Jimenéz-Calvo, P;
Naciri, Y;
Sobolewska, A;
Isaacs, M;
Zhang, Y;
Leforestier, A;
Degrouard, J;
... Paineau, E; + view all
(2023)
Ti-Modified Imogolite Nanotubes as Promising Photocatalyst 1D Nanostructures for H2 Production.
Small Methods
, Article e2301369. 10.1002/smtd.202301369.
(In press).
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Abstract
Imogolite nanotubes (INTs) are predicted as a unique 1D material with spatial separation of conduction and valence band edges but their large band gaps have inhibited their use as photocatalysts. The first step toward using these NTs in photocatalysis and exploiting the polarization-promoted charge separation across their walls is to reduce their band gap. Here, the modification of double-walled aluminogermanate INTs by incorporation of titanium into the NT walls is explored. The precursor ratio x = [Ti]/([Ge]+[Ti]) is modulated between 0 and 1. Structural and optical properties are determined at different scales and the photocatalytic performance is evaluated for H2 production. Although the incorporation of Ti atoms into the structure remains limited, the optimal condition is found around x = 0.4 for which the resulting NTs reveal a remarkable hydrogen production of ≈1500 µmol g−1 after 5 h for a noble metal-free photocatalyst, a 65-fold increase relative to a commercial TiO2-P25. This is correlated to a lowering of the recombination rate of photogenerated charge carriers for the most active structures. These results confirm the theoretical predictions regarding the potential of modified INTs as photoactive nanoreactors and pave the way for investigating and exploiting their polarization properties for energy applications.
| Type: | Article |
|---|---|
| Title: | Ti-Modified Imogolite Nanotubes as Promising Photocatalyst 1D Nanostructures for H2 Production |
| Location: | Germany |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/smtd.202301369 |
| Publisher version: | http://dx.doi.org/10.1002/smtd.202301369 |
| Language: | English |
| Additional information: | © 2023 The Authors. Small Methods published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
| Keywords: | hydrogen, multi-scale analysis, nanotube, photocatalysis, polarization |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10184249 |
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