The storage mechanism difference between amorphous and anatase as supercapacitors

Zhang, Wanggang; Liu, Yiming; Song, Zhiyuan; Zhuang, Changwan; Wei, Aili

doi:10.1016/j.gee.2020.10.004

Cited by 6 publications

(6 citation statements)

References 41 publications

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“…Figure 7a presents a characteristic CV profile obtained at a scan rate of 0.5 mV s −1 within a voltage range of 1.0−2.5 V. The CV profile shows a quasirectangular shape indicative of pseudocapacitive behavior, commonly observed in amorphous and nanostructured materials. 31,42,43 Additionally, two broad redox peaks at 2.1 and 1.7 V suggest the involvement of an intercalative storage mechanism. 44 The presence of redox peaks in Li-brookite closely resembles the intercalation voltages observed in anatase.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…This similarity likely arises from the similar octahedral coordination arrangement of intercalated lithium ions in both materials. , Therefore, the overall charge storage mechanism in Li-brookite is a combination of reversible redox faradic charge transfer occurring on the surface of the nanostructured electrode and diffusion-limited intercalative charge storage achieved through the insertion and extraction of lithium ions from the crystal lattice. The surface redox mechanism can be attributed to the substantial surface area of the nanostructured electrode and the presence of amorphous regions. ,, On the other hand, faradic intercalation charge storage is mainly facilitated by the crystalline counterpart of the electrode material. This integrated approach, termed intercalation pseudocapacitance, merges the advantages of both capacitors and batteries.…”

Section: Resultsmentioning

confidence: 99%

“…The surface redox mechanism can be attributed to the substantial surface area of the nanostructured electrode and the presence of amorphous regions. 31,42,43 On the other hand, faradic intercalation charge storage is mainly facilitated by the crystalline counterpart of the electrode material. This integrated approach, termed intercalation pseudocapacitance, merges the advantages of both capacitors and batteries.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This could potentially be attributed to lattice distortion induced by the incorporation of Li. We hypothesized that the presence of crystalline domains would facilitate faradic charge storage through ion intercalation sites, while nanostructured and amorphous regions are proposed to enhance the pseudocapacitive mechanism by offering an increased number of lithiation sites, shorter diffusion paths for ions, and a broader framework for ion movement. − …”

Section: Resultsmentioning

confidence: 99%

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Impact of Lithium Incorporation on the Structure and Electrochemical Performance of Brookite Anode

Jena,

Lim,

et al. 2024

Energy Fuels

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This study presents the synthesis, characterization, and electrochemical performance of nanostructured Li-brookite, a promising anode material for lithium-ion batteries. Nanostructured Li-brookite heterostructures, combining amorphous and crystalline characteristics, were successfully synthesized via a two-step chemical lithiation-calcination method. The distorted orthorhombic structure of Li-brookite, influenced by Li doping, was observed. Morphological examination reveals intricate flowerlike and nanoneedle-shaped particles. Nanostructuring enhances the active surface area and provides a short ion-diffusion path, while the amorphous−crystalline−amorphous architecture establishes an open framework and accelerates lithiation kinetics. These features collectively enhance electrochemical performance, primarily through intercalation pseudocapacitance, demonstrating rapid charge transfer and high energy density. Notably, Li-brookite exhibits impressive initial specific capacity, robust high-rate performance at various current rates, and excellent cycling stability and Coulombic efficiency. These findings underscore the potential of Li-brookite as a promising anode material in advanced LIB applications.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Impact of Lithium Incorporation on the Structure and Electrochemical Performance of Brookite Anode

Jena,

Lim,

et al. 2024

Energy Fuels

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“…Figure 4 shows the nitrogen adsorption-desorption isotherms of the prepared TiO 2 samples, and the results derived from these isotherms are reported in Table 2 . All the prepared TiO 2 photocatalysts showed the type IV isotherm characteristic with an H3-type loop according to the IUPAC classification, indicating the irregular structure of the inner surface of the pores ( Sing et al, 1985 ; Yurdakal et al, 2019 ; Zhang et al, 2022 ). The samples prepared without thermal treatment showed values of specific surface area in the range ca.…”

Section: Resultsmentioning

confidence: 99%

Selective Photocatalytic Oxidation of Glycerol and 3-Pyridinemethanol by Nanotube/Nanowire-Structured TiO2 Powders Obtained by Breakdown Anodization

et al. 2022

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Nanotube/nanowire-structured TiO2 was formed on the Ti surface by an anodic oxidation method performed at different potential values (50 or 60 V) and for different times (3 or 5 h). The TiO2 photocatalysts were taken in powder form using the ultrasonic treatment from the Ti electrodes, calcined at different temperatures, and characterized by XRD and SEM techniques, and BET surface area analyses. Both the crystallinity and the size of the primary TiO2 particles increased by increasing the heat treatment temperature. While all the photocatalysts heat treated up to 500°C were only in the anatase phase, the particles heat-treated at 700°C consisted of both anatase and rutile phases. The BET specific surface area of the samples decreased drastically after heat treatment of 700°C because of partial sinterization. SEM analyses indicated that the prepared materials were structured in both nanotubes and nanowires. They were tested as photocatalysts for the selective oxidation of glycerol and 3-pyridinemethanol under UVA irradiation in water at room temperature and ambient pressure. Glyceraldehyde, 1,3-dihydroxyacetone, and formic acid were determined as products in glycerol oxidation, while the products of 3-pyridinemethanol oxidation were 3-pyridinemethanal and vitamin B3. Non-nanotube/nanowire-structured commercial (Degussa P25 and Merck TiO2) photocatalysts were used for the sake of comparison. Low selectivity values towards the products obtained by partial oxidation were determined for glycerol. On the contrary, higher selectivity values towards the products were obtained (total 3-pyridinemethanal and vitamin B3 selectivity up to ca. 90%) for the photocatalytic oxidation of 3-pyridinemethanol. TiO2 photocatalysts must be highly crystalline (calcined at 700°C) for effective oxidation of glycerol, while for the selective oxidation of 3-pyridinemethanol it was not necessary to obtain a high crystallinity, and the optimal heat treatment temperature was 250°C. Glycerol and its oxidation products could more easily desorb from highly crystalline and less hydroxylated surfaces, which would justifies their higher activity. The prepared photocatalysts showed lower activity than Degussa P25, but a greater selectivity towards the products found.

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Electrochemical behavior of cerium (III) hydroxide thin-film electrode in aqueous and non-aqueous electrolyte for supercapacitor applications

Sonar

Sanjeevagol

Manjanna

et al. 2022

J Mater Sci: Mater Electron

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The storage mechanism difference between amorphous and anatase as supercapacitors

Cited by 6 publications

References 41 publications

Impact of Lithium Incorporation on the Structure and Electrochemical Performance of Brookite Anode

Impact of Lithium Incorporation on the Structure and Electrochemical Performance of Brookite Anode

Selective Photocatalytic Oxidation of Glycerol and 3-Pyridinemethanol by Nanotube/Nanowire-Structured TiO2 Powders Obtained by Breakdown Anodization

Electrochemical behavior of cerium (III) hydroxide thin-film electrode in aqueous and non-aqueous electrolyte for supercapacitor applications

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