| Cuprous oxide (Cu2O), a p-type body-center-cube (bcc) structural semiconductor with a direct band gap of 2.1eV, has abundant morphorlogy which are composed by different facets and provides unique opportunities for the examination of facet-specific properties in photocatalysis performance. After crystal cutting, the photoexcited electrons accumulate on the Cu2O octahedral{111} facets under light irradiation to provide an abundant source of electrons, which exhibits a stronger photocatalysis performance than{100} facets. However, Cu2O is unstable in the process of photodegradation and easy to be oxided to form CuO by the strong oxidant, which decreases the photocatalysis performance. So, how to make full use of the electorns accumulated on the Cu2O{111} facets efficiently and prevent it from being oxided by the strong oxidants is the key question.Graphene is a kind of zero bandgap two-dimentional material, which plays an important role in nano-composite material. In this paper, we use the reduced graphene oxide (rGO) as the protecting material. Poly allylamine hydrochloride (PAH) is used to encapsulate Cu2O polyhedrons by rGO efficiently to form rGO-Cu2O polyhedron composites. We observe that a perfect contact is established between Cu2O polyhedrons and rGO through TEM and SEM observations. After being encapsulated by rGO, rGO/octahedrons shows an increased photocatalysis performance markedly, meanwhile it also shows a good stability of the photodegradation performance. As a result, the photoexcited electrons accumulate on the Cu2O octahedron{111} facets under light irradiation to provide an abundant source of electrons after crystal cutting. Electrons can transfer to rGO that serves as a flexible conducting channel, which promots the increase of photocatalysis performance. In one word, we use an effective mean to make full use of the electorns accumulated on the Cu2O{111} facets efficiently and prevent it from being oxided, that reaches our purpose. |
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