Grey facet-controlled anatase nanosheets for photocatalytic H2 evolution without co-catalyst

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Abstract

Recently, black and grey titania in various morphologies have been intensively investigated for their high performance in photocatalytic H2 generation. Here we use titania nanosheets (NSs) with a large percentage of (001) facets and hydrogenate them to activate suitable Ti3+-Ov defects for co-catalyst free H2 generation. Key to a highly active NS-catalyst is the prevention of serious deformation and sintering during the thermal hydrogenation. In this work, we present a systematic investigation of different thermally treated NSs characterized by scanning electron microscope, high resolution-Transmission electron microscopy, TEM-energy-dispersive x-ray, x-ray diffraction, electron paramagnetic response, x-ray photoelectron spectroscopy, and photocatalytic H2 evolution performance. We describe how to achieve robust grey NSs with an intact two-dimensional shape that can endure hydrogenation at the required high temperatures. Due to a defined faceting, these optimized grey NSs can produce photocatalytic H2 at a higher rate than previously reported best performing grey nanoparticles-This in spite of having a lower Brunauer Emmett Teller than the reduced nanoparticles.

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Qin, S., Kim, H., Denisov, N., Fehn, D., Schmidt, J., Meyer, K., & Schmuki, P. (2021). Grey facet-controlled anatase nanosheets for photocatalytic H2 evolution without co-catalyst. JPhys Energy, 3(3). https://doi.org/10.1088/2515-7655/abd5a8

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