RoDSE Synthesized Fine Tailored Au Nanoparticles from Au(X) 4 – (X = Cl – , Br – , and OH – ) on Unsupported Vulcan XC-72R for Ethanol Oxidation Reaction in Alkaline Media
RoDSE Synthesized Fine Tailored Au Nanoparticles from Au(X) 4 – (X = Cl – , Br – , and OH – ) on Unsupported Vulcan XC-72R for Ethanol Oxidation Reaction in Alkaline Media
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RoDSE 在无支撑 Vulcan XC-72R 上使用 Au(X) 4 –（X = Cl –、Br – 和 OH –）合成精细定制的 Au 纳米颗粒，用于碱性介质中的乙醇氧化反应
DOI：
10.1021/acsaem.8b01284
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发表时间：
2018
影响因子：
6.4
通讯作者：
Cabrera, Carlos R.
中科院分区：
文献类型：
--
作者：
Betancourt, Luis E.;Ortiz-Rodríguez, Ángel M.;Corchado-García, Juan;Cabrera, Carlos R.
使用AuX 4-（X = Cl-、Br-和OH-）作为分子前体和不同的电解质介质，进行电合成方法，获得分散在碳Vulcan XC-72 R载体材料上的Au纳米颗粒。Au表面结构显着增强使用KOH作为电解质，而不是KBr和H2SO 4。循环伏安法被用作表面敏感技术来说明Au/Vulcan XC-72 R对乙醇氧化反应（EOR）的催化活性。在Au/C-H_2SO_4、Au/C-KBr和Au/C-KOH体系中，得到的Au电活性表面积分别为1.88、5.83和13.96 m2 g-1。后者相比，化学还原的Au/C球，具有15.0 m2 g-1的电活性表面积。在碱性介质（Au/C-KOH）中，电化学沉积Au的催化活性最高，其峰值电流密度比化学还原法制备的Au纳米粒子提高了50%。对Au/Vulcan XC-72 R纳米材料的拉曼和X射线光电子能谱分析揭示了负责金属纳米颗粒锚定的碳官能团的重组。我们的结果强烈表明，增强的EOR催化活性与碳表面上氧官能团的存在有关，特别是碳Vulcan XC-72 R基底上的酮基。
An electrosynthesis method to obtain Au nanoparticles dispersed on carbon Vulcan XC-72R support material was done using AuX4–(X = Cl–, Br–, and OH–) as molecular precursors and different electrolyte media. The Au surface structure was significantly enhanced using KOH as an electrolyte as opposed to KBr and H2SO4. Cyclic voltammetry was used as a surface sensitive technique to illustrate the Au/Vulcan XC-72R catalytic activity for the ethanol oxidation reaction (EOR). The Au electroactive surface areas obtained were 1.88, 5.83, and 13.96 m2g–1for Au/C–H2SO4, Au/C–KBr, and Au/C–KOH, respectively. The latter compares to chemically reduced Au/C–spheres that had an electroactive surface area of 15.0 m2g–1. The electrochemical Au electrodeposition, in alkaline media (Au/C–KOH), exhibited the highest catalytic activity for the EOR with a 50% increase in peak current density when compared with Au nanoparticles prepared by the chemical reduction route. Raman and X-ray photoelectron spectroscopies analyses of the Au/Vulcan XC-72R nanomaterials revealed a restructuring of the carbon functionalities responsible for the metal nanoparticle anchoring. Our results strongly suggest that the enhanced EOR catalytic activity is related to the presence of oxygen functional groups on the carbon surface, particularly ketonic groups on the carbon Vulcan XC-72R substrate.