MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Yongchuan Liu,Xiaofei Miao,Xiangxin Zhang,Sujing Chen,Yuanqiang Chen,Jian Cheng,Wei Wang,Yining Zhang
Combining graphene with iron oxide has shown great promise in mitigating the pulverization of iron-oxide anode during fast charge/discharge in lithium-ion batteries. However, the attachment between hydrophilic iron oxide and hydrophobic graphene sheets could potentially compromise during cycling, affecting its cycling stability. By exploiting the polymerization characteristics of pyrrole, we anchor and subsequently wrap the Fe(OH) 3 colloidal nanoparticles onto graphene oxide surface with polypyrrole. The composite is further annealed to give polypyrrole-derived-carbon (PPy-C) wrapped Fe 3 O 4 @graphene (Fe 3 O 4 @graphene@PPy-C). PPy-C strengthens the interaction between the Fe 3 O 4 and the graphene and helps preserving the structural integrity during cycling. As an anode material, Fe 3 O 4 @graphene@PPy-C composite exhibits a high reversible capacity of 721 mA h g −1 over 320 cycles at a current density of 0.2 A g −1 . Even at a high current density of 2 A g −1 , the electrode still achieves a high capacity of 406 mA h g −1 . This strategy provides a new alternative to improve the cycling stability of iron-oxide/carbon composite anodes.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Muhammad Atif Ali,Bushra Shakoor,Naila Arshad,Muhammad Sohail Asghar,Ghazala Maqsood,Muhammad Sultan Irshad,Xianbao Wang
A 3D coaxial cylindrical CuS/PPy nanoflower fabric is fabricated. • Convective heat recycling for high-efficiency solar water evaporation. • Achieved a remarkable evaporation rate of 3.21 kg m −2 h −1 and salt rejection. • Offered a scalable and durable platform for sustainable clean water production. Solar steam generation is thermodynamically limited by parasitic heat loss to bulk water and the surroundings. Herein, we overcome this limitation by designing a coaxial, dual-cylinder evaporator that actively recovers convective waste heat to boost vapor yield. A scalable photothermal textile is sequentially fabricated via facile deposition of copper sulfide (CuS) nanoflowers onto cotton fabric, followed by in-situ vapor-phase polymerization of polypyrrole (CuS/PPy/CF). The resulting CuS/PPy heterostructure delivers broadband absorption (>94%) and rapid thermalization. This fabric is integrated onto two concentric copper mesh cylinders of different diameters, creating an annular air channel. Under illumination, the outer cylinder drives primary evaporation, while the inner cylinder harvests latent heat and warm vapor flux from the channel. This recuperative convective exchange elevates the inner surface temperature beyond the ambient wet-bulb temperature, enabling cold evaporation from the exterior while sustaining high-temperature steam release from the interior. The coaxial architecture achieves an evaporation rate of 3.21 kg m −2 h −1 under 1 sun, well above the theoretical planar limit, and maintains stable performance in high-salinity brine. This work introduces a facile, scalable textile-engineering approach and a convective heat-recycling geometry that redefines the efficiency ceiling for passive solar desalination. We report a 3D coaxial cylindrical CuS/PPy nanoflower fabric built with convective heat recycling for a high evaporation rate of 3.21 kg m −2 h −1 under 1 sun and salt rejection, ensuring sustainable desalination Download: Download high-res image (163KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Min Zhang,Baolong Li,Yu Du,Gaojian Zhou,Yanyan Tang,Yanfen Shi,BiYu Zhang,Zhou Xu,Qingli Huang
The preparation and construction of novel nanostructures as targeting theranostic is of great significance for diagnosis and treatment of tumor. Herein, a novel PANI/ [email protected] @MnO 2 (PPAuMns) yolk-shell enzymatic theranostic agent was fabricated firstly via in situ deposition of Au nanoparticles (Au NPs) and reduction of KMnO 4 on the surface of PANI/PPy nanocomposites. In addition to high biocompatible and biodegraded performance, PPAuMns possessed amazing tumor microenvironment (TME)-responsive O 2 generation capacity, magnetic resonance imaging (MRI) property, enzymatic activity and excellent photothermal conversion effect. Chemotherapeutics doxorubicin and folic acid (FA) were further loaded and decorated on it for targeted tumor therapy. Experiments in vitro and in vivo indicated that DOX-loaded [email protected] demonstrated excellent synergistic anti-tumor effect combining chemotherapy (CT), chemo-dynamic therapy (CDT) and photothermal therapy (PTT). This work offers a paradigm to design and construct tumor diagnosis and therapy platforms employing TME-responsive synergistic strategy of photothermal ablation, chemo-dynamic and chemotherapy.
研究领域:
纳米技术
·
生物医学工程
·
癌症治疗
·
材料科学
·
医学成像
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Pan Xu,Hongru He,Jiyong Fang,Tiantian Shang,Shan Wang,Shuyuan Ge,Shuoqi Wu,Xigui Yue
A heterostructured polypyrrole@magnetic Co/CoFe 2 O 4 nanoparticles@hollow nanobowl-like carbon (PPy@Co/CoFe 2 O 4 @HNBC) composite with a layer-by-layer (LBL) structure based on HNBC was prepared via a facile three-step process. HNBC was synthesized by a typical template method, then sequentially decorated with Co/CoFe 2 O 4 and PPy via in-situ growth and polymerization. The relationship between the structure, components, and electromagnetic wave (EMW) absorption performance of PPy@Co/CoFe 2 O 4 @HNBC was studied in depth. The EMW absorbing research shows that PPy@Co/CoFe 2 O 4 @HNBC exhibits excellent EMW absorption capability, with a minimum reflection loss (RL min ) of up to −61.85 dB at 12.80 GHz and 1.90 mm and a widest effective absorption bandwidth (WEAB, RL≤−10.00 dB) value of 5.60 GHz at 1.70 mm. The excellent EMW absorption performance of PPy@Co/CoFe 2 O 4 @HNBC can be ascribed to the multiple reflection and scattering that occurs due to its unique microstructure and the synergistic effects between the polarization and conduction induced dielectric loss , and the natural resonance and exchange resonance induced magnetic loss. As a consequence, the PPy@Co/CoFe 2 O 4 @HNBC composite designed in this work is a hopeful candidate for application in the field of EMW absorption.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
·
2021
·
IF 5.497
Yuan Yang,Guangsheng Zhou,Dezhan Ye,Zikui Bai,Zhongmin Deng,Jie Xu
Continuous real-time human motion and heart-rate monitoring systems can provide vital clinical information for disease diagnosis, preventive healthcare and rehabilitation care. However, it is still a challenge to design wearable pressure/strain sensors with great flexibility and sustainable power for motion detection and physiological signal monitoring. Here, a self-powered laminated fabric sensor based on Schottky contact was successfully fabricated. This laminated fabric sensor was constructed by sandwiching the polypyrrole (PPy)-coated fabric with the Ni-coated fabric and Al plastic film. The electrical outputs under strain were attributed to the single Schottky contact between PPy and Al. This fabric sensor exhibited excellent stability under continuous quick cycling operation and at high relative humidity, which could be adapted to different human body parts for continuous motion detection and heart-rate monitoring. This work is of great significance to demonstrate a promising strategy toward self-powered wearable pressure sensors used for human motion detecting and hear-rate monitoring.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
BIOCONJUGATE CHEMISTRY
·
2022
·
IF 6.069
Chunxiao Sui,Rui Tan,Zifan Liu,Xiaofeng Li,Wengui Xu
Imaging-guided photothermal therapy (PTT) in a single nanoscale platform has aroused extensive research interest in precision medicine, yet only a few methods have gained wide acceptance. Thus, it remained an urgent need to facilely develop biocompatible and green probes with excellent theranostic capacity for superior biomedical applications. In this study, a smart chemical oxidative polymerization strategy was successfully developed for the synthesis of Au@PPy core–shell nanoparticles with polyvinyl alcohol (PVA) as the hydrophile. In the reaction, the reactant tetrachloroauric acid (HAuCl4) was reduced by pyrrole to fabricate a gold (Au) core, and pyrrole was oxidized to deposit around the Au core to form a polypyrrole (PPy) shell. The as-synthesized Au@PPy nanoparticles showed a regular core–shell morphology and good colloidal stability. Relying on the high X-ray attenuation of Au and strong near-infrared (NIR) absorbance of PPy and Au, Au@PPy nanoparticles exhibited excellent performance in blood pool/tumor imaging and PTT treatment by a series of in vivo experiments, in which tumor could be precisely positioned and thoroughly eradicated. Hence, the facile chemical oxidative polymerization strategy for constructing monodisperse Au@PPy core–shell nanoparticles with potential for cancer diagnosis and imaging-guided photothermal therapy shed light on an innovative design concept for the facile fabrication of biomedical materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Guoqing Feng,Shihan Wang,Siqing Wang,Pengcheng Wang,Chuntao Wang,Andargie Abebe Setiye,Massamba-Courtois Joanes Benedicte,Jingkun Xiao,Chengwen Song
Assembling a heterojunction-based composite nanomaterial to simultaneously achieve higher response and superior selectivity towards NO 2 under room-temperature conditions remains a great challenge. In this work, the MXene@Polypyrrole heterojunction was synthesized via a facile in-suit chemical polymerization approach. The distribution of sphere-like PPy nanoparticles was confirmed via various characterization techniques. The response value of the 0.5MXP sensor toward 50 ppm NO 2 is significantly higher than that of the pristine MXene based sensor, entailing greater response (6.5-fold). Nearly 98.11% recovery to the base resistance was observed in each sensing cycle. Noteworthy, the Schottky barriers formed between MXene and PPy contact surface, leading to the ideal selectivity and a lower limit of detection. Additionally, the sensor was tested for a 31-days-period with minimal deviation, predicting outstanding reproducibility and durability. The detailed polypyrrole sensitization mechanism containing selectivity mechanism, underlying heterojunction mechanism as well as the Density Function Theory (DFT) calculation were also revealed, offering new ideas for the development of room-temperature nitrogen dioxide sensors. Simultaneously, DFT calculation (21 models, 42 images) revealed the adsorption energy, electron transfer , and charge density differences between the NO 2 molecules and the substrate (MXene, PPy and MXene@PPy). In summary, the outstanding MXene surface functionalization has been exploited by decorating with polypyrrole (PPy) nanoparticles.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Xing Lai,Chun Wang,Liming Wang,Changfa Xiao
In this study, a stable and controllable poly( p -phenylene terephthamide)/polypyrrole (PPTA/PPy) composite organic solvent nanofiltration (OSN) hollow fiber membrane was successfully prepared based on the robust chemical vapor deposition (CVD) method. The structure and properties of the prepared PPTA/PPy OSN membranes were studied in detail. Interestingly, after modifying by PPy, SEM showed that the surface of the membrane formed a layer of “Turing-like” structure and evenly covered the surface of the membrane. It was evident that the prepared PPTA/PPy OSN membranes achieved good dye-removal ability with a molecular weight cut-off range from 200 to1000 Da, and the rejection of negative dyes was higher than 93.4%. Especially at high temperature (80 °C) and organic solvent ( N , N -dimethylacetamide, DMAc), the PPTA/PPy OSN membranes still exhibited excellent permeation and separation performance. Furthermore, at room temperature, the immersion experiment of the fabricated PPTA/PPy OSN membranes in both ethanol and DMAc for one month also proved the stability of long-term organic solvents. Based on the above results, this work offered a novel PPTA based hollow fiber nanofiltration membrane, which was expected to be applied in thermal and organic dye wastewater treatment .
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Lizhong He,Zengpeng Guo,Najeeb ur Rehman Lashari,Gexi Wang,Mengbin Li
To cater to the mushrooming advanced energy storage devices need, designing and preparing novel electrode materials with excellent electrochemical properties (including high capacitance and prominent cycling stability) are urgent but challenging. Here, we successfully synthesized 3D hierarchical NiCo 2 O 4 @Co 3 S 4 @MnS@PPy (NC@CS@MS@PPy) core-sheath nanowire arrays grown on highly conductive carbon cloth using a multistage process. Owing to a lot of synergy between the multiple components in the as-obtained composite, the prepared electrode material indicates an excellent specific capacitance of 2.67 F cm −2 at 1 mA cm −2 or 2557.58 F g −1 at 1 A g −1 and high cycling stability (83.64 % capacitance retention after 20,000 cycles even at a high current density of 20 mA cm −2 ). When coupled with the activated carbon (AC, as a negative electrode), the assembled all-solid-state NC@CS@MS@PPy//AC asymmetric supercapacitor (ASC) device showed outstanding electrochemical properties with a high area specific capacitance 684.38 mF cm −2 at 3 mA cm −2 and better long-term cycling stability (96.76 % retention of the initial capacitance after 20,000 cycles). More importantly, by taking advantaging of the multiple compositional merits and structural features of the positive electrode , the device delivered the highest energy density of 81.1 Wh kg −1 at 800 W kg −1 and retained 26.2 Wh kg −1 at the highest power density of 16 KW kg −1 . Furthermore, two ASCs connected in series powered 20 red light-emitting diodes (LEDs) for >10 min. This work manifests that the prepared hierarchical NC@CS@MS@PPy core-sheath nanowire arrays have impressive potential as high-performance electrodes for supercapacitor.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Sun,Xiang Zhang,Hao Yuan,Hongmin Cong,Yuxing Shi,Jialin Lu,Weilong Shi,Feng Guo
Converting waste biomass into solar evaporator foam has been recognized as an effective strategy for waste recycling and solving the problem of water shortage, but problems of salt deposition and mechanical stability seriously hinder their practical application. Herein, this work proposes a sustainable and high mechanical strength biomass foam (CDs/PPy-CPP) evaporator with zero-dimensional/one-dimensional (0D/1D) hierarchical structure by hydrophilic carbon dots (CDs) and tubular polypyrrole (PPy) are seamlessly integrated into the outer surface of the three-dimensional (3D) carbonized pomelo peel (CPP) biomass foam. The evaporator achieved a high-efficient evaporation rate of up to 2.46 kg m −2 h −1 in 3.5 wt% NaCl solution at 1 sun irradiation, and similarly exhibited outstanding salient evaporation efficiency and resistance to salt deposition in 25 wt% NaCl solution, as well as prominent swage purification ability. Excellent photothermal conversion efficiency is demonstrated attributed to the 0D/1D structure in 3D networks of the CDs/PPy-CPP evaporator, as well as superior mechanical and water transport properties based on the multilayer mesh structure and microscopic water transport pores. The research intends to offer a low-cost, energy-efficient, and environmentally friendly approach to obtain multifunctional photothermal biomass foams and demonstrate the potential applications in seawater desalinization and swage purification.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yusheng Li,Yun Feng,Li Li,Keyan Wu,Xiangjie Bo,Jianbo Jia,Liande Zhu
Due to the obstacle of sluggish kinetics on cathode of fuel cells and metal–air batteries, developing low-cost and durable electrocatalysts to replace the platinum-based catalysts still remains a grand challenge. Here, we describe a simple self-template approach to synthesize N-doped mesoporous carbon nanocages (FeCo@NC) embedded with FeCo alloy nanoparticles as oxygen reduction reaction (ORR) electrocatalyst. The resulting heterostructure is derived from corresponding PBA@PPy composites, which are pre-prepared by polymerization of polypyrrole (PPy) layer on Prussian blue analogue (PBA) nanocubes. The FeCo alloy nanoparticles with an average particle size of ∼10 nm are well dispersed and confined within the shell of carbon nanocages. Benefiting from the mesoporous structure and the synergetic interaction of binary metals, the optimized FeCo@NC-3-800 electrocatalyst exhibits comparable ORR performances (0.83 V for half-wave potential (E 1/2 ), 5.323 mA cm −2 for limiting current density (J k )), superior durability and excellent methanol tolerance to the commercial Pt/C (20 wt%). This work provides an appropriate strategy for general, efficient and practical synthesis of more promising non-precious metal electrocatalyst with high ORR activity.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2333
·
IF 5.076
Huiying Shen,Huizhen Ke,Jingdong Feng,Chenyu Jiang,Qufu Wei,Qingqing Wang
Owing to the multi-dimensional complexity of human motions, traditional uniaxial strain sensors lack the accuracy in monitoring dynamic body motions working in different directions, thus multidirectional strain sensors with excellent electromechanical performance are urgently in need. Towards this goal, in this work, a stretchable biaxial strain sensor based on double elastic fabric (DEF) was developed by incorporating carboxylic multi-walled carbon nanotubes(c-MWCNTs) and polypyrrole (PPy) into fabric through simple, scalable soaking and adsorption-oxidizing methods. The fabricated DEF/c-MWCNTs/PPy strain sensor exhibited outstanding anisotropic strain sensing performance, including relatively high sensitivity with the maximum gauge factor (GF) of 5.2, good stretchability of over 80%, fast response time < 100 ms, favorable electromechanical stability, and durability for over 800 stretching–releasing cycles. Moreover, applications of DEF/c-MWCNTs/PPy strain sensor for wearable devices were also reported, which were used for detecting human subtle motions and dynamic large-scale motions. The unconventional applications of DEF/c-MWCNTs/PPy strain sensor were also demonstrated by monitoring complex multi-degrees-of-freedom synovial joint motions of human body, such as neck and shoulder movements, suggesting that such materials showed a great potential to be applied in wearable electronics and personal healthcare monitoring.Keywords:double elastic fabric;carbon nanotube;polypyrrole;multidirectional;strain sensor;complicated human motions detection
✓ 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）