Porous CeNiO<sub>3</sub> with an enhanced electrochemical performance and prolonged cycle life (&gt;50 000 cycles) <i>via</i> a lemon-assisted sol–gel autocombustion method

Harikrishnan, M. P.; Bose, A. Chandra

doi:10.1039/d2nj02295h

Cited by 6 publications

(29 citation statements)

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“…The internal diffusion resistance of the electrode material causes this shift in peaks 41,52 . The broadened anodic peaks for all the scan rates in Figure 7A indicate the fast faradaic oxidation of Ce 3+ to Ce 4+ and Ni 2+ to Ni 3+ reaction 3,50 . The excessive intercalation of oxygen into the perovskite structure brings on the fast faradaic oxidation reaction of Ce and Ni to higher valance states.…”

Section: Resultsmentioning

confidence: 97%

“…The better electrochemical behavior of the CeNiO 3 electrode is due to the mixed‐valence states of cations in the A and B sites. Perovskite structure with oxygen vacancies causes the fast reversible faradaic reaction of Ce 3+ /Ce 4+ and Ni 2+ /Ni 3+ , and it accounts to the battery‐like behavior of the electrode 3 …”

Section: Resultsmentioning

confidence: 99%

“…The excessive intercalation of oxygen into the perovskite structure brings on the fast faradaic oxidation reaction of Ce and Ni to higher valance states. Sharp reduction peak at 0.62 V is caused by the reduction of Ce 4+ to Ce 3+ , and Ni 3+ to Ni 2+ , respectively 3,10 . The mixed‐valence state of the active material enhances the electrochemical performance by the fast faradaic redox reaction due to the oxygen intercalation in the perovskite structure 31 .…”

Section: Resultsmentioning

confidence: 99%

“…The specific capacity is calculated using Equations () and () for three‐electrode system, 3,32 respectively.

Cs = I ∆ t / m

Cs = \frac{\int IdV}{italicmv}

A symmetry cell was designed by CeNiO 3 @Ni as the anode and cathode. In this two‐electrode system, the CV achieves a potential of 1.55 V at various sweep rates, and GCD achieves a potential range of 1.55 V at various A g −1 .…”

Section: Methodsmentioning

confidence: 99%

“…The energy density is determined using Equation () and power density is determined using Equation () 3,32

E = \frac{I \int Vdt}{3.6 M}

P = \frac{3600 E}{∆ t}

…”

Section: Methodsmentioning

confidence: 99%

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Binder‐free synthesis of cerium nickel oxide for supercapattery devices

Harikrishnan

Bose

2022

Intl J of Energy Research

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High-performance supercapatteries have gained excellent research interest due to their high energy-power delivering capability, rapid charge/discharge, and prolonged cycle life. However, their low specific capacitance, poor rate capability, and inferior energy density of the electrode material constrained their practicality. In numerous energy storage devices, perovskite oxides achieve great importance due to their structural stability and electron conductivity. In the present work, binder-free CeNiO 3 (CNO) nanoparticles are grown on Ni-foam as a supercapattery electrode material. The CNO nanoparticles are successfully grown on Ni-foam as a current collector using a one-step hydrothermal method and an annealing process. This nanostructured perovskite oxide in the Ni-foam reduces the agglomeration and provides efficient pathways for fast charge transport. The synergistic effect, and varying valence states of Ce and Ni in the perovskite structure elucidate fast charge transfer kinetics. The CNO@Ni-foam electrode exhibits the highest specific capacity of 278 C g À1 at 1 A g À1 in a 6 M KOH electrolyte. Further, the constructed symmetric cell CNO//CNO operates at 1.55 V and exhibits high specific capacity (179.81 C g À1 ), high energy density (38.70 W h kg À1 ), and high-power density (7750 W kg À1 ) with long cycle durability (20 000 cycles). The supercapattery exhibits outstanding rate capability and good cyclic stability of 92% from its maximum specific capacity at a current density of 5 A g À1 .

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%