Metal Oxide Solid-Layer Ion Electrode for Stable Potential

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Solution Overview

Problem

Conventional ion sensors experience potential instability due to repeated and long-term use, necessitating frequent calibration and electrode replacement.

Innovation Solution

The electrode incorporates an internal solid layer containing a metal oxide and a solid electrolyte, enhancing potential stability for repeated and long-term use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional ion-selective electrode uses an internal solid layer with insertion materials (Na0.33MnO2, LiαFePO4, KbMnO2·mH2O) mixed with conductive agent and binder, then the electrode can be manufactured with existing materials, but the potential becomes unstable due to repeated use and long-term use

Engineering Contradiction:

Improvepotential stabilityVSAvoidelectrode lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical composition parameters of the internal solid layer by introducing specific metal oxides (Fe2O3, Fe3O4, MnO2, Co3O4, NiO, CuO, ZnO) and controlling their content ratios. This compositional parameter change improves potential stability during repeated use while maintaining electrode functionality over longer periods

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite internal solid layer by combining metal oxide particles with a solid electrolyte matrix (such as PVDF, PAN, or PEO). This composite structure provides both the electrochemical activity of metal oxides and the ionic conductivity of the solid electrolyte, resolving the contradiction between reliability and duration of action

Inventive Principle:

Principle #40Composite materials

2Productivity

If the electrode potential is unstable, then frequent calibration and electrode replacement are required, but this increases time loss and reduces measurement efficiency

Engineering Contradiction:

Improvemeasurement efficiencyVSAvoidcalibration and replacement time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

By optimizing the composition parameters of the internal solid layer (metal oxide type, content, and particle size distribution), the patent achieves stable electrode potential that reduces calibration frequency and extends electrode lifespan, thereby improving measurement efficiency and reducing time loss

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The electrode provides higher potential stability, reducing the frequency of calibration and replacement, thereby improving reliability and performance over time.

Implementation Method 1

an internal solid layer containing a metal oxide and a solid electrolyte

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentEP4089406B1Ion sensor

Publication Date: 2026.02.11 SYSMEX CORP

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AI summary

An electrode with higher potential stability for repeated use and/or long-term use in an ion sensor is provided. The electrode includes an internal solid layer containing a metal oxide and a solid electrolyte and an electrode material.