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Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...

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Updated: Mar 26, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

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Self-Powered Bipolar Electrochromic Electrode Arrays for Direct Displaying Applications.

Xiaowei Zhang^1,2, Lingling Zhang^1,2, Qingfeng Zhai^1,2

¹State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, Jilin 130022, P. R. China.

Analytical Chemistry

|February 10, 2016

Summary

A novel self-powered bipolar electrochromic electrode (SP-BP-EC-E) array simplifies catalyst screening and analysis. This innovative platform uses chemical energy, eliminating background noise for reliable, high-throughput measurements of catalysts and enzyme substrates.

Area of Science:

Electrochemistry
Materials Science
Analytical Chemistry

Background:

Traditional bipolar electrode systems suffer from background signals and electrolysis interference.

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Accurate catalyst screening and activity measurement are crucial for various applications.

Enzyme substrate quantification requires sensitive and reliable analytical methods.