Issue 15, 2022

An efficient strategy to boost the directed migration of photogenerated holes by introducing phthalocyanine as a hole extraction layer

Abstract

Although the sluggish water oxidation kinetics could be optimized by the decoration of cocatalysts, the transport of photogenerated charges in the bulk photoanodes is still a critical bottleneck in cocatalyst modified semiconductor photoanodes. Herein, we have firstly proposed the concept of modulating the photogenerated charge migration in the bulk photoanode by inserting phthalocyanine as the hole extraction layer between the semiconductor (Ti-Fe2O3) and the cocatalyst (CoPi). Benefitting from the gradient band structure of Ti-Fe2O3, metal-free 2,3,9,10,16,17,23,24-octacarboxy phthalocyanine (H2Pc(COOH)8) and CoPi, as well as the coplanar binding mode of Ti-Fe2O3 and H2Pc(COOH)8, the photogenerated holes of Ti-Fe2O3 would be migrated directionally to CoPi through H2Pc(COOH)8, hence more photogenerated holes arrive at CoPi and participate in the water oxidation reaction. As expected, the triphasic photoanode (CoPi/Pc/Ti-Fe2O3) exhibits not only a higher photocurrent density but also a more negative onset potential than CoPi/Ti-Fe2O3.

Graphical abstract: An efficient strategy to boost the directed migration of photogenerated holes by introducing phthalocyanine as a hole extraction layer

Supplementary files

Article information

Article type
Research Article
Submitted
03 Кві 2022
Accepted
11 Чер 2022
First published
13 Чер 2022

Inorg. Chem. Front., 2022,9, 3915-3923

An efficient strategy to boost the directed migration of photogenerated holes by introducing phthalocyanine as a hole extraction layer

Q. Bu, Q. Zhao, G. Lu, X. Zhu, Y. Zhang, T. Xie, Q. Liu and J. Jiang, Inorg. Chem. Front., 2022, 9, 3915 DOI: 10.1039/D2QI00701K

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