Issue 42, 2015

Manganese oxides supported on hydrogenated TiO2 nanowire array catalysts for the electrochemical oxygen evolution reaction in water electrolysis

Abstract

Hydrogenated TiO2/MnOx nanowires (NWs) with a diameter of 50–80 nm and a length of 0.5–0.8 μm supported on carbon cloth have been successfully prepared. The entire surface of the H–TiO2 NWs is covered uniformly by amorphous MnOx with an average thickness of 7.0 nm. The H–TiO2 NWs are poorly active for the oxygen evolution reaction (OER) and the MnOx as a major potential feasible electrocatalyst shows a considerable activity. The onset potential shifts negatively and the current density improves not only by the enlarged surface area of the MnOx support on the H–TiO2 NWs, but also by a synergistic effect between TiO2 and MnOx. The presence of three manganese oxides with different valences such as MnO, Mn2O3 and MnO2 in the H–TiO2/MnOx NWs is apt to effect the OER due to electron transfer. The percentage of Mn2+ increases and the percentages of Mn3+ and Mn4+ decrease after the test, which proves the assumption that Mn4+ is first reduced to Mn3+ by electron injection from H2O, and then Mn3+ is further reduced to Mn2+ when the O2 evolution occurs during the OER in alkaline media at pH ≥ 9.

Graphical abstract: Manganese oxides supported on hydrogenated TiO2 nanowire array catalysts for the electrochemical oxygen evolution reaction in water electrolysis

Article information

Article type
Paper
Submitted
03 Jul 2015
Accepted
28 Aug 2015
First published
02 Sep 2015

J. Mater. Chem. A, 2015,3, 21308-21313

Author version available

Manganese oxides supported on hydrogenated TiO2 nanowire array catalysts for the electrochemical oxygen evolution reaction in water electrolysis

N. Li, W. Xia, J. Wang, Z. Liu, Q. Li, S. Chen, C. Xu and X. Lu, J. Mater. Chem. A, 2015, 3, 21308 DOI: 10.1039/C5TA04964D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements