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Unique layer‐doping‐induced regulation of charge behavior in metal‐free carbon nitride photoanodes for enhanced performance

journal contribution
posted on 2020-01-19, 00:00 authored by P Luan, Q Meng, J Wu, Q Li, X Zhang, Y Zhang, Luke O'DellLuke O'Dell, S R Raga, Jenny PringleJenny Pringle, J C Griffith, C Sun, U Bach, J Zhang
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Photoinduced charge carrier behavior is critical in determining photoelectrocatalytic activity. In this study, a unique layer-doped metal-free polymeric carbon nitride (C3N4) photoanode is fabricated by using one-pot thermal vapor deposition. With this method, a photoanode consisting of a phosphorus-doped top layer, boron-doped middle layer, and pristine C3N4 bottom layer, was formed as a result of the difference in thermal polymerization kinetics associated with the boron-containing H3BO3–melamine complex and the phosphorus-containing H3PO4–dicyandiamide complex. This layer-doping fabrication strategy effectively contributes to the formation of dual junctions that optimizing charge carrier behavior. The ternary-layer C3N4 photoanode exhibits significantly enhanced photoelectrochemical water oxidation activity compared to pristine C3N4, with a record photocurrent density of 150±10 μA cm−2 at 1.23 V vs. RHE. This layer-doping strategy provides an effective means for design and fabrication of photoelectrodes for solar water oxidation.

History

Journal

ChemSusChem

Volume

13

Issue

2

Pagination

328 - 333

Publisher

Wiley

Location

London, Eng.

ISSN

1864-5631

eISSN

1864-564X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim