Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 41, Pages 13613-13617Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201807647
Keywords
crystal morphology; cuprous oxide; hydrogen evolution reaction; photocatalysis; photooxidation
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Funding
- Australian Research Council [DP180102540]
- UNSW Mark Wainwright Analytical Centre
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Cuprous Oxide (Cu2O) is a photocatalyst with severe photocorrosion issues. Theoretically, it can undergo both self-oxidation (to form copper oxide (CuO)) and self-reduction (to form metallic copper (Cu)) upon illumination with the aid of photoexcited charges. There is, however, limited experimental understanding of the dominant photocorrosion pathway. Both photocorrosion modes can be regulated by tailoring the conditions of the photocatalytic reactions. Photo-oxidation of Cu2O (in the form of a suspension system), accompanied by corroded morphology, is kinetically favourable and is the prevailing deactivation pathway. With knowledge of the dominant deactivation mode of Cu2O, suppression of self-photooxidation together with enhancement in its overall photocatalytic performance can be achieved after a careful selection of sacrificial hole (h(+)) scavenger. In this way, stable hydrogen (H-2) production can be attained without the need for deposition of secondary components.
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