Type: Article

Multifunctional approach to improve water oxidation performance with MOF-based photoelectrodes

Journal: Applied Materials Today (23529415)Year: September 2021Volume: 24Issue:

Afzali N.Keshavarzi R.^aTangestaninejad S.^a Gimenez S.Mirkhani V.^aMoghadam M.^aMohammadpoor Baltork I.^a

a :University of Isfahan - IRAN(IR) - Isfahan

Hybrid Gold • GreenDOI:10.1016/j.apmt.2021.101159Language: English

Abstract

Metal-Organic Frameworks (MOFs) are a group of compounds with high porosity and diverse capabilities in photoelectrochemistry. The use of these compounds as photocatalysts and photoelectrodes is still a strong challenge due to bulk and surface recombination issues. To solve this problem, we applied a dual strategy to simultaneously enhance charge separation and catalytic activity in MIL-125-NH2 and UIO-66-NH2 MOF photocatalysts. Mesoporous TiO2 was used as electron-selective contact on the MOF surface (MOF/TiO2) to minimize bulk recombination. On the other hand, to increase the MOF catalytic activity for water oxidation, a well-matched Co3(PO4)2 (CoPi) co-catalyst (CoPi/MOF/TiO2) was used. The obtained results showed that CoPi and TiO2 were introduced in the MOF structure. The (CoPi/MOF/TiO2) photoelectrodes showed a photocurrent density 26 times higher compared to the reference MOF at 1.23 V vs. RHE for PEC water oxidation of artificial seawater, validating the developed strategy for further photocatalytic and photoelectrochemical applications. © 2021