NiFe -layered double hydroxides (LDH) are fast, responsive oxygen evolution co-catalysts (OECs) for photoelectrochemical (PEC) water splitting due to their extraordinary photo charge carrier transport properties, easy modulation of defect states, and low preparation cost. However, in NiFe-LDH, major catalytic active sites are situated at the edge sites, and the oxygen evolution active sites are impeded by the close-packed basal planes. Hence, activating these basal planes to participate in water oxidation is ideal for improving water splitting efficiency. In the present study, we synthesized NiFe-LDH by cation-exchange (NiFe-CE) and activated the basal planes for an efficient water oxidation reaction. After depositing NiFe-CE on BiVO4 nanostructures and measuring their maximum photocurrent density of 4.03 mA/cm2 at 1.23 V vs. a reversible hydrogen electrode (RHE) under simulated solar light, the water oxidation efficiency was verified. Furthermore, their catalytic activity was compared with that of NiFe-LDH nanosheets synthesized through conventional techniques such as hydrothermal synthesis (NiFe-HT), solvothermal synthesis (NiFe-ST), and electrochemical deposition (NiFe-ED). The results demonstrated that NiFe-LDH derived through cation exchange exhibited higher catalytic activity than those that derived through other synthesis methods due to its abundance of catalytically active sites, high charge transport rate, and suitable water oxidation–reduction potentials. We hope that the present work provides a new way to activate catalytically active sites and facilitates the optimization of cost-effective, efficient, and durable oxygen evolution catalysts.
|Journal||Applied Surface Science|
|Publication status||Published - 2021 Dec 30|
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF), grants funded by the Ministry of Science and ICT (2016K1A4A4A01922028, 2020H1D3A1A02081461 and 2020R1A4A1017737). In addition, D.A.R. is greatly thankful to the DST, India, for awarding the Inspire Faculty Award.
This work was supported by the National Research Foundation of Korea (NRF), grants funded by the Ministry of Science and ICT ( 2016K1A4A4A01922028, 2020H1D3A1A02081461 and 2020R1A4A1017737 ). In addition, D.A.R. is greatly thankful to the DST, India, for awarding the Inspire Faculty Award.
© 2021 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films