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Carbon Nitride‐Based Photoanode with Enhanced Photostability and Water Oxidation Kinetics
Author(s) -
Karjule Neeta,
Singh Chanderpratap,
Barrio Jesús,
Tzadikov Jonathan,
Liberman Itamar,
Volokh Michael,
Palomares Emilio,
Hod Idan,
Shalom Menny
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101724
Subject(s) - materials science , oxygen evolution , photocurrent , water splitting , catalysis , graphitic carbon nitride , chemical engineering , oxide , reversible hydrogen electrode , electrochemistry , faraday efficiency , carbon nitride , quantum yield , nitride , electrolyte , graphene , carbon fibers , electron transfer , photocatalysis , electrode , photochemistry , nanotechnology , layer (electronics) , working electrode , chemistry , composite number , optoelectronics , composite material , engineering , biochemistry , quantum mechanics , metallurgy , fluorescence , physics
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.