Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media,ChemElectroChem

当前位置： X-MOL 学术 › ChemElectroChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Electrocatalytic Oxidation of Glycerol on Platinum Single Crystals in Alkaline Media
ChemElectroChem ( IF 3.5 ) Pub Date : 2019-04-05 , DOI: 10.1002/celc.201900311
Regiani M. L. M. Sandrini ₁ , Juliane R. Sempionatto ₂ , Germano Tremiliosi‐Filho ₃ , Enrique Herrero ₄ , Juan M. Feliu ₄ , Janaina Souza‐Garcia ₁ , Camilo A. Angelucci ₁

Affiliation

Glycerol adsorption and oxidation reactivity at platinum single crystal electrodes in alkaline media using electrochemical and Fourier transform infrared (FTIR) techniques are reported. The behavior of Pt(100) and Pt(110) for the glycerol electrooxidation reaction (GEOR) were compared and analyzed altogether with those previously reported for Pt(111) ( R. M. L. M. Sandrini, J. R. Sempionatto, E. Herrero, J. M. Feliu, J. Souza‐Garcia, C. A. Angelucci, Electrochem. commun. 2018, 86, 149–152). The voltammetric profiles confirm the structure sensitivity of GEOR as well as the role of the surface atoms orientation on the electrocatalytic activity. The Pt(100) surface has shown to be less prone to poisoning during multiple potential cycles in contrast to Pt(110), which suffers an accentuate deactivation at the first positive‐going scan. Spectroscopic results show that the GEOR on all three surfaces is characterized by the presence of two broad bands, centered at circa 1400 cm⁻¹ and 1600 cm⁻¹. This provides evidence that the GEOR mechanism undergoes glycerol dehydrogenation to alkoxydes followed by the formation of aldehyde intermediates adsorbed as η¹(O)‐aldehyde and η¹(C)‐acyl geometry, respectively. The surface atomic arrangement induces different selectivity in the oxidation process.

中文翻译：

碱性介质中铂单晶上甘油的电催化氧化

据报道，使用电化学和傅立叶变换红外（FTIR）技术在碱性介质中铂单晶电极上甘油的吸附和氧化反应性。将Pt（100）和Pt（110）的甘油电氧化反应（GEOR）行为与先前报道的Pt（111）行为进行了比较和分析（RMLM Sandrini，JR Sempionatto，E.Herrero，JM Feliu，J. Souza-Garcia，CA Angelucci，Electrochem.commun . 2018年，86，149–152）。伏安曲线证实了GEOR的结构敏感性以及表面原子取向对电催化活性的作用。与Pt（110）相比，Pt（100）表面在多个潜在周期内不容易中毒，而Pt（110）在第一次进行正扫描时会严重失活。光谱结果表明，在所有三个表面上的GEOR特征在于存在两个宽带，其集中在大约1400 cm ^-1和1600 cm ^-1处。这提供证据表明，GEOR机构经历甘油脱氢alkoxydes随后醛中间体的吸附为η形成¹（O） -醛和η ¹（C）-酰基的几何形状。表面原子排列在氧化过程中引起不同的选择性。

更新日期：2019-04-05

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南