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Fabrication and characterization of nanostructured Pd hydride pH microelectrodes

Fabrication and characterization of nanostructured Pd hydride pH microelectrodes
Fabrication and characterization of nanostructured Pd hydride pH microelectrodes
Novel pH microsensors were made by electrodepositing mesoporous Pd films onto Pt microdisks, electrochemically loading the films with hydrogen to form the alpha+beta Pd hydride phase, and then switching to the potentiometric mode to monitor pH. To create a nanostructure, the films were deposited within a molecular template formed by the self-assembly of surfactant molecules, a technique known as true liquid crystal templating. The films retain the micrometer size of the Pt microdisk but offer electroactive areas up to 900 times larger. Optimum hydrogen loading conditions were determined, and the mesoporous Pd microdisks were found to have excellent potentiometric properties. From pH 2 to 12, their potential was Nernstian, highly reproducible, very stable (+/- 1.2 mV over 2 h), and without hysteresis. Their response time was better than 1 s. However, the presence of oxygen reduced their lifetime significantly, thereby requiring frequent reloading. These microelectrodes do not require calibration before and after measurements, a procedure normally essential for potentiometric pH microsensors. To our knowledge, these are the first results where nanostructured materials made by the true liquid crystal templating method have been used in the potentiometric mode; moreover, these are the first results demonstrating the application of nanostructured microdisks in the potentiometric mode.
scanning electrochemical microscopy, steady-state voltammetry, mesoporous platinum microelectrodes, liquid-crystalline phases, hydroxide ion oxidation, na2so4 solution ph=7, aqueous-solutions, electrode surfaces, gold electrodes, palladium
0003-2700
265-271
Imokawa, Toru
fc6becc4-df70-4998-9693-143ac572c593
Williams, Kirsty-Jo
8a96ee33-1ea4-4d1e-9bd9-b9c9a314bd7e
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Imokawa, Toru
fc6becc4-df70-4998-9693-143ac572c593
Williams, Kirsty-Jo
8a96ee33-1ea4-4d1e-9bd9-b9c9a314bd7e
Denuault, Guy
5c76e69f-e04e-4be5-83c5-e729887ffd4e

Imokawa, Toru, Williams, Kirsty-Jo and Denuault, Guy (2006) Fabrication and characterization of nanostructured Pd hydride pH microelectrodes. Analytical Chemistry, 78 (1), 265-271. (doi:10.1021/ac051328j).

Record type: Article

Abstract

Novel pH microsensors were made by electrodepositing mesoporous Pd films onto Pt microdisks, electrochemically loading the films with hydrogen to form the alpha+beta Pd hydride phase, and then switching to the potentiometric mode to monitor pH. To create a nanostructure, the films were deposited within a molecular template formed by the self-assembly of surfactant molecules, a technique known as true liquid crystal templating. The films retain the micrometer size of the Pt microdisk but offer electroactive areas up to 900 times larger. Optimum hydrogen loading conditions were determined, and the mesoporous Pd microdisks were found to have excellent potentiometric properties. From pH 2 to 12, their potential was Nernstian, highly reproducible, very stable (+/- 1.2 mV over 2 h), and without hysteresis. Their response time was better than 1 s. However, the presence of oxygen reduced their lifetime significantly, thereby requiring frequent reloading. These microelectrodes do not require calibration before and after measurements, a procedure normally essential for potentiometric pH microsensors. To our knowledge, these are the first results where nanostructured materials made by the true liquid crystal templating method have been used in the potentiometric mode; moreover, these are the first results demonstrating the application of nanostructured microdisks in the potentiometric mode.

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More information

Published date: 2006
Keywords: scanning electrochemical microscopy, steady-state voltammetry, mesoporous platinum microelectrodes, liquid-crystalline phases, hydroxide ion oxidation, na2so4 solution ph=7, aqueous-solutions, electrode surfaces, gold electrodes, palladium

Identifiers

Local EPrints ID: 44465
URI: http://eprints.soton.ac.uk/id/eprint/44465
ISSN: 0003-2700
PURE UUID: c0af7772-132d-4eaf-bfc9-fcf93596095c
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 05 Mar 2007
Last modified: 10 Dec 2019 01:56

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Contributors

Author: Toru Imokawa
Author: Kirsty-Jo Williams
Author: Guy Denuault ORCID iD

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