A highly ordered multi-layered hydrogenated TiO<sub>2</sub>-II phase nanowire array negative electrode for 2.4 V aqueous asymmetric supercapacitors with high energy density and long cycle life

Tang, Yongfu; Li, Yanshuai; Guo, Wenfeng; Wang, Jing; Li, Xiaomei; Chen, Shunji; Zhao, Yufeng; Gao, Faming

doi:10.1039/c7ta09590b

Cited by 56 publications

(30 citation statements)

References 55 publications

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“…The maximum specific capacity of 456.2 C g –1 was obtained at 2 mV s –1 . The main possible Faradaic redox mechanism for Fe 3 O 4 @ALD-TiO 2 depends on the following reactions − …”

Section: Results and Discussionmentioning

confidence: 99%

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Kavinkumar

Seenivasan

Sivagurunathan

et al. 2021

ACS Appl. Mater. Interfaces

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The rational design and development of novel electrode materials with promising nanostructures is an effective technique to improve their supercapacitive performance. This work presents high-performance core/shell electrodes based on three-dimensional hierarchical nanostructures coated with conformal thin transition-metal oxide layers using atomic layer deposition (ALD). This effective interface engineering creates disorder in the electronic structure and coordination environment at the interface of the heteronanostructure, which provides many more reaction sites and rapid ion diffusion. At 3 A g–1, the positive CuCo2O4/Ni4Mo/MoO2@ALD-Co3O4 electrode introduced here exhibits a specific capacity of 1029.1 C g–1, and the fabricated negative Fe3O4@ALD-TiO2 electrode significantly outperforms conventional carbon-based electrodes, with a maximum specific capacity of 372.6 C g–1. The supercapattery cell assembled from these two interface- and surface-tailored electrodes exhibits a very high energy density of 110.4 W h kg–1 with exceptional capacity retention over 20,000 cycles, demonstrating the immense potential of ALD for the next generation of supercapacitors.

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“…The maximum specific capacity of 456.2 C g –1 was obtained at 2 mV s –1 . The main possible Faradaic redox mechanism for Fe 3 O 4 @ALD-TiO 2 depends on the following reactions − …”

Section: Results and Discussionmentioning

confidence: 99%

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Kavinkumar

Seenivasan

Sivagurunathan

et al. 2021

ACS Appl. Mater. Interfaces

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“…Upon stopping the illumination, it reflects the decreased electron concentration at the semiconductor surface due to electrons scavenged with the acceptor species in the electrolyte as well as undergoing the recombination with trapped holes. Figure shows the open-circuit voltage–time ( V–t ) spectra of the TNR, 0.05 M Nb 2 O 5 /TNR, 0.5 M Nb 2 O 5 /TNR, and 0.9 M Nb 2 O 5 /TNR films and the decay lifetimes of each V–t profile by fitting to a biexponential function with two time constants calculated using the following equations where τ m is the harmonic mean of the lifetime and the total half-life is log(2 × τ m ).…”

Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation

Arunachalam

Gao

Yun

et al. 2019

ACS Sustainable Chem. Eng.

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Herein, we studied the crucial role of Nb 2 O 5 nanoparticles on hydrothermally grown TiO 2 nanorod (TNR) photoelectrodes for photoelectrochemical reactions utilizing hydrogen and oxygen fuels in water. The synthetic TNR arrays showed a diameter and length of ∼150 nm and 2.4 μm, respectively, whereas the Nb 2 O 5 -coated TNR arrays modulated by the concentration (0.05, 0.5, or 0.9 M) of the Nb 2 O 5 precursor were composed of the widely distributed Nb 2 O 5 nanoparticles through the entire surface area of the TNR. Increasing the concentration of the Nb 2 O 5 precursor enhanced the density of the Nb 2 O 5 nanoparticles coated on TNR arrays. The Nb 2 O 5 (0.05 M)-coated TNR film showed quite a high photocurrent density (J) of ∼1.1 mA/cm 2 at 1.23 V vs RHE (abbreviated as 1.23 V RHE ) compared with ∼0.85 mA/cm 2 of the intrinsic TNR due to efficient charge separation as well as reduction in charge recombination at the interface between the outer surface and the electrolyte. These phenomena were supported by photoluminescence spectra, revealing the rapid decay of the Nb 2 O 5 (0.05 M)-coated TNR photoelectrode offering direct information on the reduction of the charge recombination process. Furthermore, the hydrogen annealing process on the Nb 2 O 5 -coated TNR film shows a rapid increase in J of ∼2.58 mA/cm 2 at 1.23 V RHE , approaching nearly above 1 order of magnitude enhancement compared with the intrinsic Nb 2 O 5 -coated TNR. These results may be attributed to the enhanced donor density preventing the formation of deep trap states and resulting in improved PEC performance. KEYWORDS: Nb 2 O 5 -coated TiO 2 nanorods, Hydrogen treatment, Photoelectrochemical (PEC) water splitting

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“…Hence, aqueous electrolytes are still promising electrolytes for their high conductivity and environmental friendliness. Nonetheless, the operating windows of these aqueous electrolytes are restricted to 1.0 V because of the water decomposition at 1.23 V, , which makes it a challenge to widen working voltage of SCs in aqueous electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Reclaimed Carbon Fiber-Based 2.4 V Aqueous Symmetric Supercapacitors

Zhou

Zhu

Zhao

et al. 2019

ACS Sustainable Chem. Eng.

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Carbon fiber (CF) is a promising material as carbon-based electrode and support for flexible supercapacitors. However, it still suffers from narrow voltage in the aqueous electrolyte due to the water decomposition (1.23 V). Herein, an aerobic pyrolysis is developed to recover aligned carbon fibers from carbon fiber reinforced polymers. More importantly, during this oxygen existence condition, the surface of reclaimed carbon fibers (RCFs) is etched into groove-shaped structure and modified by introducing abundant oxygen-containing functional groups, which significantly expands the negative potential window of RCFsbased electrode to −1.4 V (vs standard calomel electrode) and the working voltage of RCFs-based symmetric supercapacitor to 2.4 V in an aqueous electrolyte of 1.0 M Na 2 SO 4 , with capacitance retention of 90% and 93.6% after 10 000 cycles, respectively. This work well matches the aerobic pyrolysis of recovery of CFs from CFRPs and electrochemical performances of RCFs, supplying a new strategy to develop high-performance energy storage device.

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A highly ordered multi-layered hydrogenated TiO₂-II phase nanowire array negative electrode for 2.4 V aqueous asymmetric supercapacitors with high energy density and long cycle life

Abstract: A highly ordered binderfree multi-layered hydrogenated TiO2-II phase nanowire array (ML-HTO) negative electrode for 2.4 V aqueous asymmetric supercapacitors with high active materials loading, high electrical and ionic conductivity is synthesized via a multi-step method.

Cited by 56 publications

References 55 publications

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation

Reclaimed Carbon Fiber-Based 2.4 V Aqueous Symmetric Supercapacitors

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A highly ordered multi-layered hydrogenated TiO2-II phase nanowire array negative electrode for 2.4 V aqueous asymmetric supercapacitors with high energy density and long cycle life

Abstract: A highly ordered binderfree multi-layered hydrogenated TiO2-II phase nanowire array (ML-HTO) negative electrode for 2.4 V aqueous asymmetric supercapacitors with high active materials loading, high electrical and ionic conductivity is synthesized via a multi-step method.

Cited by 56 publications

References 55 publications

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO2 and Co3O4 Thin Films for High-Performance Supercapattery Devices

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO2 and Co3O4 Thin Films for High-Performance Supercapattery Devices

Effects of Hydrogen Treatment and Nb2O5 Nanoparticle Decoration in TiO2Nanorods for Solar Water Oxidation

Reclaimed Carbon Fiber-Based 2.4 V Aqueous Symmetric Supercapacitors

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A highly ordered multi-layered hydrogenated TiO₂-II phase nanowire array negative electrode for 2.4 V aqueous asymmetric supercapacitors with high energy density and long cycle life

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Three-Dimensional Hierarchical Core/shell Electrodes Using Highly Conformal TiO₂ and Co₃O₄ Thin Films for High-Performance Supercapattery Devices

Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation