Progress in NASICON-based mixed-potential type gas sensors

The mixed-potential type gas sensors combining NASICON with oxide electrodes exhibit high sensing performance to typical pollution gases in the atmospheric environment in the intermediate temperature range, indicating a potential in practical application. This paper describes the state-of-the-art for the sensors based on the NASICON, including the current-type, the equilibrium-potential-type and mixed-potential-type. For improving the performance of sensors based on the NASICON and oxide electrodes, two main approaches have been utilized: the developing of new oxide electrode materials and the design of novel sensor structure for enhancing the sensing performance as well as the sensing mechanism involved in the mixed potential. (C) 2013 Elsevier B.V. All rights reserved.