Tunable Hydrogen Doping of Metal Oxide Semiconductors with Acid–Metal Treatment at Ambient Conditions
- 21 February 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 142 (9), 4136-4140
- https://doi.org/10.1021/jacs.0c00561
Abstract
Hydrogen doping of metal-oxide semiconductors is promising for manipulation of their properties towards various applications. Yet it is quite challenging because of harsh reaction conditions and expensive metal catalysts. Meanwhile, acids as a cheap source of protons have long been unappreciated. Here, we developed a sophisticated acid-metal treatment for tunable hydrogenation of metal-oxide at ambient condition. Using first-principle simulations, we first showed that with proper work function difference between metal and metal-oxide, the H diffusion into negatively charged metal-oxide can be well controlled, resulting in tunable hydrogen doping of metal-oxides with quasi-metal characteristics. This has been verified by proof-of-concept experiments that achieved the controllable hydrogenation of WO3 using Cu and hydrochloric acid at ambient conditions. Further, hydrogen doping of other metal oxides (TiO2/Nb2O5/MoO3) has been achieved by metal-acid treatment and induced change in properties. Our work provides a promising way of fine tailoring metal-oxide via tunable hydrogen doping.Funding Information
- Ministry of Science and Technology of the People's Republic of China (2017YFA0303500, 2018YFA0208603)
- National Natural Science Foundation of China (21633006)
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