JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 21
·26189-26201
·
IF 2.478
Zhang Xian-Hui,Liu Jun-Jun,Zha Liang-Liang,Chen Ji-Wei,Chen Bao,Wu Jian-Hua,Yu Hong-Liang
MnZn ferrites and their magnetic, electrical, and optical properties make them highly suitable in a number of applications. These ferrites are used in electronic applications, magnetic fluids, and household appliances such as washing machines, refrigerators, and microwave ovens. This paper focuses on a hydrothermal method used to prepare a bayberry spherical manganese–zinc ferrite (Mn 0.5 Zn 0.5 Fe 2 O 4 ), its surface was coated with dopamine (Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) and then carbonized to obtain the core–shell structure C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA. Preliminary results show that carbon-coated manganese–zinc ferrite with saturation magnetic properties and coercivity increased from 99 emu and 66.01 Oe to 138 emu and 104.85 Oe, respectively. In addition, the carbonized Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA (C-Mn 0.5 Zn 0.5 Fe 2 O 4 @PDA) exhibited favorable microwave absorbing performance with minimum reflection loss (RL min ) of − 17.56 dB and also revealed that the broadest effective absorption bandwidth (RL min ≤ − 10 dB) 5.36 GHz (11.70–17.06 GHz) can be achieved at 2.0 mm.
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CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Yan Dong,Yuezhan Feng,Jiwei Deng,Pengbin He,Jianmin Ma
Antimony-based materials have become promising anodes within lithium-ion batteries (LIBs) due to their low cost and the high theoretical capacity. However, there is a potential to further enhance the electrochemical performance of such antimony-based materials. Herein, Sb 2 Se 3 @C nanofibers (Sb 2 Se 3 @CNFs) are designed and obtained via a novel electrospinning method. Upon electrochemically testing as an anode within LIBs, the Sb 2 Se 3 @CNFs (annealed at 600 °C) delivers a remarkably good cycling performance of 625 mAh/g at 100 mA/g after 100 cycles. Moreover, it still remains at 490 mAh/g after 500 cycles with an applied current density of 1.0 A/g. The excellent performance of the Sb 2 Se 3 @CNFs can be attributed to the fact that the N-doped C matrices not only remit the volume expansion of materials, but also enhance the electrical and ionic conductivity thusly increasing the lithium-ion diffusion. The obtained Sb 2 Se 3 @CNFs are promising anode for LIBs in the future.
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Journal of CO2 Utilization
·
2019
·
IF 5.189
Weiqi Liu,Zhichao Miao,Zhenbin Li,Xiaozhong Wu,Pengfei Zhou,Jinping Zhao,Huahua Zhao,Weijiang Si,Jin Zhou,Shuping Zhuo
A series of Co@N-C materials are synthesized from pyrolysis of ZIF-67 at different temperatures and employed as catalyst for electrochemical reduction of CO 2 (CO 2 RR) to syngas. Through a systematical investigation of the relationship between structure of Co@N-C catalysts and their catalytic activity, it could be found that the Co species exposed on the material surface mainly promote the hydrogen evolution reaction (HER) process to produce H 2 , while the Co particles packaged by N-C skeleton provide electrons and transfer them to CO 2 molecule through the Co -N- C skeleton, promoting the CO 2 reduction reaction. Following this thinking, the pristine Co@N-C materials are treated by aqua regia to remove the surface exposed Co species. After acid treatment, the affinity of H species sharply decreases, and adsorption of CO 2 and transfer of electron to CO 2 are successfully improved. The acid-treated Co@N-C catalysts exhibit improved catalytic activity, faradic efficiency of CO, and stability in CO 2 RR process. Among all these catalysts, the obtained Co@N-C-700-A shows highest CO 2 reduction activity and stability, achieving a specific current of 25 A∙g (cat) −1 and a productivity of 0.266 mol (CO) h −1 ∙ g(cat) −1 at a mild potential of -0.57 V vs. RHE. The ratio of CO/H 2 in products could be adjusted in the range of 1/4 to 1.5/1.
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NANO
·
2015
·
IF 1.09
Yupeng Gao,Hao Chen,Aiguo Zhou,Zhengyang Li,Fanfan Liu,Qianku Hu,Libo Wang
Hierarchical TiO 2 /carbon nanocomposites were synthesized by oxidation of two-dimensional (2D) Ti 3 C 2 nanosheets at different temperatures. Crystal structures and morphologies of the obtained samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Raman spectroscopy. The results show that 2D Ti 3 C 2 nanosheets are partially oxidized to form a novel hierarchical nanostructure which is composed of carbon nanosheets and TiO 2 nanoparticles. With the calcination temperature increasing, the crystal structure of TiO 2 nanoparticles changes from anatase to rutile and the hierarchical structure was gradually destroyed. The photodegradation results reveal that the samples obtained at 200°C and 285°C show much better photocatalytic properties than P25. And meanwhile the photocatalytic property will become worse with the increase in calcinations temperature.
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IONICS
·
2024
·Vol. 30
·期 3
·1615-1625
·
IF 2.4
Dong Jinxiu,Cui Shichuang,Wang Fei,Wei Wei,Yin Ziluo,Zhang Yuqing,Zhu Quanyao
Electrochromism (EC) is a color control technique for providing visual information, in which vanadium pentoxide (V 2 O 5 ) is a promising material for electrochromic applications due to its excellent ionic intercalation/deintercalation properties and cathodic/anodic color-changing properties. However, its poor cycling stability and color change response rate limit its practical application. Metal–organic frameworks (MOFs) combine the rigidity and flexibility of inorganic–organic materials and can meet the requirements of EC materials such as cycle stability, electrical conductivity, and stress-interference resistance. We report here a strategy to modify V 2 O 5 with Cu-MOF. Cu-doped V 2 O 5 and carbon skeleton (Cu 2 V 2 O 7 @C) composites were prepared for electrochromism. In this scheme, Cu doping can facilitate lithium ion migration by broadening and stabilizing the structure of V 2 O 5 , and the distribution of the carbon skeleton can broaden the contact of the active material with the electrolyte and improve the electron conduction. Combining these merits, it exhibits excellent long-term cycle stability (the capacity retention rate reaches 91.78% after 2000 cycles), the light transmission modulation is greatly improved compared with V 2 O 5 (Δ T = 69%, doubled), and the response time is reduced by 30.43%. This study provides a new perspective for improving the light modulation ability and long-term use stability of vanadium oxide EC materials and promotes the development of MOF materials in the field of electrochromism.
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Journal of Pharmaceutical Analysis
·
2024
·
IF 6.1
Xin Yang,Guang-Yuan Ma,Xiao-Qiang Li,Na Tang,Yang Sun,Xiao-Wei Hao,Ke-Han Wu,Yu-Bo Wang,Wen Tian,Xin Fan,Zezhi Li,Caixia Feng,Xu Chao,Yu-Fan Wang,Yao Liu,Di Li,Wei Cao
Hepatocellular carcinoma (HCC) expresses abundant glycolytic enzymes and displays comprehensive glucose metabolism reprogramming. Aldolase A (ALDOA) plays a prominent role in glycolysis; however, little is known about its role in HCC development. In the present study, we aim to explore how ALDOA is involved in HCC proliferation. HCC proliferation was markedly suppressed both in vitro and in vivo following ALDOA knockout, which is consistent with ALDOA overexpression encouraging HCC proliferation. Mechanistically, ALDOA knockout partially limits the glycolytic flux in HCC cells. Meanwhile, ALDOA translocated to nuclei and directly interacted with c-Jun to facilitate its Thr93 phosphorylation by P21-activated protein kinase; ALDOA knockout markedly diminished c-Jun Thr93 phosphorylation and then dampened c-Jun transcription function. A crucial site Y364 mutation in ALDOA disrupted its interaction with c-Jun, and Y364S ALDOA expression failed to rescue cell proliferation in ALDOA deletion cells. In HCC patients, the expression level of ALDOA was correlated with the phosphorylation level of c-Jun (Thr93) and poor prognosis. Remarkably, hepatic ALDOA was significantly upregulated in the promotion and progression stages of diethylnitrosamine-induced HCC models, and the knockdown of ALDOA strikingly decreased HCC development in vivo . Our study demonstrated that ALDOA is a vital driver for HCC development by activating c-Jun-mediated oncogene transcription, opening additional avenues for anti-cancer therapies.
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PubMed
高影响因子
IONICS
·
2012
·Vol. 19
·期 3
·529-534
·
IF 1.288
Wang Wei,Wang Hui,Key Julian,Linkov Vladimir,Ji Shan,Wang Rongfang
To improve the electrocatalytic properties of PtRu/C in methanol electrooxidation, nanoparticulate TiO 2 -promoted PtRu/C catalysts were prepared by directly mixing TiO 2 nanoparticles with PtRu/C. Using cyclic voltammetry, it was found that the addition of 10 wt% TiO 2 nanoparticles can effectively improve the electrocatalytic activity and stability of the catalyst during methanol electrooxidation. The value of the apparent activation energy ( E
a ) for TiO 2 -PtRu/C was lower than that for pure PtRu/C at a potential range from 0.45 to 0.60 V. A synergistic effect between PtRu and TiO 2 nanoparticles is likely to facilitate the removal of CO-like intermediates from the surface of PtRu catalyst and reduce the poisoning of the PtRu catalysts during methanol electrooxidation. Therefore, we conclude that the direct introduction of TiO 2 nanoparticles into PtRu/C catalysts offers an improved facile method to enhance the electrocatalytic performance of PtRu/C catalyst in methanol electrooxidation.
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VACUUM
·
2025
·
IF 3.9
Fan Wang,Junqi Pan,Guozhi Wu,Zhangna Hu,Areeje Fatima,Jiarui Huang
The large radius of sodium ions induces significant volume expansion in the anode during charging and discharging, potentially damaging the electrode structure and leading to the deterioration of the battery's cyclic performance. In this work, Cu/Fe bimetallic oxalate nanorod precursors were prepared via a liquid-phase precipitation process and subsequently calcined in air to form bimetallic oxides. These oxides were then coated with resorcinol-formaldehyde resin and subjected to carbonization and selenization process to fabricate porous carbon-coated CuFeSe 2 (CuFeSe 2 @C) nanorod composite materials. Electrochemical studies confirmed that the CuFeSe 2 @C electrode represented stable cycling performance as an anode for Na + battery. Notably, this electrode had a reversible capacity of 295.8 mAh g −1 after 3500 cycles at a current density of 10.0 A g −1 . The interstitial space between the conductive carbon layer and the active material mitigates volume expansion, reduces fragmentation or detachment of the active material, enhances the stability of the cycling and service life of battery.
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ENERGY & FUELS
·
2026
·Vol. 40
·期 30
·16618-16630
·
IF 6
Zhang Jing,Liu Fang-Jing,Xia Lei,Wang Meng-Jie,Xia Wei-Zhen,Zhao Mei-Xia,Zhao Yun-Peng,Zhong Mei,Wei Xian-Yong
Selective cleavage of stable C–C bridging bonds
in the macromolecular
framework of low-rank coal is crucial for its mild conversion to aromatics.
Herein, a bifunctional CoMoS/HY catalyst, featuring highly dispersed
CoMoS nanosheets anchored on ordered HY channels (3–4 nm),
was successfully constructed for the selective hydrocracking of low-rank
coal. Strong metal–support interactions stabilize surface Mo
species and enrich weak acid sites. The weak Lewis acid sites are
primarily responsible for driving the polarization and activation
of C–C bridging bonds. Consequently, the incorporation of HY
remarkably boosts intrinsic activity, giving outstanding turnover
frequencies (TOF) of 85.4 h –1 for Mo and 89.7 h –1 for acid sites (both three times higher than unsupported
CoMoS). Under mild conditions (270 ° C, 2 MPa H 2 , 3
h), the catalyst achieved 98.70% diphenylmethane conversion with >96%
selectivity for arenes. When applied to catalytic hydrocracking of
residue from the thermal dissolution of Naomaohu coal, it produced
a liquid oil yield of 37.2 wt %, which is more than five times higher
than that of the noncatalytic hydrocracking, while also demonstrating
deoxygenation and coke suppression capabilities. This work highlights
a metal–acid-driven synergistic pathway for the efficient conversion
of low-rank coal into high-value arenes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jinghai Zhang,Kangjun Ji,Zirui Wang,Wei Shi,Zhongkai Zhao,Xiao Du,Xiaogang Hao
The rapid growth in lithium demand for battery applications has driven the need for safe and efficient extraction technologies from salt lake brines. Current methods face challenges including low recovery rates, slow adsorption kinetics, and environmental concerns from organic solvent usage. To address these limitations, the environmentally friendly electrochemically switched ion exchange (ESIX) system using a three-dimensional LiMn 2 O 4 /C/SA-c-PEO@GF electrode was developed. The electrode employs sodium alginate (SA) and polyethylene oxide (PEO) as chemically cross-linked binders on a graphite felt (GF) current collector. In the constant current-constant voltage coupling drive mode, the system achieved 97% lithium extraction efficiency with an adsorption capacity of 3.89 mg·g −1 and a Li + /Mg 2+ separation coefficient of 191, the energy consumption was 14.51 Wh·mol −1 and 485 mg·L −1 Li + solution was obtained from actual Zarkhan Salt Lake brine (Mg 2+ /Li + : ∼426.6) by one-step concentration. This study shows the LiMn 2 O 4 /C/SA-c-PEO@GF electrode with high extraction efficiency and fast adsorption rate, providing a simple and efficient method for lithium recovery from salt lake brine with high Mg 2+ /Li + ratio.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yu Zhou,Xinyu Song,Shenggang Yan,Chunhua Ni,Li Xu,Liangmin Yu,Xia Li
Biomass-derived carbon has attracted extensive attention because of its unique form, wide range of sources and low cost. However, the construction of efficient biomass-based microwave absorbers with hierarchical structures and multicomponent magnetic/dielectric structures remains a great challenge. Therefore, CoNi-MOF was self-assembled in situ on the plant Juncus effusus by the microwave method, and CoNi/NC/C composites were prepared by in situ pyrolysis in a nitrogen atmosphere. The morphology, electromagnetic parameters, specific surface area and porous structure of the composites were adjusted by controlling the pyrolysis temperature. For a pyrolysis temperature of 600 ℃ and filling of 16 wt%, the composite was found to show an RL min value of − 64.3 dB at 12.88 GHz at a thickness of 2.5 mm, and the effective absorption bandwidth (EAB)reached 7.36 GHz. The excellent microwave absorption performance was attributed to conduction loss, dipole polarization, interface polarization, magnetic loss and balanced impedance matching.
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VIBRATIONAL SPECTROSCOPY
·
2022
·
IF 2.382
Zhiqiang Wang,Siqi Duan,Bin Fang,Zhenxiang Liu,Ruiting Zhang,Lin Ma,Ke Lin
Identifying the molecular structures of drugs are important for understanding the molecular interactions between drugs and proteins. Especially in situ measurement of drug structures that interact with proteins in aqueous solutions or cells is a challenge. In this work, mandelic acid (MA) was used as a model molecule to prove that the Raman spectra in the C-H or C-D stretching region can be employed to identify the molecular structure through theoretical and experimental Raman spectra and molecular dynamics simulations methods. Using the experimental and theoretical Raman spectra of MA rotamers, C α -H was determined to be trans (higher than 2950 cm −1 ) and nontrans (below 2950 cm −1 ) from the α-OH group for solid DL-MA (~2961 cm −1 ) and D -MA (~2898 cm −1 ), respectively, which agreed well with the results from X-ray diffraction. Molecular dynamic (MD) simulations and Raman band of the MA aqueous solution revealed that the C α -H group was determined to be nontrans from the α-OH group, the structure of the carboxyl group was cis (~2910 cm −1 ), the carboxyl group was roughly vertical to the C α -benzene bond, and the benzene ring was approximately coplanar with the C α -H bond. Our work also paves that the Raman spectra in the C-D or C-H stretching region could be used as fingerprint regions to study the structure of drugs.
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