Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide
The nanotubular structures of IrO<sub>2</sub> and Ir metal were successfully synthesized without any template. First, IrO<sub>2</sub> nanotubes were prepared by electrospinning and post-calcination, where a fine control of synthetic conditions (e.g., precursor concentration a...
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MDPI AG
2020-06-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/6/1140 |
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| author | Areum Yu Taehui Kwon Chongmok Lee Youngmi Lee |
| author_facet | Areum Yu Taehui Kwon Chongmok Lee Youngmi Lee |
| author_sort | Areum Yu |
| collection | DOAJ |
| description | The nanotubular structures of IrO<sub>2</sub> and Ir metal were successfully synthesized without any template. First, IrO<sub>2</sub> nanotubes were prepared by electrospinning and post-calcination, where a fine control of synthetic conditions (e.g., precursor concentration and solvent composition in electrospinning solution, temperature increasing rate for calcination) was required. Then, a further thermal treatment of IrO<sub>2</sub> nanotubes under hydrogen gas atmosphere produced Ir metal nanotubes. The electroactivity of the resultant Ir metal nanotubes was investigated toward carbon monoxide (CO) oxidation using linear sweep voltammetry (LSV) and amperometry. The anodic current response of Ir metal nanotubes was linearly proportional to CO concentration change, with a high sensitivity and a short response time. The amperometric sensitivity of Ir metal nanotubes for CO sensing was greater than a nanofibrous counterpart (i.e., Ir metal nanofibers) and commercial Pt (20 wt% Pt loading on carbon). Density functional theory calculations support stronger CO adsorption on Ir(111) than Pt(111). This study demonstrates that metallic Ir in a nanotubular structure is a good electrode material for the amperometric sensing of CO. |
| first_indexed | 2024-03-10T19:15:56Z |
| format | Article |
| id | doaj.art-4e96174c642742a4993d6982b6f95da8 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T19:15:56Z |
| publishDate | 2020-06-01 |
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| series | Nanomaterials |
| spelling | doaj.art-4e96174c642742a4993d6982b6f95da82023-11-20T03:22:53ZengMDPI AGNanomaterials2079-49912020-06-01106114010.3390/nano10061140Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon MonoxideAreum Yu0Taehui Kwon1Chongmok Lee2Youngmi Lee3Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, KoreaDepartment of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, KoreaDepartment of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, KoreaDepartment of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, KoreaThe nanotubular structures of IrO<sub>2</sub> and Ir metal were successfully synthesized without any template. First, IrO<sub>2</sub> nanotubes were prepared by electrospinning and post-calcination, where a fine control of synthetic conditions (e.g., precursor concentration and solvent composition in electrospinning solution, temperature increasing rate for calcination) was required. Then, a further thermal treatment of IrO<sub>2</sub> nanotubes under hydrogen gas atmosphere produced Ir metal nanotubes. The electroactivity of the resultant Ir metal nanotubes was investigated toward carbon monoxide (CO) oxidation using linear sweep voltammetry (LSV) and amperometry. The anodic current response of Ir metal nanotubes was linearly proportional to CO concentration change, with a high sensitivity and a short response time. The amperometric sensitivity of Ir metal nanotubes for CO sensing was greater than a nanofibrous counterpart (i.e., Ir metal nanofibers) and commercial Pt (20 wt% Pt loading on carbon). Density functional theory calculations support stronger CO adsorption on Ir(111) than Pt(111). This study demonstrates that metallic Ir in a nanotubular structure is a good electrode material for the amperometric sensing of CO.https://www.mdpi.com/2079-4991/10/6/1140iridiumiridium dioxidenanotubescarbon monoxideamperometric sensingDFT calculation |
| spellingShingle | Areum Yu Taehui Kwon Chongmok Lee Youngmi Lee Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide Nanomaterials iridium iridium dioxide nanotubes carbon monoxide amperometric sensing DFT calculation |
| title | Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide |
| title_full | Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide |
| title_fullStr | Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide |
| title_full_unstemmed | Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide |
| title_short | Highly Catalytic Electrochemical Oxidation of Carbon Monoxide on Iridium Nanotubes: Amperometric Sensing of Carbon Monoxide |
| title_sort | highly catalytic electrochemical oxidation of carbon monoxide on iridium nanotubes amperometric sensing of carbon monoxide |
| topic | iridium iridium dioxide nanotubes carbon monoxide amperometric sensing DFT calculation |
| url | https://www.mdpi.com/2079-4991/10/6/1140 |
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