Mixed-potential NH3 sensor with Fe2(MoO4)3 as the sensing electrode: Performance and mechanistic insights

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2025-03-04 DOI:10.1016/j.ssi.2025.116814

Jingxin Wang, Hongming Liu, Hai Xiong, Jianzhong Xiao

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引用次数: 0

Abstract

Ammonia (NH₃) is recognized as an important exhaled gas in patients with renal and hepatic diseases, with its concentration closely correlated to disease progression. Thus, detecting NH₃ in exhaled breath is crucial for self-diagnosis, disease monitoring, and large-scale screening of specific populations. In this study, we synthesized the sensing material iron molybdate (Fe₂(MoO₄)₃) and systematically investigated its performance in NH₃ detection. The results indicated that the sensor can realize the detection of 0.38 ppm NH₃, with the optimal sintering temperature identified as 550 °C and the optimal operating temperature as 475 °C. The response of the sensor to 5 ppm NH₃ is −24.3 ± 0.7 mV with response/recovery time of (55 ± 4)/ (86 ± 5) s. The X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscope (SEM) were applied to analysis the phase composition and morphology. The sensing mechanism was also discussed basing on the results of temperature-programmed desorption (TPD) and electrochemical impedance spectroscopy (EIS). Furthermore, the sensor exhibited reliable and stable performance across different test cycles, demonstrating its short-term and long-term stability.

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.