Adjusting the catalytic properties of cobalt ferrite nanoparticles by pulsed laser fragmentation in water with defined energy dose.

ABSTRACT: Highly active, structurally disordered CoFe₂O₄/CoO electrocatalysts are synthesized by pulsed laser fragmentation in liquid (PLFL) of a commercial CoFe₂O₄ powder dispersed in water. A partial transformation of the CoFe₂O₄ educt to CoO is observed and proposed to be a thermal decomposition process induced by the picosecond pulsed laser irradiation. The overpotential in the OER in aqueous alkaline media at 10 mA cm^-2 is reduced by 23% compared to the educt down to 0.32 V with a Tafel slope of 71 mV dec^-1. Importantly, the catalytic activity is systematically adjustable by the number of PLFL treatment cycles. The occurrence of thermal melting and decomposition during one PLFL cycle is verified by modelling

SUBMITTER: Waag F 

PROVIDER: S-EPMC5640596 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature