Hao Xidong, Meng Xiangli, Yu Tianling, Wang Zihao, Wang Yinglin, Sun Shanfu, Cheng Pengfei, Yang Yintang, Yang Qianyong
Xidian University, School of Aerospace Science and Technology, 266 Xifeng Road, Xi'an 710126, China.
Xidian University, School of Microelectronics; Key Laboratory of Wide Band-Gap Semiconductors and Devices, Xi'an 710126, China.
ACS Sens. 2025 Jun 27;10(6):4609-4621. doi: 10.1021/acssensors.5c00956. Epub 2025 May 27.
Herein, porous α-FeO nanofoam was successfully synthesized and used as a sensing electrode to fabricate a yttria-stabilized zirconia (YSZ) mixed-potential hydrogen sulfide (HS) sensor for real-time monitoring of hazardous HS gas. The sintering temperature was adjusted to modify the microstructure of the sensing electrode material and its electrochemical reaction intensity to HS, enhancing the sensor's performance. Among the tested materials, α-FeO nanofoam sintered at 800 °C exhibited the highest electrochemical catalytic activity toward HS in electrochemical tests, suggesting its suitability as a sensing electrode material for YSZ-based HS sensors. The sensor incorporating α-FeO nanofoam sintered at 800 °C achieved the highest response of -273 mV to 10 ppm of HS at 625 °C. Moreover, this sensor exhibited a low detection limit of 100 ppt and, within the HS concentration range of 0.5-10 ppm, a high sensitivity of -180.3 mV/decade, outperforming other reported YSZ-based HS sensors. Furthermore, this fabricated sensor exhibited excellent repeatability, selectivity, and long-term stability, indicating its potential for industrial safety early warnings and precise environmental monitoring. This study provides a valuable reference for designing porous sensing electrode materials and enhancing the sensing performance of mixed-potential gas sensor.
在此，成功合成了多孔α-FeO纳米泡沫，并将其用作传感电极，以制备用于实时监测有害硫化氢（HS）气体的氧化钇稳定氧化锆（YSZ）混合电位硫化氢传感器。通过调整烧结温度来改变传感电极材料的微观结构及其对HS的电化学反应强度，从而提高传感器的性能。在测试的材料中，800℃烧结的α-FeO纳米泡沫在电化学测试中对HS表现出最高的电化学催化活性，表明其适合作为基于YSZ的HS传感器的传感电极材料。包含800℃烧结的α-FeO纳米泡沫的传感器在625℃下对10 ppm的HS实现了-273 mV的最高响应。此外，该传感器的检测限低至100 ppt，在0.5-10 ppm的HS浓度范围内，灵敏度高达-180.3 mV/十倍浓度变化，优于其他报道的基于YSZ的HS传感器。此外，该制造的传感器表现出优异的重复性、选择性和长期稳定性，表明其在工业安全预警和精确环境监测方面的潜力。本研究为设计多孔传感电极材料和提高混合电位气体传感器的传感性能提供了有价值的参考。
