Yang Lin, Zhang Yiran, Zheng Haonan, Wu Chunping, Wang Junfang, Chen Ting, Lin He
Key Laboratory for Power Machinery and Engineering of the Ministry of Education, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
College of Smart Energy, Shanghai Jiao Tong University, Shanghai 200240, China.
Langmuir. 2024 Aug 6;40(31):16239-16248. doi: 10.1021/acs.langmuir.4c01389. Epub 2024 Jul 23.
Mixed potential ammonia (NH) sensors with the Fe- and Mo-codoped BiVO sensing electrode and Ag reference electrode based on the yttria-stabilized zirconia solid electrolyte were developed. Fe- and Mo-doped BiVO sensing materials were prepared using solution combustion synthesis and then characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). It was observed that Fe doping could greatly improve the response rate, while Mo doping could enhance the response signal (Δ) and sensitivity. Based on the optimal doping ratio of Fe and Mo each, the synergistic enhancement of the performance by Fe and Mo codoping was investigated. The sensor coated by BiVFeMoO materials exhibited a prominent sensing performance to a low concentration of 10-50 ppm of NH at 525 °C with the outstanding sensitivity of -148.988 mV/decade. Fe and Mo doping also improved the selectivity of the sensor to NH, with the relative deviations less than ±8% of other typical gases' interference including NO, NO, CO, CO, and CH. Besides, the sensor showed good resistance to fluctuations in the oxygen concentration and favorable stability against changes in the water vapor concentration. In addition, the sensor also exhibited good long-term stability. The mixed potential response mechanism was further discussed and analyzed through polarization curves as well as through gas chromatography and infrared absorption spectroscopy.
基于氧化钇稳定的氧化锆固体电解质，开发了具有铁和钼共掺杂的BiVO传感电极以及银参比电极的混合电位氨（NH₃）传感器。采用溶液燃烧合成法制备了铁和钼掺杂的BiVO传感材料，然后通过X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散光谱（EDS）和X射线光电子能谱（XPS）对其进行表征。观察到铁掺杂可大大提高响应速率，而钼掺杂可增强响应信号（Δ）和灵敏度。基于各自铁和钼的最佳掺杂比例，研究了铁和钼共掺杂对性能的协同增强作用。涂覆有BiVFeMoO材料的传感器在525℃下对10 - 50 ppm的低浓度NH₃表现出卓越的传感性能，灵敏度高达-148.988 mV/十倍频程。铁和钼掺杂还提高了传感器对NH₃的选择性，对于包括NO、NO₂、CO、CO₂和CH₄在内的其他典型气体干扰，相对偏差小于±8%。此外，该传感器对氧浓度波动具有良好的抗性，对水蒸气浓度变化具有良好的稳定性。此外，该传感器还表现出良好的长期稳定性。通过极化曲线以及气相色谱和红外吸收光谱进一步讨论和分析了混合电位响应机制。
