Tailoring the transport and magnetic properties of Mn doped spinel FeCo2O4 and their impact on energy storage properties: A new strategy to improve storage performance

Sintese de cobaltita de ferro para uso na decomposição de contaminante orgânico em sistema foto-Fenton solar

“…O resultado de DRX se encontra em concordância com os dados de FTIR, que confirmaram a formação do cristal FeCo 2 O 4 com estrutura espinélica. A Figura 3 mostra as partículas da FeCo 2 O 4 atraídas por um imã, devido às suas propriedades magnéticas, as quais podem ser facilmente separadas e recuperadas da solução por um campo magnético para posterior reutilização (SINGH et al, 2021;XIE et al, 2021).…”

“…Este sistema recebe grande atenção por seu alto rendimento de radical hidroxila gerado pela combinação de peróxidos (principalmente o peróxido de hidrogênio), íons ferrosos e irradiação em meio ácido (ZHOU et al, 2014;MAEZONO et al, 2011;OLIVEIRA et al, 2019). Possui etapas e reagentes de natureza segura e ambientalmente amigável, princípios de funcionamento relativamente simples e tempo curto de reação, sendo o mais usado em aplicações ambientais (VELÁSQUEZ et al, 2014;OLIVEIRA et al, 2019;OLIVEIRA et al, 2016).…”

Investigation of Zn-Substituted FeCo2O4 for the Oxygen Evolution Reaction and Reaction Mechanism Monitoring through In Situ Near-Ambient-Pressure X-ray Photoelectron Spectroscopy

“…Replacing Zn 2+ ions with a cobalt-based spinel structure changes the electronic structure of and greatly alters the properties of FeCo 2 O 4 . − Due to its stable divalent state and low electronegativity, the Zn 2+ ion is considered a promising candidate for doping; it mainly occupies the “A” site or tetrahedral site in a spinel structure, increasing the number of cation vacancies . Some reports have revealed that the use of cation substitution in spinel materials has been discovered to lead to more electron transitions during the electrochemical reaction and higher electrochemical performance. − …”

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo2O4@SiO2 Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

“…CuO has the strongest oxygen release capacity, but CuO is prone to sintering at high temperatures, agglomeration after reduction, and thus has poor recycling performance . In recent years, spinel (AB 2 X 4 ) oxides have been continuously applied in several research fields, such as energy storage and environmental treatment, due to their magnetic property, high catalytic activity, and good chemical stability. − A series of spinel oxides have also been widely used as oxygen carriers in CLC processes due to the synergistic effect of their complex metal oxides. − Among the spinel-type oxides, cobalt-based spinel oxides have good activity, low cost, high stability, and environmental benefits. − CuCo 2 O 4 , constructed by replacing Co 2+ in the tetrahedral position in Co 3 O 4 with Cu 2+ , is a typical spinel structure. , At 900 °C, the mercury removal efficiency of CuCo 2 O 4 is 16% higher than that of Co 3 O 4 , and it reaches the maximum mercury removal efficiency faster (as shown in Figure S1). CuCo 2 O 4 has better oxygen release properties than Co 3 O 4 and can further improve the oxidation of mercury in the fuel reactor.…”