NDLI: Electrophoretic deposition improves catalytic performance of Co<sub>3</sub>O<sub>4</sub> nanoparticles for oxygen reduction/oxygen evolution reactions

Content Provider	Royal Society of Chemistry (RSC)
Author	Nelson, A. Fayette, M. Robinson, R. D.
Copyright Year	2015
Abstract	The effects of nanoparticle deposition on the catalytic activity of Co3O4 nanoparticles for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are evaluated for two deposition methods: dropcasting and electrophoretic deposition (EPD). It is found that the EPD catalyst films demonstrate better catalytic activity per unit mass than do the dropcast films, as defined by diffusion-limited current, by approximately 27% for ORR and 25% for OER. When accounting for different loading levels, the absolute activities of these catalysts are superior to those of other reported Co3O4 colloidal nanoparticulate catalysts without conductive additives, showing that this material has excellent intrinsic activity for future optimization. Inspection of the electrode kinetics shows that EPD catalysts have more favorable characteristics as exhibited by their smaller Tafel slope (96 mV per decade for EPD versus 109 mV per decade for dropcast films). We analyze this enhancement by determining the metal oxide surface area for each catalyst film using a novel sequential metal deposition technique starting with electrodeposition of Ag followed by Pb underpotential deposition (UPD). Through UPD experiments we find, surprisingly, that EPD films have a smaller surface area than the dropcast films. We conclude that EPD films are more active per unit surface area. When accounting for surface area and mass, the EPD catalyst outperforms dropcast by a factor of 2.5 for ORR and 2.6 for OER. We anticipate that morphological differences in the EPD films relative to the dropcast ones, such as particle coverage and electrical conductivity, are responsible for this behavior. Such a result has important implications for future studies on the structure of EPD-manufactured nanoparticulate thin films and on the mechanisms for performance enhancement in such catalysts.
Starting Page	4274
Ending Page	4283
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta04189e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	EPD ORR Tafel Nanoparticle deposition Redox Oxygen evolution Electrophoresis Diffusion Intrinsic activity Mathematical optimization Electrode Electrophoretic deposition Lead Underpotential deposition Electrical resistivity and conductivity
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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