Sedlak Petr, Kaspar Pavel, Sobola Dinara, Gajdos Adam, Majzner Jiri, Sedlakova Vlasta, Kubersky Petr
Department of Physics, Faculty of Electrical Engineering and Communications, Brno University of Technology, Technicka 10, 616 00 Brno, Czech Republic.
Research and Innovation Centre for Electrical Engineering (RICE), Faculty of Electrical Engineering, University of West Bohemia, Univerzitni 8, 301 00 Plzen, Czech Republic.
Polymers (Basel). 2022 Nov 6;14(21):4758. doi: 10.3390/polym14214758.
Solid polymer electrolytes show their potential to partially replace conventional electrolytes in electrochemical devices. The solvent evaporation rate represents one of many options for modifying the electrode-electrolyte interface by affecting the structural and electrical properties of polymer electrolytes used in batteries. This paper evaluates the effect of solvent evaporation during the preparation of solid polymer electrolytes on the overall performance of an amperometric gas sensor. A mixture of the polymer host, solvent and an ionic liquid was thermally treated under different evaporation rates to prepare four polymer electrolytes. A carbon nanotube-based working electrode deposited by spray-coating the polymer electrolyte layer allowed the preparation of the electrode-electrolyte interface with different morphologies, which were then investigated using scanning electron microscopy and Raman spectroscopy. All prepared sensors were exposed to nitrogen dioxide concentration of 0-10 ppm, and the current responses and their fluctuations were analyzed. Electrochemical impedance spectroscopy was used to describe the sensor with an equivalent electric circuit. Experimental results showed that a higher solvent evaporation rate leads to lower sensor sensitivity, affects associated parameters (such as the detection/quantification limit) and increases the limit of the maximum current flowing through the sensor, while the other properties (hysteresis, repeatability, response time, recovery time) change insignificantly.
固体聚合物电解质显示出在电化学装置中部分替代传统电解质的潜力。溶剂蒸发速率是通过影响电池中使用的聚合物电解质的结构和电学性质来修饰电极 - 电解质界面的众多选择之一。本文评估了固体聚合物电解质制备过程中的溶剂蒸发对安培型气体传感器整体性能的影响。将聚合物主体、溶剂和离子液体的混合物在不同蒸发速率下进行热处理，以制备四种聚合物电解质。通过喷涂聚合物电解质层沉积的基于碳纳米管的工作电极能够制备具有不同形态的电极 - 电解质界面，然后使用扫描电子显微镜和拉曼光谱对其进行研究。所有制备的传感器都暴露在浓度为0 - 10 ppm的二氧化氮中，并分析了电流响应及其波动情况。采用电化学阻抗谱用等效电路描述传感器。实验结果表明，较高的溶剂蒸发速率会导致传感器灵敏度降低，影响相关参数（如检测/定量限），并增加流过传感器的最大电流极限，而其他性能（滞后、重复性、响应时间、恢复时间）变化不显著。
