In situ fabrication of graphene decorated microstructured globe artichokes of partial molar nickel cobaltite anchored on a Ni foam as a high-performance supercapacitor electrode

Pinjari, Syedvali; Rajeshkhanna, G.; Umeshbabu, Ediga; Kiran, Gundla Uday; Rao, G. Ranga; Justin, P.

doi:10.1039/c5ra03463a

Cited by 59 publications

(36 citation statements)

References 59 publications

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“…S4d and S5d also show the spin-orbit doublets and shakeup satellites related to Ni 2+ and Ni 3+ ions present in the samples [27,49]. These results confirm the surface of NiCo 2 O 4 /rGO-NMP and NiCo 2 O 4 /rGO-DMF hybrid samples containing Co 2+ , Co 3+ , Ni 2+ , and Ni 3+ , which are in good agreement with the results reported in the literature [49,54].…”

Section: Resultssupporting

confidence: 94%

“…The characteristic oxygenated functional groups of GO, such as C=O (∼1728 cm −1 ) and C-OH (∼1398 cm −1 ) of carboxylic groups, C-O-C (∼1235 cm −1 ) of epoxy groups, C-O (∼1051 cm −1 ) of alkoxy groups, and O-H (∼3400 cm −1 ) of hydroxyl groups, are observed. In addition, the peak observed at C=C (∼1623 cm −1 ) is endorsed to the skeletal C=C vibration of unoxidized graphitic domains [49,54]. Except the C=C skeletal vibration, all other oxygenated functional groups have diminished greatly or disappeared in both NiCo 2 O 4 /rGO hybrid composites demonstrating a high degree of reduction of GO to rGO under solvothermal conditions.…”

Section: Resultsmentioning

confidence: 83%

“…The O2 component at 530.8 eV can arise from a variety of surface species including hydroxyls, chemisorbed oxygen, and undercoordinated lattice oxygen on the surface of the spinel [25]. The O3 component at 531.4 eV is essentially the signature of water bound to the surface of the sample [49,54]. Figures S4c and S5c clearly show the Co spin-orbit doublets as well as the shakeup satellite features of Co 2+ and Co 3+ ions in the samples [24,26].…”

Section: Resultsmentioning

confidence: 87%

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NiCo2O4/rGO hybrid nanostructures for efficient electrocatalytic oxygen evolution

Umeshbabu

Rajeshkhanna

Justin

et al. 2016

J Solid State Electrochem

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We report the synthesis of NiCo 2 O 4 /reduced graphene oxide (NiCo 2 O 4 /rGO) hybrid hierarchical structures with unique nanonet and microsphere morphologies by organic polar solvent-assisted solvothermal method. The electrocatalytic oxygen evolution reaction (OER) activity of these materials is studied by cyclic voltammetry, linear sweep voltammetry and chronoamperometry methods in O 2 -saturated 0.1 M KOH solution. The NiCo 2 O 4 /rGO hybrid nanocomposite materials are found to be highly active electrocatalysts for OER at lower overpotentials. The nanonet and microspherelike NiCo 2 O 4 /rGO catalysts require overpotentials of 0.450 and 0.530 V at a current density of 10 mA cm −2 , and their corresponding Tafel slopes are 53 and 62 mV dec −1 , which are much lower than values reported for non-precious electrocatalysts. Further, both NiCo 2 O 4 /rGO catalysts show good catalytic stability with current retention more than 92 % over long period of 15,000 s determined by chronoampirometry and at the end of 1000th cycle determined by linear sweep voltammetry. The enhanced OER activity of nanostructured NiCo 2 O 4 /rGO hybrid catalysts is attributed to synergistic interaction between rGO and NiCo 2 O 4 , which seems to be essential for maintaining the large contact area at the electrode-electrolyte interface, better mass, and charge transport and to minimize the aggregation of NiCo 2 O 4 nanoparticles.

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 87%

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NiCo2O4/rGO hybrid nanostructures for efficient electrocatalytic oxygen evolution

Umeshbabu

Rajeshkhanna

Justin

et al. 2016

J Solid State Electrochem

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“…But at high scan rate, the duration of OH -ion access is limited, resulting in a decreasing trend of capacitance as scan rate increases [28,29].…”

Section: Resultsmentioning

confidence: 98%

“…The anodic peak current versus square root of applied scan rate is linear, which suggest the electrochemical reaction is diffusion controlled [26]. The specific capacitance, Cs (F g -1 ) and areal capacitance, Ca (F cm -2 ) was calculated using the following formula [27,28],…”

Section: Resultsmentioning

confidence: 99%

Hierarchical CuCo2O4 nanobelts as a supercapacitor electrode with high areal and specific capacitance

Vijayakumar

Lee

Ryu

2015

Electrochimica Acta

290

113

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Chromium Oxynitride as Durable Electrode Material for Symmetric Supercapacitors

Kumar

Ramavath

Ghosh

et al. 2020

Batteries & Supercaps

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Recently, metal oxynitrides (MONs) have gained a lot of attention as electrode materials for supercapacitor (SC) applications due to their unique properties such as high electronic conductivity, wettability, corrosion resistance, and chemical robustness. Nanostructuring strategies of MONs opens fresh avenues for energy storage. Though various transition metal oxides (MO) and metal nitrides (MN) have been explored as electrode materials for SC applications, they have limitations associated with poor cyclability and rate capabilities. Hence, there is a value to exploring intermediate oxynitride compounds (MONs) in place of pure MOs and MNs. Chromium oxynitride (CrOXNY) as electrode material is not yet been explored for SC applications. In this context, we have carried out the systematic study of the nanostructured nano‐spherical CrOXNY nanoparticle as an electrode material for SC applications. The electrochemical performance of the CrOXNY electrode is tested in both the three and two electrode assembly. The CrOXNY electrode shows capacitance of 146 F g−1 at 10 mV s−1 in three electrode configuration. The symmetric coin cell (CR2032) is fabricated and tested up to 10,000 cycles at 2 A g−1 and it shows excellent capacity retention up to 98 %. The energy and power densities of the symmetric device are ∼8 W h kg−1 at 1 A g−1 and 28.8 kW kg−1 at 10 A g−1, respectively. As a proof of concept, a red light‐emitting diode (LED) is lit by serially connecting two symmetric coin cells (2 V). These attributes of CrOXNY, such as excellent capacitance retention, long cyclic stability, and high rate capability, indicates that it can be used as a durable electrode material for SC technology.

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In situ fabrication of graphene decorated microstructured globe artichokes of partial molar nickel cobaltite anchored on a Ni foam as a high-performance supercapacitor electrode

Abstract: 3D microstructured globe artichokes of a rGO/Ni0.3Co2.7O4 composite were synthesized through a hydrothermal method to contribute an efficient work nature as supercapacitor electrodes.

Cited by 59 publications

References 59 publications

NiCo2O4/rGO hybrid nanostructures for efficient electrocatalytic oxygen evolution

NiCo2O4/rGO hybrid nanostructures for efficient electrocatalytic oxygen evolution

Hierarchical CuCo2O4 nanobelts as a supercapacitor electrode with high areal and specific capacitance

Chromium Oxynitride as Durable Electrode Material for Symmetric Supercapacitors

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