Enhanced Water Oxidation Activity by Introducing Gallium into Cobalt‐Iron Oxide System

2019 ◽  
Vol 7 (1) ◽  
pp. 118-123
Author(s):  
Qiaoqiao Zhang ◽  
Yong Fan ◽  
Wei Wang ◽  
Ning Liu ◽  
Jingqi Guan
Keyword(s):  
Iron Oxide ◽  
Water Oxidation ◽  
Oxide System ◽  
Oxidation Activity ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron

scholarly journals An ultrathin cobalt–iron oxide catalyst for water oxidation on nanostructured hematite photoanodes

2019 ◽  
Vol 7 (11) ◽  
pp. 6012-6020 ◽  
Author(s):  
Laurent Liardet ◽  
Jordan E. Katz ◽  
Jingshan Luo ◽  
Michael Grätzel ◽  
Xile Hu
Keyword(s):  
Iron Oxide ◽  
Water Oxidation ◽  
Oxide Catalyst ◽  
Photoelectrochemical Performance ◽  
Iron Oxide Catalyst ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron ◽  
Optically Transparent

An optically transparent cobalt-iron oxide catalyst improves the photoelectrochemical performance of nanostructured hematite photoanodes.

Preparation and physical characterization of cobalt iron oxide magnetic nanoparticles loaded polyvinyl alcohol

2021 ◽  
pp. 089270572098557
Author(s):  
M Abu-Abdeen ◽  
O Saber ◽  
E Mousa
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Saturation Magnetization ◽  
Polymer Films ◽  
Magnetic Hysteresis ◽  
Thermal Method ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron ◽  
Iron Oxide Magnetic Nanoparticles

A solvent thermal method which depends on a thermal process under critical temperature and pressure was used to prepare cobalt iron oxide magnetic nanoparticles with a molar ratio 2. The prepared particles were in the form of nanoparticles with diameter ranging from 5 to 10 nm and with amorphous structure. Magnetic hysteresis behavior with saturation magnetization 36.31 emu/g and coercivity 4 Oe were observed for the nanoparticles. Polyvinyl alcohol was loaded with different concentrations of cobalt iron oxide nanoparticles using casting technique. Hysteresis loops for the polymer films were observed and both the saturation magnetization and coercivity were increased from 0.36 to 16.03 emu/g and 115 to 293 Oe for samples containing 5 and 20 wt% of nanoparticles, respectively. The elastic modulus of films was increased from 2.7 to 4.9 GPa for unloaded and loaded samples with 20 wt%, respectively. The storage modulus of the polymer films was found to obey the percolation behavior.

Synthesis of Cobalt Iron Oxide Doped by Chromium Using Sol-Gel Method and Application to Remove Malachite Green Dye

2021 ◽  
Vol 19 (8) ◽  
pp. 32-41
Author(s):  
Ebtisam K. Alwan ◽  
Aqeel Mohhamed Hammoudi ◽  
Intessar K. Abd ◽  
Maryam O. Abd Alaa ◽  
Mohammed Nsaif Abbas
Keyword(s):  
Iron Oxide ◽  
Surface Area ◽  
Malachite Green ◽  
Contact Time ◽  
Sol Gel ◽  
Gel Method ◽  
Malachite Green Dye ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron ◽  
Acidic Function

In the current paper, the nanoparticles of cobalt iron oxide doped by chromium (CIC) of (CrxCoFe2-xO4) formula were prepared by sol-gel method using the nitrate salts of the elements composed of this nanomaterial. The characteristic properties of CIC nanoparticles prepared were determined using X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) in addition to scanning electron microscopy (SEM) and also examination of the surface area (BET). These tests showed that the CIC nanoparticle prepared was in a pure phase, in addition to having various functional groups; moreover their structural framework includes multiple pores, which was the reason for the high surface area, reached to 223.36 m2.g-1. The prepared CIC nanoparticle was applied as an adsorbent to recover the malachite green dye from aqueous contaminated solutions in a batch mode adsorption unit and under different operating conditions. Designing factors used to determine the efficiency of the CIC as an adsorption media for the organic dye included the acidic function (pH), contact time and amount of nanomaterial CIC. The obtained practical results showed that the removal efficiency of the malachite green dye using CIC nanoparticle was 88.519% at 50 ppm of the initial concentration of the contaminated solution and that the percentage removal was directly proportional to the amount of adsorbent, contact time and acidic function.

Thermo-Chemical Expansion in Strontium-Doped Lanthanum Cobalt Iron Oxide

2010 ◽  
Vol 93 (12) ◽  
pp. 4115-4121 ◽  
Author(s):  
Sean R. Bishop ◽  
Keith L. Duncan ◽  
Eric D. Wachsman
Keyword(s):  
Iron Oxide ◽  
Chemical Expansion ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron

Surface and Bulk Defect Equilibria in Strontium-Doped Lanthanum Cobalt Iron Oxide

2009 ◽  
Vol 156 (10) ◽  
pp. B1242 ◽  
Author(s):  
S. R. Bishop ◽  
K. L. Duncan ◽  
E. D. Wachsman
Keyword(s):  
Iron Oxide ◽  
Defect Equilibria ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron
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