期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 352, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130988
关键词
Electrochemical; Activity; Gas sensor; Mixed potential; Perovskite
资金
- National Natural Science Foundation ofChina [61871359]
- Fundamental Research Funds for the Central Universities [WK2320000044, WK2320000053]
Through theoretical and experimental studies, it has been found that the mixed potential response of perovskite oxides to hydrogen is correlated to the ratio of electroactivities, with a greater ratio leading to a larger response. This ratio can serve as a descriptor of response and potentially guide the design of high-response materials.
Development of high-performance mixed potential gas sensors is challenging, due to a lack of understanding towards the key material properties affecting the sensing performance. Herein, with a combined theoreticalexperimental study, we show that mixed potential response of perovskite oxides to hydrogen correlates to ratio of the electroactivities (exchange current densities or polarization resistances) under typical Tafel-type sensing condition. Experimental results obtained for five different perovskites indicate that a greater ratio of activities for the hydrogen oxidation reaction and the oxygen reduction one favors larger response, following a semi-logarithm relation, which agrees well with the theoretical prediction. The activity ratio could serve as a descriptor of response that is potentially applicable to different materials and target gases. These findings link mixed potential gas response to intrinsic materials properties, and would help guide the design of high response materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据