Magnetic CuFe2O4 Nanoparticles with Pseudocapacitive Properties for Electrical Energy Storage

Abstract

This investigation is motivated by increasing interest in the development of magnetically ordered pseudocapacitors (MOPC), which exhibit interesting magnetocapacitive effects. Here, advanced pseudocapacitive properties of magnetic CuFe2O4 nanoparticles in negative potential range are reported, suggesting that CuFe2O4 is a promising MOPC and advanced negative electrode material for supercapacitors. A high capacitance of 2.76 F cm−2 is achieved at a low electrode resistance in a relatively large potential window of 0.8 V. The cyclic voltammograms and galvanostatic charge–discharge data show nearly ideal pseudocapacitive behavior. Good electrochemical performance is achieved at a high active mass loading due to the use of chelating molecules of ammonium salt of purpuric acid (ASPA) as a co-dispersant for CuFe2O4 nanoparticles and conductive multiwalled carbon nanotube (MCNT) additives. The adsorption of ASPA on different materials is linked to structural features of ASPA, which allows for different interaction and adsorption mechanisms. The combination of advanced magnetic and pseudocapacitive properties in a negative potential range in a single MOPC material provides a platform for various effects related to the influence of pseudocapacitive/magnetic properties on magnetic/pseudocapacitive behavior.

Synergistic Interface Platforms: Designing Superhydrophilic Conductive Nanoparticle‐Decorated Nanofibrous Membranes

“…[ 39 ] The symmetric shape of the cyclic voltammogram indicates that the material possesses good electrochemical properties and can efficiently store and release electrical energy. [ 40 ] The minimal decline and good overlap observed in both groups over the 100‐cycle period can indicate minimal capacity loss. [ 41 ] This suggests that the composite membrane exhibits good cyclic stability.…”

“…In CV, a symmetric voltammogram with an auroral oval shape between the anodic and cathodic regimes is characteristic of a capacitive behavior of non-Faradaic pseudocapacitive nature. [39,40] This shape suggests that the material undergoes fast redox reactions over the electrode's exposed area to the electrolyte. [39] The symmetric shape of the cyclic voltammogram indicates that the material possesses good electrochemical properties and can efficiently store and release electrical energy.…”

Influence of Capping Agents on the Synthesis of Mn3O4 Nanostructures for Supercapacitors

“…75−77 Moreover, magnetic properties can be combined with pseudocapacitive properties in solid solutions for the fabrication of magnetically controlled capacitive devices. 78,79 The strategy of this investigation can be applied for accelerating the activation of other promising materials 80 for supercapacitor applications. The Mn 3 O 4 -based positive electrodes prepared in this investigation were combined with FeOOH-based negative electrodes 81 for the preparation of an asymmetric device for operation in a Na 2 SO 4 electrolyte in a window of 1.6 V (Figure S5).…”

“…It should be noted that Mn 3 O 4 belongs to the spinel family of materials. The rich material chemistry of spinels allows the fabrication of advanced solid solutions with enhanced properties, such as enhanced capacitance and electrical conductivity. − Moreover, magnetic properties can be combined with pseudocapacitive properties in solid solutions for the fabrication of magnetically controlled capacitive devices. , The strategy of this investigation can be applied for accelerating the activation of other promising materials for supercapacitor applications.…”

Copper ferrite obtaining from microelectronics waste

“…Данные наноча-стицы могут быть извлечены методом магнитной сепарации и повторно использованы в течение шести последовательных циклов без заметной потери каталитической способности [26]. Также феррит меди может использоваться и в других современных приложениях [27,28]. После тщательной переработки порошок оксида железа (III) Fe 2 O 3 находит применение в электротехнике в составе высоковольтных резисторов для заземления нейтрали сетей, ионно-литиевых аккумуляторов, в качестве носителя аналоговой и цифровой информации; в радиотехнической отрасли -в составе низковольтных резисторов, высокочастотных дросселей, малогабаритных импульсных трансформаторов; в химической промышленности -в составе катализатора при производстве аммиака, а также катализатора дегидрирования при синтезе диеновых мономеров, катализированное карамельное топливо; в нефтехимической промышленности -в качестве минеральных красок, белил, эмалей и грунтов; используется в качестве компонента керамики и цветных цементов, как пигмент-краситель дорожного покрытия, цемента и тротуарной плитки, термитной сварки стальных конструкций, полирующего средство для стали и стекла.…”