Phase Transition Kinetics via Operando Monitoring Electro-Oxidation Reaction of 5-Hydroxymethylfurfural on Amorphous Nickel Oxyhydroxide

High Resolution Image Download MS PowerPoint Slide Nickel-based electrocatalysts have been studied for the electrochemical 5-hydroxymethylfurfural oxidation reaction (HMFOR) to produce 2,5-furan-dicarboxylic acid. Their catalytic activity is suggested to be related to structural changes and hydrogen atom transfer pathways. Here, we developed an efficient electrocatalyst by introducing amorphous NiOOH through electro-driven dual-ion leaching from phosphorized nickel–molybdenum oxide nanoarrays. Operando X-ray absorption spectroscopy and Raman spectroscopy reveal that the amorphous NiOOH catalyst undergoes a rapid phase transformation to form Ni(OH) 2 states during the HMFOR, whereas a conventional NiOOH catalyst transitions to Ni(OH) 2 via a mixed phase of NiOOH/Ni(OH) 2 . Operando infrared spectroscopy analysis under chronopotentiometry additionally provides insights into the electro-kin…