Performance Promotion of Multipurpose Catalysts Using Increased Oxygen Vacancy Amounts by Charge-Mismatched Doping

Abstract

Modulatingthe oxygen vacancy (V (0))in nanostructures has opened a new avenue for efficient catalyst design,facilitating biomass oxidation reactions and electrocatalytic properties.In this study, we have investigated the properties of NiO-based catalystswith varying degrees of V (0) achieved throughion doping of the catalyst with cations of different oxidation states(TM3+) or the same valence state (TM2+) as Ni2+ in the NiO matrix. By introducing charge-mismatched dopants,we enhanced the concentration of V (0) inthe NiO catalyst, resulting in remarkable selectivity (& SIM;50%)for the conversion of 2,5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylicacid (FDCA), as well as a lower overpotential in the oxygen evolutionreaction (OER). We believe that charge-mismatched doping offers anovel avenue for optimizing defect engineering in oxide-based catalysts,which can enable more efficient biomass conversion and water splitting.These findings have made a significant contribution to the field ofmultipurpose catalysis and hold the potential to inspire new catalystdesigns that would usher in a more sustainable future. The charge-mismatched ion (Cr3+ or Co3+)-doped NiO nanoparticles with abundant oxygen vacancies exhibitedan outstanding conversion rate of 50% from HMF to FDCA with a highconversion yield of nearly 95% during the photocatalytic degradationreaction.