Online monitoring of gas pollutants in the gas phase at room temperature using an electrochemical macro gas flow sensor is challenging and important for the pollutant treatment process. In this work, for the first time, we tried to explore the homogeneous and heterogeneous application of Ni(II)(CN)₄^2- in the KOH environment for the removal and monitoring of toxic nitric oxide gas. The homogeneous electrogenerated Ni(I)(CN)₄^3- was effectively removing the toxic nitric oxide gas by electro scrubbing method and the novel Ni(II)(CN)₄^2- and KOH modified electrode used for heterogeneous sensor application with high sensitivity, and reliability toward Nitric oxide gas. The sensor showed enhanced gas diffusion and high sensitivity. Scanning electron microscopy and X-ray diffraction confirmed the modification of the carbon felt electrode. In a high concentrated KOH environment, the active mediator stabilized the sensor for a long time compared to the neutral environment. The Ni(II)(CN)₄^2- fabricated carbon felt was used to monitor the concentration of nitric oxide gas pollutant; the calculated sensitivity was approximately -0.33 mA ppm^-1 cm^-2. The current increased linearly with increasing nitric oxide concentration up to 12 ppm and was validated by online gas chromatography. The developed electrochemical gas flow sensor successfully monitored the unreacted nitric oxide gas at the exit from the MER electro-scrubbing process; the concentration was calculated using a calibration plot.

在室温下使用电化学大流量传感器在线监测气相中的气体污染物对于污染物处理过程具有挑战性和重要意义。在这项工作中，我们首次尝试探索Ni（II）（CN）₄ ^2-在KOH环境中的均相和非均相应用，以去除和监测有毒的一氧化氮气体。均匀的电产生的Ni（I）（CN）₄ ^3-通过电洗涤方法和新型Ni（II）（CN）₄ ^2-有效去除有毒的一氧化氮气体以及用于异质传感器应用的KOH修饰电极，具有高灵敏度和对一氧化氮气体的可靠性。该传感器显示出增强的气体扩散和高灵敏度。扫描电子显微镜和X射线衍射证实了碳毡电极的改性。与中性环境相比，在高浓度KOH环境中，有源介体可使传感器长时间稳定。用Ni（II）（CN）₄ ^2-制成的碳毡来监测一氧化氮气体污染物的浓度。计算出的灵敏度约为-0.33 mA ppm ^-1 cm ^-2。电流随一氧化氮浓度增加至12 ppm线性增加，并通过在线气相色谱法验证。研发出的电化学气体流量传感器成功地监测了MER电洗涤过程出口处未反应的一氧化氮气体。使用校准图计算浓度。