Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer
This work presents new material for solid-contact layers—hydrous iridium dioxide IrO<sub>2</sub>·2H<sub>2</sub>O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remark...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-04-01
|
| Series: | Membranes |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-0375/11/4/259 |
| _version_ | 1797538792299560960 |
|---|---|
| author | Nikola Lenar Robert Piech Jan Wyrwa Beata Paczosa-Bator |
| author_facet | Nikola Lenar Robert Piech Jan Wyrwa Beata Paczosa-Bator |
| author_sort | Nikola Lenar |
| collection | DOAJ |
| description | This work presents new material for solid-contact layers—hydrous iridium dioxide IrO<sub>2</sub>·2H<sub>2</sub>O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remarkable electrical parameters of layers resulted in great analytical parameters of IrO<sub>2</sub>·2H<sub>2</sub>O-contacted potassium-selective electrodes. Various parameters of ion-selective electrodes were examined in the scope of this work using a potentiometry method including: linear range, repeatability, stability of potentiometric response and sensitivity to varying measurement conditions. The analytical parameters obtained for solid-contact electrodes were compared with the ones obtained for coated disc electrodes to evaluate the influence of the iridium dioxide layer. The linear range of the IrO<sub>2</sub>·2H<sub>2</sub>O-contacted K<sup>+</sup>-selective electrodes covered concentrations of K<sup>+</sup> ions from 10<sup>−6</sup> to 10<sup>−1</sup> M and the potential stability was estimated at 0.097 mV/h. The IrO<sub>2</sub>·2H<sub>2</sub>O-contacted electrodes turned out to be insensitive to varying light exposure and changes in the pH values of measured solutions (in the pH range of 2 to 10.5). A water layer test proved that, contrary to the coated disc electrode, the substantial water film is not formed between the ion-selective membrane and iridium dioxide layer. |
| first_indexed | 2024-03-10T12:36:26Z |
| format | Article |
| id | doaj.art-1e8ab7bc51ec4e31aae6c2e82361a603 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T12:36:26Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-1e8ab7bc51ec4e31aae6c2e82361a6032023-11-21T14:11:04ZengMDPI AGMembranes2077-03752021-04-0111425910.3390/membranes11040259Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction LayerNikola Lenar0Robert Piech1Jan Wyrwa2Beata Paczosa-Bator3Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, PL-30059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, PL-30059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, PL-30059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, PL-30059 Krakow, PolandThis work presents new material for solid-contact layers—hydrous iridium dioxide IrO<sub>2</sub>·2H<sub>2</sub>O, characterized by high electrical capacitance value, evaluated using chronopotentiometry (1.22 mF) and electrochemical impedance spectroscopy (1.57 mF). The remarkable electrical parameters of layers resulted in great analytical parameters of IrO<sub>2</sub>·2H<sub>2</sub>O-contacted potassium-selective electrodes. Various parameters of ion-selective electrodes were examined in the scope of this work using a potentiometry method including: linear range, repeatability, stability of potentiometric response and sensitivity to varying measurement conditions. The analytical parameters obtained for solid-contact electrodes were compared with the ones obtained for coated disc electrodes to evaluate the influence of the iridium dioxide layer. The linear range of the IrO<sub>2</sub>·2H<sub>2</sub>O-contacted K<sup>+</sup>-selective electrodes covered concentrations of K<sup>+</sup> ions from 10<sup>−6</sup> to 10<sup>−1</sup> M and the potential stability was estimated at 0.097 mV/h. The IrO<sub>2</sub>·2H<sub>2</sub>O-contacted electrodes turned out to be insensitive to varying light exposure and changes in the pH values of measured solutions (in the pH range of 2 to 10.5). A water layer test proved that, contrary to the coated disc electrode, the substantial water film is not formed between the ion-selective membrane and iridium dioxide layer.https://www.mdpi.com/2077-0375/11/4/259hydrous iridium dioxidehigh electrical capacitysolid-contact layerion-selective electrodespotassium determination |
| spellingShingle | Nikola Lenar Robert Piech Jan Wyrwa Beata Paczosa-Bator Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer Membranes hydrous iridium dioxide high electrical capacity solid-contact layer ion-selective electrodes potassium determination |
| title | Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer |
| title_full | Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer |
| title_fullStr | Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer |
| title_full_unstemmed | Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer |
| title_short | Potassium-Selective Solid-Contact Electrode with High-Capacitance Hydrous Iridium Dioxide in the Transduction Layer |
| title_sort | potassium selective solid contact electrode with high capacitance hydrous iridium dioxide in the transduction layer |
| topic | hydrous iridium dioxide high electrical capacity solid-contact layer ion-selective electrodes potassium determination |
| url | https://www.mdpi.com/2077-0375/11/4/259 |
| work_keys_str_mv | AT nikolalenar potassiumselectivesolidcontactelectrodewithhighcapacitancehydrousiridiumdioxideinthetransductionlayer AT robertpiech potassiumselectivesolidcontactelectrodewithhighcapacitancehydrousiridiumdioxideinthetransductionlayer AT janwyrwa potassiumselectivesolidcontactelectrodewithhighcapacitancehydrousiridiumdioxideinthetransductionlayer AT beatapaczosabator potassiumselectivesolidcontactelectrodewithhighcapacitancehydrousiridiumdioxideinthetransductionlayer |