Beware of Doping: Ta2O5 Nanotube Photocatalyst Using CNTs as Hard Templates

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Cherevan A, Gebhardt P, Kunzmann A, Costa RD, Eder D
Zeitschrift: ACS Applied Energy Materials
Jahr der Veröffentlichung: 2018
Band: 1
Heftnummer: 3
Seitenbereich: 1259-1267
ISSN: 2574-0962


Abstract

Nanostructuring constitutes a promising strategy to increase efficiency and stability of contemporary photocatalysts. Here, we report on the synthesis of highly crystalline Ta2O5 nanotubes (NTs) by using carbon nanotubes (CNTs) as sacrificial hard templates and elucidate the role of residual Fe nanoparticles-often used as catalyst for the CNT growth-on their photocatalytic performance toward H-2 evolution. We show that, when using as grown CNTs, the resulting Ta2O5 NTs contained detectable amounts of Fe and possessed negligible photocatalytic activity. When CNTs were, however, purified from Fe by thermally annealing the CNTs at 2100 degrees C, the same synthetic procedure yielded pure Ta2O5 NTs that showed a 40-fold increase in activity compared to the Fe-containing counterpart. A complementary set of analytical techniques in a combination with additional model experiments indicate that the detrimental effect of the residual Fe on the photocatalytic activity originates from atomic doping and formation of a segregated FeOx phase within the Ta2O5 matrix that can both act as efficient electron traps. Our result highlights that the presence of residual catalyst needs to be taken into account when using CNTs as hard templates and generally illustrates a possible effect of unintentional dopants that are often not considered in preparing functional nanostructures.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Kunzmann, Andreas
Lehrstuhl für Physikalische Chemie I


Einrichtungen weiterer Autorinnen und Autoren

Fraunhofer-Institut für Solare Energiesysteme (ISE) / Fraunhofer Institute for Solar Energy Systems
Fundación IMDEA Instituto Madrileño de Estudios Avanzados
Technische Universität Wien


Zitierweisen

APA:
Cherevan, A., Gebhardt, P., Kunzmann, A., Costa, R.D., & Eder, D. (2018). Beware of Doping: Ta2O5 Nanotube Photocatalyst Using CNTs as Hard Templates. ACS Applied Energy Materials, 1(3), 1259-1267. https://dx.doi.org/10.1021/acsaem.8b00006

MLA:
Cherevan, Alexey, et al. "Beware of Doping: Ta2O5 Nanotube Photocatalyst Using CNTs as Hard Templates." ACS Applied Energy Materials 1.3 (2018): 1259-1267.

BibTeX: 

Zuletzt aktualisiert 2019-01-03 um 22:08