AC conductivity, electrochemical and magnetic studies of CoWO4/PbWO4 nanocomposites

Jeyakanthan, M.; Subramanian, Uma; Tangsali, R.B.; Ramesh, A.

doi:10.1016/j.physb.2020.412151

Cited by 16 publications

(6 citation statements)

References 53 publications

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“…Furthermore, the presence of W 5+/6+ and Co 2+/3+ states in CoWO 4 @C was unambiguously confirmed from the XPS analysis, which is discussed later. For CoWO 4 prepared again by a co-precipitation method, the dc conductivity was estimated to be 1.42 × 10 –5 S cm –1 . The electrical conductivities were estimated from their Nyquist plots (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…For CoWO 4 prepared again by a co-precipitation method, the dc conductivity was estimated to be 1.42 × 10 −5 S cm −1 . 31 The electrical conductivities were estimated from their Nyquist plots (Figure 1d). Variation of conductivity for both semiconductors with frequency is provided in Figure 1e, and it declines with decreasing frequency 32 possibly due to the induced slower charge-carrier oscillations.…”

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confidence: 99%

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Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Deshagani

Naskar

Padval

et al. 2022

ACS Appl. Energy Mater.

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Semiconducting cobalt tungstate flanked by carbon (CoWO4@C) polyhedral microstructures with smooth facets and zinc ferrite (ZnFe2O4) polydisperse interconnected nanoparticles via intrinsic mechanisms of hole polaron transfer from Co3+ to Co2+ sites and electron hopping between Fe2+ and Fe3+ states, respectively, were endowed with high room-temperature electrical conductivities (>0.9 mS cm–1), thus enabling the fabrication of a high-performance asymmetric supercapacitor (ASC) possessing an outstanding rate capability as well as a good trade-off between power (P) and energy (E) densities. Furthermore, electrochemical response comparison of CoWO4@C//ZnFe2O4 ASCs encompassing three different electrolytes (aqueous KOH, KOH–PEO gel, and KOH–PVA gel) revealed that the KOH–PEO gel cell outperformed the other two ASCs, with a specific capacity (SC) of 339 F g–1 (at 1 A g–1) and E max and P max of 105 Wh kg–1 and 3.2 kW kg–1 achieved over an operational voltage window of 1.5 V while retaining 97% of the original SC after 10,000 cycles. With KOH and KOH–PVA gel, while the P max remained the same, SCs of 300 and 322 F g–1 and E max’s of 93 and 100 Wh kg–1 were obtained. The high ionic conductivity (81.6 mS cm–1) of the KOH-PEO gel is attributed to the hydrogen bonded networked structure of the gel with free spaces that allows ions to move freely within the polymer matrix. Further, the oxygens along the polymer chains ensure a high dissociation of KOH. The gel also serves as an ion-reservoir and these factors cumulatively resulted in the enhanced performance of the ASC. This study showcases that scalable, low-cost, leak-proof supercapacitors can be fabricated using environmentally friendly electroactive materials that can be synthesized easily using simple wet chemistry techniques.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Deshagani

Naskar

Padval

et al. 2022

ACS Appl. Energy Mater.

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“…According to the paramagnetic phenomenon, the observed isothermal magnetization increases roughly linearly with rising magnetic fields in the high-temperature domain (T = 300 K). [49] When the magnetic field rises in T = 5 K, the M(H) curve slope also progresses. The rise in values might be attributable to the magnetic moments remaining effectively arranged along the field trajectory.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Investigation of Morphology, Optical and Electronic Ac Conduction of the Olivine Manganite Compound: NaMnPO₄

Miladi,

Gzaiel,

Azaza

et al. 2024

Eur J Inorg Chem

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The development of multifunctional materials is an exceptional research area, which is aimed at enhancing the versatility of materials according to their wide fields of application. Special interest was devoted here to the orthophosphate compound, in particular, the olivine NaMnPO4 material. This compound was successfully synthesized by a solid‐state method and characterized using various techniques. Preliminary room‐temperature structural analysis evidences the sample formation in the orthorhombic structure and its phase purity. The material’s morphology, analyzed by scanning electron microscopy (SEM), is identified by a spherical grain size distribution. The average grain size of the sample was estimated to be around 420 nm. Moreover, the optical investigation of UV‐visible spectroscopy has revealed that the band gap for our sample is (Eg = 2.28 eV), which shows that our compound is a potential candidate for optoelectronic applications. The electrical behavior study's main results confirm the ferroelectric character of the sample and support the aim of deepening the knowledge of the material according to its thermally stimulated conduction processes through impedance spectroscopy. Electrical studies revealed the dominant transport processes across various temperature and frequency ranges, leading to the NSPT model. The frequency dependency relates to frequency‐dispersive dielectric spectra, conduction mechanisms, and relaxation phenomena.

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“…In relation to the electronic properties of CoWO 4 crystals, different studies have demonstrated that this tungstate is a good candidate for technological applications in high-density capacitors [51][52][53][54][55], solid-electrolyte galvanic cells [56], catalysts for hydrogen evolution reaction [57], magnetic [58][59][60], electric transport [61], microwave dielectric [62], photoluminescence [63], photocatalyst [64,65], electrocatalytic [66], tribological [67], desulfurization [68], sensitive nonenzymatic glucose sensor [69], acetone gas sensing [70], high capacity anode material for lithium-ion batteries [71], and color properties [72].…”

Section: Introductionmentioning

confidence: 99%

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

Oliveira

Gouveia

Costa

et al. 2022

Materials Science for Energy Technologies

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AC conductivity, electrochemical and magnetic studies of CoWO4/PbWO4 nanocomposites

Cited by 16 publications

References 53 publications

Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Investigation of Morphology, Optical and Electronic Ac Conduction of the Olivine Manganite Compound: NaMnPO₄

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

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AC conductivity, electrochemical and magnetic studies of CoWO4/PbWO4 nanocomposites

Cited by 16 publications

References 53 publications

Electrical Conduction in CoWO4 Flanked by Carbon and ZnFe2O4 Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Electrical Conduction in CoWO4 Flanked by Carbon and ZnFe2O4 Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Investigation of Morphology, Optical and Electronic Ac Conduction of the Olivine Manganite Compound: NaMnPO4

Investigation of electronic structure, morphological features, optical, colorimetric, and supercapacitor electrode properties of CoWO4 crystals

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Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Electrical Conduction in CoWO₄ Flanked by Carbon and ZnFe₂O₄ Nanoparticulate Assembly and a Poly(ethylene oxide) Gel for Enhanced Electrochemical Activity

Investigation of Morphology, Optical and Electronic Ac Conduction of the Olivine Manganite Compound: NaMnPO₄