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Two-electron transfer mechanism from 3D/3D nickel selenide/MoS2 heterostructure accelerates photocatalytic hydrogen evolution and tetracycline hydrochloride removal by Jia Jia; Lisi Zheng; Keke Li; Yating Zhang; Haijiao Xie is a Engineering article available to read on EtoBox.

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Establishing highly effective charge transfer channels and providing adequate active sites for improving the activity of photocatalyst is still a challenging issue. Herein, a novel marigold-like NiSe 2 /MoS 2 hierarchical heterostructure is firstly reported via in situ deposition of mesoscale hedgehog NiSe 2 nanoparticles on the nanosheet edge of MoS 2 flowerspheres. The optimal 5.4% NiSe 2 /MoS 2 composite exhibits moderate hydrogen evolution rate of 2473.7 μmol⋅h -1 ⋅g -1 without any noble metal cocatalysts and achieves mineralization capacity for tetracycline hydrochloride (58.1%) after 120 min, respectively. The transfer pathway of photogenerated charge carriers, the generation process and function of different reactive oxygen species (⋅O 2 -, ⋅OH, 1 O 2 and H 2 O 2 ) are detailedly discussed. Based on the results of various characterizations and DFT calculations, the improvement of photocatalytic performance could be derived from the unique morphology effect with numerous reactive sites and extended light harvesting ability, as well as the type-II heterojunction with promoted photocarriers separation efficiency and lower interfacial migration impedance, which arose from a cont

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Author

Jia Jia; Lisi Zheng; Keke Li; Yating Zhang; Haijiao Xie

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)