ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoqi Mao,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu,Huanzhi Zhang,Jian Zhang,Cuili Xiang
The three-dimensional (3D) architecture of electrode materials with excellent stability and electrochemical activity is extremely desirable for high-performance supercapacitors. In this study, we develop a facile method for fabricating 3D self-supporting Ti3C2 with MoS2 and Cu2O nanocrystal composites for supercapacitor applications. MoS2 was incorporated in Ti3C2 using a hydrothermal method, and Cu2O was embedded in two-dimensional nanosheets by in situ chemical reduction. The resulting composite electrode showed a synergistic effect between the components. Ti3C2 served as a conductive additive to connect MoS2 nanosheets and facilitate charge transfer. MoS2 acted as an active spacer to increase the interlayer space of Ti3C2 and protect Ti3C2 from oxidation. Cu2O effectively prevented the collapse of the lamellar structure of Ti3C2–MoS2. Consequently, the optimized composite exhibited an excellent specific capacitance of 1459 F g–1 at a current density of 1 A g–1. Further, by assembling an all-solid-state flexible supercapacitor with activated carbon, a high energy density of 60.5 W h kg–1 was achieved at a power density of 103 W kg–1. Additionally, the supercapacitor exhibited a capacitance retention of 90% during 3000 charging–discharging cycles. Moreover, high mechanical robustness was retained after bending at different angles, thereby suggesting significant potential applications for future flexible and wearable devices.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
Electronic Materials Letters
·
2022
·Vol. 18
·期 6
·519-531
·
IF 3.151
Li Ce,Gu Shaoqiang,Ma Tao,Li Dongchan
Alternative current electroluminescent device with excellent air permeability were fabricated by a facile electrospinning method, and the optimal fabrication conditions of the device substrate and light-emitting layer, such as voltage, acceptance distance, concentration, and propulsion rate, were determined. The microscopic morphology, luminance and air permeability of the samples were explored and analyzed. The characterization results show that the flexible alternative current electroluminescent device fabricated by electrospinning method exhibits excellent mechanical properties and high air permeability. The device can reach 55.74 cd/m 2 at a voltage of 130 V and a frequency of 3 kHz, and the air permeability can reach 5.81 g/(h·m 2 ). It is discussed that its excellent breathability is attributed to the overall microns fabric structure. On the basis of these results, we believe our electrospinningac process will accelerate development of more comfortable electroluminescent devices with the flexibility required for real-world applications. Graphical abstract
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4238
·
IF 5.719
Wenhang Wu,Zheng Liang,Meng Jia,Yuwei Li,Xiongcong Guan,Yunfeng Zhan,Jinxiu Wen,Jianyi Luo
A flexible thermoelectric device has been considered as a competitive candidate for powering wearable electronics. Here, we fabricated an n-type Ag2Se/Ag composite film on a flexible nylon substrate using vacuum-assisted filtration and a combination of cold and hot pressing. By optimising the Ag/Se ratio and the sequential addition and reaction time of AA, an excellent power factor of 2277.3 μW∙m−1K−2(corresponding to aZTof ~0.71) at room temperature was achieved. In addition, the Ag2Se/Ag composite film exhibits remarkable flexibility, with only 4% loss and 10% loss in electrical conductivity after being bent around a rod of 4 mm radius for 1000 cycles and 2000 cycles, respectively. A seven-leg flexible thermoelectric device assembled with the optimised film demonstrates a voltage of 19 mV and a maximum power output of 3.48 μW (corresponding power density of 35.5 W m−2) at a temperature difference of 30 K. This study provides a potential path to design improved flexible TE devices.Keywords:thermoelectricity;Ag2Se;Ag;composite film;flexible device
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 40
·14155-14163
·
IF 7.059
Haibo Ye,Bo Sun,Ziyi Wang,Zhiyong Liu,Xuning Zhang,Xianhua Tan,Tielin Shi,Zirong Tang,Guanglan Liao
Organic–inorganic halide perovskite materials exhibit excellent memristive properties, such as high ON/OFF ratio and low switching voltage. However, the toxicity of lead and poor stability strictly limit their further commercial applications. Herein, a high-quality nontoxic and stable AgBiI4 perovskite film is successfully synthesized via a low-temperature dynamic hot casting method, and resistive switching (RS) memory devices based on AgBiI4 are reported for the first time. The RS memory devices with the ITO substrate exhibit typical bipolar nonvolatile memory behaviors with an ultralow operating voltage (≈0.16 V), high ON/OFF ratio (≈104), reversible RS by pulse voltage operation (>700) and long data retention (>104 s), superior to those of most of the other perovskite-based memory devices. Furthermore, a high performance flexible nonvolatile resistive switching (RS) memory device based on a AgBiI4 perovskite with a PEN substrate is fabricated. The flexible device also displays good stability under repeated bending tests (>1000 cycles). By analyzing the current–voltage responses, and the transmission electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy results, we propose a mechanism involving conducting filaments formed by Ag cations to describe the RS behavior of the Ag/PMMA/AgBiI4/ITO device. Our work demonstrates that AgBiI4 is promising for nonvolatile memory devices and paves the way for realizing low-power consumption flexible nonvolatile memory devices.
研究领域:
材料科学
·
电子工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yushan Xu,Xinrun Yu,Xiaodong Wang,Juan Yu,Pei Huang
Polymer-derived nitrogen-doped porous carbon networks display stable electrochemical properties and have been extensively studied as electrode materials. However, the precise control of pore morphology and size distribution remains challenging. Herein, the pore structure of polyimide membranes was initially established by controlling the coating thickness. Subsequent to carbonization, the pore morphology and surface area were further controlled. The resulting optimized porous carbon exhibits a uniform pore distribution, a large specific surface area, and appropriate heteroatom content. In a three-electrode system, it achieves a specific capacitance of 328.4 F g −1 at 0.5 A g −1 . Additionally, the symmetric supercapacitor delivers an impressive energy density of 20.3 Wh kg −1 at 350 W kg −1 in a 6 M KOH electrolyte, retaining 88.5 % of its specific capacity after 5000 cycles. Notably, the specific capacitance of a flexible solid-state device is 151.6 mF cm −2 at 2 mA cm −2 . This work introduces a simple, environmentally friendly approach for producing porous carbon from polyimide with adjustable morphology.
研究领域:
材料科学
·
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 8
·2141-2146
·
IF 6
Chuqiao Hu,La Li,Guozhen Shen
Main observation and conclusion Ti 3 C 2 MXene serving as superior electrical conductors presents more specific performance such as transparency, conductivity than gold (Au), and even could form a heterostructure with active materials of the functional devices. Here, a Ti 3 C 2 MXene-Te microplate van der Waals heterostructure based transparent near-infrared photodetector (PD) is exploited. Compared with Au-Te PD, the on-off ratio of the Ti 3 C 2 -Te PD is improved by seven orders of magnitude and reaches 9.51 × 10 7 under 1064 nm laser illuminations. Benefiting from the utilization of flexible PET substrate and Ti 3 C 2 conductors in manufacturing PD devices, the Ti 3 C 2 -Te PD exhibits excellent flexibility with no noticeable response change after being bent for different states and times. Moreover, 63% transmittance of the fabricated PD devices over the 500—1000 nm wavelength range is obtained. All the above results demonstrate the tremendous potential in wearable optoelectronics.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ruiyang Yu,Hui Qiao,Gengcheng Liao,Zongyu Huang,Qiaoliang Bao,Xiang Qi
Here, a photoelectrochemical (PEC) photodetector with good flexibility and high photoresponsivity was successfully fabricated in a vertical structure, where the MXene (Ti2CTx) nanosheet and carbon black electrode were separated by adenosine triphosphate/nicotinamide adenine dinucleotide phosphate (ATP/NADPH)-incorporated solid-state electrolyte. The photocurrent and photoresponsivity can reach 1.84 μA/cm2 and 8.89 μA/W, respectively, under a light intensity of 90 mW/cm2 at a bias potential of 0.6 V, which are approximately 2.3 times those of Ti2CTx nanosheets. The addition of ATP and NADPH to the electrolyte also leads to a large decrease of the rise time from 0.76 to 0.26 s. Furthermore, the photodetector can continue to function and maintain stability under 45° bending and after 500 cycles of bending, indicating a robust device structure and great flexibility. The performance enhancement of the PEC photodetector can be attributed to the synergistic effect of electrolyte additives on Ti2CTx nanosheets, where ATP and NADPH greatly enhance the circulation and utilization of photogenerated carriers. This work suggests that the incorporation of chloroplast-inspired carrier circulation with two-dimensional nanosheets could achieve efficient light-current conversion, providing a new strategy to improve the performance of PEC-type photodetectors.
研究领域:
材料科学
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光电器件
·
生物启发设计
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yongfeng Wang,Changlei Ge,Mingxu Wang,Jun Ma,Yuchen Zhou,Shuqi Wang,Mengyuan Liu,Qiang Gao,Feijun Zhao,Qingqing Cheng,Feng Wen,Yujie Liu,Hao Shen,Lianhui Li,Ting Zhang
The evaporation-induced hydrovoltaic effect represents a promising avenue for green energy harvesting and self-powered ion sensing. However, the intricacies of designing the solid-liquid interface and the insufficient systematic research on the influence of interface parameters on hydrovoltaic performance hinder the advancement of high-performance hydrovoltaic devices. Herein, the governing principles of nanochannel size, material conductivity, surface properties, and water evaporation on the hydrovoltaic effect based on the multidimensional regulation of nanochannels by dip-coating and carbonization processes are systematically elucidated. Guided by the obtained influence mechanisms, a high-performance flexible hydrovoltaic sensing device with photothermal conversion capability is prepared, exhibiting an open-circuit voltage exceeding 3.5 V and a wide univalent ion sensing range of 10 −7 –10 −1 m . Ultimately, the fabricated flexible hydrovoltaic device successfully serves for self-powered electrolyte monitoring. These results systematically elucidate the correlation between the controllable design of solid–liquid interfaces (on structure, material conductivity, surface properties, and environmental factors) and high-performance hydrovoltaic devices, paving the way for practical applications.
研究领域:
材料科学
·
能源技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yongqi Yang,Lin Guan,Guanghui Gao
Traditional optoelectronic devices without stretchable performance could be limited for substrates with irregular shape. Therefore, it is urgent to explore a new generation of flexible, stretchable, and low-cost intelligent vehicles as visual display and storage devices, such as hydrogels. In the investigation, a novel photochromic hydrogel was developed by introducing the negatively charged ammonium molybdate as a photochromic unit into polyacrylamide via ionic and covalent cross-linking. The hydrogel exhibited excellent properties of low cost, easy preparation, stretchable deformation, fatigue resistance, high transparency, and second-order response to external signals. Moreover, the photochromic and fading process of hydrogels could be precisely controlled and repeated under the irradiation of UV light and exposure of oxygen at different time and temperature. The photochromic hydrogel could be considered applied for artificial intelligence system, wearable healthcare device, and flexible memory device. Therefore, the strategy for designing a soft photochromic material would open a new direction to manufacture flexible and stretchable devices.
研究领域:
材料科学
·
生物医学工程
·
智能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Lili He,Rui Liu,Chunhua Ge,Chunxue Ma,Li Yang,Xiangdong Zhang
Recently, carbon dots (CDs) have gained much attention in optoelectronic fields on account of their superior optical and environmentally friendly properties. Nevertheless, aggregation-induced quenching (AIQ) effect of solid-state CDs and thermal quenching caused by high temperatures severely hinders their further development. Herein, a novel wCDs/BNNS-OH hybrid nanostructure was synthesized by combining blue CDs (bCDs) and yellow CDs (yCDs) to the hydroxylated boron nitride nanosheets (BNNS–OH) surface. The uniform dispersion of CDs in BNNS-OH effectively alleviates the undesirable AIQ effect, and enables CDs/BNNS-OH composites to have color-tunable fluorescence characteristics. The wCDs/BNNS-OH/PVA composite film was obtained by encapsulating wCDs/BNNS-OH into polyvinyl alcohol (PVA). The film exhibits excellent luminescence stability in the air, ultraviolet light , water, and high-temperature environment. Meanwhile, since wCDs/BNNS-OH establishes an effective heat transfer channel in the PVA matrix, the working temperature of CDs in the wCDs/BNNS-OH/PVA film is greatly reduced. Moreover, the prepared wCDs/BNNS-OH/PVA film is flexible enough to retain the photoluminescence intensity unchanged after thousands of bending cycles. This high stability and heat dissipation wCDs/BNNS-OH/PVA composite film will facilitate the application of CDs in flexible and foldable lighting devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 84
·53219-53225
·
IF 3.108
Jiayue Wen,Yanhong Tian,Zhipeng Mei,Weizhen Wu,Yanqing Tian
Herein, we report an innovative application of doping conjugated-polypyrrole nanoparticles (PPy NPs) into electrically conductive adhesives (ECAs) to prepare low-electrical resistivity interconnecting materials. PPy NPs were synthesized via a facile one-step chemical oxidative polymerization method at room temperature with the average diameter as small as 86.8 nm. Particles' diameters and dispersity were manipulated under different polymerization conditions through the adjustment of weight percentages and molecular weights of polyvinylpyrrolidone (PVP) as the surfactants. Results showed that higher concentrations of PVP and the longer chains of PVPs resulted in smaller diameters of PPy NPs. We also found that a suitable portion of ethanol in the polymerization mixtures gives rise to a better dispersity than that observed in mixtures without ethanol. When a small amount of PPy NPs was added into traditional epoxy resin-based and silver-flakes-filled ECAs, the resistance measurements showed an enhancement in the electrical conductivity, or in other words, a reduction in resistivity significantly. For example, the electrical resistivity of 70 wt% silver-filled ECAs was reduced from 1.6 × 10−3 Ω cm to 9.4 × 10−5 Ω cm by using only 2.5 wt% PPy NPs as the dopants. Thus, our results confirmed new applications of PPy NPs in the field of ECAs for decreasing the resistance, reducing the dosage of silver in ECAs, and achieving flexible devices. Finally, flexible electrical patterns were printed on paper and polyimide substrates were used as conducting circuits to light LED devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Jun Han,Changchun Fan,Dian-sen Li,Lei Jiang
The application of conductive polymer hydrogels in flexible energy storage devices has gained a great deal of attention. In this paper, the hydrogel integrating water retention and antifreeze properties is realized by the organic binding of polyvinyl alcohol (PVA) chains and NaClO 4 . The composite hydrogel is assembled with MnO 2 /carbon fiber and activated carbon fiber to constitute a flexible quasi-solid-state supercapacitor. The capacitor can cycle 25,000 times with the capacitance retention of 81 % when exposed directly to the external environment. In addition, the capacitor can store charge consistently and stably between −40 °C and 40 °C. This demonstrates the excellent environmental stability of the composite gel, which ensures stable operation of the device under extreme conditions. Excitingly, the mechanics of PVA composite gel electrolyte can be dynamically coordinated using the Hofmeister effect. The longer the flexible quasi-solid supercapacitor is soaked in 1.5 M Na 2 SO 4 solution, the stronger the mechanical properties are. There are new thoughts in engineering new flexible supercapacitors with this biological compatibility and multi-functional conductive hydrogel.
研究领域:
材料科学
·
能源存储
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）