Perovskite La1−xKxCoO3−δ (0 ≤ x ≤ 0.5): a novel bifunctional OER/ORR electrocatalyst and supercapacitive charge storage electrode in a neutral Na2SO4 electrolyte

Mondal, Rakesh; Mishra, Neeraj Kumar; Singh, Mahatim; Gupta, Asha; Singh, Preetam

doi:10.1039/d2cp04708j

Cited by 10 publications

(4 citation statements)

References 66 publications

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“…In eqs and , k 1 is due to the surface capacitive charge storage and k 2 is the diffusion-controlled charge storage. The values of k 1 and k 2 are calculated from the slope and y -intercept of the i (ν)/(ν) 0.5 vs (ν) 0.5 curve. − The deconvoluted CV curve at 10 mV/s scan rate is shown in Figure c. The deconvoluted CV curves at 5, 15, 20, 25, 30, 35, 40, 45, and 50 mV/s scan rates are shown in Figure S5.…”

Section: Resultsmentioning

confidence: 99%

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Ajin,

Balamurugan,

Chandra Bose

2023

ACS Appl. Energy Mater.

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Owing to the high power density and long cycle stability, supercapacitors are promising energy storage devices instead of electrochemical batteries. In recent years, perovskite materials have received good attention in the research community for pseudocapacitive electrode material. Especially, these materials, having a high oxygen vacancy concentration, exhibit ultra-high capacitance due to oxygen-anion intercalations. In this study, La2NiCrO6 (LNC) double perovskites are successfully synthesized using the sol–gel method followed by the solid–state reaction at different concentrations of citric acid. The interconnected spherical granular-structured LNC is an efficient supercapacitor electrode material because of its stress-free octahedron lattice and inherent oxygen vacancies. In a three-electrode system, LNC@Ni-foam reveals a specific capacity of 529 C g–1 (147 mA h g–1) at a current density of 1 A g–1. To exhibit a real-time application, a device is fabricated with LNC@Ni-foam as a positive electrode and activated carbon (AC) AC@Ni-foam as a negative electrode. This asymmetric device can achieve the specific capacity of 227 C g–1 (63 mA h g–1) at a current density of 1 A g–1. The fabricated device exhibits an energy density of 49.17 W h kg–1 at a power density of 779.79 W kg–1. In addition, the as-fabricated device has a cycle stability of 97% even after 10,000 cycles at a current density of 10 A g–1. These superior electrochemical performances promise the application of this LNC electrode in pseudocapacitors.

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Section: Resultsmentioning

confidence: 99%

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Ajin,

Balamurugan,

Chandra Bose

2023

ACS Appl. Energy Mater.

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“…The full spectrum in Figure b shows that PPy700@SFO@CC contains Fe, Sr, O, C, and N elements, confirming that PPy was successfully electrodeposited onto SrFeO 3−δ @CC Figure c displays the O 1s spectra, which can be divided into two contributions: O latt and O ads , representing lattice oxygen and defect oxygen, respectively . There is a positive correlation between O ads and oxygen vacancy .…”

Section: Resultsmentioning

confidence: 99%

Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO_3−δ Perovskites on Carbon Cloth

Qiao,

He,

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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The defective structure and high oxygen vacancy concentration of SrFeO 3−δ perovskite enable fast ion-electron transport, but its low conductivity still hinders the high electrochemical performance. Herein, to enhance the conductivity of SrFeO 3−δ -based electrodes, polypyrrole-modified SrFeO 3−δ perovskite on carbon cloth (PPy@SFO@CC) has been successfully fabricated by electrodeposition of polypyrrole (PPy) on the surface of SFO@CC. The optimal PPy700@SFO@CC electrode exhibits a specific capacitance of 421 F g −1 at 1 A g −1 . It was found that the outside PPy layer not only accelerates the electron transport and ion diffusion but also creates more oxygen vacancies in SrFeO 3−δ , enhancing the charge storage performance significantly. Moreover, the NiCo 2 O 4 @CC//PPy700@SFO@CC device maintains a specific capacitance of 63.6% after 3000 cycles, which is ascribed to the weak adhesion forces between the active materials and carbon cloth. Finally, the all-solid-state flexible supercapacitor NiCo 2 O 4 @CC//PPy700@SFO@CC is constructed with PVA-KOH as the solid electrolyte, delivering an energy density of 16.9 W h kg −1 at a power density of 984 W kg −1 . The flexible supercapacitor retains 69% of its specific capacitance after 1000 bending and folding times, demonstrating a certain degree of foldability. The present study opens new avenues for perovskite oxide-based flexible all-solid-state supercapacitors.

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“…Figure 2 shows the core level spectra of B site metal ions and oxygen ions of Co-doped Pr 0.7 Ca 0.3 MnO 3−d . The core level spectra of the Co 2p1/2 states were observed at 790 eV to 810 eV and consisted of three peaks at 796.4 eV, 794.9 eV, 797.4 eV, and 802.5 eV that can be assigned to Co 2+ , Co 3+ , Co 4+, and satellite [18,19]. The Mn 2p2/3 spectrum consists of three peaks at 640.3, 641.7, and 643.8 eV that can be assigned to Mn 2+ , Mn 3+, and Mn 4+ ions [20].…”

Section: Resultsmentioning

confidence: 99%

Oxygen-Bonding State and Oxygen-Reduction Reaction Mechanism of Pr0.7Ca0.3Mn1−xCoxO3−d (x = 0, 0.1, 0.2, 0.3)

Jo,

Lee,

Lee

2023

Ceramics

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We investigated the effects of Co doping on Pr0.7Ca0.3MnO3−d in the perspective of an oxygen-bonding state change. In all compositions, Pr0.7Ca0.3Mn1−xCoxO3−d (PCMCx, x = 0, 0.1, 0.2, 0.3) showed an orthorhombic structure, and the lattice gradually contracted with increasing Co content. The doped Co was mostly present as 2+ and 3+, which decreased the average oxidation value of the B site and created oxygen vacancies for charge compensation. However, as the Co content increased, the proportion of Co3+ increased, and the content of oxygen vacancies gradually decreased. In addition, the ratio of adsorbed oxygen in PCMC0.1 was the highest, and the B-O covalency was enhanced. Accordingly, the electrochemical reaction of oxygen with the cathode material in PCMC0.1 could occur most easily, showing the smallest polarization resistance among the Co-doped Pr0.7Ca0.3MnO3−d. We can confirm the formation of oxygen vacancies via Co doping and the effect of B-O covalency on the oxygen-reduction reaction of Pr0.7Ca0.3MnO3−d.

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Perovskite La_1−xK_xCoO_3−δ (0 ≤ x ≤ 0.5): a novel bifunctional OER/ORR electrocatalyst and supercapacitive charge storage electrode in a neutral Na₂SO₄ electrolyte

Abstract: The as-prepared La1-xKxCoO3- (0≤x≤0.5) showed superior pseudocapacitive charge storage capacity in neutral 0.5M Na2SO4 electrolyte and superior electrocatalytic activities for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR)...

Cited by 10 publications

References 66 publications

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO_3−δ Perovskites on Carbon Cloth

Oxygen-Bonding State and Oxygen-Reduction Reaction Mechanism of Pr0.7Ca0.3Mn1−xCoxO3−d (x = 0, 0.1, 0.2, 0.3)

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Perovskite La1−xKxCoO3−δ (0 ≤ x ≤ 0.5): a novel bifunctional OER/ORR electrocatalyst and supercapacitive charge storage electrode in a neutral Na2SO4 electrolyte

Abstract: The as-prepared La1-xKxCoO3- (0≤x≤0.5) showed superior pseudocapacitive charge storage capacity in neutral 0.5M Na2SO4 electrolyte and superior electrocatalytic activities for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR)...

Cited by 10 publications

References 66 publications

Tailoring the Perovskite Structure to Acquire an Inorganic La2NiCrO6 Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Tailoring the Perovskite Structure to Acquire an Inorganic La2NiCrO6 Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO3−δ Perovskites on Carbon Cloth

Oxygen-Bonding State and Oxygen-Reduction Reaction Mechanism of Pr0.7Ca0.3Mn1−xCoxO3−d (x = 0, 0.1, 0.2, 0.3)

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Perovskite La_1−xK_xCoO_3−δ (0 ≤ x ≤ 0.5): a novel bifunctional OER/ORR electrocatalyst and supercapacitive charge storage electrode in a neutral Na₂SO₄ electrolyte

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Tailoring the Perovskite Structure to Acquire an Inorganic La₂NiCrO₆ Double Perovskite as an Efficient Energy Storage Application by Varying Molar Concentrations of Citric Acid

Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO_3−δ Perovskites on Carbon Cloth