Direct growth of uniform carbon nitride layers with extended optical absorption towards efficient water-splitting photoanodes

Jiani Qin, Jesús Barrio, Guiming Peng, Jonathan Tzadikov, Liel Abisdris, Michael Volokh, Menny Shalom

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

A general synthesis of carbon nitride (CN) films with extended optical absorption, excellent charge separation under illumination, and outstanding performance as a photoanode in water-splitting photoelectrochemical cells is reported. To this end, we introduced a universal method to rapidly grow CN monomers directly from a hot saturated solution on various substrates. Upon calcination, a highly uniform carbon nitride layer with tuned structural and photophysical properties and in intimate contact with the substrate is obtained. Detailed photoelectrochemical and structural studies reveal good photoresponse up to 600 nm, excellent hole extraction efficiency (up to 62%) and strong adhesion of the CN layer to the substrate. The best CN photoanode demonstrates a benchmark-setting photocurrent density of 353 µA cm−2 (51% faradaic efficiency for oxygen), and external quantum yield value above 12% at 450 nm at 1.23 V versus RHE in an alkaline solution, as well as low onset potential and good stability.

Original languageEnglish
Article number4701
JournalNature Communications
Volume11
Issue number1
DOIs
StatePublished - 1 Dec 2020

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy

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