Beware of Doping: Ta2O5 Nanotube Photocatalyst Using CNTs as Hard Templates
| Autor: | Alexey Cherevan, Dominik Eder, Rubén D. Costa, Paul Gebhardt, Andreas Kunzmann |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Nanotube
Materials science Annealing (metallurgy) Doping Energy Engineering and Power Technology 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention Template Chemical engineering law Materials Chemistry Electrochemistry Photocatalysis Chemical Engineering (miscellaneous) Electrical and Electronic Engineering 0210 nano-technology Sol-gel |
| Zdroj: | ACS Applied Energy Materials. 1:1259-1267 |
| ISSN: | 2574-0962 |
| DOI: | 10.1021/acsaem.8b00006 |
| Popis: | 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 H2 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 °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 segreg... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|