但大多数文献报告使用O-2无溶液。然而，从甘油溶液中提取O-2的吹扫过程和类似条件下的储存是昂贵的。此外，在O-2存在下缺乏对甘油电氧化反应（Geor）的知识可防止替代应用，如在单通道微流体燃料电池中，当阳极在O-存在下为醇氧化时选择性。 2。在此，我们通过使用壁射流构造的电极的AFLOW系统访问氧还原反应的影响。在Pt / C纳米颗粒（NPS）上在溶液中的不同量O-2存在下研究Geor，作为概念证据。我们还使用合成的Pt @ Au来应用用于在甘油技术中用作催化剂的新材料候选物的方法。溶液中氧的存在几乎影响了使用Pt / C或Pt @ Auwhen静止测量的Geor。我们发现可比较的电催化参数和相同的羰基产物，但在长时间电解后的O-2存在下，在存在或不存在下略有不同的比例，然后是色谱分析。另一方面，当反应物在流动构型时，当反应物被定性地被反应地朝向电极表面被定性地迫使电极表面时，氧气与甘油竞争。当在适用于PT / C上还原反应的电位下使用O-2饱和甘油溶液时，Geor和氧还原之间的竞争导致净阴极电流密度。 Pt @ au表示氧还原的显着活动，即使在空气饱和甘油溶液中也产生高阴极电流。此外，O-2的存在大大降低了Geor期间Pt @ Au的稳定性，主要是由于O-2访问的改善的氧还原和延伸表面，而相同的材料在N-2饱和溶液中具有良好的稳定性。流动配置流揭示了O-2对Geor的影响，提供了其他经典静止方法不可访问的新信息。

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