Materials
·
2024
·Vol. 17
·期 9
·2144
·
IF 3.1
Haiwei Hu,Yanyan Guo,Jiang Zhao
Flexible electronic products, with their characteristics of flexibility and wearability, have attracted significant attention and have become an important direction in the research and development of the electronics industry. Planar micro-supercapacitors (MSCs) with flexible composite electrodes can provide reliable energy support for these products, propelling their further development. The research employed a quick, effective, and environmentally friendly method of laser scribing to create shape-controllable flexible composite electrodes on composite films of Poly(3,4-ethylenedioxythiophene) and graphene oxide (PEDOT/GO), which were subsequently assembled into MSCs. An analysis of the composite electrode morphology, structure, and elemental distribution was conducted through the utilization of SEM, TEM, and XPS techniques. Following this, a comprehensive evaluation of the electrochemical performance of the flexible MSCs was carried out, which included cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and assessment of cyclic stability. The analysis of the CV results indicated that the MSCs achieved the areal capacitance of 5.78 mF/cm2at 5 mV/s. After 5000 cycles at a current density of 0.05 mA/cm2, the capacitance retention rate was 85.4%. The high areal capacitance and strong cycle stability of MSCs highlight the potential of PEDOT/reduced graphene oxide (PEDOT/rGO) electrodes in electrode applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shuguo Yu,Hongyan Zhang,Jun Zhang,Ziyan Hu
Respiratory monitoring is an effective method to assess human health and provides valuable information for early warning and diagnosis of respiratory diseases. However, respiratory monitoring equipment relies on traditional power supply model, which limits real-time monitoring of breathing in fields of outdoor adventure, nomadism and long-distance running. As a solution, a triboelectric nanogenerator (TENG)-driven self-powered humidity sensor for human breath monitoring was prepared. A flexible TENG composed of Ti 3 C 2 T x : PDMS composite film and Ni/Cu polyurethane foam sponge was used as self-powered part of the device, RGO-TiO 2 humidity sensor was used as the respiratory sensing part of the device. Compared with the traditional humidity sensor, TENG-driven self-powered RGO-TiO 2 (TENG-RGTO) shows high response (359.2), fast response/recovery time (1/5.2 s), good reversibility, small humidity hysteresis (0.54%) in the range from 0% RH to 95% RH. Furthermore, TENG-RGTO humidity sensor can realize recognition of breathing states at different frequencies and intensities in real time. Meanwhile, a breathing alarm device driven by humans is designed. This research not only broadens the application range of TENG but also provides a new design idea for self-powered breathing monitoring sensor.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiale Zhou,Kunquan Li,Zhuohan Chen,Xiaojing Su,Huali Xie,Lei Yao,Yunhui Wu,Xiaofan Zhang,Lu Chen,Xuting Wu,Wenjian Wu
Functional membranes with electrothermal/photothermal effects are considered an effective method for separating water/viscous crude oil mixtures. However, the loading of photothermal and electrothermal particles in polymeric membranes with poor compatibility will deteriorate the membrane performance, leading to the unstable photothermal/electrothermal effects. Therefore, we prepared a hydrophobic sandwich structure polyvinylidene fluoride/reduced graphene oxide/polydimethylsiloxane (PVDF/rGO/PDMS) composite membrane using a two-step electrospinning process, which improved the binding force between the photothermal/electrothermal particles and the matrix with the composite membrane exhibiting super fast electric heating and photothermal effect. The temperature of the composite membrane surface rapidly reached to 162.5 °C within 30 s at 25 V. In addition, the addition of graphene (GO) improved the mechanical properties of the composite membrane. Meantime, the composite membrane possessed stable hydrophobicity and lipophilicity, which was beneficial for separating water/viscous crude oil mixtures. Owing to the controllable pore structure and special wetting behavior, the water-in-oil emulsion was successfully separated. Importantly, the separation rates of the water/crude oil mixtures under the electrothermal effect was 2340 kg·m −2 ·h −1 ·bar −1 . Thus, this study provides a new method for preparing hydrophobic sandwich-like PVDF/rGO/PDMS composite membrane with electrothermal/photothermal effects, which has significant potential for engineering applications in high-viscosity crude oil removal and water-in-oil emulsion separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Donghui Li,Dan Han,Yi Chen,Yutao Hong,Qi Duan,Hongtao Wang,Xiuli He,Li Zhao,Weidong Wang,Shengbo Sang
In this work, we developed a high-performance NH 3 sensor based on GaN/rGO nanocomposites via a low-cost solvothermal method and subsequent nitridation process. The morphological, structural, and chemical compositions were investigated to demonstrate that GaN and rGO were coupled together by interfacial modulation, and the GaN/rGO heterostructure chemical bonds are successfully formed. Gas-sensing performance test results show that the fabricated GaN/rGO (2.2 wt%) NH 3 sensor exhibited a high response value (92%), fast response time (11 s), and low limit of detection (500 ppb) at room temperature . In addition, reproducibility, humidity, and long-term stability tests of the GaN/rGO sensor were also conducted in this work. The enhancement sensing mechanisms are attributed to the large specific surface area, the excellent conductivity of rGO, and resistance modulation effect of the heterojunction potential. Hence, the GaN/rGO gas sensor can be regarded as a promising sensing solution for atmospheric and exhaled NH 3 detection at room temperature.
研究领域:
材料科学
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传感器技术
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化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 24
·25286-25300
·
IF 2.914
Liu Fang,Che Yangli,Chai Qingwen,Zhao Mengfei,Lv Yan,Sun Hui,Wang Yongqiang,Sun Juan,Zhao Chaocheng
Copper and zinc composite oxides (Cu 2 O/ZnO) were synthesized by an impregnation-reduction-air oxidation method. A series of Cu 2 O/ZnO/rGO ternary composites were prepared by coupling with graphene oxide (GO) with different mass fractions in a solvothermal reaction system. The microscopic morphology, crystal structure, and optical characteristics of the photocatalysts were characterized. The degradation of p-Nitrophenol (PNP) and polyacrylamide (PAM) by photocatalytic materials under simulated solar irradiation were studied, and the degradation kinetics were also investigated. The results showed that cubic Cu 2 O was modified by ZnO nanorods and distributed on rGO nanosheets. The ternary Cu 2 O/ZnO/rGO nanocomposites have stronger simulated solar absorption ability and higher photodegradation efficiency than pure ZnO and binary Cu 2 O/ZnO nanocomposites. When the amount of Cu 2 O/ZnO/rGO-10 was 0.3 g L −1 , the degradation rate of 10 mg L −1 PNP reached 98% at 90 min and 99.6% of 100 mg L −1 PAM at 30 min. The photocatalytic degradation processes of PNP and PAM all followed the pseudo-first-order kinetic model. Free radical trapping experiments showed that superoxide radicals were the main active substances to improve photocatalytic efficiency. In addition, after four recycles, the catalytic efficiency of Cu 2 O/ZnO/rGO-10 was still over 90%. It showed that Cu 2 O/ZnO/rGO-10 was a promising catalyst for wastewater treatment because of its good photostability and reusability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bingbing Hu,Chuanlan Xu,Muhammad Kashif Aslam,Yuan Cen,Jiahong Hu,Yan Li,Yuping Liu,Chaozhong Guo,Danmei Yu,Changguo Chen
In this work, multilayer networks lanthanum-doped V 2 O 5 · n H 2 O@OAB (noted as La-VOH@OAB) binder-free thin film positive electrode has been first successfully synthesized via a simple and economical sol-gel and drop-coating methods. Benefiting from its unique architecture and the favorable synergetic contributions for rare earth metal ions of La 3+ and hydrophilic carbon of OAB, after the condition optimization, the 20%La-VOH@OAB-4 exhibits an excellent electrochemical performance with an ultrahigh specific capacitance of 612 F g −1 at a current density of 1 A g −1 , good rate capability (81.1%, the current density increases tenfold) and outstanding cycling stability (90.4% capacitance retention over 2000 cycles). In addition, flexible Fe 2 O 3 @rGO binder-free thin film negative electrode prepared with the similarly facile strategy demonstrates a high specific capacitance of 366 F g −1 due to Fe 2 O 3 nanoparticles tightly anchored on the rGO surface. The assembled 20%La-VOH@OAB-4//Fe 2 O 3 @rGO ASCs device within a voltage window of 1.7 V delivers a relatively high specific energy density of 56.3 Wh kg −1 at a power density of 849.9 W kg −1 with exceptional cycling stability (81.3% capacitance retention after 5000 cycles), moreover, two ASCs devices in parallel can light up a red LED for 3 min, demonstrating its potential in practical applications. This work provides a certain reference for the fabrication of environmentally friendly thin film electrodes for developing high efficient energy storage systems.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 8
·085708
·
IF 3.399
Jialiang Luo,Yubing Hu,Lei Xiao,Guangpu Zhang,Hu Guo,Gazi Hao,Wei Jiang
3D flower-like Fe3S4 microspheres and quasi-sphere Fe3S4-RGO hybrid-architectures were successfully fabricated by a facile template-free hydrothermal method. The results of morphology revealed that the single Fe3S4 was composed of many nanoflakes and the Fe3S4-RGO composites mainly distributed together into a ball up and down the RGO sheet. The electromagnetic parameters of the single Fe3S4 and Fe3S4-RGO composites could be controlled by adjusting different filler loading and the addition of different GO to achieve impedance matching. Both the single Fe3S4 and Fe3S4-RGO composites exhibited an excellent EM absorption ability. The minimum reflection loss (RL) of the single Fe3S4 with 50% filler loading could achieve −66.87 dB at 10.57 GHz for the thickness of 2.2 mm, and the absorption bandwidth (RL < −10 dB) could reach 3.49 GHz. For the Fe3S4-RGO composites, the minimum RL of FSR-1 could be −40.25 dB at 9.67 GHz with the thickness of 2.0 mm. In addition, the effective absorption bandwidth of FSR-2 could reach 3.85 GHz at only 1.45 mm and the minimum RL was −29.25 dB at 14.24 GHz. Consequently, the single Fe3S4 and Fe3S4-RGO composites are promising materials as a high performance and adjustable EM wave absorber.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Benjie Zhu,Guofei Jiang,Yan Lv,Fang Liu,Juan Sun
In oilfield produced water, polyacrylamide (PAM) is a kind of organic polymer , which may gradually degrade to produce a large number of acrylamide (AM) monomer , and cause great damage to the peripheral nervous system of human and animals. In order to improve its removal efficiency, rGO@Fe 3 O 4 /Cu 2 O@ZnO magnetic composites with strong hydrophobicity , high photocatalytic performance and recyclability was prepared. The degradation process of PAM on composites photocatalyst was studied by simulating the sunlight irradiation, and the magnetic recovery performance and photocatalytic stability of composite were explored. Finally, the photocatalytic degradation mechanism of rGO@Fe 3 O 4 /Cu 2 O@ZnO composite was discussed by free radical capture experiment. The results showed that the highest photocatalytic degradation efficiency was 97.3% when the mass ratio of GO@Fe 3 O 4 and Cu 2 O@ZnO was 1:5, the dosage of rGO@Fe 3 O 4 /Cu 2 O@ZnO was 0.6 g L −1 , pH value was 7 and the initial concentration of PAM was 100 g L −1 . After four cycles, the magnetic recovery and degradation efficiency of PAM can still up to 91.3% and 81%, respectively, which both meet the needs of magnetic recovery and photocatalysis . In addition, according to the free radical capture experiment, the main active species was superoxide radical (·O 2− ). This work provides a strategy for designing magnetic composites with hydrophobic and high catalytic for photodegradation of organic pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Fanghua Luo,Min Zhang,Songlin Chen,Jianfeng Xu,Chen Ma,Guohua Chen
Highly thermally conductive polymer composites are desirable for the thermal management of modern electronic devices. Although the thermal conductivity issue has been improved effectively with many methods, it always fails in maintaining the electrical insulation performance at the same time, which has become another great challenge. Here the sandwich-structured PVA/PVA-rGO/PVA (recorded as PVA/rGO) composite films simultaneously owning high thermal conductivity, excellent electrical insulation and outstanding flexibility were designed and prepared through self-construction strategy. The obtained results show that the prepared composite films achieved a high in-plane thermal conductivity of 4.00 W m −1 K −1 with only 5 wt% rGO loading, which was about 970% higher than that of pure PVA (0.413 W m −1 K −1 ). The high thermal conductivity is attributed to the formation of the homogeneous intermediate layer of PVA-rGO. In addition, the low filler loading makes the composite film remain excellent mechanical flexibility, and the PVA in the upper and lower layers of the composite film keeps good electrical insulation (volume resistivity beyond 10 9 Ω cm). The prepared composite films not only have great potential applications in the field of thermal management and flexible electronic devices but also have the possibility to conduct the mass production of polymer composites.
研究领域:
材料科学
·
热管理
·
聚合物复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yukun Wang,Hanyin Zhang,Renzong Hu,Jiangwen Liu,Teunis van Ree,Haihui Wang,Lichun Yang,Min Zhu
A ternary composite of Fe 3 O 4 /SnO 2 /rGO has been synthesized via a facile one-step hydrothermal method . In the composite, rGO serves as a conductive and robust matrix, Fe 3 O 4 and SnO 2 nanoparticles are uniformly loaded on the rGO nanosheets without aggregation, due to the space-confine effect of the simultaneous nucleation and growth of Fe 3 O 4 and SnO 2 nanocrystallites . As an anode material for lithium-ion batteries, the Fe 3 O 4 /SnO 2 /rGO nanocomposite exhibited a reversible capacity of 947 mAh g −1 at a current density of 200 mA g −1 in the first cycle, and maintained 831 mAh g −1 after 200 cycles. The cyclic performance and rate capability of the Fe 3 O 4 /SnO 2 /rGO are markedly improved compared with the binary counterparts of FeO x /rGO and SnO x /rGO obtained in the control experiment, as a result of enhanced structural stability and kinetics for charge and Li + transfer due to the synergetic effect in the ternary composite.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Aerzigu Xukeer,Jin Li
In this work, we synthesized the ternary nanocomposite of ZnO/TiO 2 /rGO and used as formaldehyde gas detection at room temperature (RT). The integration of rGO with the ZnO/TiO 2 heterostructure enhanced the composite’s responsiveness at RT. The presence of rGO enhanced conductivity, mechanical stability, and charge transfer, in addition to providing more active sites for CH 2 O molecule adsorption. Sensors based on ZnO/TiO 2 /rGO exhibited a response of 86 to 50 ppm formaldehyde, with response and recovery times significantly shortened to 11 s and 3 s, respectively. Additionally, the selectivity, stability, and repeatability of the sensors were also evaluated. Our method of sequentially combining ZnO with TiO 2 , followed by incorporating rGO to form a ternary heterostructure, effectively optimizes ZnO. This two-step approach addresses the limitations of slow desorption efficiency and low response associated with ZnO. We conducted first-principles computation to understand the sensing performance.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
X. Li,J. Li,Y. Zhang,P. Zhao
Ni-MOF derived NiO nanosheets growing on rGO have been successfully synthesized by a hydrothermal method following by a series of calcination procedures (300 °C, 400 °C, and 450 °C). The influence of the introduction of rGO and the calcination temperature on electrochemical performance of Ni - MOF derived NiO nanosheets as the electrode material were highlighted in detail. For the three-electrode test system, Ni-MOF derived NiO/rGO composites subjected to calcination at 300 °C demonstrated the highest specific capacitance (435.25 F·g −1 at 1 A·g −1 ), and maintained 68.00% of its initial value at 8 A·g −1 . Its specific capacitance was increased by 49.34% when compared with the initial value after 25,000 cycles at 50 mV·s −1 . With the increase in calcination temperature, the specific capacitance presented the downward tendency (400 °C: 171.50 F·g −1 at 1 A·g −1 , 450 °C: 116.00 F·g −1 at 1 A·g −1 ) due to the reduction in specific surface area originating from the agglomeration of NiO nanosheets. The introduction of rGO greatly enhanced the electrochemical performance of the composites treated at 300 °C (increased by 40.40% at 1 A·g −1 and 47.30% in specific capacitance at 8 A·g −1 ). The assembled hybrid supercapacitors (HSC) with Ni-MOF derived NiO/rGO composites (300 °C) and active carbon as the cathode and anode also displayed the outstanding electrochemical performance. The value of energy density reached to 76.96 Wh·kg −1 at the power density of 400 W·kg −1 . All these results confirm that the MOF-derived NiO/ rGO composite should be a potential electrode material for supercapacitors .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）