Thin-Film Potentiometric Sensor to Detect CO2 Concentrations Ranging Between 2 % and 100 %,Electroanalysis

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Thin-Film Potentiometric Sensor to Detect CO2 Concentrations Ranging Between 2 % and 100 %
Electroanalysis ( IF 2.7 ) Pub Date : 2017-07-19 , DOI: 10.1002/elan.201700304
Lander Rojo ₁ , Irene Castro-Hurtado ₁ , Gemma G. Mandayo ₁ , Enrique Castaño ₁ , Maria C. Morant-Miñana ₂

Affiliation

A potentiometric thin-film sensor to detect CO2 in a wide range (2–100 %) has been developed. The system has been fabricated depositing a reference electrode of Pt, a solid electrolyte of YSZ (Yttria-stabilized Zirconia), a sensing phase made of Li2CO3 and a working electrode of Au via Physical Vapor Deposition (PVD). Characterization of the different elements has provided the optimal fabrication parameters and the system response for CO2 concentrations can be measured from 2 to 100 % at 450 °C. The sensor behaves as a non-Nerstian system and slightly deviates from a linear response with the logarithm of CO2 until the CO2 concentration reaches the 30 %. Higher CO2 amounts make the response divert more from the Nernst law but give a stable and reproducible response to CO2 in a wide range of concentrations. Based on these promising results the recovery time, stability, repeatability and selectivity of the sensor have been measured. The performance showed by the thin film sensor proves the feasibility of the use of this system for biogas and natural gas applications owing to its very good consistency at low temperature in a wide concentration range.

中文翻译：

薄膜电位传感器，可检测 2% 到 100% 之间的 CO2 浓度

已开发出一种用于检测大范围 (2–100%) 二氧化碳的电位计薄膜传感器。该系统已通过物理气相沉积 (PVD) 沉积 Pt 参比电极、YSZ（氧化钇稳定氧化锆）固体电解质、Li2CO3 传感相和 Au 工作电极制成。不同元素的表征提供了最佳制造参数，并且可以在 450 °C 下测量 CO2 浓度的系统响应范围为 2% 至 100%。传感器表现为非 Nerstian 系统，在 CO2 浓度达到 30% 之前，会略微偏离与 CO2 对数的线性响应。较高的 CO2 量会使响应更偏离能斯特定律，但在较宽的浓度范围内对 CO2 给出稳定且可重现的响应。基于这些有希望的结果，已经测量了传感器的恢复时间、稳定性、可重复性和选择性。薄膜传感器表现出的性能证明了将该系统用于沼气和天然气应用的可行性，因为它在低温下在很宽的浓度范围内具有非常好的一致性。

更新日期：2017-07-19

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