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首页> 外文期刊>Electrocatalysis >Ethylene Glycol Oxidation at Pt/TiO2/Carbon Hybrid Catalysts Modified Glassy Carbon Electrodes in Alkaline Media
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Ethylene Glycol Oxidation at Pt/TiO2/Carbon Hybrid Catalysts Modified Glassy Carbon Electrodes in Alkaline Media

机译：碱性介质中Pt / TiO2 /碳杂化催化剂修饰玻碳电极上的乙二醇氧化

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Biomass-based fuels in conjunction with direct alcohol alkaline fuel cells are an emerging technology that may be able to wean us of our dependency of fossil fuels. However, their adoption is stalled by their high production costs (i.e., precious metal loading) and low electrocatalytic efficiencies. In this study, the platinum loading of 20 % Pt/C catalyst for use in ethylene glycol electrooxidation was reduced by mixing with TiO2 nanopowder in different mass ratios. This was followed by surface activation and cyclic voltammograms of the hydrogen adsorption and Pt oxide potential regions in 0.1 M KOH showed peak potential changes that are attributed to platinum interactions with TiO2. The catalysts were further tested for the electrochemical oxidation of ethylene glycol in alkaline media, where the titanium-modified catalysts showed a maximum increase in peak current density by 91 %, when compared to the commercial Pt/C catalyst. When the peak current was normalized by Pt surface area and mass, a maximum increase of 322 % was found. Tafel plot analysis showed increased exchange currents for the rate determining step of ethylene glycol oxidation at Pt/TiO2/C hybrid catalysts up to 7.35 x 10~(-7)A/cm~2. This is nearly 8.7 times larger than, 8.47 x 10~(-8)A/cm~2, the ethylene glycol exchange current density for the rate determining step in commercial Pt/C catalysts. Finally, chronoamperometric studies showed that the hybrid catalysts possessed increased stability and activity for ethylene glycol electrooxidation in 0.1 M ethylene glycol in 0.1 M KOH at an applied potential of -0.350 V vs. Ag/AgCl. This study shows that TiO2 can modify the platinum surface catalyst activity without the need of a TiO2 support. This avoids loss in electrical conductivity of the catalyst and lowers the total catalyst mass without sacrificing catalytic mass activity.
机译：基于生物质的燃料与直接酒精碱性燃料电池相结合是一项新兴技术，可能使我们摆脱对化石燃料的依赖。然而，由于其高生产成本（即，贵金属装载量）和低电催化效率而使它们的采用受到阻碍。在这项研究中，通过以不同的质量比混合TiO2纳米粉，降低了乙二醇电氧化中20％Pt / C催化剂的铂负载量。随后进行表面活化，氢吸附和0.1 M KOH中的Pt氧化物电势区域的循环伏安图显示，峰值电势变化归因于铂与TiO2的相互作用。进一步测试了催化剂在碱性介质中对乙二醇的电化学氧化作用，与商用Pt / C催化剂相比，钛改性催化剂的峰值电流密度增加了91％。当峰值电流通过Pt表面积和质量归一化时，最大增加为322％。 Tafel图分析显示，用于Pt / TiO2 / C杂化催化剂的乙二醇氧化速率测定步骤的交换电流增加至7.35 x 10〜（-7）A / cm〜2。这比用于工业Pt / C催化剂中速率确定步骤的乙二醇交换电流密度8.47 x 10〜（-8）A / cm〜2大了近8.7倍。最后，计时电流法研究表明，在相对于Ag / AgCl的施加电势为-0.350 V的条件下，在0.1 M KOH中的0.1 M乙二醇中，杂化催化剂具有更高的稳定性和乙二醇电氧化活性。这项研究表明，TiO2可以改变铂表面催化剂的活性，而无需TiO2载体。这避免了催化剂电导率的损失，并且在不牺牲催化质量活性的情况下降低了总催化剂质量。

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