Ethanol-assisted synthesis and adsorption property of flake-like NiFe2O4 nanoparticles

Strongly Coupled FeNi Alloys/NiFe2O4@Carbonitride Layers-Assembled Microboxes for Enhanced Oxygen Evolution Reaction

“…48,49 The absence of peak at ∼1160 cm −1 for Fe 2 O 3 and double peaks for Fe 3 O 4 confirm their absence in the asprepared composites. 50,51 The peaks at ∼1340 and 1591 cm −1 indicate the presence of D and G band in carbonitride layers, which is also confirmed by TGA with two exothermic peaks indicating the two-step oxidation process (Figure 3A). In the temperature range of 40−450 °C, the weight loss of ∼0.5 wt % is observed due to the desorption of physically absorbed water oxides in the as-prepared composites.…”

“…The pyridinic N species could coordinate with Fe ions to form Fe–N–C species, implying the possible interaction between NC and metal species . Raman spectra in Figure D differentiate the NiFe 2 O 4 from other possible phases, such as Fe 2 O 3 and Fe 3 O 4 , where the two strong bands around 488 and 690 cm –1 are assigned to the F 2g (2) of the tetrahedral (Fe 3+ at A) and the A 1g of octahedral (Ni 2+ , Fe 3+ at B) sites due to the FeO 4 disordered tetrahedron in the NiFe 2 O 4 oxide, respectively. , The absence of peak at ∼1160 cm –1 for Fe 2 O 3 and double peaks for Fe 3 O 4 confirm their absence in the as-prepared composites. , The peaks at ∼1340 and 1591 cm –1 indicate the presence of D and G band in carbonitride layers, which is also confirmed by TGA with two exothermic peaks indicating the two-step oxidation process (Figure A). In the temperature range of 40–450 °C, the weight loss of ∼0.5 wt % is observed due to the desorption of physically absorbed water as well as the combustion loss of carbonitride layers, and the weight gain of ∼18.4 wt % is attributed to the oxidation of FeNi alloys during 450–860 °C, suggesting that the highest alloying degree on the FeNi/NiFe 2 O 4 /NC-800, which is not directly relevant with the amount of carbon in FeNi/NiFe 2 O 4 /NC.…”

3D Nest-Like Architecture of Core–Shell CoFe2O4@1T/2H-MoS2 Composites with Tunable Microwave Absorption Performance

“…Therefore, to confirm it, ZFC/FC curves of CoFe 2 O 4 at 100 and 500 Oe are presented in Figure 6b,c. Owing to the irregular size distribution of CoFe 2 O 4 nanoparticles, the obvious furcation of ZFC and FC curves at a certain temperature T joint cannot be found when the temper-ature is up to 400 K at 100 Oe, which means that the blocking temperature T B will be higher than 400 K. 46,47 However, at 500 Oe, a broad maximum T max observed from the ZFC curve occurs at about 278 K, which indicates that most of the CoFe 2 O 4 nanoparticles in this case are being blocked at T max . 48 Also, in Figure 6c, the difference between T max and T joint is caused by the strong magnetic couplings between nanoparticles.…”

Designing different morphologies of NiFe2O4 for tuning of structural, optical and magnetic properties for catalytic advancements

“…Reports have been available in the literature regarding the synthesis of spinel ferrites with distinctive morphologies and their characterization. [25][26][27][28] Still there is room to contribute. Until now, interestingly, no reports have been made available elaborating and relating the comparative effect of different synthetic methodologies on the structural properties, morphological and magnetic characteristics and on the catalytic performance of ferrites for cleaning the environment.…”