Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids
© 2019 Elsevier B.V. From a safety perspective, it is vital to have fast responding gas sensors for toxic and explosive gases in the event of a gas leak. Amperometric gas sensors have been developed for such a purpose, but their response times are often relatively slow – on the order of 50 secon...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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ELSEVIER SCIENCE BV
2019
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| Online Access: | http://purl.org/au-research/grants/arc/DE120101456 http://hdl.handle.net/20.500.11937/79838 |
| _version_ | 1848764114857361408 |
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| author | Hussain, Ghulam Ge, M. Zhao, C. Silvester-Dean, Debbie |
| author_facet | Hussain, Ghulam Ge, M. Zhao, C. Silvester-Dean, Debbie |
| author_sort | Hussain, Ghulam |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2019 Elsevier B.V.
From a safety perspective, it is vital to have fast responding gas sensors for toxic and explosive gases in the event of a gas leak. Amperometric gas sensors have been developed for such a purpose, but their response times are often relatively slow – on the order of 50 seconds or more. In this work, we have developed sensors for hydrogen gas that demonstrate ultra-fast response times. The sensor consists of an array of gold microchannel electrodes, electrodeposited with platinum nanoparticles (PtNPs)to enable hydrogen electroactivity. Very thin layers (∼9 μm)of room temperature ionic liquids (RTILs)result in an extremely fast response time of only 2 s, significantly faster than the other conventional electrodes examined (unmodified Pt electrode, and PtNP modified Au electrode). The RTIL layer in the microchannels is much thinner than the channel length, showing an interesting yet complex diffusion pattern and characteristic thin-layer behavior. At short times (e.g. on the timescale of cyclic voltammetry), the oxidation current is smaller and steady-state in nature, compared to macrodisk electrodes. At longer times (e.g. using long-term chronoamperometry), the diffusion layer is large for all surfaces and extends to the liquid/gas phase boundary, where the gas is continuously replenished from the flowing gas stream. Thus, the current response is the largest on the microchannel electrode, resulting in the highest sensitivity and lowest limit of detection for hydrogen. These microchannel electrodes appear to be highly promising surfaces for the ultrafast detection of hydrogen gas, particularly at relevant concentrations close to, or below, the lower explosive limit of 4 vol-% H2. |
| first_indexed | 2025-11-14T11:14:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-79838 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:14:13Z |
| publishDate | 2019 |
| publisher | ELSEVIER SCIENCE BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-798382021-01-08T07:54:28Z Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids Hussain, Ghulam Ge, M. Zhao, C. Silvester-Dean, Debbie Science & Technology Physical Sciences Chemistry, Analytical Chemistry Hydrogen sensing Gas detection Microchannels Room temperature ionic liquids Response time OXYGEN REDUCTION ELECTROCHEMICAL OXIDATION FUEL-CELL ELECTRODES BIS(TRIFLUOROMETHYLSULFONYL)IMIDE VOLTAMMETRY SUPEROXIDE EVOLUTION KINETICS REDOX © 2019 Elsevier B.V. From a safety perspective, it is vital to have fast responding gas sensors for toxic and explosive gases in the event of a gas leak. Amperometric gas sensors have been developed for such a purpose, but their response times are often relatively slow – on the order of 50 seconds or more. In this work, we have developed sensors for hydrogen gas that demonstrate ultra-fast response times. The sensor consists of an array of gold microchannel electrodes, electrodeposited with platinum nanoparticles (PtNPs)to enable hydrogen electroactivity. Very thin layers (∼9 μm)of room temperature ionic liquids (RTILs)result in an extremely fast response time of only 2 s, significantly faster than the other conventional electrodes examined (unmodified Pt electrode, and PtNP modified Au electrode). The RTIL layer in the microchannels is much thinner than the channel length, showing an interesting yet complex diffusion pattern and characteristic thin-layer behavior. At short times (e.g. on the timescale of cyclic voltammetry), the oxidation current is smaller and steady-state in nature, compared to macrodisk electrodes. At longer times (e.g. using long-term chronoamperometry), the diffusion layer is large for all surfaces and extends to the liquid/gas phase boundary, where the gas is continuously replenished from the flowing gas stream. Thus, the current response is the largest on the microchannel electrode, resulting in the highest sensitivity and lowest limit of detection for hydrogen. These microchannel electrodes appear to be highly promising surfaces for the ultrafast detection of hydrogen gas, particularly at relevant concentrations close to, or below, the lower explosive limit of 4 vol-% H2. 2019 Journal Article http://hdl.handle.net/20.500.11937/79838 10.1016/j.aca.2019.04.042 English http://purl.org/au-research/grants/arc/DE120101456 http://purl.org/au-research/grants/arc/DP150101861 http://purl.org/au-research/grants/arc/LE130100121 http://creativecommons.org/licenses/by/4.0/ ELSEVIER SCIENCE BV fulltext |
| spellingShingle | Science & Technology Physical Sciences Chemistry, Analytical Chemistry Hydrogen sensing Gas detection Microchannels Room temperature ionic liquids Response time OXYGEN REDUCTION ELECTROCHEMICAL OXIDATION FUEL-CELL ELECTRODES BIS(TRIFLUOROMETHYLSULFONYL)IMIDE VOLTAMMETRY SUPEROXIDE EVOLUTION KINETICS REDOX Hussain, Ghulam Ge, M. Zhao, C. Silvester-Dean, Debbie Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title | Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title_full | Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title_fullStr | Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title_full_unstemmed | Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title_short | Fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| title_sort | fast responding hydrogen gas sensors using platinum nanoparticle modified microchannels and ionic liquids |
| topic | Science & Technology Physical Sciences Chemistry, Analytical Chemistry Hydrogen sensing Gas detection Microchannels Room temperature ionic liquids Response time OXYGEN REDUCTION ELECTROCHEMICAL OXIDATION FUEL-CELL ELECTRODES BIS(TRIFLUOROMETHYLSULFONYL)IMIDE VOLTAMMETRY SUPEROXIDE EVOLUTION KINETICS REDOX |
| url | http://purl.org/au-research/grants/arc/DE120101456 http://purl.org/au-research/grants/arc/DE120101456 http://purl.org/au-research/grants/arc/DE120101456 http://hdl.handle.net/20.500.11937/79838 |