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Construction of Co9Se8/TiO2 S‐scheme heterojunction photocatalyst for efficient hydrogen production by Meiling Zhang; Fangli Zhao; Keting Feng; Xiaoyun Hu; Jun Fan; Tao Sun; Enzhou Liu is a Materials Science article available to read on EtoBox.

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Construction of S-scheme heterostructure is the focus of catalyst modification in the field of photocatalysis. In this work, the nanosized Co9Se8 and TiO2 particles were fabricated via a simple hydrothermal process. A series of Co9Se8/TiO2 heterojunctions were subsequently constructed through a physical solvent evaporation strategy. The photocatalytic H2 evolution experiment shows that the H2 evolution rate can reach 8282.7 μmol·g−1·h−1 over 15 %-Co9Se8/TiO2 under 300 W Xe lamp irradiation using 20 % triethanolamine (TEOA) as the sacrifice agent, which is 29.9-fold and 95.8-fold higher than that of pristine TiO2 (277.3 μmol·g−1 ·h−1) and Co9Se8 (86.5 μmol·g−1 ·h−1), respectively. The enhanced photocatalytic performance is primarily attributed to the improved light absorption ability and the formed S-scheme heterojunctions between TiO2 and Co9Se8, which could efficiently accelerate the separation and migration of photo-induced charges. Furthermore, the powerful electrons and holes are preserved, thereby earned robust redox ability to prompt H2 evolution reaction. This work affords a feasible approach to obtain S-scheme photocatalysts for effectively converting solar energy to H2.

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Author

Meiling Zhang; Fangli Zhao; Keting Feng; Xiaoyun Hu; Jun Fan; Tao Sun; Enzhou Liu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)