Efficient oxygen evolution catalysts with synergistic reactivity: CoFe2O4/C derived from bimetallic organic framework supported on nitrogen-doped carbon nanoarray structure

Preparation of CoFe2O4-Doped TiO2 Nanofibers by Electrospinning and Annealing for Oxygen Electrocatalysis

“…This can be attributed to the fact that ORR is a reaction in which oxygen obtains electrons from the catalyst surface. In CoFe 2 O 4 NFs with a bimetallic spinel structure, the electron exchange between O, Co, and Fe atoms in octahedral sites is easier, which accelerates the breaking of O–O bonds and ultimately accelerates the reaction speed of ORR . At the same time, the bimetallic synergism makes it easier for oxygen to acquire electrons and speed up the mass transfer process.…”

Sodium Tartrate-Assisted Synthesis of High-Purity NiFe2O4 Nano-Microrods Supported by Porous Ketjenblack Carbon for Efficient Alkaline Oxygen Evolution

“…More profoundly, the introduction of cheap and commercially available KB during the synthesis of NiFe 2 O 4 /KB and CoFe 2 O 4 /KB produced catalysts with much higher OER activities compared with the corresponding ferrite counterparts (NiFe 2 O 4 and CoFe 2 O 4 ). The η 10 value of 258 mV (vs RHE) measured for NiFe 2 O 4 /KB is one of the smallest values yet reported for ferrite-based electrocatalysts during OER (Table S1), − ,,,,,,− outperforming NiFe 2 O 4 /carbon cloth (340 mV vs RHE), NiFe 2 O 4 /FeNi 3 foam (262 mV vs RHE), NiFe 2 O 4 /Ti 3 C 2 (266 mV vs RHE), NiFe 2 O 4 /Ni@C (330 mV vs RHE), NiFe 2 O 4 -hollow nanoparticles/CNTs (260 mV vs RHE), and NiFe 2 O 4 /rGO (302 mV vs RHE) . Few ferrite-based composite catalysts have been reported with η 10 values lower than NiFe 2 O 4 /KB, though most have complicated compositions and cumbersome preparation routes, such as phosphided NiFe/NiFe 2 O 4 embedded into porous N-doped carbon nanospheres (P-FeNi/FeNiO/CNS, 220 mV vs RHE) or 3D porous CoFe 2 O 4 /C nanorod arrays supported on Ni foam@polyaniline (Ni foam@NC-CoFe 2 O 4 /C, 240 mV vs RHE) …”

“…34 Nozari-Asbemarz et al grew cobalt containing metal−organic frameworks (MOFs) on nickel foam via a solvothermal method employing organic nicotinic acid as a linker, which upon heating at 500 °C yielded Co 3 O 4 and CoFe 2 O 4 nanoparticles on Ni foam and good OER activity. 35 A number of groups have prepared 39 2,5-dioxido-1,4-benzenedicarboxylic acid, 33,40 nicotinic acid, 35 and p-benzenedicarboxylic acid. 41 However, the syntheses of many of these MOFs require toxic organic solvents such as N,N-dimethylformamide and dimethylformamide, making the syntheses environmentally unfriendly.…”

“…Recently, MOFs have emerged as very promising precursors for the preparation of NiFe 2 O 4 or CoFe 2 O 4 -based composite catalysts due to their compositional control (e.g., specific Ni:Fe and Co:Fe molar ratios of 1:2). Typical organic linkers used to construct NiFe-MOFs or CoFe-MOFs as precursors of NiFe 2 O 4 or CoFe 2 O 4 , respectively, include 1,4-benzenedicarboxylic acid, 2,5-dioxido-1,4-benzenedicarboxylic acid, , nicotinic acid, and p -benzenedicarboxylic acid . However, the syntheses of many of these MOFs require toxic organic solvents such as N , N -dimethylformamide and dimethylformamide, making the syntheses environmentally unfriendly.…”

Research progress of spinel CoFe2O4 as an electrocatalyst for the oxygen evolution reaction

“…Gao and his team prepared CoFe 2 O 4 /C supported by carbon nitride nanoarray materials (denoted as NC-CoFe 2 O 4 /C@CP) with [M 2 (dobdc)] (MOF-74-M, H 2 dodc = 2,5-dioxido-1,4-benzenedicar-boxylic acid) as a precursor. 59 Polyaniline nanowire arrays were coated on carbon paper by electrochemical polymerization, and MOF-74-Co/Fe was directly grown on its surface. Lastly, the OER catalyst was formed by pyrolysis.…”