Abstract
In this paper, nanocone-assembled hedgehog-like SnO2 was synthesized via a facile hydrothermal process. Once under UV irradiation, the response of the as-prepared 3D SnO2 towards 100ppm H2 at low temperature (50°C) was improved almost 3.5 times (S=9.5) over that in dark. The enhancement may be attributed to the co-effect from three aspects: (1) the heavy electron depletion induced by oxygen chemisorption due to the Debye length scale dimensions of nanocones; (2) vast reaction sites and sufficient diffusion spaces provided by the 1D–3D configuration; (3) the possibility that the refreshed photoinduced oxygen ions on the surface of SnO2 are more energetic than chemisorbed oxygen ions and promote the photo-catalytic reaction of H2 even at low temperature.
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