Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15457
Title: Highly mobile and reactive state of hydrogen in metal oxide semiconductors at room temperature
Authors: Chen, WP
He, KF
Wang, Y 
Chan, HLW 
Yan, Z
Issue Date: 2013
Publisher: Nature Publishing Group
Source: Scientific reports, 2013, v. 3, 3149 How to cite?
Journal: Scientific reports 
Abstract: Hydrogen in metal oxides usually strongly associates with a neighboring oxygen ion through an O-H bond and thus displays a high stability. Here we report a novel state of hydrogen with unusually high mobility and reactivity in metal oxides at room temperature. We show that freshly doped hydrogen in Nb 2 O 5 and WO 3 polycrystals via electrochemical hydrogenation can reduce Cu 2+ ions into Cu 0 if the polycrystals are immersed in a CuSO 4 solution, while this would not happen if the hydrogenated polycrystals have been placed in air for several hours before the immersion. Time-dependent studies of electrochemically hydrogenated rutile single crystals reveal two distinct states of hydrogen: one as protons covalently bonded to oxygen ions, while the other one is highly unstable with a lifetime of just a few hours. Observation of this mobile and reactive state of hydrogen will provide new insight into numerous moderate and low temperature interactions between metal oxides and hydrogen.
URI: http://hdl.handle.net/10397/15457
EISSN: 2045-2322
DOI: 10.1038/srep03149
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