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Related Concept Videos

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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Updated: Jul 25, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Sulfur quantum dots integration in conductive microrod array enable superior oxygen evolution performance.

Chuqiao Wu1, Shilin Bo2, Zhijie Luo1

  • 1School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou 510006, PR China.

Journal of Colloid and Interface Science
|April 30, 2025
PubMed
Summary

Developing electron-rich cobalt catalysts with sulfur dots significantly enhances oxygen evolution reaction (OER) performance. This strategy optimizes cobalt sites for efficient water splitting electrocatalysis.

Keywords:
ElectrocatalysisFirst-principles calculationsOxygen evolution reactionSulfur quantum dots

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient and low-cost electrocatalysts are crucial for renewable energy systems, particularly for the oxygen evolution reaction (OER).
  • Cobalt-based catalysts show promise but require electronic modulation to improve the adsorption/desorption of oxygen intermediates.
  • Optimizing cobalt (Co) sites is essential for enhancing electrocatalytic performance in OER.

Purpose of the Study:

  • To develop a reliable strategy for optimizing the activity of cobalt sites in electrocatalysts for the oxygen evolution reaction (OER).
  • To investigate the effect of sulfur dots as electron donors on the electronic structure of cobalt sites.
  • To enhance the electrocatalytic performance of cobalt-based catalysts for water splitting.

Main Methods:

  • Utilized sulfur dots as electron donors to create electron-rich cobalt sites in a cobalt-based catalyst, Co(TCNQ)2.
  • Employed density functional theory (DFT) calculations to understand the electronic modulation and energy barrier changes.
  • Synthesized and tested the sulfur dots-assisted catalyst for OER performance in an alkaline electrolyte.

Main Results:

  • Sulfur dots successfully modulated the electronic structure of Co sites, leading to electron accumulation (Coδ-) and downshifted d-band centers.
  • The electron-rich Co sites facilitated oxygen intermediate interaction and promoted the desorption of key intermediates (*OOH).
  • The optimized catalyst demonstrated a significant reduction in overpotential (from 390 mV to 238 mV at 10 mA cm-2) and a lower Tafel slope (55.2 mV dec-1) compared to RuO2/CF.

Conclusions:

  • The sulfur dots-assisted strategy effectively enhances cobalt sites' electronic structure for superior OER activity.
  • This approach offers insights into designing high-performance electrocatalysts by regulating electronic properties via electron donors.
  • The findings contribute to the advancement of efficient electrocatalysts for water splitting and renewable energy technologies.