Spaced TiO<sub>2</sub> nanotube arrays allow for a high performance hierarchical supercapacitor structure

Nguyen, Nhat Truong; Özkan, Selda; Hwang, Imgon; Zhou, Xuemei; Schmuki, Patrik

doi:10.1039/c6ta10179h

Cited by 62 publications

(36 citation statements)

References 56 publications

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“…[25] The crystalline size is roughlyt he average wall thickness of the [28] Note that the Ti n + 2p 3/2 /Ti n + 2p 1/2 ratio (n = 2, 3 and 4) is fixed at 2. [25] The crystalline size is roughlyt he average wall thickness of the [28] Note that the Ti n + 2p 3/2 /Ti n + 2p 1/2 ratio (n = 2, 3 and 4) is fixed at 2.…”

Section: Growth Mechanismmentioning

confidence: 99%

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

et al. 2019

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Supercapacitors store charge by ion adsorption or fast redox reactions on the surface of porous materials. One of the bottlenecks in this field is the development of biocompatible and high‐rate supercapacitor devices by scalable fabrication processes. Herein, a Ti‐rich anatase TiO2 material that addresses the above‐mentioned challenges is reported. Tubular nanolettuces were fabricated by a cost‐effective and fast anodization process of Ti foil. They attained a large potential window of 2.5 V in a neutral electrolyte owing to the high activation energy for water splitting of the (1 0 1) facet. Aqueous and all‐solid‐state devices showed diffusion time constants of 46 and 1700 ms, as well as high maximum energy (power) densities of 0.844 (0.858) and 0.338 μWh cm−2 (0.925 mW cm−2), respectively. The all‐solid‐state device showed ultrahigh stability of 96 % in capacitance retention after 20 000 galvanostatic charge/discharge cycles. These results open an avenue to fabricate biochemically inert supercapacitor devices.

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Section: Growth Mechanismmentioning

confidence: 99%

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

et al. 2019

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“…The individual NTs have a length of 3 μm and a diameter of 170 nm. It is apparent that each NT is separated from the others, leaving a space of approximately 200 nm between individual tubes . This distance is used to decorate the individual NT walls with TiO 2 NPs by using a TiCl 4 hydrolysis approach .…”

Section: Figurementioning

confidence: 99%

“…This distance is used to decorate the individual NT walls with TiO 2 NPs by using a TiCl 4 hydrolysis approach . In fact, the inter‐tube spacing is sufficiently large that the TiCl 4 treatment can be repeated several times to decorate the NT walls in a layer‐by‐layer approach, thereby maximizing the specific surface area . Figures d and 1 e show SEM images of spaced TiO 2 NTs after eight layers of decoration.…”

Section: Figurementioning

confidence: 99%

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Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

et al. 2018

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Regularly spaced TiO2 nanotubes were prepared by anodizing a titanium substrate in triethylene glycol electrolyte at elevated temperature. In comparison to conventional TiO2 nanotubes, spaced nanotubes possess an adjustable spacing between the individual nanotubes; this allows for controlled buildup of a hierarchical nanoparticle‐on‐nanotube structure. Here, we use this principle for layer‐by‐layer decoration of the tubes with TiO2 nanoparticles. The hierarchical structure after N doping and NH3 treatment at 450 °C shows a significant enhancement of visible‐light absorption, although it only carries a low doping concentration of nitrogen. For optimized N‐doped and particle‐decorated spaced TiO2 nanotubes, a considerable improvement in photocatalytic activity is obtained in comparison with conventional N‐doped TiO2 nanotubes or comparable N‐doped nanoparticle films. This is attributed to an enhanced visible‐light absorption through the N‐doped nanoparticle shell and a fast charge separation between the shell and the one‐dimensional nanotubular core.

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“…In addition, the specific colloid electrode structure favors the fast redox reaction of cations. In traditional electrode system, nanomaterials with short ion diffusion path are often used in various energy storage system, which can increase the number of active sites and redox rate . However, colloids electrode with the colloids distributed in carbon/binder matrix, can form fast transfer network of ions/electrons, facilitating the redox reactions and improving the involved electrochemical performances.…”

Section: Redox Cations In Colloidal Electrodementioning

confidence: 99%

Colloidal Supercapattery: Redox Ions in Electrode and Electrolyte

Chen

Xue

2017

The Chemical Record

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Redox chemistry is the cornerstone of various electrochemical energy conversion and storage systems, associated with ion diffusion process. To actualize both high energy and power density in energy storage devices, both multiple electron transfer reaction and fast ion diffusion occurred in one electrode material are prerequisite. The existence forms of redox ions can lead to different electrochemical thermodynamic and kinetic properties. Here, we introduce novel colloid system, which includes multiple varying ion forms, multi-interaction and abundant redox active sites. Unlike redox cations in solution and crystal materials, colloid system has specific reactivity-structure relationship. In the colloidal ionic electrode, the occurrence of multiple-electron redox reactions and fast ion diffusion leaded to ultrahigh specific capacitance and fast charge rate. The colloidal ionic supercapattery coupled with redox electrolyte provides a new potential technique for the comprehensive use of redox ions including cations and anions in electrode and electrolyte and a guiding design for the development of next-generation high performance energy storage devices.

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Spaced TiO₂ nanotube arrays allow for a high performance hierarchical supercapacitor structure

Abstract: Establishing self-organized spacing between TiO2 nanotubes allows for highly conformal wall decoration – allowing for spatially defined hierarchical structures that can be adjusted to an optimized electrochemical performance.

Cited by 62 publications

References 56 publications

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Colloidal Supercapattery: Redox Ions in Electrode and Electrolyte

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Spaced TiO2 nanotube arrays allow for a high performance hierarchical supercapacitor structure

Abstract: Establishing self-organized spacing between TiO2 nanotubes allows for highly conformal wall decoration – allowing for spatially defined hierarchical structures that can be adjusted to an optimized electrochemical performance.

Cited by 62 publications

References 56 publications

Ti‐rich TiO2 Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

Ti‐rich TiO2 Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

Spaced Titania Nanotube Arrays Allow the Construction of an Efficient N‐Doped Hierarchical Structure for Visible‐Light Harvesting

Colloidal Supercapattery: Redox Ions in Electrode and Electrolyte

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Product

Resources

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Spaced TiO₂ nanotube arrays allow for a high performance hierarchical supercapacitor structure

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices

Ti‐rich TiO₂ Tubular Nanolettuces by Electrochemical Anodization for All‐Solid‐State High‐Rate Supercapacitor Devices