Resistive-Based Nanostructured CeO2 Gas Sensors: A Review

Abstract

Air pollution and the emission of toxic gases represent a critical global concern, posing significant threats to human health and environmental stability. Resistive gas sensors are widely employed to detect toxic gases, owing to their cost-effectiveness, high stability, sensitivity, and swift dynamics. Among various sensing materials, comparatively less attention has been paid to CeO2 despite its good catalytic activity and high stability. In this review paper, we are focusing on CeO2 gas sensors in pristine, doped, decorated, and composite forms. Using numerous examples, we have shown the great potential of CeO2 for gas sensing. The main features of CeO2 as a gas sensor include excellent environmental stability, the abundance of oxygen vacancies, high mechanical strength, cost-effectiveness, and good catalytic activity. However, low electrical conductivity is the main shortage of CeO2 as a gas sensor. With a high emphasis on the sensing mechanism, we believe that this review paper is highly useful for researchers working in this field.