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Metal oxides/CNT nano-composite catalysts for oxygen reduction/oxygen evolution in alkaline media

Paper ID Volume ID Publish Year Pages File Format Full-Text
44916 46375 2015 5 PDF Available
Title
Metal oxides/CNT nano-composite catalysts for oxygen reduction/oxygen evolution in alkaline media
Abstract

•We synthesized MOx/CNT nano-composite catalysts by depositing metal oxides onto functionalized CNTs.•We evaluated the electrochemical activity of the catalysts in alkaline media using Rotating Disc Electrode experiments.•The catalysts were characterized by XRD, SEM, TEM, XPS and BET techniques.•The catalysts are bifunctionally active and have the potential to replace PGM-based catalysts.•Usage of such catalysts can assist in decreasing the dependence on petroleum-derived fuels.

A series of highly active state-of-the-art catalysts have been synthesized by depositing high loadings of transition metal oxides (MnO2, Co3O4, NiO, CuO and FexOy) onto nitrogen-doped carbon nanotubes (CNTs) for bi-functional catalysis in alkaline media. The metal oxides have been dispersed onto functionalized CNTs by an improved impregnation method. This novel, synthetic approach allows for both the preparation of functionalized nitrogen-doped CNTs as well as the even dispersion of metal oxides onto the walls of the CNTs. The catalysts have been characterized by Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) methods. Catalytic activity has been measured using a Rotating Disc Electrode (RDE) experiment. The resulting catalysts are stable in alkaline media under experimental conditions and have high bi-functional electrocatalytic activity—both for the oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). From this series of catalysts, the most active catalyst for ORR is the 50 wt% MnO2/CNT catalyst with a half-wave potential of 0.84 V at the current density of −2.1 mA cm−2 and an onset at 0.98 V versus RHE. The most active for OER is the 50 wt% NiO/CNT catalyst with an onset potential at 1.45 V versus RHE.

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Keywords
Oxygen reduction catalyst; Oxygen evolution catalyst; Non-platinum group catalyst; Environmental catalysts; Functionalized carbon nanotubes
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Metal oxides/CNT nano-composite catalysts for oxygen reduction/oxygen evolution in alkaline media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 623–627
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us