2 D amorphous frameworks of NiMoO4 for supercapacitors: defining the role of surface and bulk controlled diffusion processes

Ajay, Amrutha; Paravannoor, Anjali; Joseph, Jickson; Amruthalakshmi,; Ss, Anoop; Nair, Shantikumar V.; Balakrishnan, Avinash

doi:10.1016/j.apsusc.2014.11.016

Cited by 55 publications

(23 citation statements)

References 39 publications

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“…Long et al provided a useful and outstanding way to obtain amorphous structure Ni–Co binary oxide that revealed a remarkable specific capacitance (1607 F g −1 at 5 mV s −1 , Figure f) and great electrochemical stability (at 91% of the starting value after 2000 cycles) through chemical bath deposition and simple calcination (Figure c). Moreover, Ajay et al provided a new microwave‐assisted synthesis technique to prepare amorphous NiMoO 4 . The as‐prepared materials as electrodes delivered a satisfactory specific capacitance (1650 F g −1 at 1.25 A g −1 ), energy density (92 W h kg −1 ), and power density (23 kW kg −1 ) as well as a perfect cycling stability.…”

Section: Amorphous Tmosmentioning

confidence: 99%

Recent Progress in Some Amorphous Materials for Supercapacitors

Zheng

et al. 2018

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A breakthrough in technologies having "green" and sustainable energy storage conversion is urgent, and supercapacitors play a crucial role in this area of research. Owing to their unique porous structure, amorphous materials are considered one of the best active materials for high-performance supercapacitors due to their high specific capacity, excellent cycling stability, and fast charging rate. This Review summarizes the synthesis of amorphous materials (transition metal oxides, carbon-based materials, transition metal sulfides, phosphates, hydroxides, and their complexes) to highlight their electrochemical performance in supercapacitors.

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Section: Amorphous Tmosmentioning

confidence: 99%

Recent Progress in Some Amorphous Materials for Supercapacitors

Zheng

et al. 2018

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“…The magnetic oxides have many crystals whose shapes depend upon, the synthesizing technique, and temperature of the annealing process. Besides, their specific capacitance and better cycling stability are dependent on the crystals' shape (Ajay et al 2015). Also, the replacement of multiple cations into the A-or B-sites can change the symmetry of the pristine structure and consequently, the physical and chemical properties (Zhang et al 2016c).…”

Section: Resultsmentioning

confidence: 99%

“…The specific capacitance and better cycling stability of nickel molybdate are dependent on the crystals' shapes. Ajay et al (2015) observed that the two-dimensional nickel molybdate like-nanoflakes synthesized via rapid microwave-assisted achieved 1739 F g −1 of specific capacitance at 1 mV s −1 of scan rates. While, Huang et al (2015a) found that three-dimensional form interconnected nickel molybdate like-nanoplate arrays show a specific capacitance as high as 2138 F g −1 at a current density of 2 mA cm −2 , and an outstanding cyclability where lost 13% of its original capacity over 3 × 10 3 cycles.…”

Section: Nickel Molybdate Nimoomentioning

confidence: 99%

Advanced materials and technologies for supercapacitors used in energy conversion and storage: a review

et al. 2020

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Supercapacitors are increasingly used for energy conversion and storage systems in sustainable nanotechnologies. Graphite is a conventional electrode utilized in Li-ion-based batteries, yet its specific capacitance of 372 mA h g −1 is not adequate for supercapacitor applications. Interest in supercapacitors is due to their high-energy capacity, storage for a shorter period and longer lifetime. This review compares the following materials used to fabricate supercapacitors: spinel ferrites, e.g., MFe 2 O 4 , MMoO 4 and MCo 2 O 4 where M denotes a transition metal ion; perovskite oxides; transition metals sulfides; carbon materials; and conducting polymers. The application window of perovskite can be controlled by cations in sublattice sites. Cations increase the specific capacitance because cations possess large orbital valence electrons which grow the oxygen vacancies. Electrodes made of transition metal sulfides, e.g., ZnCo 2 S 4 , display a high specific capacitance of 1269 F g −1 , which is four times higher than those of transition metals oxides, e.g., Zn-Co ferrite, of 296 F g −1. This is explained by the low charge-transfer resistance and the high ion diffusion rate of transition metals sulfides. Composites made of magnetic oxides or transition metal sulfides with conducting polymers or carbon materials have the highest capacitance activity and cyclic stability. This is attributed to oxygen and sulfur active sites which foster electrolyte penetration during cycling, and, in turn, create new active sites.

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“…The redox peaks of C-12 electrode (Figure 8(a-c)) in the given electrolytes can be attributed to the intercalation and de-intercalation of OH -ions from the electrolyte into/through the micro and/or meso fissures in the nano strands. The possible faradaic reactions occurring on the surface of Co(OH) 2 can be shown as: [24] Co(OH) 2 +yOH -+ e -↔ Co(OH) 2-y .yOH -+(1-y) Co(OH) 2 + H 2 O+ e -…”

Section: Influence Of CV Scan Ratesmentioning

confidence: 99%