Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 42, Pages 21308-21313Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta04964d
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Funding
- Natural Science Foundation of Guangdong Province [2014A030313521, 2014A030313529]
- Guangdong Natural Science Foundation for Distinguished Young Scholar [2014A030306048]
- National Natural Science Foundations of China [21276054, U1401246, 21376056]
- Yang-cheng Scholars Foundation of Guangzhou [12A002D]
- Research Fund Program of Guangzhou Key chemical engineering and technology
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Hydrogenated TiO2/MnOx nanowires (NWs) with a diameter of 50-80 nm and a length of 0.5-0.8 mm 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 O-2 evolution occurs during the OER in alkaline media at pH >= 9.
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