Highly dispersed TaOx nanoparticles prepared by electrodeposition as oxygen reduction electrocatalysts for polymer electrolyte fuel cells

Handle URI:
http://hdl.handle.net/10754/562804
Title:
Highly dispersed TaOx nanoparticles prepared by electrodeposition as oxygen reduction electrocatalysts for polymer electrolyte fuel cells
Authors:
Seo, Jeongsuk; Zhao, Lan; Cha, Dong Kyu; Takanabe, Kazuhiro ( 0000-0001-5374-9451 ) ; Katayama, Masao; Kubota, Jun; Domen, Kazunari
Abstract:
Based on the chemical stability of group IV and V elements in acidic solutions, TaOx nanoparticles prepared by electrodeposition in an ethanol-based Ta plating bath at room temperature were investigated as novel nonplatinum electrocatalysts for the oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs). Electrodeposition conditions of Ta complexes and subsequent various heat treatments for the deposited TaOx were examined for the best performance of the ORR. TaOx particles on carbon black (CB), electrodeposited at a constant potential of -0.5 V Ag/AgCl for 10 s and then heat-treated by pure H2 flow at 523 K for 1 h, showed excellent catalytic activity with an onset potential of 0.93 VRHE (for 2 μA cm-2) for the ORR. Surface characterizations of the catalysts were performed by scanning transmission electron microscopy (STEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The loading amounts of the electrodeposited material on the CB were determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). All the physical results suggested that high dispersion of TaOx particles on the CB surface with 2-3 nm size was critical and key for high activity. The chemical identity and modified surface structure for the deposited TaOx catalysts before and after H 2 heat treatment were analyzed by X-ray photoelectron spectroscopy (XPS). The formation of more exposed active sites on the electrode surface and enhanced electroconductivity of the tantalum oxide promoted from the H 2 treatment greatly improved the ORR performance of the electrodeposited TaOx nanoparticles on CB. Finally, the highly retained ORR activity after an accelerated durability test in an acidic solution confirmed and proved the chemical stability of the oxide nanoparticles. The high utilization of the electrodeposited TaOx nanoparticles uniformly dispersed on CB for the ORR was comparable to that of commercial Pt/CB catalysts, visually demonstrating their catalytic potential for PEFC electrocatalysts. © 2013 American Chemical Society.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab; Biological and Environmental Sciences and Engineering (BESE) Division; 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:
The Journal of Physical Chemistry C
Issue Date:
6-Jun-2013
DOI:
10.1021/jp4013703
Type:
Article
ISSN:
19327447
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 and "Elements Strategy Initiative for Catalysts & Batteries (ESICB)" supported by the MEXT program "Elements Strategy Initiative to Form Core Rersearch Center" (since 2012) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work also contributes the international exchange program of the A3 Foresight Program of the Japan Society for the Promotion of Science (JSPS). One of authors, Seo, 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); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSeo, Jeongsuken
dc.contributor.authorZhao, Lanen
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorTakanabe, Kazuhiroen
dc.contributor.authorKatayama, Masaoen
dc.contributor.authorKubota, Junen
dc.contributor.authorDomen, Kazunarien
dc.date.accessioned2015-08-03T11:10:51Zen
dc.date.available2015-08-03T11:10:51Zen
dc.date.issued2013-06-06en
dc.identifier.issn19327447en
dc.identifier.doi10.1021/jp4013703en
dc.identifier.urihttp://hdl.handle.net/10754/562804en
dc.description.abstractBased on the chemical stability of group IV and V elements in acidic solutions, TaOx nanoparticles prepared by electrodeposition in an ethanol-based Ta plating bath at room temperature were investigated as novel nonplatinum electrocatalysts for the oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs). Electrodeposition conditions of Ta complexes and subsequent various heat treatments for the deposited TaOx were examined for the best performance of the ORR. TaOx particles on carbon black (CB), electrodeposited at a constant potential of -0.5 V Ag/AgCl for 10 s and then heat-treated by pure H2 flow at 523 K for 1 h, showed excellent catalytic activity with an onset potential of 0.93 VRHE (for 2 μA cm-2) for the ORR. Surface characterizations of the catalysts were performed by scanning transmission electron microscopy (STEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The loading amounts of the electrodeposited material on the CB were determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). All the physical results suggested that high dispersion of TaOx particles on the CB surface with 2-3 nm size was critical and key for high activity. The chemical identity and modified surface structure for the deposited TaOx catalysts before and after H 2 heat treatment were analyzed by X-ray photoelectron spectroscopy (XPS). The formation of more exposed active sites on the electrode surface and enhanced electroconductivity of the tantalum oxide promoted from the H 2 treatment greatly improved the ORR performance of the electrodeposited TaOx nanoparticles on CB. Finally, the highly retained ORR activity after an accelerated durability test in an acidic solution confirmed and proved the chemical stability of the oxide nanoparticles. The high utilization of the electrodeposited TaOx nanoparticles uniformly dispersed on CB for the ORR was comparable to that of commercial Pt/CB catalysts, visually demonstrating their catalytic potential for PEFC electrocatalysts. © 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 and "Elements Strategy Initiative for Catalysts & Batteries (ESICB)" supported by the MEXT program "Elements Strategy Initiative to Form Core Rersearch Center" (since 2012) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work also contributes the international exchange program of the A3 Foresight Program of the Japan Society for the Promotion of Science (JSPS). One of authors, Seo, 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.titleHighly dispersed TaOx nanoparticles prepared by electrodeposition as oxygen reduction electrocatalysts for polymer electrolyte fuel cellsen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
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.journalThe Journal of Physical Chemistry Cen
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
kaust.authorZhao, Lanen
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