US 11,885,762 B2Granted

Iridium/iridium oxide electrode for quantitatively detecting pH in sulfide ion environment, and preparation method and use thereof

AssigneeZhejiang University

InventorsYiwen Pan, Yunwen Shen, Xiaoping Wang, Zhentao Sun

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Abstract

An iridium/iridium oxide electrode for quantitatively detecting pH in a sulfide ion environment, and a preparation method and use thereof are provided. In the present disclosure, a sensitive layer of the iridium/iridium oxide electrode is coated with a sulfonated polyether ether ketone/ionic liquid (SPEEK/IL) sandwich structure. The SPEEK/IL sandwich structure includes two layers of SPEEK/SiOx/IL composite film and one layer of SPEEK film. The SPEEK film is arranged on an outermost layer. The SPEEK/IL sandwich structure covered on a surface of the electrode has an isolation effect on ions other than hydrogen ions, and especially shows a desirable isolation effect on sulfide ions with a smaller ion size. In this way, the electrode is not easily disturbed by redox substances in a complex aqueous environment.

Claims13

Dependent claims

An iridium/iridium oxide electrode for quantitatively detecting a pH in a sulfide ion environment, wherein a sensitive layer at an end of a pH electrode main body is provided with a SPEEK/IL (sulfonate polyether ether ketone/ionic liquid) sandwich structure;

the SPEEK/IL sandwich structure comprises two layers of SPEEK/SiOx/IL composite film and one layer of SPEEK film, and the SPEEK film serves as an outermost layer of the SPEEK/IL sandwich structure;
an ionic liquid (IL) layer is separately filled between the pH electrode main body and an inner layer of the two layers of SPEEK/SiOx/IL composite film, between the two layers of SPEEK/SiOx/IL composite film, and between an outer layer of the two layers of SPEEK/SiOx/IL composite film and the SPEEK film;
the pH electrode main body is an Ir/IrOx pH electrode;
the SPEEK/IL sandwich structure completely covers IrOx on a surface of the pH electrode main body;
wherein SPEEK refers to a sulfonated polyether ether ketone, and IL refers to an ionic liquid;
and
the IL of the IL layer is [HOEtMIM][Cl] with a structural formula as follows:

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/211,303Filed 19 Jun 2023 · continuation
Priority: CN 202011581887.X28 Dec 2020
Published: US 2023/0333046 A119 Oct 2023
Granted: 30 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01N 27/3335
Ion-selective electrodes or membranes: the membrane containing at least one organic component
G01N 27/302
Electrodes, e.g. test electrodes; Half-cells: pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes
G01N
Investigating or analysing materials by determining their chemical or physical properties