We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Carbon Nitride‐Based Photoanode with Enhanced Photostability and Water Oxidation Kinetics.
- Authors
Karjule, Neeta; Singh, Chanderpratap; Barrio, Jesús; Tzadikov, Jonathan; Liberman, Itamar; Volokh, Michael; Palomares, Emilio; Hod, Idan; Shalom, Menny
- Abstract
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.
- Subjects
OXIDATION kinetics; CATALYSTS; OXIDATION of water; OXYGEN evolution reactions; PHOTOELECTROCHEMISTRY; PHOTOELECTROCHEMICAL cells; STANDARD hydrogen electrode; CHARGE transfer
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 25, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202101724