Boosting Electrocatalytic Oxygen Evolution over Prussian Blue Analogs/Transition Metal Dichalcogenides Nanoboxes by Photo-Induced Electron Transfer
Solar-assisted electrocatalytic water oxidation holds great promises in modern energy conversion and storage devices. Herein, we present the design and construction of an advanced class of Prussian blue analogs (PBA)/transition metal dichalcogenides (TMDs) hybrids, which combine the intrinsic electrocatalytic activity of TMDs for oxygen evolution reaction (OER) and the sunlight response of TMDs and PBA. Consequently, the porous framework, engineered surface defects, and rich oxygen vacancies endow them with remarkably enhanced electrocatalytic performance toward OER due to the enlarged electrolyte-accessible surface, high structural integrity, and abundant electron and mass transfer routes. Moreover, it could also enable photo-assisted oxidation reactions with significantly high current density and low overpotential. Mechanism investigations reveal that the OER improvement can mainly be ascribed to the combination of photo-driven and electro-driven water oxidation reaction, where the photogenerated electron transfer from PBA to TMDs, raising photogenerated holes in PBA more beneficial for the oxidation of H2O and affording decreased activation energy of TMDs for OER. This work manifests the photo-assisted electrocatalytic water oxidation of PBA/TMDs hybrids and offers a new avenue for the design and construction of high-performance electrocatalysts for water splitting upon light irradiation.