CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenmiao Zhao,Lishi Mo,Xiaoyuan Shi,Bo Liu,Guangmin Yang,Ting Deng
CoTe 2 as a potential electrode material for sodium-ion batteries (SIBs) suffers severe volume expansion and rapid capacity degradation. Herein, we propose an anionic chemistry regulation strategy to enhance the redox performance of CoTe 2 by Se substitution which creates more porosity inside the structure to accommodate the volume expansion. Physical characterizations and theoretical calculations have studied the structural and dynamical influence of Se/Te ratio on the overall performance. As a result, CoSe 1.33 Te 0.67 @C with a 〈1 1 1〉 preferential growth direction exhibited the most balanced performance, which delivered a high initial specific capacity of 795 mAh/g at 0.05 A/g, a high rate performance of 5 A/g and a capacity retention of 370 mAh/g after 400 cycles at 0.5 A/g. Accordingly, a full SIB was constructed with a Na 3 V 2 (PO 4 ) 3 cathode and a CoSe 0.67 Te 0.33 @C anode, delivering a maximum energy density of 197.2 Wh kg −1 . These results have proved that anionic chemistry regulation is quite efficient to synthesize metal tellurides with high redox activity and long life-span for SIB .
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Fuqiang Fan,Lu Wang,Feng Li,Yu Fu,Huaping Xu
Tellurium-containing photoresponsive polyelectrolyte multilayer films were fabricated by layer-by-layer assembly of a tellurium-containing polymer, photosensitizer, and poly(styrenesulfonate). The resulting films were investigated by UV/vis spectroscopy, XPS, EPR, and fluorescence spectroscopy. Under visible light, the photosensitizer in the film is excited and transforms triplet oxygen into singlet oxygen in aqueous solution. Singlet oxygen oxidizes −Te– to high valence state (Te═O) on the polymer backbone. The generated (Te═O) group makes the micelles more hydrophilic and looser, thereby facilitating the controlled release of the loaded cargo of micelles. These results show that the film has the potential to be used for cargo loading and controlled release, thus may provide a new way to combine photodynamic therapy and chemotherapy.
研究领域:
材料科学
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聚合物化学
·
生物医学工程
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治疗诊断学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 31
·4520-4527
·
IF 5.375
Lu Wang,Wencong Wang,Wei Cao,Huaping Xu
Nanomaterials with hierarchical responsiveness are of great significance not only for fundamental science but also for future biomedical applications due to sophisticated and hierarchical physiological environments. Herein, we report a selenium- and tellurium-containing block copolymer that can be stepwise oxidized by both chemical methods and electrochemical methods. Differences in sensitivity to the oxidation of selenium and tellurium were employed. By tuning the concentration of the oxidant and oxidation periods, self-assembly behaviors of the copolymer were tuned by stepwise chemical oxidation. After oxidation, some interesting morphological evolution was observed that the polymer micelles crosslinked with each other without any swelling. In the case of electrochemical oxidation, the voltage during the electrochemical oxidation and the oxidation period also affected the level of oxidation. Furthermore, we showed that the degree of electrochemical oxidation varied with a different PEG block length. Considering sophisticated physiological conditions in vivo, this hierarchically responsive system may provide new possibilities as smart delivery vehicles in biological environments.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Yaping Pan,Fawei Zheng,Xixi Wang,Hongye Qin,Enzuo Liu,Junwei Sha,Naiqin Zhao,Ping Zhang,Liying Ma
Hydrogen evolution reaction (HER) activities of WS 2 can be improved by doping exotic atom to increase active sites on base plane and narrow the bandgap. However, most of these catalysts of exotic atom doped WS 2 are composed of semiconductor and the electronegativity between atoms is similar, which do harm to tuning bandgap with a wide range and decreasing the value of free Gibbs energy (Δ G H ) for hydrogen adsorption. Given that Te can tune bandgap with a wide range and the electronegativity between S and Te differ greatly, a vertically arranged WS 2 nanoelectrode is prepared by doping Te on WS 2 . According to experimental studies and the density functional theory calculations (DFT), the bandgap of WS 2 nanosheets is successfully narrowed after doping Te. This lowers the Schottky barrier which benefits the transfer of charges and improves electrocatalytic performance in turn. Meanwhile, the presence of Te atoms with much lower electronegativity than S increases the electron density of the adjacent region, thereby the S edges of basal plane around Te atoms and hollow sites of WS 2 nanosheet become active to drive HER, which has been verified by the reduced Δ G H of S edges of basal plane from 2.27 to 2.08 eV and hollow sites from 2.28 to 1.85 eV after the doping in DFT. Te-doped WS 2 nanosheets used as excellent HER catalysts with an overpotential of 213 mV to drive a current density of 10 mA/cm 2 , a small Tafel slope of 94 mV/dec, along with a superior stability in acid media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Fangfang Ren,Hongjun Pan,Cheng Wang,Yukou Du
Graphical Two-dimensional hexagonal bismuth telluride (Bi 2 Te 3 ) nanosheet were successfully synthesized by a facile solvothermal method, and then coupled with Pd by a microwave-assisted ethylene glycol reduction method to obtain the Pd/Bi 2 Te 3 composite, which delivered superior catalytic performance for the electrooxidation of glycerol in alkaline medium. Designing high-performance anodic catalysts to drive glycerol oxidation reaction (GOR) is essential for advancing direct alcohol fuel cells. Coupling Pd with oxophilic materials is an effective strategy to enhance its intrinsic catalytic activity. In this study, we successfully synthesized Pd/Bi 2 Te 3 catalysts with tunable compositions, using Bi 2 Te 3 as a novel promoter, and applied them to the GOR for the first time. Electrocatalytic tests revealed that the activity of the Pd/Bi 2 Te 3 catalysts was closely linked to their compositions. Among these catalysts, the optimized Pd/Bi 2 Te 3 -20 % showed potential to replace the commercial Pd/C catalyst, exhibiting a peak current density 5.2 times higher than that of the benchmark Pd/C catalyst. Furthermore, improved catalytic stability and faster catalytic kinetics were observed for Pd/Bi 2 Te 3 -20 %. The synergistic effect between Pd and Bi 2 Te 3 is responsible for the high performance of the Pd/Bi 2 Te 3 -20 % catalyst.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Tingyu Wang,Han Luo,Shunke Zhang,Ling Huang,Liling Cao,Xuehua Dong,Guohong Zou
Two tellurium(IV) vanadates, KTeOVO4 and Ca2TeV2O9, were synthesized by integrating Te4+ with lone-pair of electrons and V5+ exhibiting the second-order Jahn–Teller effect (SOJT) active centers. Both compounds feature unique one-dimensional chain structures formed by [TeO4] and [VOx] polyhedra, resulting in notable birefringence values of 0.162 and 0.128 at 546 nm, respectively, higher than those of commonly used materials like α-BaB2O4 (0.116@1064 nm) and LiNbO3 (0.074@1440 nm). Additionally, they demonstrate excellent thermal stability (up to 500 and 700 °C) and broad transparency ranges (0.39–10.00 μm and 0.53–10.68 μm), enabling potential applications in near- and mid-infrared optical devices. Structural and theoretical analyses reveal that the enhanced birefringence arises from the synergistic effects of Te4+ lone-pair electrons and the anisotropic polarizability of V5+ centers.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Qiufeng Meng,Qinglin Jiang,Kefeng Cai,Lidong Chen
PEDOT:PSS coated Te (PC Te) nanorod/PEDOT:PSS composite films were prepared by a drop-casting technique. H 2 SO 4 treatment was employed to enhance thermoelectric (TE) properties of the composite films. The addition of PC Te nanorods increased both the electrical conductivity and the Seebeck coefficient of the composite films. An optimized power factor of 141.9 μW/mK 2 was obtained for the film containing 90 wt% PC Te nanorods treated with 12 M H 2 SO 4 at room temperature , which was 2.75 times as high as that of the untreated composite film, corresponding to the electrical conductivity and Seebeck coefficient of 204.6 S/cm and 83.27 μV/K, respectively. XPS and GIWAXS analysis revealed the removal of insulating PSS units and the rearrangement of PEDOT chains after the H 2 SO 4 treatment. Finally, a 9-leg TE generator prototype was fabricated using the optimized composite film. The maximum output power and area output power density produced from the prototype were 47.7 nW and 57.2 μW/cm 2 , respectively, at the temperature difference of 40 K.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 44
·4566-4571
·
IF 2.524
Wen-Dong Yao,Mei Yan,Xiao-Hui Li,Wenlong Liu,Ru-Ling Tang
Graphical A novel transition metal tellurite phosphate Cd 3 (PO 4 )(TePO 6 ) features a new type of {[TePO 6 ] 3− } ∞ chain was obtained by solid-state reactions, and its electronic structure and optical properties are studied systematically. New inorganic crystals containing multiple anions have received extensive attensions recently in view of their abilities to be potential multifunctional materials. Among them, tellurite-phosphates with simple chemical components are relatively rarely studied. Here, one novel tellurite phosphate Cd 3 (PO 4 )(TePO 6 ) was obtained through conventional soild-state reaction, and it is the first tellurite-phosphate only possessing d 10 transition metal. It crystallizes in the monoclinic space group P 2 1 / c , and its structure features an interesting {[TePO 6 ] 3− } ∞ chain constructed by corner-sharing connected PO 4 and TeO 4 tetrahedra. Meanwhile, we obtained a new phase of Cd 3 (PO 4 ) 2 and Cd 1.725 Mg 1.275 (PO 4 ) 2 in the exploration of tellurite-phosphates, and they also crystalize in the centric space group P 2 1 / c . Crystal structures, theoretical calculations on their electronic structure and birefringence have been studied, together with the IR and UV-vis-NIR diffuse reflectance spectra.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Guangxu Yao,Jin Wan,Yangjun Luo,Dong Liu,Guolong Qiu,Huijuan Zhang,Yu Wang
Strategic localization of catalytically active sites within single-atom catalyst (SAC) architectures represents a pivotal determinant of material performance, particularly in two-dimensional (2D) substrates like MXenes, which offer intricate structural complexity and multifarious anchoring potentialities. Despite the burgeoning interest in non-metallic single-atom catalysts, a comprehensive understanding of site-specific loading mechanisms and their consequential catalytic implications remains substantially unexplored. Herein, we systematically investigate the precise incorporation of economically viable non-metallic elements—tellurium (Te) and arsenic (As)—onto Ti 3 C 2 MXene, a prototypical 2D material characterized by exceptional structural versatility. Our methodology delineates a nuanced approach to controllable single-atom immobilization, strategically differentiating between vacancy-embedded and surface-supported configurations. Through meticulous experimental design, we demonstrate that Te single atoms strategically integrated within titanium vacancies (C-TeSA-T) manifest superior Oxygen Reduction Reaction (ORR) electrocatalytic performance compared to surface-anchored counterparts (W-TeSA-T). Comprehensive characterization revealed remarkable electrocatalytic metrics, including a half-wave potential of 0.88 V vs. RHE and a limiting current density of 5.65 mA/cm 2 . Synergistic Density Functional Theory (DFT) computations and multi-potential X-ray Photoelectron Spectroscopic (XPS) analyses elucidated the intrinsic mechanistic landscape, conclusively identifying Te single atoms as primary catalytic centers and delineating the rate-determining reaction trajectory. This systematic investigation not only introduces an innovative paradigm for designing cost-effective non-metallic catalysts but also provides fundamental mechanistic insights into the intricate relationship between active site localization and catalytic performance, thereby advancing our fundamental understanding of site-specific catalysis in two-dimensional materials.
研究领域:
材料科学
·
催化化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Liming Zhu,Dezhu Sun,Xuyang Li,Wei Liu,Jiaqiang Huang,Caihang Liang,Xiaokai Hu
Bismuth telluride and lead telluride are typical thermoelectric semiconductors that are metallized for electrical contacts before being assembled into devices. In this study, three iron-group metals of nickel cobalt iron, were chemically plated on n-type bismuth telluride as the prospective contact material for adhesion and barrier in soldering connection with copper. Aluminum was used as the sacrificial anode to ensure iron deposition. The sensitization in borohydride solution facilitated the subsequent plating of metals. The plating rates were determined by gravimetric method. The crystalline structure and morphology of films were characterized. Electrochemical polarizations were undertaken to compare the driving force among three plating reactions through the reduction of metallic cations and the oxidation of hypophosphite anions with the mixed potential theory. The heterojunction of bismuth telluride with copper was fabricated by reflow soldering with Sn 95 Sb 5 foil, and the interfacial resistivity was evaluated by multiple resistance measurements across the junction.
研究领域:
材料科学
·
电化学
·
热电学
✓ 已验证
DOI
高影响因子
ENERGY
·
2017
·
IF 4.52
Haijun Song,Kefeng Cai
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) functionalized Te (PF-Te) nanorods were in situ synthesized. A simple and efficient vacuum-assisted filtration method was employed to integrate the PF-Te nanorods with PEDOT:PSS to form PEDOT:PSS/PF-Te composite films. By varying the content of PF-Te nanorods, the Seebeck coefficient of the composites increases from 15.6 to 51.6 μV/K, while the electrical conductivity decreases from 1262 to 122.4 S/cm. A maximum power factor of 51.4 μW/mK 2 is obtained from a sample containing 70 wt% PF-Te nanorods at room temperature. An 8 single-leg flexible thermoelectric generator prototype was fabricated using the as-prepared PEDOT:PSS/PF-Te composite film containing 70 wt% PF-Te on a polyimide substrate with Ag electrodes. The prototype produced an output voltage of 2.5 mV at a 13.4 K temperature difference between human body and the environment.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Lu Wang,Fuqiang Fan,Wei Cao,Huaping Xu
Reactive oxygen species (ROS) play crucial roles in cell signaling and redox homeostasis and are strongly related to metabolic activities. The increase of the ROS concentration in organisms can result in several diseases, such as cardiovascular diseases and cancer. The concentration of ROS in biologically relevant conditions is typically as low as around tens of micromolars to 100 μM H2O2, which makes it necessary to develop ultrasensitive ROS-responsive systems. A general approach is reported here to fabricate an ultrasensitive ROS-responsive system via coassembly between tellurium-containing molecules and phospholipids, combining the ROS-responsiveness of tellurium and the biocompatibility of phospholipids. By using dynamic light scattering, transmission electron microscopy, scanning electron microscopy, and NMR spectra, coassembly behaviors and the responsiveness of the coassemblies have been investigated. These coassemblies can respond to 100 μM H2O2, which is a biologically relevant ROS concentration, and demonstrate reversible redox properties.
研究领域:
生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）