Effect of Sintering Temperature on Adhesion Property and Electrochemical Activity of Pt/YSZ Electrode

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL Materials Pub Date : 2022-05-01 DOI:10.3390/ma15103471

Jixin Wang, J. Cui, X. Zhang, Wentao Tang, C. Mao

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Abstract

The (Pt/YSZ)/YSZ sensor unit is the basic component of the NOx sensor, which can detect the emission of nitrogen oxides in exhaust fumes and optimize the fuel combustion process. In this work, the effect of sintering temperature on adhesion property and electrochemical activity of Pt/YSZ electrode was investigated. Pt/YSZ electrodes were prepared at different sintering temperatures. The microstructure of the Pt/YSZ electrodes, as well as the interface between Pt/YSZ electrode and YSZ electrolyte, were observed by SEM. Chronoamperometry, linear scan voltammetry, and AC impedance were tested by the electrochemical workstation. The results show that increasing the sintering temperature (≤1500 °C) helped to improve adhesion property and electrochemical activity of the Pt/YSZ electrode, which benefited from the formation of the porous structure of the Pt/YSZ electrode. For the (Pt/YSZ) electrode/YSZ electrolyte system, O2− in YSZ is converted into chemisorbed O2 on Pt/YSZ, which is desorbed into the gas phase in the form of molecular oxygen; this process could be the rate-controlling step of the anodic reaction. Increasing the sintering temperature (≤1500 °C) could reduce the reaction activation energy of the Pt/YSZ electrode. The activation energy reaches the minimum value (1.02 eV) when the sintering temperature is 1500 °C.

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烧结温度对Pt/YSZ电极粘附性能和电化学活性的影响

(Pt/YSZ)/YSZ传感器单元是NOx传感器的基础部件，可以检测尾气中氮氧化物的排放情况，优化燃料燃烧过程。本文研究了烧结温度对Pt/YSZ电极粘附性能和电化学活性的影响。在不同的烧结温度下制备了Pt/YSZ电极。通过扫描电镜观察了Pt/YSZ电极的微观结构以及Pt/YSZ电极与YSZ电解液的界面。在电化学工作站进行了计时安培法、线性扫描伏安法和交流阻抗测试。结果表明:提高烧结温度(≤1500℃)有助于提高Pt/YSZ电极的粘附性能和电化学活性，这得益于Pt/YSZ电极多孔结构的形成;对于(Pt/YSZ)电极/YSZ电解质体系，YSZ中的O2−转化为Pt/YSZ上化学吸附的O2，并以分子氧的形式解吸到气相中;这一过程可能是阳极反应的速率控制步骤。提高烧结温度(≤1500℃)可以降低Pt/YSZ电极的反应活化能。当烧结温度为1500℃时，活化能达到最小值(1.02 eV)。

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

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.