Hierarchical NiCo2O4 hollow nanospheres as high efficient bi-functional catalysts for oxygen reduction and evolution reactions

Self‐Assembly of Three‐Dimensional Zinc‐Doped NiCo2O4 as Efficient Electrocatalysts for Oxygen Evolution Reaction

“…reported self‐assembled hierarchical NiCo 2 O 4 hollow micro‐cuboids as bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and OER reactions . Hierarchical NiCo 2 O 4 hollow nanospheres have also been synthesized, which exhibited enhanced catalytic activities to both the oxygen reduction reaction (ORR) and OER . Recent studies have shown another new strategy to further enhance the electrochemical properties of NiCo 2 O 4 , by doping with foreign metal ions, such as Fe, Zn, and Mn etc .…”

“…[9] Hierarchical NiCo 2 O 4 hollow nanospheres have also been synthesized,w hich exhibited enhanced catalytic activities to both the oxygen reduction reaction (ORR) and OER. [10] Recent studies have showna nother new strategy to furtherenhancethe electrochemical properties of NiCo 2 O 4 ,b yd oping with foreignm etal ions, such as Fe, Zn, and Mn etc. [11] Considering the complementarities and synergic effects of multiple transition metals, these NiCo 2 O 4 -based mixedt ransition-metal oxides have been widely investigated as promising alternative anode materials for lithium ion batteries (LIBs) [12] and appealings upercapacitor electrodes.…”

NiCo2O4 nanosheets grown on current collectors as binder-free electrodes for hydrogen production via urea electrolysis

“…Nickel cobaltite (NiCo 2 O 4 ) is a promising electrode material for supercapacitors, batteries, and electrocatalysis due to its low cost, good redox behavior, high conductivity, abundant resources, and environmental benignity. [19][20][21][22][23][24][25][26] Nanostructured NiCo 2 O 4 on conductive substrates has exhibited improved specific capacitance and cycling performance. [20,27] Therefore, it is interesting to extend the applications of nanostructured NiCo 2 O 4 to urea electrolysis for hydrogen production.…”

Electrochemical impacts of sheet-like hafnium phosphide and hafnium disulfide catalysts bonded with reduced graphene oxide sheets for bifunctional oxygen reactions in alkaline electrolytes

“…Both the HfP-rGO NS and HfS 2 -rGO NS showed superior catalytic activities compared with most catalysts for ORR and OER. For OER, at the current density of 5 mA cm À2 , HfP-rGO NS achieved the potential at 1.82 V vs. RHE, which is lower than that of other catalysts such as IrO 2 (1.85 V), 9 RuO 2 (1.85 V), 10 Pt/C (1.92 V) and HfS 2 -rGO NS (1.92 V). As discussed earlier, the proton-acceptor property of phosphide-based HfP-rGO NS has an outstanding catalytic activity for O 2 evolution.…”

“…[6][7][8] However, the slow and sluggish kinetics of these oxygen reactions at the air cathode result in high overpotential and poor oxygen adsorption, which severely limit the overall efficiency of the working cells. [9][10][11][12][13][14][15][16] Therefore, designing bifunctional electrocatalysts for both OER and ORR is highly desirable for reversible fuel cell and metal-oxygen battery systems.…”