Electrochemically Faceted Bamboo‐type TiO2 Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Ji L, Zhou X, Schmuki P
Zeitschrift: ChemElectroChem
Jahr der Veröffentlichung: 2019
Band: 6
Heftnummer: 1
Seitenbereich: 114-120
ISSN: 2196-0216


Abstract

In this paper we prepare facetted “black” TiO
2
nanotube arrays (NTAs) with a bamboo-type structure which exhibits an enhanced performance for open-circuit H
2
generation without the use of any noble metal co-catalyst. The TiO
2
nanotubes were formed by applying alternating positive and negative voltages. During the electrochemical formation, not only a bamboo structure is formed but the tubes are reduced in the cathodic cycle. After a rapid annealing treatment of these tubes in air at 500 °C for 10 s, the bamboo rings (knots) provide (001) facets preferentially located at the knot, while (101) planes prevail on the smooth part of tube between knots, as shown by TEM. The short annealing time keeps Ti
3+
/oxygen vacancies (V
O
) as co-catalytically active centers still preserved in the TiO
2
NTAs. The results of intensity modulated photocurrent spectroscopy (IMPS) and open-circuit potential decay measurements (V
OC
) indicate that these faceted and reduced TiO
2
nanotube arrays provide an efficient separation and reaction of photo-generated charge carriers, leading to an improved photocatalytic H
2
evolution performance.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Ji, Lei Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Schmuki, Patrik Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)
Zhou, Xuemei
Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)


Zitierweisen

APA:
Ji, L., Zhou, X., & Schmuki, P. (2019). Electrochemically Faceted Bamboo‐type TiO2 Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution. ChemElectroChem, 6(1), 114-120. https://dx.doi.org/10.1002/celc.201800584

MLA:
Ji, Lei, Xuemei Zhou, and Patrik Schmuki. "Electrochemically Faceted Bamboo‐type TiO2 Nanotubes Provide Enhanced Open‐Circuit Hydrogen Evolution." ChemElectroChem 6.1 (2019): 114-120.

BibTeX: 

Zuletzt aktualisiert 2019-21-07 um 07:52