Volume-doped cobalt titanates for ethanol sensing: an impedance and X-ray absorption spectroscopy study
Volume-doped cobalt titanates for ethanol sensing: an impedance and X-ray absorption spectroscopy study
Belle, C. J.; Wesch, G. E.; Neumeier, S.; Lozano-Rodríguez, M. J.; Scheinost, A. C.; Simon, U.
Abstract
The dynamic C2H5OH sensitivity of ilmenite-type cobalt titanates volume-doped by 2 at% Li, Na, K, Sb, La, Sm, Gd, Ho and Pb was systematically studied with respect to exhaust monitoring. Therefore, the p-type semiconducting CoTiO3 materials were characterized as resistive gas sensors via high-throughput impedance spectroscopy toward 5-200 ppm C2H5OH at 300-500 °C. The best performing materials were tested further by time-resolved and long-term measurements whereby the CoTiO3 volume-doped with K exhibited an outstanding overall performance. X-ray absorption spectroscopy on this particular material gave evidence that the local structure around Co and Ti remains unaffected by the doping despite of a slight increase in static disorder. Hence, the effect of K doping does not originate from alteration in the metal-to-oxygen interaction as expected from previous findings
Keywords: EXAFS; Cobalt titanates; sensors
Involved research facilities
- Rossendorf Beamline at ESRF DOI: 10.1107/S1600577520014265
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- DOI: 10.1107/S1600577520014265 is cited by this (Id 19192) publication
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Sensors and Actuators B 192(2014), 60-69
DOI: 10.1016/j.snb.2013.10.094
Cited 14 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-19192