Self-assembled and highly faceted growth of Mo and V doped ZnO nanoflowers for high-performance supercapacitors

Pallavolu, Mohan Reddy; Nallapureddy, Jyothi; Nallapureddy, Ramesh Reddy; Neelima, G.; Kumar, Yedluri Anil; Mandal, Tapas K.; Pejjai, Babu; Joo, Sang Woo

doi:10.1016/j.jallcom.2021.161234

Cited by 58 publications

(16 citation statements)

References 86 publications

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“…The prepared rectangular electrode, Pt foil, and saturated calomel electrode are employed as the working, counter, and reference electrodes. Based on the GCD curve, the gravimetric specific capacity ( C s , C g −1 ) has been measured by the given formula 37,38 :

C_{s} goodbreak= ((), I goodbreak\times normalΔ t) / m

where C s , Δ t , i , and m are specific capacity (C g −1 ), (s) discharge time, (A) current, and the (g) mass of active samples.…”

Section: Methodsmentioning

confidence: 99%

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Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors

Kumar

Govindasamy

Pallavolu

et al. 2022

Intl J of Energy Research

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The doped metal materials/transitional metal sulfides have been regarded as unique superior-efficient electrodes because of their high Faradic activities.Nevertheless, the aggregation limits and poorer rate performances critically hinder the supercapacitors (SCs). Herein, the interior and interface coexisting design of cobalt-doped NiFe 2 S 4 nano sheets on nickel foam (Co-NiFe 2 S 4 ) was constructed and synthesized via a two-step hydrothermal approach. The Co-NiFe 2 S 4 served as the skeleton supports and conductive pathways and supplies plentifully coordination ions to block the aggregations and enhance the nanostructured stabilities. The results are auspicious: the electrodes showed quick ion and electron transportation rates and many electroactive surface regions, evidencing their superior electrochemical performances. Regarding the superiority in physical and chemical characterizations, the Co-NiFe 2 S 4 composite was attracted more attention than other SCs applications because of their suitable morphology for electron/ion transportations, safety, numerous redoxactive sites with varied oxidational states, lower-cost with nontoxicity, and high charge-discharge rates in electrochemical activities. Especially, the Co-NiFe 2 S 4 electrode demonstrated superior electrochemical performance of specific capacity of 1075.4 C g À1 (2329.6 F g À1 ) at 1 A g À1 and capacity retention of around 96.8% after 5000 long-cycles at 3 A g À1 . These results signify that the ternary construction, Co-NiFe 2 S 4 composite is a superior capacitor at higher stabilities with a very less loss in capacity retentions, which is a promising electrode as a nanomaterial for high-performance SCs that could be applicable in the commercial field soon.

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C_{s} goodbreak= ((), I goodbreak\times normalΔ t) / m

where C s , Δ t , i , and m are specific capacity (C g −1 ), (s) discharge time, (A) current, and the (g) mass of active samples.…”

Section: Methodsmentioning

confidence: 99%

“…The prepared rectangular electrode, Pt foil, and saturated calomel electrode are employed as the working, counter, and reference electrodes. Based on the GCD curve, the gravimetric specific capacity (C s , C g À1 ) has been measured by the given formula 37,38 :…”

Section: Electrochemical Performance Testmentioning

confidence: 99%

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors

Kumar

Govindasamy

Pallavolu

et al. 2022

Intl J of Energy Research

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“…The mass balance equation for the device is given by the below equation.

\frac{M_{+}}{M_{-}} = \frac{C_{-} normalx {ΔV}_{-}}{C_{+} normalx {ΔV}_{+}},

where C + and C − denote the specific capacitances, Δ V + and Δ V − denotes the active potential window of the positive and negative electrode materials, respectively 32,33 . According to the above equation, an optimum mass ratio of Co 3 O 4 and N‐CNO electrodes was calculated to be ~0.24.…”

Section: Methodsmentioning

confidence: 99%

“…where C + and C À denote the specific capacitances, ΔV + and ΔV À denotes the active potential window of the positive and negative electrode materials, respectively. 32,33 According to the above equation, an optimum mass ratio of Co 3 O 4 and N-CNO electrodes was calculated to be $0.24. The energy density and power density of a single electrode and the device are estimated from the below equation.…”

Section: Electrochemical Characterization and Device Fabricationmentioning

confidence: 99%

Superior energy‐power performance of N‐doped carbon nano‐onions‐based asymmetric and symmetric supercapacitor devices

Pallavolu

Neelima

Banerjee

et al. 2021

Intl J of Energy Research

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Summary Highly graphitic nitrogen‐doped carbon nano‐onions (N‐CNO) have attracted much attention in the field of energy storage device applications. Herein, we have synthesized N‐CNO by a simple flame pyrolysis method for symmetric and asymmetric (ASC) supercapacitor devices. The nitrogen doping is performed in‐situ during the pyrolysis of pyrrole. The synthesized N‐CNO has a high surface area of 49 m2 g−1 with 4 at% nitrogen content. The structural properties have confirmed the formation of graphitic N‐CNO with highly ordered concentric graphene layers with proper lattice spacing. The fabricated symmetric and asymmetric devices have shown high specific capacitance and excellent energy‐power performance. Especially, the ASC device shows a specific capacitance value 205 F g−1 with a high energy density (60 Wh kg−1) and power density (5.5 kW kg−1), leading to an increase in the power density by 260% for a mere 60% decrease in the energy density. In addition, both the novel symmetric and asymmetric devices have shown excellent capacity retention of 96% to 98% over 5000 cycles. The demonstrated results show the superior electrochemical performance of the active material, which indicates that the N‐rich‐CNOs can be used as a novel anode material in energy storage devices with high energy density and high power performance.

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“…The modern-day rapid development of humanity as a whole and the burning of fossil fuels has caused an enormous strain on the environment [1,2]. Therefore, with all determination, the Paris Accord [3] was proposed and duly signed by 196 signatories at Paris, France on 12 December 2015 and came into effect on 4 November 2016.…”

Section: Introductionmentioning

confidence: 99%

Integrated Vapor Compression Chiller with Bottoming Organic Rankine Cycle and Onsite Low-Grade Renewable Energy

et al. 2021

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The present study offers a scheme to improve the performance of existing large-scale chillers. The system involves raising the temperature of the chiller’s cooling water stream using renewable energy sources by incorporating an organic Rankine cycle (ORC). The thermal analysis was conducted by raising the temperature of one-third of the approximately 200 ton chiller’s cooling water. The investigation was considered for ORC evaporator inlet temperature of 90~120 °C by the step of 10 °C. Various working fluids for the different ORC evaporator inlet temperatures were examined. Sensitivity analyses conducted on the degree of superheating, degree of subcooling, condenser saturation temperature, pinch point temperature differences of the ORC evaporator and condenser, and the mass flowrates of the heating and cooling streams were also reported. Genetic algorithm was employed to carry out the optimization. The best options for the ORC working fluid at the heating source ORC evaporator inlet temperatures of 90 °C was found to be DME, presenting an improvement of 48.72% in comparison with the rated coefficient of performance (COP) value of the VCC, with a renewable energy input requirement of 710 kW. At the heat source temperatures of 100 °C and 110 °C, butene, which presented an improvement in the COP equal to 48.76% and 68.85%, respectively, with the corresponding renewable energy requirements of 789.6 kW and 852 kW, was found to be the ideal candidate. Meanwhile, at the heat source inlet temperature of 120 °C, R1233zd (E), representing an improvement of 140.88% with the renewable energy input of around 1061 kW, was determined to be the most favorable ORC working fluid candidate.

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Self-assembled and highly faceted growth of Mo and V doped ZnO nanoflowers for high-performance supercapacitors

Cited by 58 publications

References 86 publications

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors

Superior energy‐power performance of N‐doped carbon nano‐onions‐based asymmetric and symmetric supercapacitor devices

Integrated Vapor Compression Chiller with Bottoming Organic Rankine Cycle and Onsite Low-Grade Renewable Energy

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Self-assembled and highly faceted growth of Mo and V doped ZnO nanoflowers for high-performance supercapacitors

Cited by 58 publications

References 86 publications

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe 2 S 4 nanosheets for high‐performance supercapacitors

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe 2 S 4 nanosheets for high‐performance supercapacitors

Superior energy‐power performance of N‐doped carbon nano‐onions‐based asymmetric and symmetric supercapacitor devices

Integrated Vapor Compression Chiller with Bottoming Organic Rankine Cycle and Onsite Low-Grade Renewable Energy

Contact Info

Product

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Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors

Effectively constructed by the interior and interface coexisting design of cobalt‐doped NiFe ₂ S ₄ nanosheets for high‐performance supercapacitors