Z‐Scheme 2D/2D Heterojunction of Black Phosphorus/Monolayer Bi2WO6 Nanosheets with Enhanced Photocatalytic Activities

A Z‐scheme heterojunction of 2D/2D black phosphorus/monolayer Bi₂WO₆ was fabricated with enhanced photocatalytic performance under visible light irradiation. The highest NO removal ratio was up to 67 % and the H₂ evolution ratio 21 042 μmol g⁻¹. The black phosphorus nanosheets can be used for photocatalytic degradation of exhaust gases in air.

Abstract

Black phosphorus (BP), a star‐shaped two‐dimensional material, has attracted considerable attention owing to its unique chemical and physical properties. BP shows great potential in photocatalysis area because of its excellent optical properties; however, its applications in this field have been limited to date. Now, a Z‐scheme heterojunction of 2D/2D BP/monolayer Bi₂WO₆ (MBWO) is fabricated by a simple and effective method. The BP/MBWO heterojunction exhibits enhanced photocatalytic performance in photocatalytic water splitting to produce H₂ and NO removal to purify air; the highest H₂ evolution rate of BP/MBWO is 21042 μmol g⁻¹, is 9.15 times that of pristine MBWO and the NO removal ratio was as high as 67 %. A Z‐scheme photocatalytic mechanism is proposed based on monitoring of ^.O₂⁻, ^.OH, NO₂, and NO₃⁻ species in the reaction. This work broadens applications of BP and highlights its promise in the treatment of environmental pollution and renewable energy issues.

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