POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 6
·1898-1905
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IF 3.348
Datong Wu,Xue Cheng,Tianze Zhang,Hong Gao
With the development of technology, life is full of electromagnetic pollution; therefore we need to shield the electromagnetic signals that are undesirable and harmful to us. In this work, polypyrrole (PPy)/polydopamine (PDA)/Ti 3 C 2 T x composites were successfully prepared for electromagnetic interference shielding applications by a simple polymerization method and mixing process. We investigated the electrical conductivity, thermal properties, electromagnetic interference shielding effect (EMI SE), and its EMI attenuation mechanism of PPy/PDA/Ti 3 C 2 T x composites. By adjusting the content of Ti 3 C 2 T x in the PPy/PDA/Ti 3 C 2 T x composites (from 0 to 12 vol%), the conductivity of the composites increased considerably from 34.6 to 884.1 S m −1 , and the maximum EMI SE of the composites in K u -band varied accordingly from 4.30 to 21.82 dB. Additionally, the thermal stability of the PPy/PDA/Ti 3 C 2 T x (12 vol%) composite was improved due to the addition of Ti 3 C 2 T x and PDA, with a change in mass loss from 59.25% to 29.34% at 900°C. These results highlight that the investigated PPy/PDA/Ti 3 C 2 T x composites are promising materials for EMI shielding.
研究领域:
材料科学
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电子工程
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 6
·833
·
IF 4.034
Zhi Zhang,Qi Lv,Yiwang Chen,Haitao Yu,Hui Liu,Guangzhen Cui,Xiaodong Sun,Ling Li
To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.Keywords:graphene;polypyrrole;sandwich-like structure;electromagnetic absorption
研究领域:
材料科学
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电磁学
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9673-9679
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IF 10.733
Peng Mu,Wei Bai,Yukang Fan,Zheng Zhang,Hanxue Sun,Zhaoqi Zhu,Weidong Liang,An Li
Solar steam generation by heat localization has attracted much attention for its potential in the treatment of wastewater and seawater desalination. However, the preparation of a single-component solar receiver with low cost, simple preparation process, high mechanical strength and energy conversion efficiency is still a challenge. Herein, we report the preparation of kapok fiber-PPy aerogels with superwetting, porous structure, high light absorption, and high mechanical strength via polypyrrole modification of the Ca2+ crosslinked kapok fiber aerogels. The kapok fiber-PPy aerogels show three-dimensional structure with high porosity (94%), excellent light absorption (ca. 97%), low thermal conductivity (0.0241 W m−1 k−1) and high mechanical strength (0.12 MPa under 75% of strain). As a solar steam generation device, a high energy conversion efficiency of 82.4% was achieved under 1 kW m−2 illumination. The findings of this investigation may open a simple and novel route towards the fabrication of a low-cost a single-component biomass-based solar receivers for solar steam generation.
研究领域:
材料科学
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能源研究
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高影响因子
ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Yin Qiao,Jiahao He,Yang Zhou,Shibo Wu,Xiaoyan Li,Guangming Jiang,Guohua Jiang,Muslum Demir,Pianpian Ma
The defective structure and high oxygen vacancy concentration of SrFeO3−δ perovskite enable fast ion-electron transport, but its low conductivity still hinders the high electrochemical performance. Herein, to enhance the conductivity of SrFeO3−δ-based electrodes, polypyrrole-modified SrFeO3−δ perovskite on carbon cloth (PPy@SFO@CC) has been successfully fabricated by electrodeposition of polypyrrole (PPy) on the surface of SFO@CC. The optimal PPy700@SFO@CC electrode exhibits a specific capacitance of 421 F g–1 at 1 A g–1. It was found that the outside PPy layer not only accelerates the electron transport and ion diffusion but also creates more oxygen vacancies in SrFeO3−δ, enhancing the charge storage performance significantly. Moreover, the NiCo2O4@CC//PPy700@SFO@CC device maintains a specific capacitance of 63.6% after 3000 cycles, which is ascribed to the weak adhesion forces between the active materials and carbon cloth. Finally, the all-solid-state flexible supercapacitor NiCo2O4@CC//PPy700@SFO@CC is constructed with PVA-KOH as the solid electrolyte, delivering an energy density of 16.9 W h kg–1 at a power density of 984 W kg–1. The flexible supercapacitor retains 69% of its specific capacitance after 1000 bending and folding times, demonstrating a certain degree of foldability. The present study opens new avenues for perovskite oxide-based flexible all-solid-state supercapacitors.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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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.
研究领域:
材料科学
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能源化学
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Nano Research
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2023
·
IF 9.9
Xi Guangshuai,Zhang Dongzhi,Tang Mingcong,Zhang Hao,Sun Yuehang,Zhang Yubiao,Cai Haolin,Xia Hui,Zhou Dandi
In recent years, multi-modal flexible tactile sensors have become an important direction in the development of electronic skin because of their excellent sensitivity, flexibility and wearable properties. In this work, a humidity-pressure multi-modal flexible sensor based on polypyrrole (PPy)/Ti 3 C 2 T x sensitive film packaged with porous polydimethylsiloxane (PDMS) is investigated by combining the sensitive structure generation mechanism of in situ polymerization to achieve the simultaneous detection of humidity and pressure, which has a sensitivity of 89,113.4 Ω/% RH in a large humidity range of 0%–97% RH, and response/recovery time of 2.5/1.9 s. The tactile pressure sensing has a high sensitivity, a fast response of 67/52 ms, and a wide detection limit. The device also has excellent performance in terms of stability and repeatability, making it promising for respiratory pattern and motion detection. This work provides a new solution to address the construction of multi-modal tactile sensors with potential applications in the fields of medical health, epidemic prevention.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Mingming Chen,Qinghua Gu,Huiping Shao,Haihong Liu,Jingde Luan,Zheng Yan,Wengang Liu,Xin Ke
In this study, the PPY/CMC aerogels showed rapid removal of norfloxacin (NOR) within 2 h with a maximum adsorption capacity of 845.7 mg/g and excellent adsorption performance in the pH range of 3–10. The exhaustive Density Functional Theory (DFT) calculations revealed that π-π electron-donor–acceptor (EDA) interactions dominated at different pH. Humic acid (HA) mainly competed with NOR for the sites of π-π EDA interactions on the adsorbent, but only slightly inhibited NOR adsorption at high concentrations due to the weak competitiveness and compensation by NOR-bridging interactions. Background ions mainly competed with NOR for electrostatically interacting sites, but ions in the lower valence state were less competitive and preferentially occupied different adsorption sites, thus hardly affecting the adsorption of NOR. The higher valence state with higher concentration of ions had increased competing ability, and although the bridging interaction can compensate some adsorption sites, it still inhibited the adsorption of NOR. The PPY/CMC aerogels had fine affinity for multiple antibiotics, and the differences in adsorption capacity were determined by the charge and structural properties of the antibiotics themselves. Moreover, excellent recyclability of PPY/CMC aerogels was confirmed after five adsorption–desorption cycles as the diminished performance from 96.8% to 83.7%. These results will help us to understand the structure-performance relationship between contaminants and PPY/CMC aerogels, and prefigure the potential of PPY/CMC aerogels as a novel adsorbent for the removal of multiple antibiotics.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Yu Bai,Dongmei Han,Min Xiao,Zhiheng Huang,Chengxin Wang,Shuanjin Wang,Yuezhong Meng
Polypyrrolone (PPy) possesses excellent heat resistance and mechanical properties , moreover, the N-heterocycle contained in the PPy allows the absorption of phosphoric acid (PA) for proton conduction. In the present work, PPy is synthesized by a two-step method and evaluated for the first time as the polymeric material for high temperature proton exchange membranes (HT-PEMs). The PA-doped PPy membrane reaches a peak power density of 582 mW cm −2 at 160 °C under fully anhydrous conditions, besides, the fuel cell exhibits excellent durability over a period of 300 h with a load voltage decay of only 0.032% per hour and remains 0.647 V after the test. Further, the PPy-impregnated polyimide (PI) nanofiber mat composite membrane (PI@PPy) with an optimal thickness is fabricated with enhanced dimensional stability, of which acid swelling ratio noticeably declined by 51% in area and 25% in volume. A higher peak power density (634 mW cm −2 ) and less cell voltage reduction is also observed in the composite membrane, benefits from the trade–off between proton conductivity and PA retention ability. The results of the present study may contribute to further studies on polypyrrolone-based HT-PEMs and composite membranes.
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高影响因子
SYNTHETIC METALS
·
2022
·
IF 4
Yanhua Lei,Mengchao Ding,Haikun Wu,Di Yin,Yang Li,Bochen Jiang,Kai Sun,Yuliang Zhang,Hailiang Du
In this work, the layered Ti 3 C 2 T x MXene were coated with polypyrrole particles by an in-situ polymerization method, and their electromagnetic wave absorption performance were systematically studied. The MXene/PPy composites presented an excellent electromagnetic wave absorption performance, the strongest reflection loss can reach − 68 dB at 2.68 mm. Meanwhile, when the thickness is 2.26 mm, the effective absorption bandwidth can reach 6.56 GHz (from 11.44 to 18 GHz), covering the entire K u band (12–18 GHz). The multiple reflections at the heterogeneous interface, and the synergistic effect between the layered MXene and the conductive polypyrrole network made a combined effect on the optimized absorption. The MXene/PPy composites with a strong electromagnetic wave absorption, wide effective absorption bandwidth and corrosion resistance have a great value in aircraft and vessel fields.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Yanyan Chen,Manlin Zhang,Tiantian Chen,Ganbing Zhang,Hui Xu,Hongwei Sun,Lizhi Zhang
The application of powdered nanoscale zero-valent iron (nZVI) in conventional reactors for water treatment is limited by insufficient mass-transfer and difficult post-separation of catalysts. Herein, a novel microreactor was constructed by anchoring nZVI on the reduced graphene oxide/polypyrrole nanocomposite (rGO/PPy) substrate within the microchannel of a stainless-steel tube through two-step electrodeposition , which catalyzed the Fenton-like reaction to remove > 99% p-nitrophenol (PNP) within 50 s, outperforming traditional batch reactors. The rGO/PPy composite substrate consolidated the adhesion on steel surface, stabilized the nZVI by forming electron-transfer complex, facilitated the decomposition of H 2 O 2 to free •OH, and promoted the redox cycle of Fe(III)/Fe(II) via the electron donating capacity of rGO/PPy. Besides, the significant convection and highly-effective mass transfer within the microreactor also contributed to the ultrafast PNP removal. With acceptable durability, easy re-generation, and scalability, the rGO/PPy/nZVI microreactor is promising for the ultrafast removal of pollutants from water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mingming Chen,Zheng Yan,Jingde Luan,Xun Sun,Wengang Liu,Xin Ke
In this work, a hydrophilic polypyrrole carboxymethyl cellulose aerogel (PPY/CMC) with a 3D structure was prepared via in-situ polymerization of pyrrole monomers with carboxymethyl cellulose as the substrate. The adsorption experiments showed that tetracycline can be effectively removed in a wide range of pH (4–10), and the adsorption capacity was 689.39 mg/g when the pH value was 6. The pseudo-second-order kinetic and Langmuir models better fitted the kinetic and isotherm data, which revealed that the adsorption was homogeneous and dominated by chemisorption. The experiment of adsorption thermodynamics showed that the adsorption process was spontaneous and endothermic. Zeta potential, FT-IR and XPS results indicated that the adsorption mechanism included π-π EDA interaction, hydrogen bonding and electrostatic interaction. Through Density Functional Theory (DFT) and Frontier Orbital Theory (FOT) simulation, the microscopic adsorption mechanism was further explored on the molecular and electronic scales. It is confirmed that TC was adsorbed onto PPY/CMC aerogels mainly through π-π EDA interaction in sandwich (S) configuration and parallel-displaced (PD) configuration, thus ensuring high adsorption efficiency. Compared with various adsorbent materials reported recently, the PPY/CMC aerogels have the advantages of higher adsorption capacity, excellent pH buffering capacity, simple preparation process and quickly removal of pollutants.
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Nanoscale
·
2022
·Vol. 14
·期 48
·18133-18142
·
IF 8.307
Fushuo Wu,Zhihua Tian,Peiying Hu,Jingwen Tang,Xueqin Xu,Long Pan,Jian Liu,Peigen Zhang,ZhengMing Sun
Lightweight and flexible multifunctional materials with excellent electromagnetic interference (EMI) shielding and Joule heating performances are highly demanded for smart and wearable electronics. In this work, polyacrylonitrile (PAN) nanofiber films are prepared by electrospinning and then coated with polypyrrole (PPy) via vapor deposition, yielding a continuous three-dimensional (3D) conductive network of PAN@PPy. Ti3C2Tx MXene nanosheets with high electrical conductivity are sprayed on the PAN@PPy film to enhance its EMI shielding performance. The as-prepared PAN@PPy/MXene films (55 μm thick) exhibit a high EMI shielding effectiveness (SE) of 32 dB, achieving an extraordinarily high normalized surface-specific SE (SSE/t) of up to 17 534.5 dB cm2 g−1 from 8.2 to 12.4 GHz; simultaneously, the temperatures of PAN@PPy/MXene films can be driven up to 170.5 °C at an input voltage of 4 V, and exhibit fast-response, stable, and long-term Joule heating performance. The high SSE/t and efficient Joule heating ability of the films bode potential applications in smart and wearable devices.
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高影响因子
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