ORCID Profile
0000-0002-7393-6796
Current Organisation
National Institute of Advanced Industrial Science and Technology
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Publisher: Elsevier BV
Date: 06-2013
Publisher: The Electrochemical Society
Date: 15-03-2013
Abstract: An yttria-stabilized-zirconia (YSZ)-based gas sensor utilizing a sensing electrode (SE) comprised of a mixture of co-sintered ZnO and Ta2O5 powders was developed and reported here. The addition of 30 wt.% Ta2O5 into ZnO after sintering at 1000oC, was found to increase the H2 sensitivity when compared with other SEs with different mixture compositions. Unfortunately, the response toward H2 was accompanied by high responses toward CO and hydrocarbons (HCs). The sensitivity as well as the selectivity improvement investigation was extended by elevating the sintering temperature from 1000o to 1300oC. The sensor utilizing ZnO(+ 30 wt.% Ta2O5)-SE that was sintered at 1300oC was found to be capable of generating high response toward 100 ppm H2, with only minor responses toward other gases examined in this study at an operating temperature of 600oC under humid conditions.
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 2013
Publisher: The Electrochemical Society
Date: 2013
DOI: 10.1149/2.091309JES
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 08-2012
Publisher: American Chemical Society (ACS)
Date: 11-11-2013
DOI: 10.1021/AM403952W
Abstract: A significant enhancement in the hydrogen (H2) sensitivity as well as selectivity after aging for more than 40 days has been observed for a mixed-potential-type sensor using ZnO (+84 wt % Ta2O5) as the sensing electrode (SE) and yttria-stabilized zirconia (YSZ) as the solid electrolyte. The effect of the aging process in enhancing the sensing characteristics of the sensor using ZnO (+84 wt % Ta2O5)-SE was studied here by investigating the changes in the morphology, crystal structure, chemical surface state, and catalytic properties of the SE material before and after aging at 500 °C for 80 days. X-ray diffraction measurements confirmed that the crystal structure of the SE material was found to be unaffected by aging, while the morphological change observed via scanning electron microscopy imaging indicated a decrease in the porosity and an increase in the particle size after aging. A significant change, particularly in the binding energy of Ta 4f, was also observed for the SE material after long-term aging. Although the catalytic activities toward the anodic reaction of H2 and the other examined gases were moderately stable after aging, a significant decrease in the heterogeneous catalytic activity of the gas-phase reaction (oxidation) of H2 was observed. Such a trend presumably resulted in a higher fraction of H2 reaching the triple-phase boundary, where the electrochemical reactions generate a sensing signal (mixed potential), resulting in high H2 sensitivity as well as high H2 selectivity after long-term aging of the present sensor.
Location: No location found
Location: Japan
No related grants have been discovered for Sri Ayu Anggraini.