Zhang Hong, Liu Yanqing, Su Hailin, Zhu Yuelong, Zhu Haowei, Nie Shibin, Xu Liangji
Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Anhui University of Science and Technology, Huainan, Anhui 232001, P.R. China.
College of Public Safety and Emergency Management, Anhui University of Science and Technology, Hefei, Anhui 231131, P.R. China.
ACS Omega. 2024 Feb 14;9(8):8885-8892. doi: 10.1021/acsomega.3c06833. eCollection 2024 Feb 27.
In this work, unusual potentiometric hydrogen sensing of mixed conducting BaSrCoFeO was reported. Inspired by the unusual polarity, a dual sensing electrode (SE) potentiometric hydrogen sensor was fabricated by pairing BaSrCoFeO with electronic conducting ZnO to enhance the hydrogen response. Hydrogen sensing measurements suggested that significantly higher response, larger sensitivity, and lower limit of detection (LOD) were achieved by the dual SE sensor when compared with the single SE sensor based on BaSrCoFeO or ZnO. A high response of 97.3 mV for 500 ppm hydrogen and a low LOD of 2.5 ppm were obtained by the dual SE sensor at 450 °C. Furthermore, the effect of the Fe doping concentration in BaSrCoFeO ( = 0.2, 0.5, and 0.8) on hydrogen sensing response was investigated. The potentiometric response values to hydrogen increased monotonically with increasing Fe doping concentration. With the Fe/Co atomic ratio increased from 0.25 to 4, the responses to 500 ppm hydrogen raised by 69.6 and 94% at 350 and 450 °C, respectively. The sensing behaviors of unusual BaSrCoFeO may be ascribed to the predominant surface electrostatic effect. These results show that mixed conducting BaSrCoFeO is desirable for developing high-performance dual SE hydrogen sensors.
在这项工作中，报道了混合导体BaSrCoFeO不寻常的电位型氢传感特性。受这种不寻常极性的启发，通过将BaSrCoFeO与电子导体ZnO配对制备了一种双传感电极（SE）电位型氢传感器，以增强对氢的响应。氢传感测量表明，与基于BaSrCoFeO或ZnO的单SE传感器相比，双SE传感器实现了显著更高的响应、更大的灵敏度和更低的检测限（LOD）。双SE传感器在450℃下对500 ppm氢的响应高达97.3 mV，检测限低至2.5 ppm。此外，还研究了BaSrCoFeO中Fe掺杂浓度（= 0.2、0.5和0.8）对氢传感响应的影响。对氢的电位响应值随Fe掺杂浓度的增加而单调增加。当Fe/Co原子比从0.25增加到4时，在350℃和450℃下对500 ppm氢的响应分别提高了69.6%和94%。不寻常的BaSrCoFeO的传感行为可能归因于主要的表面静电效应。这些结果表明，混合导体BaSrCoFeO对于开发高性能双SE氢传感器是理想的。
