Bullet-like microstructured nickel ammonium phosphate/graphene foam composite as positive electrode for asymmetric supercapacitors

Mahmoud, Badr Ahmed; Mirghni, Abdulmajid Abdallah; Fasakin, Oladepo; Oyedotun, Kabir O.; Manyala, Ncholu I.

doi:10.1039/d0ra02300k

Cited by 25 publications

(10 citation statements)

References 57 publications

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“…Figure 6A shows, in particular, the CV performances of pure MnAP, MnAP@GQD1, MnAP@GQD2, MnAP@GQD3, and MnAP@GQD4 at 5 mV s −1 . It is noticed that all hybrid electrodes show pseudocapacitive behavior with distinct redox peaks, 59 which is due to the adsorption and interaction of H + , and

{SO}_{4}^{2 -}

electrolyte ions with Mn 2+ states 33,46 . The anodic and cathodic peak potential differences and the corresponding increase in areas under the CV curve (Figure 6C) are in direct proportion with the scan rate revealing that the CV process is said to have quasi‐reversibility 60 …”

Section: Resultsmentioning

confidence: 94%

“…Beyond 75 mg (ie, 100 mg), the areas under these bands have reduced drastically, suggesting that 100 mg (higher mass concentration) could not have coordination with MnAP lattice sites revealing that 75 mg GQD appears to be the optimal mass concentration dispersoid for MnAP 41‐43 . The bands found at 1440 and 2963 cm −1 correspond to NH bending and stretching, 44,45 and 529 and 1027 cm −1 bands correspond to

{PO}_{4}^{3 -}

bending and stretching 46 . The OH bending and stretching modes at 1580 and 2963 cm −1 refer to the hydrated presence in the composite 47 …”

Section: Resultsmentioning

confidence: 99%

“…It is noticed that all hybrid electrodes show pseudocapacitive behavior with distinct redox peaks, 59 which is due to the adsorption and interaction of H + , and SO 2À 4 electrolyte ions with Mn 2+ states. 33,46 The anodic and cathodic peak potential differences and the corresponding increase in areas under the CV curve (Figure 6C) are in direct proportion with the scan rate revealing that the CV process is said to have quasi-reversibility. 60 In the second step, the GCD is recorded for different current densities of all hybrid electrodes.…”

Section: Half-cell Tests Of Mnap Andmentioning

confidence: 99%

“…[41][42][43] The bands found at 1440 and 2963 cm À1 correspond to N H bending and stretching, 44,45 and 529 and 1027 cm À1 bands correspond to PO 3À 4 bending and stretching. 46 The O H bending and stretching modes at 1580 and 2963 cm À1 refer to the hydrated presence in the composite. 47 The authors calculated in-plane crystallite size (La) of the graphitic planes for the pronounced I D /I G ratios as shown (Figure 2) such as 0.98 <1.03> 1.01 using the relation (1).…”

Section: Raman Studiesmentioning

confidence: 99%

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Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Raja

Vickraman

2022

Intl J of Energy Research

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The hybrid electrodes MnAP@GQD x are synthesized through microwave route for four graphene quantum dots (GQD) variates (x = 25, 50, 75, and 100 mg). The Debye-Scherrer calculations show lower crystallite size for MnAP at 75 mg GQD. In Raman studies, among all GQD variates the 75 mg GQD doped MnAP composite reveal higher I D /I G ratio (1.03). The electrochemical performance shows higher specific capacitance 596 Fg À1 at 1 Ag À1 for it. Thus, XRD, Raman, and CV studies identified 75 mg GQD as the appropriate mass dispersoid for MnAP lattice. This optimized MnAP at 75 mg GQD has been subjected to scanning electron microscopy (SEM), transmission electron microscopy (TEM), brunauer-emmet-teller (BET), and X-ray Photoelectron Spectroscopy (XPS). The SEM shows broken rectangular micro platelets for MnAP, and its disintegration after doping GQD x¼75 mg shows strong complexation. The BET study reveals mesoporosity (3 nm) favoring for better ionic transport, and the XPS accounts for the oxidation states. In full-cell, MnAP@GQD x¼75 mg as a positrode // rGO negatrode, has shown 442 Fg À1 at 1 Ag À1 in 3M H 2 SO 4 at 0-1.8 V. Further enhancement 693 Fg À1 in it, is achieved by dispersing dual redox additives 0.025M (KI/VOSO 4 ) in 3M H 2 SO 4 with 311 Wh kg À1 /450 W kg À1 at 1 Ag À1 and having the capacity retention 82% for 5000 cycles at 20 Ag À1 . Thus, increase in specific capacitance for this optimized electrode is observed for dual redox additives in 3M H 2 SO 4 suggestive for high-performance supercapattery applications.

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{SO}_{4}^{2 -}

Section: Resultsmentioning

confidence: 94%

{PO}_{4}^{3 -}

bending and stretching 46 . The OH bending and stretching modes at 1580 and 2963 cm −1 refer to the hydrated presence in the composite 47 …”

Section: Resultsmentioning

confidence: 99%

Section: Half-cell Tests Of Mnap Andmentioning

confidence: 99%

Section: Raman Studiesmentioning

confidence: 99%

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Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Raja

Vickraman

2022

Intl J of Energy Research

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“…Available reports on Ni and Co phosphate-based composite materials are summarized in Table 5. 79,133–168…”

Section: Nickel/cobalt-based Phosphate Materials For Hybrid Supercapa...mentioning

confidence: 99%

Transition nickel/cobalt phosphates: an advanced cathode for hybrid supercapacitors

Marje,

Tyagaraj,

Hwang

et al. 2023

J. Mater. Chem. A

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Unraveling CoNiP‒CoP₂ 3D‐on‐1D Hybrid Nanoarchitecture for Long‐Lasting Electrochemical Hybrid Cells and Oxygen Evolution Reaction

et al. 2022

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Evolving cost-effective transition metal phosphides (TMPs) using general approaches for energy storage is pivotal but challenging. Besides, the absence of noble metals and high electrocatalytic activity of TMPs allow their applicability as catalysts in oxygen evolution reaction (OER). Herein, CoNiP-CoP 2 (CNP-CP) composite is in situ deposited on carbon fabric by a one-step hydrothermal technique. The CNP-CP reveals hybrid nanoarchitecture (3D-on-1D HNA), i.e., cashew fruit-like nanostructures and nanocones. The CNP-CP HNA electrode delivers higher areal capacity (82.8 𝝁Ah cm -2 ) than the other electrodes. Furthermore, a hybrid cell assembled with CNP-CP HNA shows maximum energy and power densities of 31 𝝁Wh cm -2 and 10.9 mW cm -2 , respectively. Exclusively, the hybrid cell demonstrates remarkable durability over 30 000 cycles. In situ/operando X-ray absorption near-edge structure analysis confirms the reversible changes in valency of Co and Ni elements in CNP-CP material during real-time electrochemical reactions. Besides, a quasi-solid-state device unveils its practicability by powering electronic components. Meanwhile, the CNP-CP HNA verifies its higher OER activity than the other catalysts by revealing lower overpotential (230 mV). Also, it exhibits relatively small Tafel slope (38 mV dec -1 ) and stable OER activity over 24 h. This preparation strategy may initiate the design of advanced TMP-based materials for multifunctional applications.

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Bullet-like microstructured nickel ammonium phosphate/graphene foam composite as positive electrode for asymmetric supercapacitors

Abstract: Unique morphology of (Ni(NH4)2(PO3)4·4H2O/60GF) as a positive electrode for high-performance asymmetric supercapacitors.

Cited by 25 publications

References 57 publications

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Transition nickel/cobalt phosphates: an advanced cathode for hybrid supercapacitors

Unraveling CoNiP‒CoP₂ 3D‐on‐1D Hybrid Nanoarchitecture for Long‐Lasting Electrochemical Hybrid Cells and Oxygen Evolution Reaction

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Bullet-like microstructured nickel ammonium phosphate/graphene foam composite as positive electrode for asymmetric supercapacitors

Abstract: Unique morphology of (Ni(NH4)2(PO3)4·4H2O/60GF) as a positive electrode for high-performance asymmetric supercapacitors.

Cited by 25 publications

References 57 publications

Role of dual redox additivesKI/VOSO4in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO4in manganese ammonium phosphate at graphene quantum dots for supercapattery

Transition nickel/cobalt phosphates: an advanced cathode for hybrid supercapacitors

Unraveling CoNiP‒CoP2 3D‐on‐1D Hybrid Nanoarchitecture for Long‐Lasting Electrochemical Hybrid Cells and Oxygen Evolution Reaction

Contact Info

Product

Resources

About

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Role of dual redox additivesKI/VOSO₄in manganese ammonium phosphate at graphene quantum dots for supercapattery

Unraveling CoNiP‒CoP₂ 3D‐on‐1D Hybrid Nanoarchitecture for Long‐Lasting Electrochemical Hybrid Cells and Oxygen Evolution Reaction