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Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Related Experiment Video

Updated: Jul 9, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

From silver nanoparticles to nanoclusters: enhanced oxygen evolution electrocatalysis through size reduction.

Sheetal Sheetal1, Usama Ansari1, Sanjeeve Thakur1

  • 1Department of Chemistry, Netaji Subhas University of Technology, Dwarka Sector-3, Dwarka, Delhi, 110078, India. nancy@nsut.ac.in.

The Analyst
|July 7, 2026
PubMed
Summary

Silver nanoclusters (AgNCs) show excellent performance for the oxygen evolution reaction (OER), a key step in water splitting. These L-Proline-stabilized AgNCs (L-Pro-AgNCs) are efficient and stable electrocatalysts.

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Last Updated: Jul 9, 2026

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Published on: June 16, 2014

Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Metal nanoclusters (MNCs) offer unique properties for catalysis.
  • Oxygen evolution reaction (OER) is crucial for water splitting but remains challenging.
  • Applications of MNCs in OER are less explored.

Purpose of the Study:

  • Synthesize and investigate L-Proline-stabilized silver nanoclusters (L-Pro-AgNCs) as electrocatalysts for OER.
  • Compare the OER performance of L-Pro-AgNCs with silver nanoparticles (AgNPs) and RuO2.
  • Highlight the size-dependent catalytic advantages of silver nanoclusters.

Main Methods:

  • Synthesis of fluorescent L-Pro-AgNCs.
  • Electrocatalytic evaluation using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry.
  • Comparison with L-Pro-AgNPs and commercial RuO2.

Main Results:

  • L-Pro-AgNCs demonstrated superior OER activity with a low overpotential (~250 mV) and Tafel slope (116 mV dec⁻¹).
  • Enhanced electrochemical active surface area and charge-storage capability observed for L-Pro-AgNCs.
  • Faster interfacial electron transfer and excellent stability (>16 h) confirmed.

Conclusions:

  • Silver nanoclusters exhibit significant size-dependent electrocatalytic advantages for OER.
  • L-Pro-AgNCs are efficient and stable electrocatalysts for sustainable energy conversion.
  • This work establishes MNCs as promising candidates for OER applications.