Electrochemical Activity of Carbon-Supported Pt-Nanoparticles: Effect of Pt-Precursor Ligand and/or Presence of Anions During Polyol Synthesis

IF 2.7 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2023-11-30 DOI:10.1007/s12678-023-00856-5

Kristian Juul Omann, Raghunandan Sharma, Shuang Ma Andersen

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Abstract

This study revisits the impacts of the presence of OH⁻ and Cl⁻ anions and/or different forms of Pt precursors during polyol synthesis of carbon-supported electrocatalysts. Efficiency of the synthesis process in terms of the %conversion of a Pt complex to Pt metal has been quantified. It is observed that Pt precursors based on [PtCl₆]²⁻ are reduced easily compared to those based on [Pt(OH)₆]²⁻. Furthermore, presence of excess Cl⁻ during synthesis results in decreased %conversion and reduced ECSA, which is opposite from other reported work synthesized at higher temperature and pure solvents. For Pt/C synthesis under mild conditions, 100 °C and 30 vol% EG in water as solvent, presence of OH⁻ during synthesis decreases the ECSA and hence increases the Pt nanoparticle size and change of catalyst surface structure. Finally, a method to get insights into the surface structure of Pt-nanoparticles through analysis of the H-adsorption/H-desorption peaks has been proposed.

Graphical Abstract

Abstract Image

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碳负载的pt纳米颗粒的电化学活性:pt前体配体和/或阴离子在多元醇合成过程中的影响

本研究回顾了OH -和Cl -阴离子的存在和/或不同形式的Pt前体在碳负载电催化剂多元醇合成过程中的影响。以Pt配合物转化为Pt金属的百分比来量化合成过程的效率。与基于[Pt(OH)6]2−的铂前驱体相比，基于[PtCl6]2−的铂前驱体更容易还原。此外，合成过程中过量Cl−的存在导致转化率降低和ECSA降低，这与其他在高温和纯溶剂下合成的研究相反。在较温和的条件下，以100°C和30 vol% EG为溶剂，合成Pt/C时，OH -的存在降低了ECSA，从而增加了Pt纳米颗粒的尺寸和催化剂表面结构的变化。最后，提出了一种通过分析h -吸附/ h -解吸峰来深入了解pt纳米颗粒表面结构的方法。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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