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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Oxidized Laser-Induced Graphene for Efficient Oxygen Electrocatalysis.

Jibo Zhang1, Muqing Ren1, Luqing Wang2

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, TX, 77005, USA.

Advanced Materials (Deerfield Beach, Fla.)
|April 4, 2018
PubMed
Summary
This summary is machine-generated.

A new metal-free catalyst, oxidized laser-induced graphene (LIG-O), efficiently catalyzes oxygen reactions. This material significantly improves oxygen evolution and reduction reactions and lithium-oxygen battery performance.

Keywords:
electrocatalysislaser-induced grapheneoxygen evolution reactionoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Development of efficient and cost-effective catalysts is crucial for energy storage and conversion technologies.
  • Metal-free catalysts offer a sustainable alternative to traditional precious metal-based catalysts.
  • Laser-induced graphene (LIG) is a promising carbon material, but its catalytic activity often requires modification.

Purpose of the Study:

  • To develop a highly efficient metal-free catalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR).
  • To investigate the catalytic activity of oxidized laser-induced graphene (LIG-O) in Li-O2 batteries, specifically for Li2O2 decomposition.
  • To understand the role of oxygen-containing groups in enhancing catalytic performance.

Main Methods:

  • Oxidation of laser-induced graphene (LIG) using O2 plasma to create LIG-O.
  • Electrochemical characterization to evaluate OER and ORR performance.
  • Testing LIG-O as a catalyst for Li2O2 decomposition in Li-O2 batteries.

Main Results:

  • LIG-O exhibits enhanced performance in the oxygen evolution reaction with a low onset potential (260 mV) and Tafel slope (49 mV dec-1).
  • LIG-O demonstrates increased activity for the oxygen reduction reaction.
  • LIG-O significantly reduces the overpotential for Li2O2 decomposition in Li-O2 batteries (from 1.01 V to 0.63 V).

Conclusions:

  • Oxidized laser-induced graphene (LIG-O) is an efficient metal-free catalyst for OER and ORR.
  • LIG-O shows exceptional activity in catalyzing Li2O2 decomposition, improving Li-O2 battery performance.
  • Oxygen-containing groups on LIG-O are key to its catalytic activity by providing active sites and facilitating intermediate adsorption.