JOURNAL OF CRYSTAL GROWTH
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2020
·
IF 1.632
Shutong Yuan,Bo Li,Jin Wang
Morphology control is a challenging subject in preparing monocrystalline 1D perovskite structures due to high symmetry of their crystal structure. Herein, we employed K 2 Ti 6 O 13 as the precursor and demonstrated its effectiveness in synthesizing the PX-PbTiO 3 nanowires, which could be transformed into monocrystalline perovskite-type PbTiO 3 nanowires by facile heat treatment in air. We studied the impact of hydrothermal reaction parameters such as temperature, reaction duration and surfactant concentration on the phase and morphology of the products. It was shown that the employment of a proper concentration of PVA was necessary to the formation of high-quality PX-PT nanowires. Based on the results of control experiments, a possible mechanism for the formation of PX-PT nanowires was proposed.
研究领域:
材料科学
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纳米技术
·
化学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chengshuang Zhang,Chuanshen Wang,Dazhi Zhang,Shuge Dai,Yi Xi,Weina Xu,Jie Chen,Nana Bai,Yalian Yang
The K 2 Ti 6 O 13 nanobeams (K-TNBs) with tunnel structure have been prepared by simple hydrothermal method . To attain the flexible property and the high cycle stability, the carbon absorbed on K-TNBs (C@K-TNBs) supercapacitor (SC) has been encapsulated by the flexible PDMS (polydimethylsiloxane). The solid SC device shows excellent rate capability, high cycle stability and high flexibility at any degrees. The capacitance of the device can attain 301 F g −1 at current of 3 mA, energy density of 26.8 Wh kg −1 at power density 400 W kg −1 and power density of 1.47 kW kg −1 at energy density 16.3 Wh kg −1 . The retention of specific capacitance remains 82.7% after 10000 cycles at high current value of 21 mA. Three supercapacitors in series can light 100 green color commercial light emitting diodes (LEDs) for about 16 minutes. All these results indicate that the C@K-TNBs nanomaterial could provide the potential application in high performance supercapacitor .
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dongyang Li,Cai Liu,Dajian Huang,Miaoxin Zhang,Xin Zhang,Huiyang Gou,Fuxing Yin,Gongkai Wang
Potassium ion capacitors (PICs) represent a promising energy storage device with high energy and power densities for long stretches beyond the lithium and sodium storage chemistry of nowadays. As an analogous anode like lithium titanates, potassium titanates (KTO) are expected to be applied to PICs. Herein, hydrated KTO (K 2 Ti 6 O 13 ) nanobelts were regulated on graphene nanosheets by a method of atomic layer deposition (ALD) coupled with hydrothermal potassiation. The close correlation of KTO to the underneath graphene nanosheets favors the electron transport, the interweaved structure facilitates the permeation of electrolyte ions, and the chemically (interlayer) adsorbed water endows KTO with larger interlayer spacing, synergistically giving rise to an accelerated solid solution potassiation mechanism. Based upon this, superior specific capacity and rate capability (87 mAh g −1 @1 A g −1 ), as well as stability of the ALD KTO can be delivered, outperforming many performances of reported KTO anodes. The PICs exhibit simultaneously high energy/power densities (Max. 119.3 Wh kg −1 @117.5 W kg −1 , 4.7 kW kg −1 @35.3 Wh kg −1 ) as well as good capacity retention after 4,000 cycles. Our work demonstrates the great performance of ALD KTO anode and the promising application of PICs, which propose a delicate methodology of high performance K + storage anode materials.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4064-4078
·
IF 5.773
Qiang Wang,Shiyou Guan,Bing Li
Two-dimensional (2D) graphitic-C3N4 (g-C3N4) was successfully hybridized with one-dimensional (1D) flux-grown Na-modified K2Ti6O13 nanobelts (Na-K2Ti6O13 NBs) for the first time to construct novel 1D/2D Na-K2Ti6O13/g-C3N4 heterostructured photocatalysts using a facile mixing–calcination method. The heterostructured Na-K2Ti6O13/g-C3N4 composites with three-dimensional (3D) hybrid architectures exhibited a remarkably enhanced photocatalytic efficiency for organic pollutant degradation in comparison with pure Na-K2Ti6O13 and g-C3N4 under both simulated sunlight and visible-light irradiation (λ > 420 nm), which could be mainly attributed to the synergistic effects between Na-K2Ti6O13 and g-C3N4 including more efficient interfacial charge transfer, longer lifetimes and the stronger oxidation and reduction ability of photogenerated charge carriers, fundamentally originating from the formation of Na-K2Ti6O13/g-C3N4 heterojunctions based on the well-matched energy-band structures. Moreover, the Na-K2Ti6O13/g-C3N4 hybrids showed good stability and reusability for the photocatalytic degradation of organic pollutants. Finally, the possible mechanisms responsible for the improved simulated sunlight and visible-light photocatalytic performance were also investigated, respectively, based on the results of PL spectra, time-resolved fluorescence decay spectra, radical species trapping experiments, ESR spectra and PL-TA measurements. Overall, this work will not only be beneficial for the design and development of more efficient visible-light-responsive g-C3N4-based composites for solar energy conversion and environmental remediation but will also be influential in optimizing the visible-light photocatalytic activity of wide-band-gap 1D titanate nanomaterials to meet the requirements of practical applications.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2024
·
IF 1.8
Zhi Li,Yuhan Jing,Qianxu Ye,Jie Wang,Nan Sun,Liexing Zhou,Jinming Cai
In this study, K 2 Ti 6 O 1 3 (KTO) nanowires were doped with carbon (CKTO) via a novel solid-phase approach at 800 ∘ C for the first time using ethanol, KF, and TiO 2 . In addition to the lower sintering temperature, a shorter insulation period was achieved compared to the conventional solid-phase method. Furthermore, by combining and calcining CKTO and g-C 3 N 4 , a CKTO/g-C 3 N 4 heterojunction composite was produced. The rate at which CKTO/g-C 3 N 4 photocatalytically degraded methylene blue was higher than those of pure CKTO and g-C 3 N 4 . Our study indicates that adding g-C 3 N 4 enhances photocatalytic performance by reducing the recombination rate of photogenerated electron–hole pairs and narrowing the bandgap of the CKTO/g-C 3 N 4 heterostructure. This paper presents a novel method for creating KTO composites in an eco-friendly and productive manner for the photocatalytic degradation of organic colors.
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 10
·2007
·
IF 3.7
Xixi Cao,Xueying Zhang,Jiangtao Li,Jiachen Liu
Mullite fiber materials are widely used in high-temperature thermal insulation applications, especially in aerospace thermal protection systems, due to their excellent thermal stability and low thermal conductivity. However, the material exhibits poor resistance to infrared radiative heat transfer at elevated temperatures. Accordingly, a dual-opacifier system composed of TiO 2 and K 2 Ti 6 O 13 binary whiskers was proposed as an effective strategy for enhancing thermal insulation performance. MF/TiO 2w and MF/TiO 2w /K 2 Ti 6 O 13w were fabricated in this study using a sol–gel method combined with in situ whisker growth. The results show that upright and interlaced K 2 Ti 6 O 13 and TiO 2 whiskers were uniformly grown on the fiber surface, contributing to a high infrared reflectance of 97.7% in the wavelength range of 2.5–10 μm. Under a front-side temperature of 1000 °C, the modified mullite fiber-based material exhibits a backside temperature of 177.8 °C, corresponding to a reduction of 71.8 °C compared with the original sample (249.6 °C), demonstrating significantly enhanced thermal insulation performance. In addition, the composite exhibits an ultralow density of less than 0.20 g/cm 3 . The as-prepared thermal insulation material shows a high rebound rate of 76.5% at a strain of 30%, indicating good elasticity. The results demonstrate that the developed composite exhibits excellent infrared shielding and structural stability, confirming that the binary whisker strategy effectively enhances the thermal insulation performance of the mullite fiber-based materials, highlighting its potential for high-temperature aerospace applications.
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DOI
PubMed
高影响因子
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