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Related Concept Videos

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Related Experiment Video

Updated: May 21, 2025

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Co-Motif-Engineered RuO2 Nanosheets for Robust and Efficient Acidic Oxygen Evolution.

Jiandong Hu1, Le Tong2, Yanlin Jia1

  • 1School of Materials Science and Engineering, Central South University, Changsha, Hunan 410083, People's Republic of China.

ACS Applied Materials & Interfaces
|March 19, 2025
PubMed
Summary

Cobalt doping enhances ruthenium dioxide (RuO2) nanosheets for acidic oxygen evolution reactions (OER). This improves water electrolysis efficiency by shifting the reaction mechanism and increasing catalyst stability.

Keywords:
AEM pathwayCo-doped RuO2 nanosheetsacidic oxygen evolution reactionelectrocatalystoxygen vacancy engineering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient acidic oxygen evolution reaction (OER) electrocatalysts are vital for water electrolysis.
  • Ruthenium dioxide (RuO2) is a benchmark OER catalyst but suffers from instability via the lattice oxygen mechanism (LOM) in acidic media.
  • Limited large-scale applicability of RuO2 necessitates strategies to enhance its acidic performance.

Purpose of the Study:

  • To develop stable and efficient acidic OER electrocatalysts.
  • To investigate the effect of cobalt (Co) doping on RuO2 morphology, electronic structure, and OER mechanism.
  • To enhance the stability and performance of RuO2 for water electrolysis.

Main Methods:

  • Synthesis of Co-doped RuO2 nanosheets with porous morphology using a molten salt method.
  • Characterization of catalyst structure, surface area, and oxygen vacancies.
  • Electrochemical evaluation of OER performance, including overpotential and stability tests.

Main Results:

  • Co doping created porous RuO2 nanosheets with increased specific surface area and introduced oxygen vacancies.
  • Co-O(V) motifs were formed, tuning the electronic configuration of Ru and promoting the adsorbate evolution mechanism (AEM) over LOM.
  • The optimized Co0.108-RuO2 catalyst demonstrated a low overpotential (214 mV at 10 mA cm-2) and superior stability compared to undoped RuO2.

Conclusions:

  • Cobalt doping effectively engineers RuO2 morphology and electronic structure, enhancing acidic OER performance.
  • The shift to the AEM pathway and increased surface area are key to the improved catalytic activity and stability.
  • This doping strategy offers a promising route for developing advanced electrocatalysts for efficient water electrolysis.