Adsorption Structure of Protonated Melamine on Single Crystal Pt Surfaces.

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-07-24 DOI:10.1021/acs.langmuir.5c01815

Haruki Shimada,Yuto Ito,Yuto Hanaoka,Nagahiro Hoshi,Masashi Nakamura

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Abstract

Pt electrodes modified with melamine significantly activates the oxygen reduction reaction (ORR). A comprehensive understanding of the activation mechanism by melamine is essential for the identification of organic additives that can further activate the ORR. Herein, we investigated the coadsorption structure of water with melamine on single-crystal Pt surfaces using Infrared spectroscopy under ultrahigh vacuum conditions. Protonated melamine was dosed on the Pt surfaces using the electrospray method to model the adsorption structure under acidic conditions. The orientation of the adsorbed melamine depends on the atomic arrangement of the Pt substrate as well as the coexistence of water. The melamine-modified Pt electrode obtained by the electrospray method was transferred to an electrochemical cell, and its ORR activity was evaluated. The kinetic current density of the ORR on the transferred Pt was comparable to that obtained by the conventional wetting modification method. This result indicates that the adsorption structure of melamine prepared by the electrospray method is similar to that obtained by the wetting modification.

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质子化三聚氰胺在单晶Pt表面的吸附结构。

三聚氰胺修饰Pt电极可显著激活氧还原反应（ORR）。全面了解三聚氰胺的激活机制对于确定能够进一步激活ORR的有机添加剂至关重要。在超高真空条件下，利用红外光谱研究了水与三聚氰胺在单晶铂表面的共吸附结构。采用电喷雾法将质子化三聚氰胺加在Pt表面，模拟了酸性条件下三聚氰胺的吸附结构。吸附三聚氰胺的取向取决于Pt衬底的原子排列以及水的共存。将电喷雾法制备的三聚氰胺修饰Pt电极转移到电化学电池中，并对其ORR活性进行了评价。在转移的Pt上，ORR的动态电流密度与传统的润湿改性方法相当。结果表明，电喷雾法制备的三聚氰胺吸附结构与润湿改性法制备的三聚氰胺吸附结构相似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).