Se-doped magnetic Co-Ni spinel ferrite nanoparticles as electrochemical catalysts for hydrogen evolution
Mohamed, MJS; Caliskan, S; Gondal, MA; et al.Almessiere, MA; Baykal, A; Slimani, Y; Abdelsabour, EK; Muhammad, H; Auwal Abdullah, I; Khan, AZ; Tahir, A; Roy, A
Date: 28 April 2023
Article
Journal
ACS Applied Nano Materials
Publisher
American Chemical Society
Publisher DOI
Abstract
The magnetic Co0.5Ni0.5Fe2O4 spinel ferrites (NSFs) with various (x%) Se (x = 0.00 - 0.20)
were synthesized via the sol-gel combustion route in conjunction with an advanced green laser
ablation method. The structure and morphology of NSFs were explored through various
physicochemical techniques. Interestingly, Se doping has a crucial ...
The magnetic Co0.5Ni0.5Fe2O4 spinel ferrites (NSFs) with various (x%) Se (x = 0.00 - 0.20)
were synthesized via the sol-gel combustion route in conjunction with an advanced green laser
ablation method. The structure and morphology of NSFs were explored through various
physicochemical techniques. Interestingly, Se doping has a crucial impact on NSFs’ magnetic
properties. While, at room temperature, the pristine sample exhibits a superparamagnetic-like
behavior. While the pristine sample and all doped CoNi NSFs + x% Se (x = 0.05 - 0.20) samples
exhibited a high value of coercivity and remanence at 10 K, indicating their hard magnetic
properties. Our findings indicate that Se can be harnessed to tune the magnetic properties of
CoNiFe2O4 structures. In addition, improving effective electrocatalysts for hydrogen evolution
reaction (HER) efficiency through water-splitting is also vital to overcome the impending
energy crisis due to the rapid depletion of fossil fuels and their injurious impact on the
environment. Hence, the optimized ideal catalysts CoNi NSFs + x% Se (x=0.15) were
developed, which outperformed as electrocatalysts for HER with a Tafel slope of 91 mV/dec
and a very low overpotential of 173.5 mV at a current density of 10 mA/cm2
, which could be
attributed to a large number of electrochemically active surface area (5.2 cm2
), accelerated
electron mobility at the electrocatalysts/electrolyte interface, and long-term stability.
Engineering
Faculty of Environment, Science and Economy
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