Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification
Monitoring the concentration of hydrogen is very important as it is a flammable and explosive gas. Non-Nernstian potentiometric hydrogen sensors hold promising potentials for the sensitive detection of hydrogen. This paper reports the improved H<sub>2</sub>-sensing performance of a mixed...
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MDPI AG
2023-04-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/11/4/250 |
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| author | Liang Wang Jianxin Yi |
| author_facet | Liang Wang Jianxin Yi |
| author_sort | Liang Wang |
| collection | DOAJ |
| description | Monitoring the concentration of hydrogen is very important as it is a flammable and explosive gas. Non-Nernstian potentiometric hydrogen sensors hold promising potentials for the sensitive detection of hydrogen. This paper reports the improved H<sub>2</sub>-sensing performance of a mixed oxide ion-electron conducting (MIEC) Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> (PCO) electrode using Fe<sub>2</sub>O<sub>3</sub> surface modification. The Fe<sub>2</sub>O<sub>3</sub>-modified PCO exhibited a high response of −184.29 mV to 1000 ppm H<sub>2</sub> at 450 °C. The response values exhibited a linear or logarithmic dependence on the H<sub>2</sub> concentration for below or above 20 ppm, respectively. A sensitivity of −74.9 mV/decade in the concentration range of 20–1000 ppm was achieved, and the theoretical limit of detection was calculated to be 343 ppb. Moreover, a power-law relationship between the response time and the concentration value was also found. Electrochemical impedance analyses revealed that the excellent H<sub>2</sub>-sensing performance may be attributed to the large ratio of the electrochemical activity of the hydrogen oxidation reaction (HOR) over the oxygen exchange reaction (OER). In addition, the distribution of relaxation time (DRT) results reveal that the enhanced electrochemical kinetics caused by H<sub>2</sub> presence in air is mainly related to acceleration of the electrode surface processes. |
| first_indexed | 2024-03-11T05:07:57Z |
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| id | doaj.art-55914766362d43d2b4e4975de8dca4c8 |
| institution | Directory Open Access Journal |
| issn | 2227-9040 |
| language | English |
| last_indexed | 2024-03-11T05:07:57Z |
| publishDate | 2023-04-01 |
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| spelling | doaj.art-55914766362d43d2b4e4975de8dca4c82023-11-17T18:45:00ZengMDPI AGChemosensors2227-90402023-04-0111425010.3390/chemosensors11040250Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface ModificationLiang Wang0Jianxin Yi1State Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaState Key Laboratory of Fire Science, Department of Safety Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMonitoring the concentration of hydrogen is very important as it is a flammable and explosive gas. Non-Nernstian potentiometric hydrogen sensors hold promising potentials for the sensitive detection of hydrogen. This paper reports the improved H<sub>2</sub>-sensing performance of a mixed oxide ion-electron conducting (MIEC) Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> (PCO) electrode using Fe<sub>2</sub>O<sub>3</sub> surface modification. The Fe<sub>2</sub>O<sub>3</sub>-modified PCO exhibited a high response of −184.29 mV to 1000 ppm H<sub>2</sub> at 450 °C. The response values exhibited a linear or logarithmic dependence on the H<sub>2</sub> concentration for below or above 20 ppm, respectively. A sensitivity of −74.9 mV/decade in the concentration range of 20–1000 ppm was achieved, and the theoretical limit of detection was calculated to be 343 ppb. Moreover, a power-law relationship between the response time and the concentration value was also found. Electrochemical impedance analyses revealed that the excellent H<sub>2</sub>-sensing performance may be attributed to the large ratio of the electrochemical activity of the hydrogen oxidation reaction (HOR) over the oxygen exchange reaction (OER). In addition, the distribution of relaxation time (DRT) results reveal that the enhanced electrochemical kinetics caused by H<sub>2</sub> presence in air is mainly related to acceleration of the electrode surface processes.https://www.mdpi.com/2227-9040/11/4/250solid electrolytepotentiometric gas sensorFe<sub>2</sub>O<sub>3</sub> surface modificationelectrochemical activity |
| spellingShingle | Liang Wang Jianxin Yi Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification Chemosensors solid electrolyte potentiometric gas sensor Fe<sub>2</sub>O<sub>3</sub> surface modification electrochemical activity |
| title | Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification |
| title_full | Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification |
| title_fullStr | Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification |
| title_full_unstemmed | Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification |
| title_short | Enhancing the Potentiometric H<sub>2</sub> Sensing of Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2−δ</sub> Using Fe<sub>2</sub>O<sub>3</sub> Surface Modification |
| title_sort | enhancing the potentiometric h sub 2 sub sensing of pr sub 0 1 sub ce sub 0 9 sub o sub 2 δ sub using fe sub 2 sub o sub 3 sub surface modification |
| topic | solid electrolyte potentiometric gas sensor Fe<sub>2</sub>O<sub>3</sub> surface modification electrochemical activity |
| url | https://www.mdpi.com/2227-9040/11/4/250 |
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