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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Oxygen evolution reaction on MoS2/C rods-robust and highly active electrocatalyst.

Karolina Wenelska1, Anna Dymerska1, Ewa Mijowska1

  • 1West Pomeranian University of Technology, Szczecin Faculty of Chemical Technology and Engineering, Department of Nanomaterials Physicochemistry, Piastow Ave. 42, 71-065 Szczecin, Poland.

Nanotechnology
|August 11, 2023
PubMed
Summary

This study presents a new method for creating molybdenum disulfide and carbon (MoS2/C) rod structures for electrocatalysis. These novel catalysts show excellent performance and stability in oxygen evolution reactions, offering a promising noble-metal-free alternative.

Keywords:
MoS2/Coxygen evolution reactionrodswater splitting

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Area of Science:

  • Electrocatalysis
  • Materials Science
  • Energy Conversion

Background:

  • Water oxidation (oxygen evolution reaction, OER) is critical for water splitting, batteries, and fuel cells.
  • Developing efficient, stable, and cost-effective electrocatalysts is a major challenge.
  • Noble metal catalysts are effective but expensive and scarce.

Purpose of the Study:

  • To develop a facile and scalable fabrication method for a novel molybdenum disulfide and carbon (MoS2/C) composite.
  • To evaluate the electrocatalytic performance and stability of the MoS2/C composite for the oxygen evolution reaction (OER).
  • To investigate the structure-activity relationships and reaction mechanism of the developed catalyst.

Main Methods:

  • Fabrication of rod-like MoS2/C structures from 2D MoS2 using chemical vapor deposition (CVD).
  • Electrocatalytic testing in an alkaline medium to assess OER performance (overpotential, Tafel slope, turnover frequency).
  • Long-term stability tests under various current densities.
  • Ex situ analyses (XPS, XRD, Raman) to characterize the catalyst and explore the reaction mechanism.

Main Results:

  • The MoS2/C composite exhibited superior OER performance with an overpotential of 132 mV at 10 mA cm-2 and a Tafel slope of 55.6 mV dec-1.
  • Excellent stability was demonstrated over extended periods at high current densities (10, 20, and 50 mA cm-2).
  • High turnover frequency (TOF) of 58 1/s at 10 mA cm-2 indicates high intrinsic activity.

Conclusions:

  • The facilely fabricated MoS2/C rod structures serve as robust, noble-metal-free electrocatalysts for OER.
  • Enhanced activity is attributed to increased electrochemically active surface area (ECSA) due to curvature effects and synergistic effects with Fe species.
  • MoS2, carbon, and iron oxides are identified as the primary active species in the OER mechanism.