Amperometric gas sensor in different orientation towards analyte flow at different flow rates and different concentrations

This dataset contains three sets of raw measurement data. The experiments were carried out on three−electrode sensor platform based on ceramic substrate with platinum counter and pseudoreference electrode. Solid polymer electrolyte (SPE) contained [C2mim][NTf2] ionic liquid, PVDF and NMP. Carbon working electrode (WE) was prepared by spray coating a mixture consisting of 300 mg glassy carbon spherical powder and 1 ml of ethanol. More information about the sensors can be found in Ref.[1-2]. All three sets contain the current responses of particular sensors in time domains at conditions specified below.
Within the first set of experiments, sensors of three different working electrode areas (2.9, 8.5 and 22.4 mm2) were particularly exposed to the test profile that consisted of a stepwise increase in nitrogen dioxide concentration from 0 to 3 ppm (1 step equaled 1 ppm NO2) with subsequent three consecutive exposures to the same concentration of 3 ppm NO2 . The same test profile was applied to four different total flow rates of analyte (0.1, 0.5, 0.8 and 1 L/min) in order to observe the impact of the flow rate level on sensor parameters (sensitivity, response/recovery time, limit of detection, repeatability) for each size of the working electrode area. Each tested sensor was placed on the same position in the test chamber to be in the most identical conditions.
The second set of experiments was carried out on the sensor with the largest WE surface area which was placed in the air and rotated for angles 0°, 45°, 90° and 270° in order to examine the effect of mutual orientation of the WE surface area and analyte flow direction on sensor parameters. The same test profiles of the first experimental sets were applied to a particular angle.
The third set of experiments was provided under equilibrium conditions when the sensor with the largest WE surface area was being kept at the particular conditions (concentration and flow rate) for required amount of time to fulfil memorylessness of current fluctuations. These measurements of DC current and its fluctuation were done (i) for a range of concentration at the constant flow rate (1 L/min) and (ii) for a range of flow rates at a constant concentration (NO2 3 ppm). Firstly, a particular NO2 concentration (e.g. 1 ppm) was set with the particular total flow rate (e.g. 1 L/min). The DC current via sensor was monitored until it not changed its mean value for 100 seconds. After this (approximately 300 s from the beginning of the procedure), current fluctuations measurement (CH1) with DC current measurement (CH2) were carried out. Relative humidity and temperature were constant within all experiments (298 K and 40 %RH).
The used measurement setups are described in detail in [2,3] as well as in manuscript "Effect of orientation to analyte flow on electrochemical sensor performance and current fluctuations" submitted to journal Sensors, where all evaluations are also described.

本数据集包含三组原始测量数据。实验在基于陶瓷衬底、铂对电极和假参电极的三电极传感器平台上进行。其中，固态聚合物电解质（SPE）含有[C2mim][NTf2]离子液体、PVDF和NMP。碳工作电极（WE）通过喷涂由300毫克玻璃碳球形粉末和1毫升乙醇组成的混合物制备而成。关于传感器的更多详细信息，请参阅参考文献[1-2]。三组数据均包含特定传感器在指定条件下时间域内的电流响应。在第一组实验中，针对三种不同工作电极面积（2.9、8.5和22.4平方毫米）的传感器，特别暴露于由氮氧化物浓度从0至3ppm（每步等于1ppm NO2）逐步增加，随后连续三次暴露于相同浓度3ppm NO2的测试轮廓中。相同的测试轮廓应用于四种不同的分析物总流量（0.1、0.5、0.8和1升/分钟），以观察流量水平对工作电极面积大小各传感器参数（灵敏度、响应/恢复时间、检测限、重复性）的影响。每个测试传感器均放置在测试室中的相同位置，以保持最相似的条件。第二组实验是在具有最大WE表面积的传感器上进行的，该传感器置于空气中，以0°、45°、90°和270°的角度旋转，以考察WE表面积与分析物流动方向的相互取向对传感器参数的影响。对特定角度应用了第一组实验的相同测试轮廓。第三组实验在平衡条件下进行，此时具有最大WE表面积的传感器在特定的条件（浓度和流量）下保持一定时间，以满足电流波动无记忆的特性。这些直流电流及其波动测量包括：（i）在恒定流量（1升/分钟）下的一系列浓度范围内；（ii）在恒定浓度（NO2 3ppm）下的一系列流量范围内。首先，设置特定的NO2浓度（例如1ppm）和特定的总流量（例如1升/分钟）。通过传感器监测直流电流，直到其平均值不再变化100秒。在此之后（从程序开始的大约300秒后），进行了直流电流测量（CH2）和电流波动测量（CH1）。所有实验中的相对湿度和温度保持恒定（298开尔文和40%相对湿度）。所使用的测量装置在参考文献[2,3]以及提交给《传感器》杂志的稿件“分析物流动方向对电化学传感器性能和电流波动的影响”中均有详细描述。