Photoelectrocatalytic oxygen evolution reaction on visible-light irradiated W-doped alkali niobate-based perovskite

Author(s)

Praxedes, Fabiano R. ; Nobre, Marcos A. L. ; Olean-Oliveira, Andre ; Portugal, Miqueias L. ; Poon, Po S. ; Teixeira, Marcos F. S. ; Lanfredi, Silvania ; Matos, Juan

• Document type: Journal article
• Source: APPLIED CATALYSIS A-GENERAL; v. 659, p. 14-pg., 2023-04-12.

Abstract

The photoelectrocatalytic oxygen evolution reaction was studied under visible-light irradiated W-doped niobate-based perovskites. Nanostructured K0.5Na0.5(WxNb1_x)O3 materials were prepared by ultrasonic spray pyrolysis as a function of 1 - 3 mol% W6+ cations within the host structure. A careful characterization of solids including morphology, structure, texture, optical, and electrochemical properties was performed. From the characteriza-tion analysis it can be concluded the materials are constituted by nanostructured mesoporous hollow spheres and the substitution of Nb by W leads to the distortion of NbO6 octahedra. The photoelectrocatalytic activity was correlated with the structural properties and electrochemical properties of materials. To the best of our knowledge, the present W-doped niobate-based perovskites showed the highest turnover frequency reported in the photoelectrocatalytic OER under similar overpotential conditions. Accordingly, this new class of perovskite-based crystalline materials opens a door for the scaling-up of catalytic and photocatalytic processes related to energy production. (AU)

• FAPESP's process: 14/11189-0 - Catalytic performance as a function of nanostructuring of new oxides catalysts from the spray pyrolysis method
• Grantee: Silvania Lanfredi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/00781-6 - Heterostructures based on niobates for remediation of organic contaminants
• Grantee: Silvania Lanfredi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 07/03510-9 - Structural characterization of nanopowders of semiconductor ferroelectric oxides
• Grantee: Silvania Lanfredi
• Support Opportunities: Regular Research Grants