ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xincheng Ding,Weibing Zhong,Haiqing Jiang,Mufang Li,Yuanli Chen,Ying Lu,Jun Ma,Ashish Yadav,Liyan Yang,Dong Wang
Wearable piezoresistive sensors have attracted wide attention for application in human activities monitoring, smart robots, medical detection, etc. However, most of the sensing signals collected from the piezoresistive sensor are triggered by coupling forces, such as the combination of tension and pressure. Thus, the piezoresistive sensor would be incapable of accurately monitoring and evaluating specific human motion due to the mutual interference from tension and pressure, as the tension is difficult to be decoupled or eliminated from the coupling forces. Herein a prestretchable conductive yarn (PCY) sensor with pressure sensitivity but tension insensitivity was introduced to remove the disturbance from tension. The PCY-based piezoresistive sensor is tension insensitive (gauge factor of 0.11) but pressure sensitive (sensitivity of 187.33 MPa–1). The fabric-based pressure sensor assembled with cross-arranged PCY weft and warp revealed magnified pressure sensitivity compared with the single PCY yarn sensor, as well as tension insensitivity to strain and tensile angle. Moreover, it possessed benign cyclicity during 5000 cycles of pressing/releasing. Therefore, the fabric piezoresistive sensor based on weaved conductive yarns is suitable for highly accurate and large area pressure detection, such as monitoring massage intensity of acupuncture points.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7475-7488
·
IF 4.21
Song Quancheng,Zhan Zeying,Chen Binxia,Zhou Zehang,Lu Canhui
Polypyrrole (PPy) has received extensive attention in supercapacitor electrodes due to its promising electrochemical activity, while the poor cycling stability and densely packed structure limited its electrochemical performance. Herein, we demonstrate the fabrication of flexible and freestanding PPy@bacterial cellulose (BC)/MXene composite film with significantly enhanced electrochemical performance. PPy nanoparticles were uniformly deposited on BC nanofibers via in situ polymerization, and assembled with highly conductive MXene (Ti 3 C 2 T x ) nanoflakes through strong interfacial interactions. BC as a biological template can effectively disperse PPy nanoparticles. The intercalation of PPy@BC nanofibers into Ti 3 C 2 T x layers constructs hierarchically packed nanofibrous structure, which provides extensive accessible electrochemical active sites. Freestanding PPy@BC/Ti 3 C 2 T x (PBM) electrode exhibits superior specific capacitance (gravimetric and areal capacitance of up to 550 F g −1 and 879 mF cm −2 , respectively) and excellent capacitance retention of 83.5% after 10,000 cycles. In addition, the symmetric supercapacitor assembled by PBM papers present a high energy density of 33.1 W h kg −1 (power density of 243 W kg −1 ) and excellent capacitance retention. The elaborately designed nanostructure and PPy-Ti 3 C 2 T x hybridization make great contribution to the enhanced electrochemical performance, which provide a feasible method for the fabrication of conductive polymer-based high-performance flexible supercapacitor electrodes. Graphic abstract
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Zhengsong Fang,Jiangshan Feng,Xinlong Fu,Jing Li,Xuanhe Hu,Xiuli Xie,Dingshan Yu
A conceptually new class of humidity and pressure dual-responsive smart metal–water batteries (SMWBs) is presented, which displays self-tunable energy release and intriguing perceptibility of human respiration and environmental pressure. This battery is enabled by the direct contact of a metal (e.g., Mg or Zn) anode and a well-designed all-polymer dual-sensitive moisture electrode (DSME) made from semiconductive polymer (e.g., polypyrrole)-wrapped 3D macroporous polyurethane sponge, without additional electrolytes and separator. A DSME is cost-effective, easily scalable, compressible, and able to act as a moisture carrier, a hydrogen evolution catalyst, and a pressure and humidity dual-sensitive unit simultaneously. Unique three-in-one integration in the DSME enables favorable modulation of electron/mass transport or redox reactions in the SMWB upon different stimulations. Thus, the assembled SMWB not only delivers good discharge performance with smart energy management but also serves as a reliable self-powered bifunctional responsor for the real-time monitoring of respiration and the perceptibility of pressure. Based on various active metal–polymer pairs (Mg/Zn vs polypyrrole/polyaniline), we also developed a series of dual-responsive batteries, demonstrating a general design idea.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Na Wang,Xia Wang,Ying Zhang,Wenjing Hou,Yunzhen Chang,Hua Song,Yun Zhao,Gaoyi Han
The rapid development of personal electronic equipment has stimulated the research upsurge on flexible supercapacitors with high energy density and bending tolerance. Construction of flexible asymmetric supercapacitors can effectively improve the energy density via broadening voltage window. Up to date, most of the asymmetric devices are fabricated by assembling anode, cathode and separator together, which inevitably brings unnecessary mass and volume, and makes the components poorly contacted, and decreases the resistance to repeated bending of devices. To overcome these issues, we design an integrated flexible asymmetric supercapacitor. Continuous gold layers are deposited on the two sides of the porous organic film to form the Au/porous film/Au sandwich structure, and poly(3,4-ethylenedioxythiophene) (PEDOT) and polypyrrole-graphene oxide (PPy-GO) are then electrochemically deposited on two gold layers respectively to serve as the positive and negative electrode material. As expected, the obtained devices expand the operating voltage to 1.2 V when Li 2 SO 4 /polyvinylene alcohol is used as gel electrolyte. The optimal cell possesses energy density of 2.98 μWh cm −2 at 0.12 mW cm −2 , exhibits excellent bending tolerance (capacitance can retain 99.3% of its initial value after 10000 repeated bending cycles). Meanwhile, the devices can be connected in series by simple superposition and light up a light-emitting diode. This flexible integrated device may exhibit potential applications in the future.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaogeng Feng,Xiangjie Bo,Liping Guo
Rational design and synthesis of multifunctional electrocatalysts with high-efficient activity and robust stability toward the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly desirable, but remain a challenging step. Herein, a novel hollow bimetallic carbide/nitrogen-doped carbon nanotube (Co 6 Mo 6 C 2 @NCNT) is successfully synthesized through the simple pyrolysis of polypyrrole (PPy)-supported metal-organic framework (MOF) composite. Remarkable characteristics of the large surface area, hollow and porous structure, rich active sites and synergistic effect between Co 6 Mo 6 C 2 and NCNT arouse high catalytic efficiency. Notably, the Co 6 Mo 6 C 2 @NCNT presents excellent ORR catalytic activity (a high half-wave potential of 0.875 V vs . reversible hydrogen electrode (RHE) and diffusion-limited current density of 6.22 mA cm −2 ) via a four-electron pathway, together with outstanding stability and methanol tolerance over commercial Pt/C in 0.1 M KOH solution. The composite also exhibits superior HER performance, delivering a low overpotential of 122.14 mV at current density of 10 mA cm −2 , as well as good catalytic performance for OER in 1.0 M KOH solution. This work may provide some insight in design multifunctional electrocatalysts derived from MOF with advanced performance for sustainable energy technologies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Sumbal Farid,Weiwei Qiu,Jialin Zhao,Xuedan Song,Qing Mao,Suzhen Ren,Ce Hao
In recent years, a noticeable shifting from conventional fossil fuels to renewable energy based systems has embarked electrochemical splitting of water as the most promising way to produce clean energy of hydrogen. Generally, the lack of active and stable electrocatalysts for oxygen evolution reaction (OER) limits the practicability of water splitting as a renewable source of energy. In this work, interconnected 3D structure of cobalt oxides nanoparticles (Co 3 O 4 NPs) derived from ZIF-67 with nitrogen-doped carbon nanotubes (N-CNTs) of polypyrrole (PPy) origin is successfully synthesized as OER electrocatalysts. Impressively, the highly conductive N-CNTs that run through the Co 3 O 4 NPs not only endow the resulting product Co 3 O 4 /N-CNTs with large active surface area and enhanced charge transfer between Co 3 O 4 NPs, but also prevent Co 3 O 4 NPs from aggregation. As a result, the as-synthesized Co 3 O 4 /N-CNTs electrocatalyst exhibits outstanding OER activity with a low onset potential of ~1.37 V (vs RHE), overpotential of only 200 mV to attain a stable current density of 10 mA cm − 2 in basic media and very small Tafel slope of 40 mV dec − 1 . Moreover, the enhanced nitrogen-content also improves the OER kinetics by proficient charge transfer. The superb electrocatalytic performance and higher stability make the Co 3 O 4 /N-CNTs a proficient non-precious electrocatalyst for the OER.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Ciqun Xu,Guohua Fan,Yunpeng Qu,Yao Liu,Zidong Zhang,Runhua Fan
Metacomposites which unveil weakly negative permittivity have been regarded as a promising candidate for next-generation electronics. We propose to prepare such metacomposites by developing the core-shell structured WC/PPy composites. The regulation of properties, including reactance, conductivity, and permittivity, has been achieved by controlling the mass ratio of WC in the WC/PPy composite. Conductive networks are constructed when the WC fraction is increased to a certain level, leading to a weakly negative permittivity, which is related to the plasma oscillation of free electrons . Owing to Lorentz dielectric resonance, a frequency-regulated negative permittivity is also realized, which provides an alternative strategy to obtain negative permittivity. This work will push forward further research and applications of metacomposites.
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Qin Wang,Jin Li,Xianjun Tu,Hongbo Liu,Miao Shu,Rui Si,Calum T. J. Ferguson,Kai. A. I. Zhang,Run Li
Generation of efficient light-induced charge separation inside the photocatalyst is an essential factor for a high catalytic efficiency. The usual immobilization of metal or metal oxide particles on semiconductor photocatalysts offers an uncontrolled assembly of active sites during the reaction. The introduction of single metal atoms on photocatalysts can lead to extremely high atomic utilization and precise active sites. However, this approach is limited because of the lack of suitable photosensitizers for single atom immobilization. Here, we have designed photocatalytic carbon quantum dots with anchoring sites for single cobalt atoms in a defined Co–N4 structure via facile pyrolysis of vitamin B12. Carbon dots functioned as both light-harvesting antenna and support for the cobalt atom with high atom loadings up to 3.27 wt %. This new photocatalytic material demonstrated enhanced visible light absorption, efficient charge separation, and reduced electrochemical impedance, while single Co atoms acted as the active site with strong oxidative ability. As a result, the photocatalysts showed excellent visible light-promoted photocatalytic efficiency with oxygen evolution rates up to 168 μmol h–1 g–1 via water oxidation, imine formation with high conversion (∼90%) and selectivity (>99%), and complete photodegradation of organic dyes.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 5
·1033-1039
·
IF 5.047
Xiao-Hui Wang,Xue-Qiao Chen,Hong-Shang Peng,Xiao-Fei Wei,Xiao-Juan Wang,Kun Cheng,Yuan-An Liu,Wei Yang
Photothermal therapy following microscopic temperature detection can avoid overheating effects or insufficient heating, and thus improve therapeutic efficacy. In this study, biocompatible dual-functional nanoparticles (NPs) are constructed from polypyrrole (PPy) and rhodamine B (RB) by a one-step modified polymerization method. The polypyrrole serves as a photothemal agent, and rhodamine B acts as a temperature-sensing probe. The polypyrrole–rhodamine B (PPy–RB) NPs possess a high photothermal effect on irradiation by 808 nm laser, and a competent temperature sensitivity for the real-time temperature monitoring based on the emission intensity response of rhodamine B. After acting on HepG2 cells, the PPy–RB NPs can effectively induce cancer cell death, and the microscopic temperature is monitored by fluorescence feedback from rhodamine B during PTT by laser confocal microscopy. Hence, the proposed approach can supply a facile and promising way for the fabrication of effective theranostic nanoplatforms assisted by self-monitoring of cancer therapeutic processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jing Zou,Dongpeng Mao,Arramel,Neng Li,Jizhou Jiang
An optimum large specific surface area of sulfur-doped graphitic carbon nitride nanoflakes modified glassy carbon electrode (S-g-C 3 N 4 /GCE) is reported with promising lead ion (Pb 2+ ) detection capability. This sensor was designed and fabricated using thermal polycondesation reaction . In terms of high selectivity Pb 2+ performance, we noted that the sensor exhibited appreciable detection limit of 3.0 × 10 −9 mol L −1 (S/N = 3) within the ionic specimen concentration range of 7.5 × 10 −8 ~ 2.5 × 10 −6 mol L −1 and 2.5 × 10 −6 ~ 1 × 10 −3 mol L −1 . Corroborated by DFT calculations, we propose that the strong interaction of S-g-C 3 N 4 interface and Pb 2+ plays an important role to generate the aforementioned sensing characteristics. In practice, we conceived high detection of Pb 2+ ions that reside in lake-water and mineral samples in which percentage recovery of 88–103 can be obtained under high repetition rate. Thus, S-g-C 3 N 4 /GCE can be considered as sensitive and selective electrochemical sensor for a reliable detecting heavy metal ions in domestic sewage and industrial wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 1
·407-416
·
IF 4.912
Xinyang Ji,Kaixuan Wang,Yao Zhang,Haohao Sun,Yuanyuan Zhang,Tiange Ma,Zhuo Ma,PingAn Hu,Yunfeng Qiu
Searching for promising HER electrocatalysts is an urgent task for the practical application of hydrogen production by water electrolysis. The Mott–Schottky effect between a metal with larger work function and n-type semiconductor with a higher Fermi level will facilitate the electron transfer from the semiconductor toward the metal. As a result, it is possible to design optimal H* adsorption active sites with thermoneutral hydrogen adsorption free energy (ΔGH*). Herein, MoC nanoparticles with a diameter of about 3.4 nm embedded in N, P-codoped carbon were converted from well-defined polyoxometalates (around 1 nm) and polypyrrole nanocomposites by carbonization and further wrapped on the surface of CNTs. On the basis of improved electron transfer rate, increased carrier densities, and enhanced active site activities on MoC after lowering the work function due to the Mott–Schottky effect with n-type domains in N, P-codoped carbon, our electrocatalysts could drive the current density of 10 mA cm−2 at 175 mV with a Tafel slope of 62 mV dec−1 and TOF value of 1.49 s−1 at 150 mV, as well as long-term H2 production stability. The present study provides a new guideline for the design and preparation of Mott–Schottky HER electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 70
·40887-40894
·
IF 3.049
Xue Yang,Ke Ma,Libo Yang,Yujuan Chen,Yingmin Qu,Ying Wang,Xinyue Wang,Fan Yang,Qi Sun,Zhengxun Song,Zuobin Wang
This paper employs a spin-coated method to construct conductive polypyrrole (PPy) substrates which present superior properties for controlling the morphological structures and functions of bEnd.3 cells. The PPy substrates with a homogeneous particle size, uniform distribution and proper roughness show enhanced hydrophilic characteristics and improve cell adhesion to the substrates. The changes in the mechanical properties of cells and the responses to the designed substrates and magnetic field are also explored. Due to the synergistic effect between the magnetic field and the conductive PPy substrate, the cells cultured in such an environment exhibit applanate shapes with more branches and enhanced cell viability. In addition, the cells preferentially extend along the magnetic field direction. The mechanical characteristics of cells change significantly under varying magnetic intensity stimulations (5–16 mT). The satisfying effect on cells' morphology and outgrowth is acquired at the magnetic intensities of 9–10 mT and duration of 20 min, compared with other stimulated groups, while retaining cell viability. Moreover, the cells express higher adhesion up to 5.2 nN. The results suggest that the application of the PPy substrates and magnetic field is a promising candidate for the protection of neurovascular units and treatment of neurological diseases.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）