Pt3Sn /石墨烯催化剂用于乙醇氧化反应的原位快速X射线吸收光谱研究,ChemCatChem

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Pt3Sn /石墨烯催化剂用于乙醇氧化反应的原位快速X射线吸收光谱研究
ChemCatChem ( IF 3.8 ) Pub Date : 2020-10-17 , DOI: 10.1002/cctc.202001400
Bing‐Jian Su, Kuan‐Wen Wang, Chung‐Jen Tseng, Kueih‐Tzu Lu, Chih‐Wen Pao, Jyh‐Fu Lee, Hwo‐Shuenn Sheu, Kuang‐Hsu Wu, Jenh‐Yih Juang, Jin‐Ming Chen

直接乙醇燃料电池（DEFC）承诺将乙醇用作通过乙醇氧化反应（EOR）进行能量转换的生物可再生且无毒的燃料。测试了用醇还原法制备的石墨烯上分散良好的Pt ₃ Sn和Pt纳米粒子（分别表示为Pt ₃ Sn / G和Pt / G）对EOR的支持。HRTEM和XRD表征提供了Pt ₃的形态和晶相具有2.8±0.08nm的均匀粒径的Sn合金纳米颗粒，与作为参考的Pt / G催化剂一致。根据在EV测试的CV阳极扫描过程中的原位快速X射线吸收近边缘结构（QXANES）光谱，以清楚地解释所制备电催化剂的电势依赖电子状态，其白线强度为Pt L ₃边缘QXANES光谱及其光谱曲线随电极电压而明显变化。此外，Pt ₃ Sn / G显示出比Pt / G更好的EOR性能，因为SnO ₂通过适当扩展PtSn合金中的晶格参数，可以改善氧化过程中的吸附和离解。这项工作提供了深入了解乙醇在合金化的Pt表面上解离吸附的反应机理，这对于增强EOR活性以完成乙醇完全氧化具有重要作用。

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An In Situ Quick X‐ray Absorption Spectroscopy Study on Pt3Sn/Graphene Catalyst for Ethanol Oxidation Reaction

Direct ethanol fuel cells (DEFCs) promise the use of ethanol as a bio‐renewable and non‐toxic fuel for energy conversion through the ethanol oxidation reaction (EOR). Well dispersed Pt₃Sn and Pt nanoparticles on graphene (denoted Pt₃Sn/G and Pt/G) support electrocatalysts made with alcohol reduction were tested towards EOR. The HRTEM and XRD characterizations provide the morphology and crystal phase of the Pt₃Sn alloy nanoparticles, which has a uniform particle size of 2.8±0.08 nm, as is consistent with a Pt/G catalyst as reference. According to the in‐situ quick X‐ray‐absorption near‐edge structure (QXANES) spectra during an anodic scan of CV for the EOR test to explain clearly the potential‐dependent electronic state of the prepared electrocatalysts, the white‐line intensities of the Pt L₃‐edge QXANES spectra and their spectral profiles vary appreciably with the electrode voltage. Moreover, Pt₃Sn/G shows a better EOR performance than Pt/G because SnO₂ can improve adsorption and dissociation during the oxidation by an appropriate expansion of the lattice parameters in the PtSn alloy. This work provides insight into the reaction mechanism of dissociative adsorption of ethanol on alloyed Pt surface, which has an important role in enhancing the EOR activity for a complete ethanol oxidation.

更新日期：2020-10-17

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