Issue 98, 2014

Sub-ppm H2S sensor based on NASICON and CoCr2−xMnxO4 sensing electrode

Abstract

Solid electrochemical sensors based on sodium super ionic conductor (NASICON) and spinel-type oxide CoCr2−x MnxO4 (x = 0, 1, 1.2, 1.4 and 2) sensing electrode were designed for sub-ppm H2S detection. In comparison with other spinel-type oxides, the sensor using CoCr1.2Mn0.8O4 showed the maximum response of 178 mV for 10 ppm H2S at 250 °C. The sensor displayed good stability for H2S during the testing period. Moreover, the sensor exhibited excellent selectivity toward H2S against the other interference gases, such as SO2, NO2, CH4, CO, C2H4, H2 and NH3. A sensing mechanism related to the mixed potential was proposed for the sensor based on NASICON and oxide electrodes. The effect of sintering temperature had also been investigated.

Graphical abstract: Sub-ppm H2S sensor based on NASICON and CoCr2−xMnxO4 sensing electrode

Article information

Article type
Paper
Submitted
17 Jul 2014
Accepted
23 Sep 2014
First published
23 Sep 2014

RSC Adv., 2014,4, 55334-55340

Sub-ppm H2S sensor based on NASICON and CoCr2−xMnxO4 sensing electrode

H. Zhang, T. Zhong, R. Sun, X. Liang and G. Lu, RSC Adv., 2014, 4, 55334 DOI: 10.1039/C4RA07249A

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