Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 26
·13095-13105
·
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.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weiying Zhou,Fuwang Mo,Zishan Sun,Jiabao Luo,Jiaqi Fan,Hongni Zhu,Zhenpeng Zhu,Jinqing Huang,Xinguo Zhang
Carbon dots (CDs) with long-wavelength-emission and high quantum yield (QY) are the focus of current research, compared with widely-investigated blue-emitting CDs. Herein, bright red-emitting CDs were synthesized by hydrothermal reaction at 200 °C for 3 h. CDs prepared by p-Phenylenediamine (pPD) exhibits a weak red band at 635 nm under an excitation wavelength of 450 nm. Adding (NH 4 ) 2 HPO 4 and KBr as P and Br precursors, the red emission peak at 610 nm, which shows a peak blue-shift about 25 nm with a dramatic emission enhancement up to 20-folds by co-doping of P, Br atoms into CDs. The corresponding QY value of P, Br-doped CDs (P, Br-CDs) was greatly improved to 11.3% as compared to bare CDs’ (0.55%). Furthermore, P, Br-CDs show a remarkable luminescent turn-off response after adding copper ions (Cu 2+ ). In addition, the quenched luminescence of P, Br-CDs/Cu 2+ complex could be recovered by the chelation between Cu 2+ and L -cysteine ( L -Cys) after adding L -Cys. This fluorescence “ON-OFF-ON” protocol could be applied for sequent Cu 2+ and L -Cys detection, and offer a linear range of 0–150 μM and 0–100 μM with a limit of detection of 4.408 µM and 2.373 µM for Cu 2+ and L -Cys, respectively. All results indicate that P, Br-CDs are of great potential for further biological and environmental application.
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Materials Today Bio
·
2022
·
IF 10.761
Lei Han,Xianzhen Dong,Tong Qiu,Zhaona Dou,Lin Wu,Honglian Dai
Wallerian degeneration after peripheral nerve injury (PNI), that is, the autonomous degeneration of distal axons, leads to an imbalance of iron homeostasis and easily induces oxidative stress caused by iron overload. Inspired by the process of nerve degeneration and regeneration, the design of a functional electrospinning scaffold with iron chelating ability exhibited the importance of reconstructing a suitable microenvironment. Here, an electrospinning scaffold based on deferoxamine and poly(3(S)-methyl-morpholine-2,5-dione -co- lactone) (PDPLA/DFO) was constructed. This work aims to explore the promotion of nerve regeneration by the physiological regulation of the scaffold. In vitro , PDPLA/DFO films mitigated the reduction of glutathione and the inactivation of Glutathione peroxidase 4 caused by iron overload. In addition, they decreased reactive oxygen species, relieve the stress of the endoplasmic reticulum and mitochondria, and reduce cell apoptosis. In vivo , PDPLA/DFO conduits constructed the anti-inflammatory microenvironment and promoted cell survival by alleviating iron overload and organelle stress. In conclusion, PDPLA/DFO guidance conduits targeted the distal iron overload and promoted nerve regeneration. It provides novel ideas for designing nerve conduits targeting the distal microenvironment.
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Materials Today Chemistry
·
2023
·
IF 7.3
L. Liu,J. Su,X. Zhou,D. Liang,Y. Liu,R. Tang,Y. Xu,Y. Jiang,Z. Wei
Presently, the low ionic conductivity of Na super ionic conductor (NASICON) electrolytes is one of the main obstacles to the development of solid-state sodium batteries . Most researchers focus on the modified NASICON by doping with foreign elements and have not paid much attention to the effect of the composition changing by adjusting the ratio of elements in Na 1+x Zr 2 Si x P 3-x O 12 (0 ≤ x ≤ 3) on the ionic conductivity . In order to clarify the relationship between the ionic conductivity and the structure/composition of Na 1+x Zr 2 Si x P 3-x O 12 , the ionic conductivity dependence on the Si/P ratio is systematically investigated in this study. The obtained results demonstrate that the ionic conductivity variation of NASICON is close to an order of magnitude i.e. the ionic conductivity of Na 1+x Zr 2 Si x P 3-x O 12 is much more sensitive to the Si/P ratio in the structure. This means that it is crucial to control the composition during the preparation process to obtain the electrolyte with high ionic conductivity. The strong composition-dependent property of Na 1+x Zr 2 Si x P 3-x O 12 can be attributed to the change of current carrier concentration, crystal structure, and sintering property resulting from the Si/P ratio. The results are insightful for further understanding the conducting characteristics of Na 1+x Zr 2 Si x P 3-x O 12 material and its derivatives.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Shenghua Yang,Jinming Guo,Hongyu Yuan,Haixia Xiao,Xiaming Feng,Hongyu Yang,Cheng Yan,Wei Cai
Intumescent flame-retardant (IFR) systems are attractive alternatives to conventional halogenated flame retardants due to their halogen-free composition, efficiently reduced heat release, and low toxicity generation. Herein, a nitrogen–boron (N B) dual-element flame retardant, melamine borate (MB), was synthesized and subsequently incorporated into a UV-curable resin based on bis(2-methacryloxyethyl) phosphate to construct a ternary synergistic N/P/B IFR coating system. The structure, thermal stability, and flame-retardant properties of the resulting coatings were systematically investigated by various techniques and combustion tests. Increasing MB content raised the glass transition temperature (T g ), indicating enhanced network compactness and stability. The coating containing only 4 wt% MB achieved a UL-94 V -0 rating and exhibited a 56.35 % reduction in total smoke production (TSP), along with significantly improved thermal stability in terms of decomposition temperature and char residue. The synergistic contributions of phosphorus, nitrogen, and boron promote catalytic charring, gas release, and glass-phase reinforcement, leading to the formation of a dense, stable char barrier. This eco-friendly ternary IFR system overcomes the high loading requirements and toxicity concerns of conventional flame retardants, providing a promising strategy for the efficient and sustainable flame-retardant modification of polymeric coatings.
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Baoxian Wang,Saiying Li,Zhiwei Wang,Zhenyu Zhou,Lizi Li,Shufang Wu,Weiqi Wei
Developing an efficient and feasible pretreatment is vital for biomass refining. Herein, a kind of p-toluene sulfonic acid (p-TsOH) pretreatment under mild conditions was proposed to convert the sugarcane bagasse (SCB) into glucose, furfural, and activated lignin. After the pretreatment, the cellulose-rich solid was digested by cellulase, and the glucose yield was up to 94.8 %. The pretreated liquid was diluted with deionized water to precipitate the lignin. Notably, the hemicelluloses degradation products in the supernatant, primarily xylose, can be directly converted into furfural without needing a catalyst, achieving a yield of 73.1 %. The recovered lignin exhibits excellent antioxidant properties, with a radical scavenging index (RSI) of 40.0 and significant UV absorbance, which displayed great potential in lignin-based sunscreen preparation. This study, therefore, presents a comprehensive strategy for the valorization of SCB, enhancing its potential for sustainable applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Ke Wang,Yuqing Huang,Shiyong Sun,Haoming Tang,Lin Gong,Dongdong Wang,Xueyan Zhang,Sen Lin
The detoxification and valorization of toxic p-nitrophenol (p-NP) and its ester derivatives into high-value p-aminophenol (p-AP) present a significant challenge in green chemistry. This work addresses this challenge by developing a hybrid catalyst through the co-immobilization of lipase and a novel bimetallic Cu/Mn aminoclay nanozyme (CMAC) onto montmorillonite (Mt). The key innovation lies in the multifunctional design of CMAC, which serves not only as a highly active laccase-mimicking nanozyme but also as an intrinsic immobilization matrix for lipase, while the Mt support simultaneously prevents nanozyme aggregation and enhances structural stability. This integrated lipase-CMAC@Mt. platform enables efficient substrate channeling, whereby the p-NP intermediate generated from lipase-catalyzed hydrolysis of p-NPP is directly reduced by adjacent CMAC to p-AP, minimizing intermediate accumulation and overcoming diffusion limitations. As a result, the hybrid catalyst achieves efficient one-pot conversion of p-NPP to p-AP, without requiring harsh reagents or intermediate separation. Remarkably, it exhibits exceptional reusability (76.8 % activity retention after 10 cycles) and storage stability (82.4 % activity retained over 30 days), substantially outperforming conventional free enzyme systems. This study demonstrates a strategic bio-nano synergy that combines the specificity of enzymes with the robustness of nanozymes, offering a scalable and economically viable platform for simultaneous toxic waste elimination and resource recovery.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Dan Han,Mingyan Zhang,Haochen Zhang,Yongyi Zhang,Jinping Wang,Rui Yang,Chunling Zuo,Xiaoshuang Chen
Electrolysis of water is an environmental protection technology to generate hydrogen and alleviate energy depletion problem. In this paper, the hierarchical tremella flower composite was fabricated by nickel‑iron layered double hydroxide (NiFeLDH) and nonmetallic phosphorus-doped cobalt molybdenum oxide (P-CMO). A good deal of uniform nanosheets with the thickness of ∼48 nm constitute three-dimensional (3D) flower architecture. Compared with NiFeLDH and P-CMO, the P-CMO/NiFeLDH exhibits excellently electrocatalytic activity in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), achieving the overpotentials (ƞ 10 ) of 254.9 mV and 96.3 mV as well as the Tafel slopes of 35.5 mV dec −1 and 79.2 mV dec −1 , respectively. Furthermore, it requires a cell voltage of 1.43 V to reach a current density of 10 mA cm −2 in an electrolyzer consisting of P-CMO/NiFeLDH as both anode and cathode. The characterizations and density functional theory (DFT) calculations demonstrate that the interfacial synergism of P-CMO/NiFeLDH can induce the electron redistribution by charge transfer from NiFeLDH to P-CMO, augment the generation of high valence nickel, decrease the reaction energy barrier and enhance the reaction kinetics. This work declares that the layered double hydroxide integrated with heteroatom-substitutional transition metal oxide furnishes an affordable route for devising efficient electrocatalysts in water-splitting application.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2014
·
IF 3.679
Sheng-Jie Chen,Yong-Qi Li,Yong-Yong Wang,Xiao-Li Zhao,Ye Liu
The ionic hybrid P,N-ligands of 1 and 2 have been synthesized as one type of unconventional tertiary phosphines with the advantages of both the π-accepting ligands and the hemilabile ligands. The corresponding ionic Rh(I)-complexes of 1A and 2A proved to be more efficient catalysts for hydroformylation of 1-octene over isomerization than the traditional Rh I (acac)(CO)(PPh 3 ), due to the π-backdonation interaction in Rh → P linkage and the hemilabile ligation of N,P-coordinating sites to Rh-center. The in situ high-pressure FT-IR analysis indicated that: (1) the formation and lifetime of the active Rh H species (2047 cm −1 ) derived from 1A are facilitated by the presence of ligand 1 ; (2) the formation of the active Rh H species is depressed without the aid of the P,N-hemilabile ligation; and (3) the active Rh H species derived from Rh I (acac)(CO)(PPh 3 ) is unstable and susceptible to the formation of the inactive carbonyl-bridged Rh-dimer.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 7
·3879-3886
·
IF 1.093
Liu Baoliang,Yang Bing,Sun Meiyu,Qian Xiangli,Zhang Qikun
In this study, a Pt loaded active carbon fiber (Pt/ACF) catalyst was prepared by immobilizing Pt nanoparticles on ACF. The catalyst accelerated hydrogenation of p-chloronitrobenzene (p-CNB) to p-chloroaniline (p-CA) at lower temperature and atmospheric pressure,
resulting in approximately 100% yield and selectivity. Several factors that affect p-CA yield were investigated. The nitro reduction rate reached 100% under the optimal reaction conditions, indicating excellent selectivity of the prepared catalyst. This process will overcome the environmental
pollution problems associated with the traditional process, and is a green synthetic process.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 30
·10257-10265
·
IF 7.059
Liang Sun,Zhicheng Shi,Liang Liang,Shuang Wei,Huanlei Wang,Davoud Dastan,Kai Sun,Runhua Fan
Polymer dielectric composites are of considerable interest for film capacitors that are widely used in modern electric devices and electric power systems. However, the adverse coupling between dielectric permittivity (εr) and breakdown strength (Eb) makes it difficult to obtain high energy densities in natural materials. With the aim of achieving concurrently improved εr and Eb, a class of rationally designed layer-structured composites consisting of pure poly(vinylidene fluoride–hexafluoropropylene) (P(VDF–HFP)) layers and barium titanate/P(VDF–HFP) (BT/P(VDF–HFP)) composite layers were prepared. Interestingly, the layer-structured composites exhibit a concurrent improvement of εr and Eb. The 4-layer composite with 15 vol% BT exhibits substantially enhanced εr and Eb which are nearly ∼186% and ∼248% of those for its 1-layer counterpart, respectively. Consequently, a high energy density of ∼4 J cm−3 along with a satisfactory efficiency of 71% at 240 kV mm−1 is achieved. Meanwhile, a low loss tangent of ∼0.05 at 10 kHz which is comparable to that of pure P(VDF–HFP) is maintained. This work shows that the adverse coupling between εr and Eb in dielectric materials could be well addressed by constructing nanocomposites with layered rather than random distribution of fillers.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiangping Jing,Zhuoyuan Chen,Chang Feng,Mengmeng Sun,Jian Hou
Photoelectrochemical cathodic protection is emerging as a green and environmental method to protect metals against corrosion. Graphitic carbon nitride (g-C 3 N 4 ) shows great application potential in this area because of its high efficiency, high stability and low cost. However, the pristine g-C 3 N 4 shows amphoteric properties, resulting in its failure in providing photoelectrochemical cathodic protection for the coupled metal in NaCl solution. In this work, a K&I co-doping technique was performed to modulate the band structure of g-C 3 N 4 , and an n-type g-C 3 N 4 (n-C 3 N 4 ) was obtained. The changes in the molecular structure were studied by SEM, HRTEM , XRD , EDS, XPS and FT-IR technologies. The n-type semiconductor characteristics were verified by the photoinduced i-V curves, SKP potential distributions and pH drift techniques. The n-C 3 N 4 can generate positive photocurrent in the whole investigated potential range, making it able to provide photoelectrochemical cathodic protection for the coupled 316L stainless steel in NaCl solution. This work is very helpful for promoting the application of g-C 3 N 4 in the fields of the photoelectric conversion and the photoelectrochemical cathodic protection.
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