Abstract
• In-situ construction of recyclable “nature-inspired biomimetic photocatalyst”. • TiO 2 /g-C 3 N 4 NAs exhibited enhanced photocatalytic CO 2 reduction performance. • Intimate interfacial contact is beneficial to the photogenerated charge transfer. • In-situ irradiated XPS measurements investigation on S-scheme mechanism. Preparation of efficient photocatalysts with ease of recovery in solar fuel generation is highly desired to achieve carbon neutralization in carbon dioxide (CO 2 ) emissions. Inspired from the forest with superior light penetration and fast gas transport, a TiO 2 /g-C 3 N 4 composite nanowire arrays (NAs) film with maximized light utilization is devised. It is achieved by in-situ coating a thin layer of g-C 3 N 4 (as the leaf) on the vertically-oriented TiO 2 arrays (as tree trunks) on Ti foil (as soil). Benefiting from the effective charge separation by S-scheme charge transfer, intimate contact by the in-situ growth as well as the ingenious structure, the composite, readily recyclable, displays exciting performance in photocatalytic CO 2 reduction. It is beyond doubt that the combination of heterojunction construction and “nature-inspired biomimetic photocatalyst” design promises practical applications and industrial use.
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