Electrodeposited ultrafine NbOx, ZrOx, and TaO x nanoparticles on carbon black supports for oxygen reduction electrocatalysts in acidic media

Handle URI:
http://hdl.handle.net/10754/562971
Title:
Electrodeposited ultrafine NbOx, ZrOx, and TaO x nanoparticles on carbon black supports for oxygen reduction electrocatalysts in acidic media
Authors:
Seo, Jeongsuk; Cha, Dong Kyu; Takanabe, Kazuhiro ( 0000-0001-5374-9451 ) ; Kubota, Jun; Domen, Kazunari
Abstract:
A remarkable electrocatalytic activity was obtained for the oxygen reduction reaction (ORR) in acidic solutions on ultrafine nano-oxide catalysts based on group IV or V elements. By potentiostatic electrodepostion in nonaqueous solutions at 298 K followed by heat treatment in H2 gas, highly dispersed fine nanoparticles of NbOx, ZrOx, and TaOx with sizes of less than 5 nm were prepared and deposited on carbon black (CB) loaded electrodes. These oxide nanoparticles showed high catalytic activities with high onset potentials of 0.96 VRHE (NbOx), 1.02 VRHE (ZrOx), and 0.93 V RHE (TaOx) for the ORR. Owing to the high chemical stability of group IV and V oxides, the catalysts were very stable during the ORR in acidic solutions. Surface characterization and chemical identification were performed using scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). All results clearly indicate the formation of nano-oxide electrocatalysts that show an outstanding ORR performance, whereas the bulk oxides are not active because of the absence of electronic conductivity. The present work demonstrates potential candidates for highly stable, non-noble-metal cathode catalysts for polymer electrolyte fuel cells (PEFCs), where the catalysts are exposed to highly acidic and oxidizing conditions. © 2013 American Chemical Society.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab; KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Core Labs; Catalysis for Energy Conversion (CatEC)
Publisher:
American Chemical Society (ACS)
Journal:
ACS Catalysis
Issue Date:
6-Sep-2013
DOI:
10.1021/cs400525u
Type:
Article
ISSN:
21555435
Sponsors:
This work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) of the Cabinet Office of Japan, the International Exchange Program of the A3 Foresight Program of the Japan Society for the Promotion of Science (JSPS), and the "Elements Strategy Initiative to Form Core Research Center" (since 2012), of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. One of authors, J.S., appreciates the support of the Global Centers of Excellence (GCOE) Program of JSPS for her work at the University of Tokyo.
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorSeo, Jeongsuken
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorTakanabe, Kazuhiroen
dc.contributor.authorKubota, Junen
dc.contributor.authorDomen, Kazunarien
dc.date.accessioned2015-08-03T11:17:32Zen
dc.date.available2015-08-03T11:17:32Zen
dc.date.issued2013-09-06en
dc.identifier.issn21555435en
dc.identifier.doi10.1021/cs400525uen
dc.identifier.urihttp://hdl.handle.net/10754/562971en
dc.description.abstractA remarkable electrocatalytic activity was obtained for the oxygen reduction reaction (ORR) in acidic solutions on ultrafine nano-oxide catalysts based on group IV or V elements. By potentiostatic electrodepostion in nonaqueous solutions at 298 K followed by heat treatment in H2 gas, highly dispersed fine nanoparticles of NbOx, ZrOx, and TaOx with sizes of less than 5 nm were prepared and deposited on carbon black (CB) loaded electrodes. These oxide nanoparticles showed high catalytic activities with high onset potentials of 0.96 VRHE (NbOx), 1.02 VRHE (ZrOx), and 0.93 V RHE (TaOx) for the ORR. Owing to the high chemical stability of group IV and V oxides, the catalysts were very stable during the ORR in acidic solutions. Surface characterization and chemical identification were performed using scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). All results clearly indicate the formation of nano-oxide electrocatalysts that show an outstanding ORR performance, whereas the bulk oxides are not active because of the absence of electronic conductivity. The present work demonstrates potential candidates for highly stable, non-noble-metal cathode catalysts for polymer electrolyte fuel cells (PEFCs), where the catalysts are exposed to highly acidic and oxidizing conditions. © 2013 American Chemical Society.en
dc.description.sponsorshipThis work was supported in part by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) of the Cabinet Office of Japan, the International Exchange Program of the A3 Foresight Program of the Japan Society for the Promotion of Science (JSPS), and the "Elements Strategy Initiative to Form Core Research Center" (since 2012), of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. One of authors, J.S., appreciates the support of the Global Centers of Excellence (GCOE) Program of JSPS for her work at the University of Tokyo.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectelectrodepositionen
dc.subjectNb2O5en
dc.subjectnonplatinum catalystsen
dc.subjectoxygen reduction reactionen
dc.subjectPEFCsen
dc.subjectTa2O5en
dc.subjectZrO2en
dc.titleElectrodeposited ultrafine NbOx, ZrOx, and TaO x nanoparticles on carbon black supports for oxygen reduction electrocatalysts in acidic mediaen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentCore Labsen
dc.contributor.departmentCatalysis for Energy Conversion (CatEC)en
dc.identifier.journalACS Catalysisen
dc.contributor.institutionDepartment of Chemical System Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japanen
dc.contributor.institutionElements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japanen
kaust.authorCha, Dong Kyuen
kaust.authorTakanabe, Kazuhiroen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.