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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Related Experiment Video

Updated: Apr 3, 2026

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
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A Palladium-Tin Modified Microband Electrode Array for Nitrate Determination.

Yexiang Fu1,2, Chao Bian3, Jian Kuang4,5

  • 1State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. akechi89@163.com.

Sensors (Basel, Switzerland)
|September 22, 2015
PubMed
Summary

A new palladium-tin bimetallic composite microband electrode array offers sensitive and stable nitrate determination in water. This advanced sensor shows excellent linearity and a long lifetime, providing a reliable option for water quality analysis.

Keywords:
bimetallic compositeelectrodepositionmicroband electrode arraynitrate determinationpalladium-tin coexistence

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Nitrate determination is crucial for water quality monitoring.
  • Existing methods may face limitations in sensitivity, stability, or cost.
  • Development of novel electrochemical sensors is essential for efficient nitrate analysis.

Purpose of the Study:

  • To develop a microband electrode array modified with a palladium-tin (Pd-Sn) bimetallic composite for sensitive nitrate determination.
  • To investigate the electrochemical properties and performance of the Pd-Sn modified electrode.
  • To evaluate the stability and repeatability of the sensor for practical applications.

Main Methods:

  • Fabrication of a microband electrode array using Micro Electro-Mechanical System (MEMS) technology.
  • Successive electrodeposition of palladium and tin to form a double-layer Pd-Sn composite structure.
  • Electrochemical characterization and performance evaluation for nitrate detection.

Main Results:

  • The Pd-Sn modified electrode exhibited excellent linearity (R² = 0.998) for nitrate determination in the range of 1 mg/L to 20 mg/L.
  • A high sensitivity of 398 μA/(mg∙L(-1)∙cm²) was achieved.
  • The sensor demonstrated good stability and repeatability, maintaining satisfactory analytical performance after 60 days of storage, indicating a long operational lifetime.

Conclusions:

  • The Pd-Sn bimetallic composite effectively enhances the catalytic activity and lifetime of the microband electrode array.
  • This developed sensor offers a promising and reliable option for accurate and sensitive nitrate determination in water samples.
  • The MEMS-fabricated electrode provides a robust platform for electrochemical sensing applications.