NiCo2O4 nanostructures loaded onto pencil graphite rod: An advanced composite material for oxygen evolution reaction
نویسندگان
چکیده
Driving oxygen evolution reaction (OER) at extremely low overpotential and the blockage of gas inside catalytic material leads to deactivation activity, therefore it is an essential step in electrochemical energy conversion systems, but still very challenging task. The clay minerals including bentonite kaolinite are rich with plenty active centers favorable chemical composition for catalysis applications limited by insulating properties, thus they cannot be used as electrode water splitting. unique presence form pencil graphite rod (PGR) its attractive architecture enabled us exploit advantageous features use them situ growth metal oxide nanostructures electrolysis applications. naturally inherent SiO2 favors properties durability whereas MgO produces abundant vacancies Co3+ ions OER process. Herein, we present a facile approach using PGR host substrate co-catalyst loading Co3O4, NiCo2O4 NiO modified carried high porosity easily bubbling gas, intrinsic coming from both oxides excellent fabricated physically well-characterized, has natural ability sustain long term stability even higher current densities industrial electrolyzer conditions. NiCo2O4/PGR, Co3O4/PGR, NiO/PGR electrodes exhibit 234, 242 272 mV respectively density 100 mAcm−2 1.0 M KOH electrolytic solution. large number through MgO, Ni2+/Ni3+ Co3+/Co2+ ratios, multi centers, specific surface area, pore volume, area fast charge transport within NiCo2O4/PGR main reasons superfast kinetics. Thus, proposed method design will pave potential way performance devices like air batteries, fuel cell supercapacitors.
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ژورنال
عنوان ژورنال: International Journal of Hydrogen Energy
سال: 2022
ISSN: ['0360-3199', '1879-3487']
DOI: https://doi.org/10.1016/j.ijhydene.2021.12.024