Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 26
·13095-13105
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IF 11.301
Qiujun Hu,Zhongxu Lu,Yizhuo Wang,Jing Wang,Hong Wang,Ziping Wu,Guanghao Lu,Hao-Li Zhang,Choongho Yu
Multi-walled carbon nanotubes (MWCNTs) have shown low n-type Seebeck coefficients (−10 μV K−1), which are not good enough to prepare high performance low-cost MWCNT based mechanically flexible thermoelectric devices. Here, we present a double doping approach utilizing a small n-type doping molecule, 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzimidazole (N-DMBI), in addition to encapsulated metal (iron) nanoparticles for achieving a high n-type thermoelectric performance with MWCNTs. With double doping, we have shown high n-type Seebeck coefficients up to −56 μV K−1 along with a power factor up to 112 μW m−1 K−2 at room temperature, which, to the best of our knowledge, is at least an order of magnitude higher than the power factors of previously reported n-type MWCNT based organic materials. More importantly, the negative Seebeck coefficient was maintained even after 60 days' exposure to air. An outstanding output power of 1.9 W m−2 at a temperature difference of 60 K was generated with a flexible thermoelectric device made of only MWCNT mats. The new findings could lead to the development of robust and flexible thermoelectric devices made of only low-cost MWCNTs.
研究领域:
材料科学
·
热电学
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纳米技术
·
柔性电子
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Yanan Deng,Yuanyuan Shen,Yao Du,Takashi Goto,Jianfeng Zhang
The development of high-performance electrode materials with a far-from-enough energy density has still been crucial for the real applications of supercapacitor technology. In this paper, the N-doped and derivatized-carbon-intercalated Ti 3 C 2 T x , abbreviated as N–Ti 3 C 2 T x /C, was firstly fabricated using ZIF-67 as an intermediate precursor. Then N–Ti 3 C 2 T x /C/CuS was prepared by further intercalation with CuS nanoparticles through a room-temperature-in-situ-reaction route. The doped pyridine N and pyrrolic N, together with derivatized carbon, optimized the surface charge distribution of Ti 3 C 2 T x with increased active sites. In addition, CuS nanoparticles were observed distributed on the surface and between layers of single/multi-layered two-dimensional N–Ti 3 C 2 T x /C nanosheets, forming a heterogeneous three-dimensional structure. Therefore, the specific capacitance of the N–Ti 3 C 2 T x /C/CuS composite at a current density of 1 A g −1 reached 1205.8 F g −1 , about 5 times that of N–Ti 3 C 2 T x /C and 2 times of CuS, also much higher than other composite reported in the literature. The energy density and power density of N–Ti 3 C 2 T x /C/CuS, as a symmetric supercapacitor electrode, are 77.22 Wh·kg −1 and 649.54 W kg −1 , respectively. More importantly, N–Ti 3 C 2 T x /C/CuS has an excellent stability after 3000 cycles, surpassing that of similar electrode materials reported in literature. This study opens a new direction for enhancing the energy density of supercapacitors with modified electrode materials through a MOF-mediated strategy.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10352-10358
·
IF 3.288
Danlin Bu,Na Li,Yu Zhou,Hengyu Feng,Fei Yu,Chunxia Cheng,Ming Li,Linghan Xiao,Yuhui Ao
N-Halamine-based antibacterial materials are widely used due to their excellent characteristics. However, the N–Cl bonds in N-halamine-based materials are not stable under UV light irradiation so that they are difficult to recover and reuse. Here, a kind of N-halamine-immobilized Fe3O4@SiO2@TiO2(F@S@T-Cl) nanoparticles were prepared. In addition, the UV stability and regeneration capacity were also studied after variable time exposure to UV light. The results showed that nanoparticles have great antibacterial properties against Staphylococcus aureus and Escherichia coli. Meanwhile, the N–Cl bond in the nanocomposite showed outstanding storage stability under UV light irradiation and good regeneration ability; the material can realize cyclic utilization and solve the problem of secondary pollution of the antibacterial material. It provides a broader application prospect for the recyclable N-halamine antibacterial material.
研究领域:
材料科学
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生物学
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
·
2019
·
IF 1.398
Ling Li,Hui Ji
The present study investigated the protective effects of the polyphenol epicatechin on the protein structural changes, gel properties and N-nitrosodiethylamine (NDEA) formation of oxidatively stressed myofibrillar protein (MP). Results showed that oxidation treatments to MP significantly increased their carbonyl content and surface hydrophobicity as compared to the control groups (p < 0.05). Epicatechin inhibited protein carbonyl content and surface hydrophobicity, especially treated with 2 mM epicatechin. Under oxidative conditions, the fluorescence intensity of tryptophan gradually decreased with the increase of epicatechin concentrations from 0 to 2 mM. The storage modulus (G’) was increased gradually after oxidation and epicatechin treatment. Epicatechin reduced the loss of P22 and water holding capacity (WHC), promoted the hydration of the proteins. Under oxidative conditions, epicatechin had a concentration dependent effect on the formation of NDEA; low concentrations of epicatechin promoted NDEA formation, while high concentrations inhibited NDEA production. In conclusion, an appropriate quantity of polyphenols can inhibit the oxidation of MP and formation of N-nitrosamines.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Shiying Lin,Lanlan Mo,Feijun Wang,Ziqiang Shao
Heteroatom doping is a significant modification of carbon materials for electrodes in storage device and co-doping has synergistic improvement effect. This work reports a N/O co-doped porous carbon (CPK800) from crosslinking sodium carboxymethyl cellulose and poly (m-phenylene diamine). The material characterization reveals its large specific surface area of 1501.3 m 2 g −1 with optimum micro- and mesopore distribution, partially graphitized carbon and high N, O concentration. This carbon has 3D interconnected porous structure and internal conducting network providing rapid ion and electron transportation. Take these advantages, it exhibits high capacitance of 358 F/g at 1 A g −1 , an excellent rate retention of 70.8% at a high current density of 20 A g −1 , and superior cyclic stability of 97.8% capacitance retention after 10,000 cycles at 10 A g −1 as an electrode material in 3 M KOH electrolyte. Moreover, the assembled symmetric supercapacitor device (CPK800//CPK800) delivers a high energy density of 11.5 Wh kg −1 at a power density of 326.8 W kg −1 and still have energy density of 8.9 Wh kg −1 at a very high power density of 6.8 kW kg −1 . The well-developed structure and outstanding electrochemical performance demonstrate the promising potential of CPK800 as electrode material for advanced energy storage devices.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Tao Jiang,Ling Cheng,Yingchun Han,Jun Feng,Jingdong Zhang
A p-n heterojunction film of Bi 2 O 3 -WO 3 with enhanced photoelectrocatalytic (PEC) activity was successfully constructed by a facile one-pot hydrothermal synthesis. The as-prepared Bi 2 O 3 -WO 3 heterojunction film exhibited flower-like microstructures. Compared with pristine Bi 2 O 3 and WO 3 films, the Bi 2 O 3 -WO 3 composite film exhibited enhanced absorption in the visible region. The formation of Bi 2 O 3 -WO 3 p-n heterojunction facilitates the interfacial transfer of electrons as well as the separation of charge carries. As a result, the Bi 2 O 3 -WO 3 film showed high photocurrent response under visible light illumination. Furthermore, the enhanced visible light PEC performance of Bi 2 O 3 -WO 3 film was evaluated by the decoloration of Rhodamine B. When the Bi 2 O 3 -WO 3 film was applied to norfloxacin removal, the degradation efficiency reached 88.4% after 6 h PEC process under visible light illumination. According to nine intermediates identified by liquid chromatograph-mass spectrometric analysis, a possible PEC degradation mechanism for norfloxacin was proposed.
研究领域:
材料科学
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环境科学
·
光催化
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Weiwei Guo,Yuting Shuai,Xuecheng Liu,Jie Zhang,Jiang Wang,Khaled H. Mahmoud,Zeinhom M. El-Bahy,N.M. Mubarak
N-butanol, a poisonous and flammable liquid, has great threat to human life and property security, which is of importance to monitor n-butanol in the environment. In this paper, the pure and Co-doped BiVO 4 polyhedrons are successfully synthesized by hydrothermal method . A series of characterizations, such as XRD , XPS, SEM, UV, and EIS, etc., are used to analyze the crystal structure, morphology, element compositions , optical and electrochemical properties of the as-prepared samples. The optimal sample (3Co-BiVO 4 ) exhibits high gas response (51.65) toward 100 ppm n-butanol, which is around four times higher than that of pure BiVO 4 at 300 °C. In addition, the 3Co-BiVO 4 also has fast response-recovery time, good humidity resistance, favorable selectivity to n-butanol, etc. Based on the above characterizations and gas sensing test results, the enhanced gas sensing mechanism for 3Co-BiVO 4 is proposed. This work provides a feasible strategy to fabricate BiVO 4 polyhedron by doping Co to greatly enhance the gas sensing properties for n-butanol.
研究领域:
材料科学
·
环境监测
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DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 8
·2951-2960
·
IF 5.231
Minghui He,Guangxue Chen,Xun Huang,Ruixin Xu,Zhaohua Zeng,Jianwen Yang
N-Phthaloyltranexamic acid ammonium salt derivatives integrating with peroxides can invoke redox photopolymerization and propagating polymerization. A series of N-phthaloyltranexamic acid ammonium salt derivatives based on benzophenone, thioxanthen, and naphtha chromophores as novel photocaged bases were synthesized and characterized. In combination with a benzoyl peroxide initiator, these structures were able to initiate the amine-mediated redox photopolymerization of acrylates. In particular, the covalent binding of N-phthalimidoamino acid and type II chromophores (thioxanthone, benzophenone) improved remarkably the photoreactivity of photocaged bases (thioxanthen-DBU and benzophenone-DBU) compared to the parent compound. Furthermore, naphthal-DBU matches well the emission spectra of the mercury lamp with a dominant emission wavelength at 365 nm. More importantly, phthal-DBU & BPO as a new photocaged redox combination can invoke controlled redox polymerization within an irradiation time of 3 min. Finally, due to the persistent interaction of the produced longeval amine with peroxides, remarkable post conversion after irradiation, which is significant for preparation of photo-screened materials, was thus initially achieved in the redox photopolymerization.
研究领域:
材料化学
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高分子科学
·
有机化学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 4
·655
·
IF 5.719
Wenjing Yu,Bo Liu,Xiaojiao Zhao
To develop high-performance microwave absorption materials with the features of lightweight, thin thickness, broad bandwidth, and strong absorption, an ultralight Ni3S2@N, S-codoped graphene aerogel with a density of 13.5 mg/cm3has been fabricated by the use of metal-organic frameworks (MOFs) to directly initiate the gelation of graphene oxide strategy. In such a strategy, dual-functional 1D Ni-MOF nanorods not only act as the gelation agent but also afford the doping elements (N and S) originated from the organic species and the precursor for metal sulfide. Due to the synergistic effects of good impedance matching and multiple losses, the optimal reflection loss (RL) of as-prepared Ni3S2@N, S-codoped graphene aerogel reaches −46.9 dB at 17.1 GHz with only 2.0 mm and ultralow filling content (1.75 wt%). The maximum effective absorption bandwidth (EAB) reaches 6.3 GHz (11.7–18.0 GHz) at 2.38 mm, covering the whole Ku band. Moreover, the value of EAB with the RL less than −30 dB can be tuned to 12.2 GHz (5.8–18 GHz) at the absorber thickness ranging from 1.9 to 5.0 mm. This work provides insight for rational design and fabrication of multicomponent-containing graphene aerogels, showing the potential application in lightweight and high-performance microwave absorption.
研究领域:
材料科学
·
电磁学
·
化学工程
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Fang Wang,Zhe Chen,Zhenzhou Zhu,Jia Guo
Antibiotics in pharmaceutical and aquaculture wastewater is a growing threat to the environment of world, due to the induction of drug-resistant bacteria and the harm to the aquatic organisms. Photocatalytic membrane, which has immobilized photocatalyst on membrane is an effective and environmentally friendly technology for antibiotics degradation. In this study, a novel photocatalytic membrane was prepared by loading ZnO/N-g-C 3 N 4 composite on commercial polymer membrane with glutaraldehyde as a crosslinker through pressure driven filtration. The loading of the photocatalyst over the membranes was validated by Fourier transform infrared spectroscopy, scanning electron microscope and X-ray photoelectron spectroscopy. The photocatalytic properties of ZnO/N-g-C 3 N 4 composite membrane were observed efficient for degradation of tetracycline, ciprofloxacin and ofloxacin in both immersion and filtration model under visible light (λ > 420 nm). Especially, a ZnO/N-g-C 3 N 4 loading amount of 1.12 g/cm 2 and glutaraldehyde concentration of 45% led to the degradation rate of 100% and 80% for tetracycline at 5 mg/L and 10 mg/L, respectively. Low trans-membrane pressure (0.005 MPa) and narrow membrane size (50 kDa) were favorable for antibiotics degradation in filtration model due to long reaction time on membrane surface. Construction and performance of ZnO/N-g-C 3 N 4 composite membrane might provide new strategy for energy saving wastewater treatment.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Materials Reports: Energy
·
2025
·
IF 13.8
Wei Fang,Zeping Ou,Yifan Wang,Xiaoxue Lin,Hao Yang,Yujie Zheng,Jing Li,Lei Wang,Lijun Hu,Chen Li,Jianyong Ouyang,Kuan Sun
Thermocells are attracting growing interest as a promising thermoelectric technology for low-grade heat harvesting. However, the scarcity of high-performance redox couples featuring intrinsically high thermopower ( S e ) and fast redox kinetics hinders thermocells rapid development. Identifying potential intrinsically high-performance redox couples remains a significant challenge. This work introduces a novel n-type copper (Ⅰ/Ⅱ) chloride (CuCl/CuCl 2 ) redox couple with intrinsically high performance. Through tailored electrolyte design, long-term stability was significantly improved by reducing proton concentration to suppress cuprous ion photo-oxidation, while ammonium chloride solvation enhanced cuprous ion solubility. The resulting system achieves a S e value closely aligned with theoretical predictions and exhibits rapid redox kinetics. Consequently, the optimized CuCl/CuCl 2 intrinsic system demonstrated a high S e of 1.52 mV K ‒1 and a record-high normalized power density P max (Δ T ) ‒2 of 0.399 mW m ‒2 K ‒2 , surpassing previously reported intrinsic n-type thermocells and rivaling the performance of p-type pristine 0.4 M ferri/ferrocyanide systems. A prototype module comprising 30 p-n units successfully powered a line of light-emitting diodes or a thermohygrometer. This work introduces a valuable redox couple for further advancing high-performance thermocells and demonstrates a viable strategy for developing novel redox systems.
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 6
·976
·
IF 5.719
Haiyan Qi,Qiuying Li,Jing Jing,Tao Jing,Chuntong Liu,Lixin Qiu,Rokayya Sami,Mahmoud Helal,Khadiga Ahmed Ismail,Amani H. Aljahani
In our study, a unique ratiometric fluorescent sensor for the rapid detection of arginine (Arg) and acetaminophen (AP) was constructed by the integration of blue fluorescent N-CDs and yellowish-green fluorescent calcein. The N-CD/calcein ratiometric fluorescent sensor exhibited dual emission at 435 and 519 nm under the same excitation wavelength of 370 nm, and caused potential Förster resonance energy transfer (FRET) from N-CDs to calcein. When detecting Arg, the blue fluorescence from the N-CDs of the N-CD/calcein sensor was quenched by the interaction of N-CDs and Arg. Then, the fluorescence of our sensor was recovered with the addition of AP, possibly due to the stronger association between AP and Arg, leading to the dissociation of Arg from N-CDs. Meanwhile, we observed an obvious fluorescence change from blue to green, then back to blue, when Arg and AP were added, exhibiting the “on–off–on” pattern. Next, we determined the detection limits of the N-CD/calcein sensor to Arg and AP, which were as low as 0.08 μM and 0.02 μM, respectively. Furthermore, we discovered that the fluorescence changes of the N-CD/calcein sensor were only responsible for Arg and AP. These results suggested its high sensitivity and specificity for Arg and AP detection. In addition, we have successfully achieved its application in bovine serum samples, indicating its practicality. Lastly, the logic gate was generated by the N-CD/calcein sensor and presented its good reversibility. Overall, we have demonstrated that our N-CD/calcein sensor is a powerful sensor to detect Arg and AP and that it has potential applications in biological analysis and imaging.
研究领域:
生物化学
·
分析化学
·
医学检测
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DOI
高影响因子
危险品化学品经营许可证（带存储）