fulltext.study @t Gmail

Enhanced Pt stability in MO2 (M = Ce, Zr or Ce0.9Zr0.1)-promoted Pt/C electrocatalysts for oxygen reduction reaction in PAFCs

Paper ID Volume ID Publish Year Pages File Format Full-Text
42027 45908 2010 12 PDF Available
Title
Enhanced Pt stability in MO2 (M = Ce, Zr or Ce0.9Zr0.1)-promoted Pt/C electrocatalysts for oxygen reduction reaction in PAFCs
Abstract

Well dispersed PtMO2/C (M = Ce, Zr, Ce0.9Zr0.1) electrocatalysts were prepared towards improving the sintering and corrosion resistance during the oxygen reduction reaction (ORR) in phosphoric acid fuel cells PAFCs. Marginally better kinetics performance can be ascribed to the promoting effect of the metal oxides. However, fairly close Tafel slope values for ORR on PtMO2/C catalysts in high overpotential region and low overpotential region indicate that metal oxides preserve Pt active sites and prevent the Pt surface from oxidation. Electrochemical surface area (ECA) measurement, polarization curves measurement, X-ray Diffraction (XRD) patterns and transmission electronic microscopy (TEM) images were taken on Pt/C and PtMO2/C electrocatalysts before and after long term chronoamperometry tests. These experiments showed that the incorporation of metal oxides (MO2) hindered sintering of Pt nanoparticles significantly. Formation of a core–shell structure and an unusual passivation phenomenon pertinent to mixed oxides are proposed to explain the excellent stability of PtCeZrO2/C in an environment mimicking real operation conditions in phosphoric acid fuel cells (PAFCs).

Graphical abstractPtMO2/C (M = Ce, Zr, Ce0.9Zr0.1) electrocatalysts were prepared towards improving the sintering and corrosion resistance under the severe conditions of the oxygen reduction reaction (ORR) in PAFCs (85%H3PO4, 110 °C). MO2 hindered sintering of Pt nanoparticles significantly during long term chronoamperometry test, and the best results were obtained with the mixed oxide (Pt Ce0.9Zr0.1O2/C).Figure optionsDownload full-size imageDownload high-quality image (95 K)Download as PowerPoint slide

Keywords
DHE, dynamic hydrogen electrode; CVs, cyclic voltammograms; ECA, electrochemical active surface area; EDS, energy dispersive X-ray analyser; GDL, gas diffusion layer; ORR, oxygen reduction reaction; PAFC, phosphoric acid fuel cells; PEMFCs, proton exchang
First Page Preview
Enhanced Pt stability in MO2 (M = Ce, Zr or Ce0.9Zr0.1)-promoted Pt/C electrocatalysts for oxygen reduction reaction in PAFCs
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 54–65
Authors
, , , , , ,
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