2026-04-17T01:11:08Zhttps://recercat.cat/oai/requestoai:recercat.cat:2072/5277042024-12-20T22:52:18Zcom_2072_300912com_2072_4427col_2072_301309
RECERCAT
author
Karjule, Neeta
author
Singh, Chanderpratap
author
Barrio, Jesús
author
Tzadikov, Jonathan
author
Liberman, Itamar
author
Volokh, Michael
author
Palomares, Emilio
author
Hod, Idan
author
Shalom, Menny
2022-12-07T12:43:44Z2024-04-23T11:00:04Z
2022-12-07T12:43:44Z2024-04-23T11:00:04Z
2021-04-10
http://hdl.handle.net/2072/527704
https://doi.org/10.1002/adfm.202101724
Carbon nitrides (CN) have emerged as promising photoanode materials for water-splitting photoelectrochemical cells (PECs). However, their poor charge separation and transfer properties, together with slow water-oxidation kinetics, have resulted in low PEC activity and instability, which strongly impede their further development. In this work, these limitations are addressed by optimizing the charge separation and transfer process. To this end, a nickel–iron based metal-organic framework, Ni/Fe-MIL-53, is deposited, that acts as an oxygen evolution pre-catalyst within the CN layer and incorporate reduced graphene oxide as an electron acceptor. Upon electrochemical activation, a uniform distribution of highly active oxygen evolution reaction (OER) catalysts is obtained on the porous CN surface. Detailed mechanistic studies reveal excellent hole extraction properties with high OER catalytic activity (83% faradaic efficiency) and long-term stability, up to 35 h. These results indicate that the decrease in performance is mainly due to the slow leaching of the catalyst from the CN layer. The CN photoanode exhibits a reproducible photocurrent density of 472 ± 20 µA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m KOH, an exceptionally low onset potential of ≈0.034 V versus RHE, and high external quantum yield.
eng
Attribution-NonCommercial-NoDerivatives 4.0 International License.This license is permanently located athttp://creativecommons.org/licenses/by-nc-nd/4.0/.
Carbon nitride-based photoanode with enhanced photostability and water oxidation kinetics
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https://recercat.cat/bitstream/2072/527704/1/Adv%20Func%20Mater_2021_31_2101724.pdf
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Adv Func Mater_2021_31_2101724.pdf
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https://recercat.cat/bitstream/2072/527704/2/Adv%20Func%20Mater_2021_31_2101724.pdf.txt
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Adv Func Mater_2021_31_2101724.pdf.txt