ACS Applied Energy Materials
·
2021
·
IF 6.024
Caihong Xue,Dandan Jin,Hui Nan,Haomin Wei,Huiyuan Chen,Chao Zhang,Shiai Xu
Poly(vinylidene fluoride) (PVDF) gel polymer electrolytes (GPEs) show great potential for application in lithium-ion batteries (LIBs) due to their outstanding characteristics. However, the inferior thermal stability and low ionic conductivity limit their practical application. Herein, γ-LiAlO2 was synthesized and applied in a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)-polybenzimidazole containing an ether bond (OPBI)-polyoxyethylene (PEO) (PHOP-LAO) GPE for improving its thermal stability and ionic conductivity properties. The ionic conductivity of PHOP-LAO is 4.83 mS cm–1, which increased by 210% compared with that of the PHOP sample. It is worth noting that the thermal shrinkage of the PHOP-LAO membrane is greatly reduced (less than 1% at 230 °C for 1 h). PHOP-LAO shows outstanding thermal stability, which is beneficial for the safety of LIBs. When the PHOP-LAO GPE was applied to LIBs with Li1.04Ni1/3Co1/3Mn1/3O2 as a cathode, the LIBs exhibit remarkable and stable cycling performance with a discharge capacity retention rate of 85% after 500 cycles at a 2 C rate and maintain a power capability retention rate of up to 77% of the initial capability at the high rate of 10 C (50 °C). PHOP-LAO thus shows great potential for achieving ultra-stable and safe LIBs in the future.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2021
·Vol. 14
·期 15
·4520
·
IF 3.004
Xiaokang Yang,Jiaqi Sun,Guang Jiang,Shucheng Sun,Zhigang Shao,Hongmei Yu,Fangwei Duan,Yingxuan Yang
Membrane water content is of vital importance to the freezing durability of proton exchange membrane fuel cells (PEMFCs). Excessive water freezing could cause irreversible degradation to the cell components and deteriorate the cell performance and lifetime. However, there are few studies on the critical membrane water content, a threshold beyond which freezing damage occurs, for cold storage of PEMFCs. In this work, we first proposed a method for measuring membrane water content using membrane resistance extracted from measured high frequency resistance (HFR) based on the finding that the non-membrane resistance part of the measured HFR is constant within the range of membrane water content of 2.98 to 14.0. Then, freeze/thaw cycles were performed from −50 °C to 30 °C with well controlled membrane water content. After 30 cycles, cells with a membrane water content of 8.2 and 7.7 exhibited no performance degradation, while those higher than 8.2 showed significant performance decay. Electrochemical tests revealed that electrochemical surface area (ECSA) reduction and charge transfer resistance increase are the main reasons for the degradation. These results indicate that the critical membrane water content for successful cold storage at −50 °C is 8.2.Keywords:freezing durability;cold start;membrane water content;performance degradation;proton exchange membrane fuel cell
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Xiang Wan,Kai Shi,Huan Li,Fangxie Shen,Shan Gao,Xiangmei Duan,Shen Zhang,Chunning Zhao,Meng Yu,Ruiting Hao,Weifang Li,Gen Wang,Maria Peressi,Yinchang Feng,Weichao Wang
Catalytic decomposition of aromatic polluters at room temperature represents a green route for air purification but is currently challenged by the difficulty of generating reactive oxygen species (ROS) on catalysts. Herein, we develop a mullite catalyst YMn2O5 (YMO) with dual active sites of Mn3+ and Mn4+ and use ozone to produce a highly reactive O* upon YMO. Such a strong oxidant species on YMO shows complete removal of benzene from −20 to >50 °C with a high COx selectivity (>90%) through the generated reactive species O* on the catalyst surface (60 000 mL g–1 h–1). Although the accumulation of water and intermediates gradually lowers the reaction rate after 8 h at 25 °C, a simple treatment by ozone purging or drying in the ambient environment regenerates the catalyst. Importantly, when the temperature increases to 50 °C, the catalytic performance remains 100% conversion without any degradation for 30 h. Experiments and theoretical calculations show that such a superior performance stems from the unique coordination environment, which ensures high generation of ROS and adsorption of aromatics. Mullite’s catalytic ozonation degradation of total volatile organic compounds (TVOC) is applied in a home-developed air cleaner, resulting in high efficiency of benzene removal. This work provides insights into the design of catalysts to decompose highly stable organic polluters.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 27
·2201679
·
IF 17.521
Weigang Sun,Zhen Xu,Congde Qiao,Bingxi Lv,Ligang Gai,Xingxiang Ji,Haihui Jiang,Libin Liu
Hydrogel electrolyte is widely used in solid energy storage devices because of its high ionic conductivity, environmental friendliness, and non-leakage property. However, hydrogel electrolyte is not resistant to freezing. Here, a high proton conductive zwitterionic hydrogel electrolyte with super conductivity of 1.51 mS cm –1 at −50 °C is fabricated by random copolymerization of acrylamide and zwitterionic monomer in the presence of 1 m H 2 SO 4 and ethylene glycol (EG). The antifreezing performance and low temperature conductivity are ascribed to hydrogen bonds and ionic bonds between the components and water molecules in the system and can be tuned by changing the monomer ratio and EG contents. The proton hopping migration on the ionic group of the polymer chains and Grotthuss proton transport mechanism are responsible for the high proton conductivity while Grotthuss transport is dominated at the glassy state of the polymer chains. The electrolyte-assembled supercapacitor (SC) offers high specific capacitance of 93.5 F g –1 at 25 °C and 62.0 F g –1 at −50 °C with a capacitance retention of 91.1% and 81.5% after 10 000 cycles, respectively. The SC can even work at −70 °C. The electrolyte outperforms most reported antifreezing hydrogel electrolytes and has high potential in low-temperature devices.
研究领域:
材料科学
·
电化学
·
能量存储
·
聚合物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2023
·
IF 18.9
Chunlin Xie,Shengfang Liu,Hao Wu,Qi Zhang,Chao Hu,Zefang Yang,Huanhuan Li,Yougen Tang,Haiyan Wang
The development of electrolytes with a wide temperature range, no dendrite growth and corrosion resistance is essential for the practical application of aqueous zinc metal batteries . Herein, γ-valerolactone is developed as the co-solvent to extend the operating temperature range of the aqueous electrolyte and stabilize the zinc metal anode interface. This weak solvent acts as a strong hydrogen bonding ligand and “diluent” to break the hydrogen bonds between free water molecules, thus enhancing the temperature tolerance and chemical stability of the electrolyte. The γ-valerolactone can also be adsorbed on the anode surface to achieve a dendrite-free zinc deposition behavior by promoting zinc nucleation and regulating zinc growth texture. The optimized electrolyte enables the symmetric cell to deliver a cycle/rest life of 2160 h and operate stably over a wide temperature range of −50 to 80 °C. The corresponding Zn||AC and Zn||PANI cells exhibit capacity retention of 92.5% and 85% after 8100 and 1600 cycles, respectively. This mechanism of weak solvent-regulated hydrogen bonding and solvent sheath provides new insights into the design of advanced aqueous electrolytes.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Zi-jun Tang,Ya-ling An,Fei Huang,Yu-shi Huang,Chun-qian Song,Wen-jie Zhao,Xiao-kang Liu,Zhen-wei Li,Lin Feng,Ling Fang,Kang-nan Liu,Dai-di Zhang,Yang Yang,De-an Guo
Seed-derived medicinal herbs (SDMHs) are rich in lipid components widely applied in food fields, contributing to flavor modulation and lipid metabolism regulation. However, their highly similar morphological features often lead to adulteration and misidentification. In this study, 608 batches from 50 SDMH species were analyzed using high-performance liquid chromatography coupled with evaporative light-scattering detection, which effectively separated fatty acids, phospholipids, and triacylglycerols within 60 min and enabled the construction of a comprehensive lipid fingerprint database. Seven machine learning and one deep learning models were compared, among which a one-dimensional convolutional neural network demonstrated superior performance, achieving 100 % accuracy on the training set and 98.4 % on the test set. Based on this model, an interactive identification platform was developed, integrating herb images, major lipid components, chromatographic fingerprints, and botanical information. The platform enables rapid and accurate authentication of SDMHs and makes it user-friendly to non-specialist users. This study presents a scalable lipid profiling strategy and an intelligent tool for SDMH quality control and authentication.
研究领域:
药用植物学
·
分析化学
·
计算生物学
·
食品科学
·
代谢组学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Yunjing Cao,Nan Li,Kai Yuan,Na Li,Wujiu Zhang,Shiyu Liang,Zhidong Hou,Da Lei,Ting Jin,Jian-Gan Wang,Keyu Xie,Chao Shen
Ni-rich (Ni≥0.8) LiNi x Co y Mn 1− x −y O 2 (NCM) cathode materials have attracted great interest for high-energy-density lithium ion batteries (LIBs). However, layered oxides of Ni-rich CAMs are suffering from the notorious structural and interfacial degradation in the liquid electrolyte , especially at high state-of-charge (voltage) and temperature, which leads to electrochemical performance deterioration and thermal runaway of the cell. This work systematically and comprehensively reveals the underlying mechanism of the electrolyte additive phenyl trifluoromethyl sulfide (PTS) to enhance the electrochemical property of Ni-rich layered oxides at high voltage (∼4.6 V) and high-temperature (∼50 °C). Specifically, PTS observably encourages the electrode stability via cathode-electrolyte interface strengthening and reactive oxygen species deactivating mechanism, which facilitates the NCM811 cathode to adapt to the deep charging state as well as the highly oxidized environment. The binding energy calculation results reveal that the superoxide radical could steadily adsorb on the S radical or Li + sites by interacting with Li + , thus making the superoxide radical deactivated. With the interface strengthening of PTS, the Ah-level NCM811||Gr pouch cell exhibits excellent cycling stability. This work affords a guide to designing electrolytes for Ni-rich LIBs towards high-voltage and high-temperature.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
·
界面化学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Jian Zhang,Minxia Kang,Yihong Zhou,Changpo Ma,Feng Ning,Zumin Qiu
In this study, a simple method was introduced to synthesize polyethyleneimine modified magnetic graphite (Fe 3 O 4 @GR-PEI( 50 )), which was used to adsorb humic acid (HA) from aqueous solution. The obtained materials were characterized by field emission scanning electron microscope , X-Ray diffraction, Fourier transform-infrared, and thermogravimetric analysis . The results showed that Fe 3 O 4 @GR-PEI( 50 ) was synthesized successfully and PEI uniformly covered on Fe 3 O 4 @GR-PEI( 50 ) surface. The adsorption performance was evaluated at different concentration, temperature, pH, and cationic concentration. The maximum adsorption capacity of Fe 3 O 4 @GR-PEI( 50 ) was 49.87 mg/g at 293 ± 1 K and it was greatly affected by the solution pH and the additional cations. This is mainly due to the strong electrostatic interactions between the negatively charged HA molecules and the positively charged adsorbents. The adsorption kinetics were examined using pseudo-first-order, pseudo-second-order and intra-particle diffusion model. The equilibrium adsorption data were analyzed by Langmuir and Freundlich models. The results revealed that the pseudo-second-order model and Freundlich isotherm fit the kinetics and equilibrium data, respectively. Furthermore, Fe 3 O 4 @GR-PEI( 50 ) exhibited a good performance of regeneration and reuse, which maintained a high adsorption capacity after six consecutive times of regeneration.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yingying Zhang,Shuai Dong,Chong Wan,Yuqi Zhu,Suhang Chen,Fengqi Zhao,Kangzhen Xu
Ammonium perchlorate (AP), cyclotrimethylenetrinitramine (RDX) and 1,1’-dihydroxy-5,5’-ditetrazolium dihydroxyl ammonium (TKX-50) play a vital role in aerospace and military applications. However, improving their thermal decomposition performance remains a critical technical bottleneck. In this study, CuBi 2 O 4 (CBO) was selected as combustion catalyst due to its superior thermal stability and structural tunability, and Fe doping strategy was introduced to modulate its electronic band structure. The effective incorporation of Fe in CBO not only induces lattice distortion, but also stabilizes the thermodynamic nonequilibrium state, thereby reducing the energy barrier for electron transfer and effectively suppressing carrier recombination. Fe-CBO exhibits narrow band gap (1.73 eV), excellent electron transport properties and abundant active sites, which can significantly improve catalytic performance. Systematic optimization of Fe-doping contents reveals that 15 %Fe-CBO has optimal catalytic performance, reducing thermal decomposition peak temperatures of AP, RDX, and TKX-50 by 76.3, 5.7 and 36.3 °C respectively, while lowering apparent activation energies to 125.26, 182.34 and 164.60 kJ·mol −1 . Laser ignition experiments further demonstrates that 15 %Fe-CBO can enhance flame brightness, expand the flame propagation area of AP, RDX and TKX-50, and reduce the time to achieve stable combustion. Moreover, the burning rate of the AP-based composite solid propellant is increased by 1.95 times after the introduction of 15 %Fe-CBO. The decomposition mechanism of AP, RDX, and TKX-50 catalyzed by 15 %Fe-CBO was proposed based on valence band theory and comprehensive experimental characterization. Fe-doping strategy provides a novel approach for the design of efficient combustion catalysts.
研究领域:
材料科学
·
催化
·
应用化学
·
含能材料
·
固体推进剂
·
电子结构调控
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Yang,Ravikumar Yuvaraj,Zhang Guoyan,Yun Junhua,Zhang Yufei,Parvez Amreesh,Qi Xianghui,Sun Wenjing
D-allulose, which is one of the important rare sugars, has gained significant attention in the food and pharmaceutical industries as a potential alternative to sucrose and fructose. Enzymes belonging to the D-tagatose 3-epimerase (DTEase) family can reversibly catalyze the epimerization of D-fructose at the C3 position and convert it into D-allulose by a good number of naturally occurring microorganisms. However, microbial synthesis of D-allulose is still at its immature stage in the industrial arena, mostly due to the preference of slightly acidic conditions for Izumoring reactions. Discovery of novel DTEase that works at acidic conditions is highly preferred for industrial applications. In this study, a novel DTEase, DTE-CM, capable of catalyzing D-fructose into D-allulose was applications. In this study, a novel DTEase, DTE-CM, capable of catalyzing D-fructose into D-allulose was DTE-CM on D-fructose was found to be remarkably influenced and modulated by the type of metal ions (co-factors). The DTE-CM on D-fructose was found to be remarkably influenced and modulated by the type of metal ions (co-factors). The 50°C from 0.5 to 3.5 h at a concentration of 0.1 mM. The enzyme exhibited its maximum catalytic activity on D-fructose at pH 6.0 and 50°C from 0.5 to 3.5 h at a concentration of 0.1 mM. The enzyme exhibited its maximum catalytic activity on -fructose at pH 6.0 and 50°C with a Kcat/Km value of 45 mM−1min−1. The 500 g/L D-fructose, which corresponded to 30% conversion rate. With these interesting catalytic properties, this enzyme could be a promising candidate for industrial biocatalytic applications.
研究领域:
食品科学
·
生物化学
·
酶学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2026
·
IF 25.5
Tingfeng Deng,Rui Wang,Ya You,Hongwei Kang,Xiaodong Wu,Ling Liu,Wenjuan Zhang,Hongbao Li,Longhai Zhang,Chaofeng Zhang
Low room-temperature conductivity, narrow electrochemical stability window, and insufficient mechanical strength restrict the further application of solid polymer electrolytes in solid-state sodium metal batteries (SMBs). Here, we reported a 50 µm-thick fiber-reinforced fluorinated polymer plastic crystal electrolyte (PPCE) prepared via in-situ polymerization. The fluorinated polymer effectively disrupts the ordered structure of the plastic crystal, thus increasing the proportion of amorphous phase that provides rapid Na + transport pathways. Meanwhile, the fluorohydrocarbon and ether units within polymer weaken its binding energy with Na + , which facilitates Na + dissociation and achieves high room-temperature conductivity (2.34 mS cm − 1 ). Furthermore, the fluorine-rich groups enhance PPCE's oxidation resistance and deliver a robust, inorganic F-rich interphase, which stabilize the electrode/electrolyte interface and extend high-voltage tolerance (4.83 V). The integration of a 34 µm-thick polyethylene fiber-reinforced substrate (tensile strength: 8.50 MPa) and the copolymer skeleton provides critical mechanical support. When paired with various cathodes, including Na 3 V 4 (PO 4 ) 3 , Prussian white, Na 3 V 2 (PO 4 ) 2 F 3 , or NaNi 0.33 Fe 0.33 Mn 0.33 O 2 , the cells deliver high capacity, stable cyclability, and excellent rate performance. This work demonstrates a highly compatible and robust PPCE design, highlighting its broad application prospects in advanced solid-state sodium batteries.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kai Zhang,Rui Zhang,Qiguan Wang,Youjun Huang,Qiannan Liang,Guixin Wang,Yuxiao Hu,Ke Qin,Sumin Wang
Loading metal oxides on carbon nanotubes (CNTs) is a commonly used method to enhance the pseudocapacitance (PC) of metal oxides via the improved electrical conductivity. However, the small nanometer-sized tube of CNTs is factually an inaccessible internal channel for the diffusion of large hydrated ions, which reduces the contribution of electric double layer capacitance (EDLC) of CNTs and limits the rate capability of composites. To address this challenge, a 50-nm-diameter channel is here constructed in NiO@nitrogen-containing carbon (NC) by high-temperature calcination of Ni(OH) 2 /polypyrrole nanotube composite. The large-sized NC channel produced from decomposed polypyrrole significantly boosts the internal accessibility and accelerates the flow and penetration of electrolyte into the NC tube, enhancing the EDLC contribution of NCs and improving rate performance. The obtained worm-like NiO@NC shows high ion diffusion coefficient and impressive specific capacitance (SC). The assembled NiO@NC||graphene aerogel asymmetric supercapacitor offers high EDLC contribution of 65 % and exhibits a high SC of 763F g −1 , with outstanding retention of 93.40 % after 50,000 cycles at large current density. This study demonstrates an innovative approach to effectively combat the issue of internal inaccessibility of tubular carbon materials, marking an enormous progression in supercapacitor technology.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）