Hierarchical MCo2O4@Ni(OH)2 (M = Zn or Mn) core@shell architectures as electrode materials for asymmetric solid-state supercapacitors

Baasanjav, Erdenebayar; Bandyopadhyay, Parthasarathi; Cho, Jung Sang; Jeong, Sang Mun

doi:10.1016/j.est.2021.103345

Cited by 9 publications

(12 citation statements)

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“…The Co 0.5 –Ni 3 S 2 //AC asymmetric device exhibits a maximum energy density of 60.3 W h kg −1 (20 mA cm −2 ) at a power density of 1944.3 W kg −1 (50 mA cm −2 ) and 36.0 W h kg −1 at a power density of 4309 W kg −1 . The energy ( E , W h kg −1 ) and power densities ( P , W kg −1 ) are calculated based on the discharge curve using Equations (4) and (5), respectively [ 78 ]:

where, I ,

, m , and t are the discharge current (mA), integral area under the discharge curve, masses, and discharging time (s), respectively. The results are comparable or even superior to those of previously reported supercapacitors ( Table 2 ), such as the rGO@Ni 3 S 2 //AC (37.19 W h kg −1 at 399.9 W kg −1 ), Ni 3 S 2 //AC (36 W h kg −1 at 400 W kg −1 ), and Ni 3 S 2 @CoS//AC (23.69 W h kg −1 at 268.95 W kg −1 ) devices [ 66 , 79 , 80 , 81 , 82 , 83 , 84 , 85 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Co 0.5 -Ni 3 S 2 //AC asymmetric device exhibits a maximum energy density of 60.3 W h kg −1 (20 mA cm −2 ) at a power density of 1944.3 W kg −1 (50 mA cm −2 ) and 36.0 W h kg −1 at a power density of 4309 W kg −1 . The energy (E, W h kg −1 ) and power densities (P, W kg −1 ) are calculated based on the discharge curve using Equations ( 4) and (5), respectively [78]:…”

Section: Resultsmentioning

confidence: 99%

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Facile In Situ Synthesis of Co(OH)2–Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors

et al. 2021

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Ni3S2 nanowires were synthesized in situ using a one-pot hydrothermal reaction on Ni foam (NF) for use in supercapacitors as a positive electrode, and various contents (0.3−0.6 mmol) of Co(OH)2 shells were coated onto the surfaces of the Ni3S2 nanowire cores to improve the electrochemical properties. The Ni3S2 nanowires were uniformly formed on the smooth NF surface, and the Co(OH)2 shell was formed on the Ni3S2 nanowire surface. By direct NF participation as a reactant without adding any other Ni source, Ni3S2 was formed more closely to the NF surface, and the Co(OH)2 shell suppressed the loss of active material during charging–discharging, yielding excellent electrochemical properties. The Co(OH)2–Ni3S2/Ni electrode produced using 0.5 mmol Co(OH)2 (Co0.5–Ni3S2/Ni) exhibited a high specific capacitance of 1837 F g−1 (16.07 F cm−2) at a current density of 5 mA cm−2, and maintained a capacitance of 583 F g−1 (16.07 F cm−2) at a much higher current density of 50 mA cm−2. An asymmetric supercapacitor (ASC) with Co(OH)2–Ni3S2 and active carbon displayed a high-power density of 1036 kW kg−1 at an energy density of 43 W h kg−1 with good cycling stability, indicating its suitability for use in energy storage applications. Thus, the newly developed core–shell structure, Co(OH)2–Ni3S2, was shown to be efficient at improving the electrochemical performance.

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where, I ,

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Facile In Situ Synthesis of Co(OH)2–Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors

et al. 2021

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“…5,45 Figure 5c shows a typical linear relationship for both the peak current (anodic/cathodic) densities versus (scan rate) 1/2 as achieved upon varying the scan rates by the Ni−Co−Se, Ni−Co−S, and Ni−Co−P electrodes, indicating their dominant diffusion-controlled redox reaction process. 4,56 The GCD profiles of Ni−Co−Se NAs and other samples for a fixed operating voltage regime of 0−0.45 V are plotted in Figures 5d and S14b,d, and f. The symmetric pattern of the GCD curves of TMCs and TMP indicates a highly reversible charge−discharge feature with good Coulombic efficiencies.…”

Section: Methodsmentioning

confidence: 98%

“…It is reported that NC is an excellent negative material due to its large surface area, high electron conductivity, and good electrochemical properties. 4,8 The NC negative electrode exhibited a deviated-rectangular feature within the voltage window of −1.0 to 0.0 V, featuring the electrical double-layer capacitive nature accompanied by a slight pseudocapacitive nature (Figure S17), whereas the Ni− Co−Se NAs delivered noticeable redox peaks within the window regime of −0.2 to 0.75 V, demonstrating its typical battery-like feature. 27 Therefore, the Ni−Co−Se NAs//NC hybrid device could have the potential to deliberately enlarge the working voltage window, thereby improving the energy density (Figure S17c).…”

Section: Methodsmentioning

confidence: 99%

Experimental and Theoretical Insights of Anion Regulation in MOF-Derived Ni–Co-Based Nanosheets for Supercapacitors and Anion Exchange Membrane Water Electrolyzers

Bandyopadhyay

Senthamaraikannan

Baasanjav

et al. 2023

ACS Appl. Mater. Interfaces

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The anionic components have a significant role in regulating the electrochemical properties of mixed transition-metal (MTM)-based materials. However, the relationship between the anionic components and their inherent electrochemical properties in MTM-based materials is still unclear. Herein, we report the anion-dependent supercapacitive and oxygen evolution reaction (OER) properties of in situ grown binary Ni–Co–selenide (Se)/sulfide (S)/phosphide (P) nanosheet arrays (NAs) over nickel foam starting from MOF-derived Ni–Co layered double hydroxide precursors. Among them, the Ni–Co–Se NAs exhibited the best specific capacity (289.6 mA h g–1 at 4 mA cm–2). Furthermore, a hybrid device constructed with Ni–Co–Se NAs delivered an excellent energy density (74 W h kg–1 at 525 W kg–1) and an ultra-high power density (10 832 W kg–1 at 46 W h kg–1) with outstanding durability (∼94%) for 10 000 cycles. Meanwhile, the Ni–Co–Se NAs showed superior electrocatalytic OER outputs with the lowest overpotential (235 mV at 10 mA cm–2) and Tafel slope. In addition, Ni–Co–Se NAs outperformed IrO2 as an anode in an anion exchange membrane water electrolyzer at a high current density (>1.0 A cm–2) and exhibited a stable performance up to 48 h with a 99% Faraday efficiency. Theoretical analyses validate that the Se promotes OH adsorption and improves the electrochemical activity of the Ni–Co–Se through a strong electronic redistribution/hybridization with an active metal center due to its valence 4p and inner 3d orbital participations. This study will provide in-depth knowledge of bifunctional activities in MTM-based materials with different anionic substitutions.

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“…As the mechanism occurs at the electrode, the structure, quality, and nature of the electrode engage in a vital role for better supercapacitor performance . Therefore, different varieties of electrode materials like metal/metal oxides, , layered doubled hydroxides, , MXenes, , metal–organic frameworks (MOFs), − MXene and MOF composites, transition metal dichalcogenide, polymers, composites of transition metal oxides with 3D graphene materials or porous carbon nanofibers, − and composite of metal oxides/sulfides/phosphides/nitrides/selenides − have been recently designed to achieve high-density supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Ligand-Controlled Growth of Different Morphological Bimetallic Metal–Organic Frameworks for Enhanced Charge-Storage Performance and Quasi-Solid-State Hybrid Supercapacitors

Sahoo

Jeong

2023

ACS Appl. Mater. Interfaces

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The present research work facilitates a ligand-mediated effective strategy to achieve different morphological surface structures of bimetallic (Ni and Co) metal–organic frameworks (MOFs) by utilizing different types of organic ligands like terephthalic acid (BDC), 2-methylimidazole (2-Melm), and trimesic acid (BTC). Different morphological structures, rectangular-like nanosheets, petal-like nanosheets, and nanosheet-assembled flower-like spheres (NSFS) of NiCo MOFs, are confirmed from the structural characterization for ligands BDC, 2-Melm, and BTC, respectively. The basic characterization studies like scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and Brunauer–Emmett–Teller revealed that the NiCo MOF prepared by using trimesic acid as the ligand (NiCo MOF_BTC) with a long organic linker exhibits a three-dimensional architecture of NSFS that possesses higher surface area and pore dimensions, which enables better ion kinetics. Also, the NiCo MOF_BTC delivered the highest capacity of 1471.4 C g–1 (and 408 mA h g–1) at 1 A g–1 current density, compared to the other prepared NiCo MOFs and already reported different NiCo MOF structures. High interaction of trimesic acid with the metal ions confirmed from ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy leads to a NSFS structure of NiCo MOF_BTC. For practical application, an asymmetric supercapacitor device (NiCo MOF_BTC//AC) is fabricated by taking NiCo MOF_BTC and activated carbon as the positive and negative electrode, respectively, where the PVA + KOH gel electrolyte serves as a separator as well as an electrolyte. The device delivered an outstanding energy density of 78.1 Wh kg–1 at a power density of 750 W kg–1 in an operating potential window of 1.5 V. In addition, it displays a long cycle life of 5000 cycles with only 12% decay of the initial specific capacitance. Therefore, these findings manifest the morphology control of MOFs by using different ligands and the mechanism behind the different morphologies that will provide an effective way to synthesize differently structured MOF materials for future energy-storage applications.

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Hierarchical MCo2O4@Ni(OH)2 (M = Zn or Mn) core@shell architectures as electrode materials for asymmetric solid-state supercapacitors

Cited by 9 publications

References 55 publications

Facile In Situ Synthesis of Co(OH)2–Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors

Facile In Situ Synthesis of Co(OH)2–Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors

Experimental and Theoretical Insights of Anion Regulation in MOF-Derived Ni–Co-Based Nanosheets for Supercapacitors and Anion Exchange Membrane Water Electrolyzers

Ligand-Controlled Growth of Different Morphological Bimetallic Metal–Organic Frameworks for Enhanced Charge-Storage Performance and Quasi-Solid-State Hybrid Supercapacitors

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