Symmetric cell for improving solid-contact pH electrodes

Zdrachek, Elena; Forrest, Tara; Bakker, Eric

doi:10.1016/j.aca.2022.340652

Cited by 6 publications

(4 citation statements)

References 47 publications

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“…The transducing layer was then prepolarised by applying a constant potential to a solution of 0.03 M of KTPFPB in acetonitrile to reach an oxidation ratio of 50 : 50 between PEDOT-C 14 0 /PEDOT-C14 + . 36 The prepolarisation potential was chosen as the potential corresponding to the oxidation peak potential. The electrodes were then air-dried for 30 min.…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Following a recent research finding by our group [34][35][36] , a new reference element based on the principle of electrochemical symmetry was also tested and implemented to reduce the temperature influence on the sensor signal. In this case, both reference and measuring electrodes are of the same nature (PVC nitrate-selective membrane) as opposed to an asymmetrical system where a plasticised membrane is measured against an all-solid-state reference, Ag/AgCl in most cases.…”

Section: Introductionmentioning

confidence: 99%

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A submersible probe with in-line calibration and a symmetrical reference element for continuous direct nitrate concentration measurements

Forrest

Cherubini

Jeanneret

et al. 2023

Environ. Sci.: Processes Impacts

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Section: Electrode Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A submersible probe with in-line calibration and a symmetrical reference element for continuous direct nitrate concentration measurements

Forrest

Cherubini

Jeanneret

et al. 2023

Environ. Sci.: Processes Impacts

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“…Here, the maximum amplification factor was limited to 3 times by considering the EMF change of the pH-responsive ISE (522 mV) upon changing the sample pH from 3 to 13 and the rated operating voltage of the e-paper (1.5 V). Based on our previous work, the largest absorbance change of e-paper was observed in the voltage range from 0.5 to 1.5 V. For this reason, the original voltage between the pH electrode and the reference electrode should be at least 150 mV.…”

Section: Resultsmentioning

confidence: 92%

Self-Powered Potentiometric Sensor Based on a Passive Signal Amplifier with Electronic Paper Display

Qileng,

Wu,

Liu

et al. 2023

Anal. Chem.

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Self-powered potentiometric sensors are attractive because of their simple operation, low cost, fast response, and ability to be integrated with electronic components. Self-powered potentiometric sensors that give a direct colorimetric output are especially interesting, because no power supply is needed, which dramatically reduces waste. Recently reported work from our group using an electronic paper display, however, exhibits limitations, because the visualization of small pH changes is difficult. A self-powered ion-selective potentiometric sensor is introduced here that may amplify the e-paper pixel sensitivity by improving the self-powered circuit. The voltage is amplified by changing the circuit from incorporating parallel to incorporating serial capacitors. With three such capacitors, a greatly improved sensitivity is observed, amplifying the absorbance 3-fold. A portable device is realized that changes the position of the capacitors from parallel to serial through a simple mechanical sliding action. As a result, the pH information on the sample is more easily visualized with a pH uncertainty of about 0.1 when comparing the e-paper output to a color card.

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“…Based on the above, the voltage between the pH electrode and the reference electrode should change from 0.5 to 1.5 V upon changing the sample pH from 3 to 13. Unlike commercial pH probes where the range of voltage variation pivots around pH 7, 22 the potential of the probe needs to be shifted as much as possible by using a buffer of elevated pH in the inner solution. This resulted in a voltage window of 0.725 to −0.44 V for a sample pH range from 3 to 13 (Figure 3a).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Distance-Based Self-Powered Signal Transduction of Ion-Selective Electrodes to an Electronic Paper Display Array

Qileng,

Wu,

Liu

et al. 2023

Anal. Chem.

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In this article, we report on the first distance-based readout self-powered potentiometric sensor. The approach is considered more user-friendly for detection by the naked eye and is less prone to optical interferences compared with a direct observation of the pixel darkening. pH-selective electrodes were chosen as a model system to demonstrate the principle in which seven bar-shaped pixels connected in series on one e-paper share one common ground. By connecting each of the pixels serially to capacitors of different capacitances, the fraction of the measurement cell voltage loaded onto the pixels becomes controllable. Consequently, the pixels give different gray values when powered by the same ion-selective electrode (ISE). As a result, the pH information on the sample is visualized as a distance-based signal and the dependence between the capacitance and 1/K (the reciprocal slope in the relationship between absorbance and pH) was constructed. In the current system, a 1 μF capacitance difference changes the value of 1/K by 4.18. With the current setup, the pH accuracy is about 0.5 when comparing the e-paper output to a color card.

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Symmetric cell for improving solid-contact pH electrodes

Cited by 6 publications

References 47 publications

A submersible probe with in-line calibration and a symmetrical reference element for continuous direct nitrate concentration measurements

A submersible probe with in-line calibration and a symmetrical reference element for continuous direct nitrate concentration measurements

Self-Powered Potentiometric Sensor Based on a Passive Signal Amplifier with Electronic Paper Display

Distance-Based Self-Powered Signal Transduction of Ion-Selective Electrodes to an Electronic Paper Display Array

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