Preparation of mesoporous microspheres of NiO with high surface area and analysis on their pseudocapacitive behavior

Abbas, Syed Asad; Jung, Kwang‐Deog

doi:10.1016/j.electacta.2016.02.054

Cited by 47 publications

(45 citation statements)

References 33 publications

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“…Ni Pourbaix diagrams have been simulated many times over the last fifty years, 1,[30][31][32] where the experimental ∆ f G's are used. However, none of these Ni Pourbaix diagrams are consistent with various electrochemical observations, e.g., NiO and/or Ni(OH) 2 should be stable at pH 5 ∼ 15, [24][25][26]29,[33][34][35][36][37][38][39][40][41][42] while, in those simulated Ni Poubaix diagrams with a moderate aqueous ion concentration ([I] = 10 −6 mol/L), Ni(OH) 2 is only stable at pH 3 of 9 ∼ 13. 1,30,31 These failures have important consequences because solutions with pH > 13 are critically important for the synthesis, characterization, and application of Ni (hydr)oxides.…”

Section: Introductionsupporting

confidence: 77%

“…Furthermore, the two dissolution boundaries of the metastable NiO are at pH 9.1 and 11.9 (not shown) significantly differ from those obtained at the DFT level. Although Ni(OH) 2 is more frequently reported in experiment, [24][25][26]29,70 NiO and Ni(OH) 2 probably coexist in many electrochemical experiments 36-39 due to their comparable close ∆µ's and the fact that it is challenging to completely differentiate them using conventional experimental methods (e.g., Raman spectroscopy). 39 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 may contribute to the scatter in the experimental data for the Ni(OH) 2 →NiOOH oxidation potential ( Fig.…”

Section: Resultsmentioning

confidence: 99%

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Improved Electrochemical Phase Diagrams from Theory and Experiment: The Ni–Water System and Its Complex Compounds

et al. 2017

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Electrode potential-pH (Pourbaix) diagrams provide a phase map of the most stable compounds of a metal, its corrosion products, and associated ions in solution. The utility of these phase diagrams is that they enable the assessment of electrochemical stabilities, for example, of Ni metal and its derived oxides, hydroxides, oxyhydroxides, against corrosion in aqueous environments. Remarkably, the Ni Pourbaix diagrams reported over the last 50 years are largely inconsistent with various electrochemical observations, which may be attributed to inaccurate experimental free energies of formation (∆ f G)for the complex Ni-based compounds used in producing the available diagrams. Here we show that state-of-the-art density-functional theory (DFT) can be used to obtain accurate ∆ f G values, which lead to Ni Pourbaix diagrams that are more consistent with direct electrochemical exeriments: Electrochemical impedance spectroscopy and surfaceenhanced Raman spectroscopy are used to characterize the electrochemical stabilities of NiO and Ni(OH) 2 formed on Ni, demonstrating the reliability in correction-free first-principles based Pourbaix diagrams. Our results show the importance in applying modern density functionals in combination with experimental advances in aqueous environment compound identification for assessing electrochemical phase stability of materials, which will be useful for the design, synthesis, and selection of corrosionresistant metals, photoabsorbers, and photocatalytic materials.

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Section: Introductionsupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Improved Electrochemical Phase Diagrams from Theory and Experiment: The Ni–Water System and Its Complex Compounds

et al. 2017

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“…Fig. 4a shows the CV curves of the NiO architecture at different scan rates in the range of 0.1-0.55 V. The distinct redox peaks reveal that the capacitive response of the NiO architecture results from pseudocapacitance based on the surface oxidation/reduction reactions of Ni 2+ and Ni 3+ , [3,13].…”

Section: Resultsmentioning

confidence: 98%

“…Recently, metal-organic frameworks have proven to be effective precursors to fabricate porous metal oxide with regular shape [6][7][8]. Porous NiO nanospindles have been synthesized by calcining a coordination complex in air and 3 found high specific capacitance [9]. However, the preparation of 3D NiO superstructure derived from MOFs and the application to supercapacitors were scarcely reported.…”

Section: Introductionmentioning

confidence: 98%

“…Nickel oxide (NiO), as one of supercapacitor electrode materials, has been extensively studied due to its high theoretical capacitance, low cost and easy availability [2]. Because the charge-storage mechanism of NiO is based on redox reaction, its capacitive properties greatly depend on morphology and structure [3][4][5]. Recently, metal-organic frameworks have proven to be effective precursors to fabricate porous metal oxide with regular shape [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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MOF-derived porous NiO nanoparticle architecture for high performance supercapacitors

et al. 2017

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Solar‐Light‐Assisted Lithium‐Ion Storage Using Solar‐Light Absorbing Material

et al. 2022

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Wearable devices in several forms, including watches, wristbands, eyewears, and medical devices, are being extensively developed and commercialized. [1][2][3] Since most wearable devices demand lightweight, portable, and high safety, batteries for energy supply also require those properties. Consequently, the importance of developing light, thin, and safe energy storage devices is increasing. Many researchers have attempted to fabricate energy storage systems using various active materials and substrates suitable for wearable devices. Carbon-based fiber or paper substrates and textile substrates have been widely used. [4][5][6][7][8] In addition, the lithium secondary batteries, especially, lithiumsulfur batteries, are currently being developed for wearable device batteries. [9] However, these systems have limited volume capacity and poor cycle performance due to their small quantity of active material in the small and thin batteries. Recently, some studies tried to improve the performance and stability of energy storage systems by introducing gel type of electrolyte or chemical/ physical treatment of active materials. [10,11] However, new materials or additional treatments can cause unexpected problems due to side reactions during the lithiation/delithiation of batteries. Therefore, a way to improve performance and stability without causing any problems is required.The limitations can be overcome by integrating solar energy into the energy storage system, given that wearable devices are easily exposed to sunlight. Many researchers are working on the integration of photovoltaic and energy storage devices (such as batteries and supercapacitors). [12,13] For a previously reported solar-rechargeable battery, a three-electrode system is being developed, where solar energy conversion and storage are performed in different electrodes, [14][15][16] inevitably producing a large-scale system. Furthermore, the reported solarrechargeable battery system does not continuously irradiate light, but only irradiates light during charging. This intermittent light irradiation is not efficient to manage the system and also the effect of light on each lithiation and delithiation was unknown. Therefore, in contrast to the previously reported solar-rechargeable battery concept, this study aimed to improve electrochemical properties and performance by integrating solar energy into the conventional lithium-ion battery, composed of the two-electrode system without increasing the scale of the system. It also compared the effects of continuous and intermittent light irradiation to identify the role of light irradiation in solar light-assisted lithium-ion storage systems. Tungsten oxide (WO 3 ), which can be used as an active material for lithium-ion batteries, can absorb solar light due to its photocatalytic property. [17][18][19][20][21][22] Therefore, the solar light was continuously irradiated onto an electrode and the irradiation effect on lithium-ion storage of WO 3 was evaluated. The photoelectrochromic property of WO 3 allows more el...

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Preparation of mesoporous microspheres of NiO with high surface area and analysis on their pseudocapacitive behavior

Cited by 47 publications

References 33 publications

Improved Electrochemical Phase Diagrams from Theory and Experiment: The Ni–Water System and Its Complex Compounds

Improved Electrochemical Phase Diagrams from Theory and Experiment: The Ni–Water System and Its Complex Compounds

MOF-derived porous NiO nanoparticle architecture for high performance supercapacitors

Solar‐Light‐Assisted Lithium‐Ion Storage Using Solar‐Light Absorbing Material

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