Non-catalytic hydrogenation of VO2 in acid solution

Yuliang Chen, Zhaowu Wang, Shi Chen, Hui Ren, Liangxin Wang, Guobin Zhang, Yalin Lu, Jun Jiang (), Chongwen Zou () and Yi Luo
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Yuliang Chen: University of Science and Technology of China
Zhaowu Wang: University of Science and Technology of China
Shi Chen: University of Science and Technology of China
Hui Ren: University of Science and Technology of China
Liangxin Wang: University of Science and Technology of China
Guobin Zhang: University of Science and Technology of China
Yalin Lu: University of Science and Technology of China
Jun Jiang: University of Science and Technology of China
Chongwen Zou: University of Science and Technology of China
Yi Luo: University of Science and Technology of China

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Hydrogenation is an effective way to tune the property of metal oxides. It can conventionally be performed by doping hydrogen into solid materials with noble-metal catalysis, high-temperature/pressure annealing treatment, or high-energy proton implantation in vacuum condition. Acid solution naturally provides a rich proton source, but it should cause corrosion rather than hydrogenation to metal oxides. Here we report a facile approach to hydrogenate monoclinic vanadium dioxide (VO2) in acid solution at ambient condition by placing a small piece of low workfunction metal (Al, Cu, Ag, Zn, or Fe) on VO2 surface. It is found that the attachment of a tiny metal particle (~1.0 mm) can lead to the complete hydrogenation of an entire wafer-size VO2 (>2 inch). Moreover, with the right choice of the metal a two-step insulator–metal–insulator phase modulation can even be achieved. An electron–proton co-doping mechanism has been proposed and verified by the first-principles calculations.

Date: 2018
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DOI: 10.1038/s41467-018-03292-y

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