The determination of gases and other volatile compounds using electrochemical gas sensors remains a challenge with respect to sensitivity and selectivity. Many real-life situations require fast, sensitive, and yet easy-to-operate sensors for gaseous hydrogen peroxide (H₂O₂) that can operate at room temperature. Herein, we present an H₂O₂ gas sensor comprising a polyacrylic acid and NaOH gel electrolyte that included Cu(II) ions acting as a redox mediator and commercially available screen-printed carbon electrodes. Aqueous polyacrylate gel electrolyte containing Cu(II) provided for sensing material that enabled the accumulation and stabilization of the gaseous analyte and via redox interaction with Cu(II) its fast and sensitive detection. The designed sensor exhibited good sensitivity in the low mg m⁻³ range with a wide linear response in the examined concentration range of 10–100 mg m⁻³ and a rapid detection after only 2 min accumulation under ambient conditions. Sensor's relatively simple setup and solid electroanalytical performance have strong application potential in emerging fields such as clinical diagnostics, explosive detection, environmental monitoring and occupational health and safety.

使用电化学气体传感器测定气体和其他挥发性化合物在灵敏度和选择性方面仍然是一个挑战。许多现实生活中的情况需要快速、灵敏且易于操作的气态过氧化氢 (H ₂ O ₂ ) 传感器，这些传感器可以在室温下工作。在此，我们提出了一种 H ₂ O ₂气体传感器包含聚丙烯酸和 NaOH 凝胶电解质，其中包含充当氧化还原介质的 Cu(II) 离子和市售的丝网印刷碳电极。含有 Cu(II) 的水性聚丙烯酸酯凝胶电解质提供传感材料，使气态分析物能够积累和稳定，并通过与 Cu(II) 的氧化还原相互作用实现快速灵敏的检测。设计的传感器在低 mg m ^{-3范围内表现出良好的灵敏度，在 10–100 mg m -3}的检测浓度范围内具有宽线性响应并且在环境条件下仅积累 2 分钟后即可快速检测。传感器相对简单的设置和扎实的电分析性能在临床诊断、爆炸物检测、环境监测和职业健康与安全等新兴领域具有强大的应用潜力。