CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guansheng Ma,Kaili Zhang,Yuefeng Yan,Boshi Gao,Jun Weng,Guangyu Qin,Seeram Ramakrishna,Xiaoxiao Huang
The unique layered structure and adjustable band gap of transition metal dichalcogenides (TMDs) have prompted extensive investigations into their potential for electromagnetic wave absorption (EWA). Vanadium selenide (VSe 2 ), a notable representative of TMDs, has a larger interlayer spacing (6.1 Å) and higher conductivity (1 × 10 -3 S/m), which has high advantageous in EWA applications. However, the existing research on the use of VSe 2 for EWA remains relatively limited. Herein, a flower-branch-like carbon microtube/vanadium selenide (CMT/VSe 2 ) composite was successfully synthesized via a facile solvothermal method. This composite material is composed of flower-like VSe 2 nanostructures integrated with carbon microtubes. Importantly, the EWA properties of this composite can be effectively tailored by adjusting the concentration of the VSe 2 precursor. The CMT/VSe 2 composite exhibited a remarkable minimum reflection loss (RL) of −60.54 dB in the Ku-band, with a matching thickness of 2.27 mm. Moreover, the effective absorption bandwidth reached 6.38 GHz. These results demonstrate the great potential of this CMT/VSe 2 composite material as a highly efficient EWA material. Furthermore, this work broadens the application of two-dimensional TMDs in the area of EWA.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Qingchan Li,Wenjing Yao,Jinhua Zhang,Zhen Li,Wenhao Wang,Jiahao Du,Jinxiang Li
Green rust (GR) is an interlayer anion-containing Fe(II)/Fe(III) mineral material that is versatile in removing a series of ionic contaminants in water. Taking SeO 4 2- (Se(VI)) as the target contaminant, this study identified that the removal processes of Se(VI) by GR could be divided into three stages: initial rapid interlayer exchange, followed by a rebound, and finally slow removal. In addition, as the percentage of SO 4 2- in GR interlayer increased, the Se(VI) removal by GR gradually decreased. To mediate the SO 4 2- -induced rebound of Se(VI), the coupling of GR with iron nanoparticles (nFe 0 @GR) was proposed in this study and it was found that the removal efficiency of Se(VI) by nFe 0 @GR was 3.53 folds greater than that of GR. This study further revealed that the enhanced reactivity of nFe 0 @GR with Se(VI) could be attributed to the re-equilibration of SO 4 2- driven by the formed GR in situ . Since it had a weaker electrostatic repulsion with interlayer SeO 4 2- than pristine GR, the Se(VI) could be quickly removed by nFe 0 @GR without the rebound. Moreover, the nFe 0 @GR was demonstrated to be effective in immobilizing Se(VI) from simulated groundwater and has a great potential to reduce the risk of Se(VI) re-release into the environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Xia Lin,Jiajia Li,Na Li,Xiangqiang Pan,Zhengbiao Zhang,Jian Zhu
Poly(vinyl ether)s (PVEs) are typical products from living cationic polymerization. However, postpolymerization modification (PPM) and topological structure design of poly(vinyl ether)s under relatively mild conditions are rare, which limits their practical applications. Herein, we report a facile method to overcome this limitation by exploiting the selective addition reaction of electrophilic selenium reagent and divinyl monomers, which can produce PVEs with pendent vinyl groups in each repeat unit or end-functionalized PVEs. PPM of PVEs was realized by a thiol–ene click reaction. Furthermore, brush polymers and core cross-linked star polymers were successfully prepared by using end-functionalized PVEs as macromonomers, providing a general method for the preparation of topological polymers and laying a foundation for the development and application of PVEs.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 46
·69450-69461
·
IF 5.19
Liu Ye,Ma Chenglong,Zhou Jiacheng,Zhu Lin,Cao Limei,Yang Ji
Activated carbon was one of the main adsorptions utilized in elemental mercury (Hg 0 ) removal from coal combustion flue gas. However, the high cost and low physical adsorption efficiency of activated carbon injection (ACI) limited its application. In this study, an ultra-high efficiency (nearly 100%) catalyst sorbent-Se x /Activated carbon (Se x /AC) was synthesized and applied to remove Hg 0 in the simulated flue gas, which exhibited 120 times outstanding adsorption performance versus the conventional activated carbon. The Se x /AC reached 17.98 mg/g Hg 0 adsorption capacity at 160 °C under the pure nitrogen atmosphere. Moreover, it maintained an excellent mercury adsorption tolerance, reaching the efficiency of Hg 0 removal above 85% at the NO and SO 2 conditions in a bench-scale fixed-bed reactor. Characterized by the multiple methods, including BET, XRD, XPS, kinetic and thermodynamic analysis, and the DFT calculation, we demonstrated that the ultrahigh mercury removal performance originated from the activated Se species in Se x /AC. Chemical adsorption plays a dominant role in Hg 0 removal: Selenium anchored on the surface of AC would capture Hg 0 in the flue gas to form an extremely stable substance-HgSe, avoiding subsequent Hg 0 released. Additionally, the oxygen-containing functional groups in AC and the higher BET areas promote the conversion of Hg 0 to HgO. This work provided a novel and highly efficient carbon-based sorbent -Se x /AC to capture the mercury in coal combustion flue gas.
Selenium-modified porous activated carbon and the interface functional group promotes the synergistic effect of physical adsorption and chemical adsorption to promote the adsorption capacity of Hg 0 .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 11
·1675-1682
·
IF 3.1
Junai Lv,Qi Li,Xin Guan,Na Lin,Jian Zhang,Zhitai Jia,Xutang Tao
Selenite and tellurite compounds have garnered a lot of attention in both fundamental and applied chemistry. Se4+ and Te4+ cations possess lone pair electrons, which change the coordination environments and performance of these compounds. Here, three new transition metal selenite and tellurite compounds, MSe2O6 (M = Zr, Hf) and HfTe3O8, have been obtained by conventional hydrothermal reactions. The crystallographic structures of the three compounds are discussed in detail; meanwhile, thermal analysis, optical spectra, birefringence and theoretical calculations are also reported. Isostructural ZrSe2O6 and HfSe2O6 exhibit partially distorted octahedral and tetrahedral configurations. Moreover, ZrSe2O6 and HfSe2O6 have birefringence (Δn = 0.1052, 0.096) and short UV cut-off edges (212, 208 nm), and compared with ZrSe2O6, the thermal stability of HfSe2O6 is slightly larger. ZrSe2O6 and HfSe2O6 are adequate candidates as birefringent crystals in the UV region. Remarkably, HfTe3O8 not only has high thermal stability, but also provides a short UV cut-off edge (234 nm). It can meet the multiple requirements of the developing photoelectric system for UV window materials and has broad application prospects. Furthermore, the intrinsic relationship between the physical properties of the three crystals and their unique electronic structures is revealed.
研究领域:
材料科学
·
无机化学
·
光学工程
·
晶体学
·
物理化学
✓ 已验证
DOI
高影响因子
Joule
·
2019
·
IF 0
Yang Jin,Kai Liu,Jialiang Lang,Xin Jiang,Zhikun Zheng,Qinghe Su,Zeya Huang,Yuanzheng Long,Chang-an Wang,Hui Wu,Yi Cui
Lithium-sulfur (Li-S) and Lithium-selenium (Li-Se) batteries are considered as promising candidates for next-generation battery technologies, as they have high energy density and low cost. However, due to the use of a solid Li-metal anode and a liquid organic electrolyte, the current Li-S and Li-Se batteries face several issues in terms of Coulombic efficiency and cycling stability, which seriously impeded their development. Here, we report solid-electrolyte-based liquid Li-S and Li-Se (SELL-S and SELL-Se in short) batteries. The batteries use a Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) ceramic tube as electrolyte and work at temperatures higher than the melting point of Li; thus, polysulfide or polyselenide shuttle effects and Li dendrite growth are effectively prevented, and high energy density, together with high stability, fast charge/discharge capability, high Coulombic efficiency, and high energy efficiency, can be achieved. The SELL-S and SELL-Se batteries provide broader platforms for constructing high-energy, high-power, long-lifetime, and low-cost energy storage.
研究领域:
电化学储能
·
新能源材料
·
无机非金属材料
✓ 已验证
DOI
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505406
·
IF 3.874
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Desong Guo,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
The low sulfur utilization, cycling instability, and sluggish kinetics are the critical obstructions to practical applications of lithium–sulfur batteries (LSBs). Constructing sulfur hosts with high conductivity, suppressed shuttle effect, and rapid kinetics is essential for their practical application in LSBs. Here, we synthetically utilized the merits of ZnSe quantum dots (QDs) and layered Ni(OH)2 to boost the performance of LSBs. A novel core–shell ZnSe-CNTs/S@Ni(OH)2 was constructed using the ZnSe-CNTs network as framework to load sulfur and following with Ni(OH)2 encapsulation. The CNT network decorated with ZnSe QDs not only serves as a conductive framework providing fast electron/ion transfer channels, but also limits polysulfide diffusion physically and chemically. Layered Ni(OH)2, the wrinkled encapsulation, not only permits fast electron/ion transfer, but also buffers the expansion, confines active materials, and limits the polysulfide dissolution chemically. When used as a cathode, ZnSe-CNTs/S@Ni(OH)2 presents enhanced electrochemistry performance compared with ZnSe-CNTs/S and CNTs/S. The average specific capacity decreases from 1021.9 mAh g−1 at 0.2 C to 665.0 mAh g−1 at 2 C, showing rate capacity much higher than ZnSe-CNTs/S and CNTs/S. After 150 cycles, the capacity at 0.5 C slowly reduces from 926.7 to 789.0 mAh g−1, showing high retention of 85.1%. Therefore, our investigation provides a new strategy to construct a promising sulfur cathode for LSBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2017
·
IF 5.835
Yan Wang,Ming-Zhe Lv,Nan Song,Zeng-Jie Liu,Chunyu Wang,Ying-Wei Yang
We report a new strategy to construct a multi-stimuli-responsive fluorescent supramolecular polymer by the strong host–guest interactions between a diselenium bond-bridged pillar[5]arene dimer and an AIE-active tetraphenylethylene (TPE)-containing neutral guest bearing two imidazole terminal binding sites. The resulting supramolecular polymer shows a remarkable fluorescence emission decrease at low concentration. Significantly, the diselenium bonds introduced into the supramolecular polymer serve as redox-responsive building blocks. Upon addition of reductants, the supramolecular polymer depolymerized owing to the cleavage of the covalent diselenium bonds in the system. On the other hand, competitive guests such as adiponitrile, which bind strongly with pillar[5]arenes, could lead the disassembly of the polymer to oligomers without breaking any covalent bonds in the system. These two types of depolymerization approaches can both result in the fluorescence intensity recovery of the system to a certain extent, which will hopefully enrich the methodology toward the construction of smart supramolecular polymeric materials with different properties.
研究领域:
超分子化学
·
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shiquan Li,Jianhua Zhu,Wei Lu,Zhaoxi Liu,Zhuosen Wang,Liu Wang,Yapeng Tian,Xinwei Cui
Sodium-selenium (Na-Se) batteries have gained attention due to their high energy density and power density, resulting from the liquid–liquid reaction at the interface in the dimethoxyethane electrolyte. Nevertheless, the pronounced shuttle effect of polyselenides causes low coulomb efficiency and inadequate cycling stability for Na-Se batteries. Herein, the iron nanoparticles surface modified accordion-like Ti 3 C 2 T x MXene (MXene/Fe) synthesized via the molten salt etching is utilized as the host of Se species for high-performance Na-Se battery cathode. Benefiting from the layered structure and chemical adsorption of accordion-like MXene, the shuttle effect of the cathode is effectively inhibited. Simultaneously, electrochemical kinetics is boosted due to the catalytic effect of Fe nanoparticles, which facilitate the transformation of polyselenide from long-chain to short-chain, contributing to pseudocapacitive capacity. Consequently, the Se-based cathode delivers a steady capacity of 575.0 mA h g −1 at 0.2 A/g, and even a high capacity of 500 mAh/g at 50 A/g based on the mass of Se@MXene/Fe electrode, indicating the ultrafast Na + ion storage. Most notably, this structure demonstrated remarkable long-term cycling stability for 5000 cycles with a high capacity retention of 97.4 %. The electrochemical energy storage mechanism is further revealed by in situ Raman. Herein, the confinement-catalysis structure shines light on inhibiting shuttling and facilitating ultrafast ion storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hua Yang,Mingshan Wang,Tao Wang,Hao Xu,Zhenliang Yang,Lei Zhang,Junchen Chen,Yun Huang,Xing Li
Lithium-sulfur (Li-S) batteries have been regarded as a competitive candidate for next generation electrochemical energy-storage technologies. However, the insulation of charge and discharge products (sulfur and lithium sulfide) and the shuttle efforts of lithium polysulfides (LiPSs), result in not only a series of phase conversion but also sluggish redox kinetics in Li-S electrochemistry. Herein, we firstly designed a flexible carbon cloth/molybdenum selenide (CC/MoSe 2 ) by growing ultra-thin MoSe 2 nanosheets on CC as binder-free electrode to understand the regulation mechanism in Li-S battery. With systematic electrochemical investigation of in-situ deposition Li 2 S 8 in CC/MoSe 2 , it is found that CC/MoSe 2 exhibits high LiPSs chemical adsorption and electrocatalytic activity, which large enhances the LiPSs conversion. The dynamic regulation of LiPSs change the nucleation and growth of Li 2 S, resulting in high uniform distribution on CC/MoSe 2 electrode. Thus, it obtains high sulfur redox kinetics and utilization, which achieves initial capacity of 1142 mAh g -1 with low capacity fade of only 0.038 % per cycle over 500 cycles at 1 C. Even at high S loading (4 mg cm -2 ) and extremely low electrolyte/S (E/S) ratio of 6.2 μL mg -1 , it still delivers 1204 mAh g −1 after 100 cycles at 0.2C with 93.3% capacity maintain.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 8
·3495-3506
·
IF 3.442
Zhao Chenhao,Shen Zhen,Tu Fengzhang,Hu Zhibiao
Transition metal selenides nanoparticles/carbon composites have been one of the promising lithium/sodium ion battery anodes. In the present study, NiSe x nanoparticles encapsulated into microporous flowerlike carbon have been prepared by a hydrothermal route directed by the flowerlike Ni/C composite template. In a low hydrothermal temperature (i.e., 120 °C), the metallic Ni nanoparticles are transformed into Ni 0.85 Se, which has an average particle size of ~ 13.02 nm. The selenization degree and particle size can be obviously improved at a higher hydrothermal temperature (i.e., 160 or 180 °C), accompanying with the decrease in carbon content, and partial Ni 0.85 Se nanoparticles have been transformed into NiSe 2 . As anode of lithium ion batteries, the NiSe x obtained at 180 °C (i.e., 180 °C-NiSe) can deliver a higher discharge capacity (e.g., 851.0 mA h g −1 after 100 cycles at 0.2 A g −1 ) and better cycling stability compared with the low temperature obtained sample. However, the rate capability and sodium ion storage performance of 120 °C-Ni 0.85 Se are better than the 180 °C-NiSe x , and a discharge capacity of 326.5 mA h g −1 can be reached at a high rate of 5 A g −1 for 120 °C-Ni 0.85 Se. Also, a high capacity retention ratio of 64.3% after 100 cycles can be reached for 120 °C-Ni 0.85 Se as sodium ion battery anode. The different electrochemical performance can be attributed to the decreased particle size.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiaoli Lu,Xinyi Zhou,Qin Yang,Xiaomin Huang,Qiaoji Zheng,Dunmin Lin,Yingze Song
Lithium–sulfur batteries (LSBs) have attracted much attention due to their high theoretical specific capacity, energy density and low cost. However, the commercial application of LSBs is hindered due to the lithium polysulfide (LiPS) shuttle as well as the sluggish reaction kinetics. Herein, cobalt selenide (Co 0.85 Se) nanowire arrays have been constructed on a carbon-modified separator by an in-situ electrodeposition technique without any other post-treatments such as coating with other ancillary materials. The introduced three-dimensional (3D) conductive carbon layer comprising of carbon nanotube (CNT) and acetylene black (AB) not only serves as the effective support for Co 0.85 Se (CS) but also builds a hierarchical structure to promote the e − transfer. The as-obtained CS-CNT/AB presents a strong anchoring effect on LiPSs and high electrocatalytic activity for sulfur reaction kinetics. As a result, the LSBs inserted with electrodeposition-enabled CS modified separator exhibit an outstanding rate capability (1560.4 mAh g −1 at 0.1 C) and relatively low capacity decay of only 0.068% per cycle over 500 cycles at 2.0 C. This study provides a promising strategy to realize the rational construction of high-efficiency and long-life LSBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）