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 and Menny Shalom ()
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Jiani Qin: Ben-Gurion University of the Negev
Jesús Barrio: Ben-Gurion University of the Negev
Guiming Peng: Ben-Gurion University of the Negev
Jonathan Tzadikov: Ben-Gurion University of the Negev
Liel Abisdris: Ben-Gurion University of the Negev
Michael Volokh: Ben-Gurion University of the Negev
Menny Shalom: Ben-Gurion University of the Negev

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-18535-0

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