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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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Electrodes: Overview01:17

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
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Updated: Jul 20, 2025

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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CDs Regulated Sulfur-Based Flexible Electrode with Range pH Values for Efficient and Durable Hydrogen Evolution

Weiju Hao1, Rikai Liang1, Shiheng Liang1

  • 1School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 31, 2023
PubMed
Summary

This study developed a novel carbon quantum dots-modified nickel sulfide electrode on filter paper for efficient and stable hydrogen production via water splitting. The electrode demonstrates excellent performance across various pH levels and high current densities.

Keywords:
carbon quantum dots-modulated Ni3S2hydrogen evolution reactionindustrial grade current densitymechanical stabilitywide range pH values

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing stable and efficient electrocatalysts for water splitting at industrial current densities and wide pH ranges is crucial for hydrogen production.
  • Nickel sulfide materials offer potential but often require modification to enhance activity and stability.

Purpose of the Study:

  • To create a highly active and stable catalytic electrode for long-term water splitting.
  • To achieve efficient hydrogen production at industrial high current densities across diverse pH conditions.

Main Methods:

  • Fabrication of carbon quantum dots (CDs) modified nickel sulfide on hydrophilic flexible filter paper (CDs-Ni3S2@HFP) via mild, one-step chemical plating.
  • Characterization of the electrode's catalytic performance in alkaline, neutral, and simulated seawater electrolytes.
  • Long-term stability testing at high current densities.

Main Results:

  • The CDs-Ni3S2@HFP electrode exhibited low overpotentials of 30 mV (1M KOH), 35 mV (simulated seawater), and 87 mV (0.5M PBS) at 10 mA cm-2.
  • The electrode demonstrated exceptional stability, maintaining efficient catalysis for over 500 hours at a high current density of 500 mA cm-2.
  • CDs modification enhanced intrinsic activity, surface area, electron transfer, and corrosion resistance of Ni3S2.

Conclusions:

  • The developed CDs-Ni3S2@HFP electrode offers a mild, universal, and scalable solution for efficient and stable water splitting.
  • This work provides a promising catalytic material for hydrogen production, energy storage, and flexible device fabrication.