JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuchun Li,Jiachen Liu,Tianle Gong,Changzhi Liang,Lin Li,Xuemei Lin,Zongrong Ying,Huangyan Liu
2D material MXene is one of the most interesting electrode materials due to its vast range of potential applications in electrochemical energy storage and conversion in recent years. Herein we fabricated a novel 2D MXene-based composite electrode material by using hydrothermally synthetized CuS and carbon dots (CDs) to synergistically decorate Ti 3 C 2 T x . The introduction of CuS and CDs increases the interlayer spacing of Ti 3 C 2 T x , which reduces the stacking of Ti 3 C 2 Tx unfavorable to the electrochemical performance. The optimal C-Ti 3 C 2 T x /CuS composite electrode has an excellent specific capacitance of 1186 F·g −1 at a current density of 1 A·g −1 , which is much higher than that of Ti 3 C 2 T x samples decorated with single CuS or with single CDs, illustrating that CuS and CDs have the outstanding synergistic improvement effect to MXene on the electrochemical performance. When the current density rises to 10 A·g −1 , the sample still maintains a capacitance of 907 F·g −1 , corresponding to a capacitance retention rate of 76.5%. After 1000 cycles at a current density of 1 A·g −1 , the capacitance remains 67% of the initial value. These demonstrate that the C-Ti 3 C 2 T x /CuS composite electrode material has a great promising practical potential in fabricating high-performance supercapacitors. The new finding about the outstanding synergistic effect of CDs and transition metal compounds on improving MXene’s electrochemical performance suggests a possible effective way for preparing the high-performance MXene-based electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Han Hu,Chen Lin,Qingyang Luan,Xiaoyu Jiang,Xiaoqin Zhang,Qianfeng Wang,Yunxiao Dong,Jing Wei,Jinggang Wang,Jin Zhu
Biodegradable polymers tend to undergo relatively slow degradation under natural conditions, facing challenges in ecofriendly applications. The copolymerization modification of the amorphous region of aliphatic–aromatic copolyesters has become an effective method to juggle outstanding comprehensive performance and adjustable degradation. Herein, a series of poly(butylene succinate diglycolate terephthalate) (PBSDT) copolyesters were successfully prepared, realizing synergistic modification of the amorphous phase with diglycolic acid and succinic acid. In detail, PBS40D10T to PBS10D40T were designed to explore the differences in molecular characteristics and properties. We find that the similarity of these two segments reflected in segmental rigidity and domain size, also displaying comparable melting temperature and mechanical properties. The PBSDT copolyesters exhibited higher melting temperature (>141 °C), elastic modulus (>120 MPa), and tensile strength (>25 MPa) than commercial PBAT. Their gas barrier performance achieved 20 times better than PBAT and 4 times better than PLA, also being superior to that of PBAT/PLA blends. The differences of two comonomers were mainly attributed to the oxygen heteroatom of diglycolic acid, reflected in the hydrophilicity and stronger intermolecular interactions, which significantly influenced their crystal growth rate and environmental degradation. Especially, the isothermal crystallization rate (minimum t1/2 < 15s) was the fastest among reported aliphatic–aromatic copolyesters. In addition, the degradation behavior clarified that the preferentially depolymerized diglycolate can be a decisive factor in controlling the degradation rate. Remarkably, synergistic modification by diglycolic acid and succinic acid endowed the access to enhanced hydrolytic degradability in a natural environment, without sacrificing the thermal, mechanical, and gas barrier properties. This work provides a new direction for the high strength-toughness green packagings and alternatives to PBAT with tunable degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Shengxin An,Shuaibo Zhao,Jingting Jin,Tao He,Yuhao Wang,Na Kong,Jie Zhou,Wenzhi Li
Great expectations have been placed on bimetallic co-modified zeolite for the direct oxidation of methane to methanol. In this work, H-ZSM-5 zeolite was modified with bimetallic copper and zinc via ion-exchange method. Numerous experiments were conducted and the methanol yield of 44,302.70 μmol·g cat −1 ·h −1 was obtained over 1Cu/2Zn-ZSM-5 catalyst. A series of characterization analyses confirmed that the introduction of Zn increased the proportion of active Cu species bound to extra-framework oxygen by altering the electronic state of copper. The bis (μ-oxo) dicopper ligand was identified as the active site for methane oxidation. The possible reasonable reaction pathway was the free radical reaction. This work provides a valuable guidance for the preparation of co-modified zeolite catalysts for the direct oxidation of methane to methanol.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 67
·期 4
·e17138
·
IF 3.519
Zheng-Jun Fu,Zhen-Yuan Wang,Mei-Ling Liu,Jing Cai,Pu-An Yuan,Qian Wang,Weihong Xing,Shi-Peng Sun
Nonpolar solvent separation is widely used in petroleum, chemical, food industries, but traditional separation methods consume intensive energy. State-of-art organic solvent nanofiltration membranes require complex modifications for nonpolar solvent transport. For the first time, we propose the concurrent modification of the surface, interface and support layer of dual-layer membranes with three additives (perfluorodecylamine, fluoro substituted aromatic amine, silica nanoparticles) in a one-step cocasting process. A delamination-free dual-layer membrane was obtained with a hierarchical hydrophobicity and transport channels. The novel designed structure elevated the pure n-hexane permeance (28.75 L m −2 hr −1 bar −1 ) by 3 orders of magnitude with a high lecithin rejection (98.7%). This method of synergistically controlling the hierarchical structures and properties of dual-layer membranes can significantly shorten the preparation process of high-performance nonpolar solvent nanofiltration membranes.
研究领域:
材料科学
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分离技术
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化学工程
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 48
·e202301171
·
IF 2.1
Xinyu Wang,Lu Zhang,Guojun Yuan,Jianliang Bai,Yaqing Zhu,Lili Ren
Graphical The mechanism diagram demonstrates that the hydrodechlorination (HDC) reaction of carbon, oxygen co-doped MoP catalyst for trichloroethylene (TCE) shown as the above. Trichloroethylene (TCE) plays an important role in industrial production. However, humans are now suffering the effects of trichloroethylene being released directly into the environment. Therefore, it is urgent to explore effective methods for the degradation of trichloroethylene. Hydrodechlorination (HDC) reaction is considered a green, beneficial and promising technology due to its high selectivity, environmental tenderness and product recovery. Noble metal catalysts are considered as the benchmark catalysts for catalytic processes, but their wide application is limited by their low abundance and low stability. Phosphide has been paid more and more attention in HDC field because of its excellent catalytic performance. In view of the important role of O in the catalytic process, the preparation of C, O co-doped MoP was realized through the co-modification of EDTA and glucose. In the case of changing the molar ratio of MoP to the surface modifier, MOP−C−O (50 %) can achieve the best catalytic efficiency. Even compared with some reported catalysts, it has a very large catalytic advantage. In summary, the C, O co-doped MoP catalyst proposed in this paper provides guidance for the preparation of the same type of catalyst. The harms caused by organic chlorides to the human body and the environment make the problem of how to degrade organic chlorides particularly urgent. Phosphides have gradually attracted attention in HDC due to their high catalytic performance. In view of the important role of O in catalytic process, the preparation of C, O co-doped MoP was achieved by the synergistic modification of EDTA and glucose. Compared with unmodified MoP, the doping of carbon and oxygen in MoP−C−O ensure that more active sites are exposed on the surface. At the same time, the high dispersion of MoP on the carbon matrix increases the specific surface area of MoP−C−O, which is more conducive to the adsorption of reactants on the surface, thereby effectively improving the catalytic activity of the modified MoP−C−O. In the case of changing the molar ratio of MoP and surface modifier, the best activity of MoP−C−O (50 %) reaches 57.80 %, which is 2.3 times higher than that of MoP catalyst.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hua Yan,Yu-hong Luo,Ying Lei,Qing-lin Pan,Jun-chao Zheng
N ickle (Ni)-rich layered oxides as promising candidate of high-capacity cathode materials have aroused extensive concern primarily regarding their higher specific capacity. However, the major hurdle of Ni-rich cathodes (Ni content ≥0.7) is their poor cycling stability, which often suffers from the release of oxygen, structural degradation and increased impedance during cycling, especially at high voltage or high temperature. Herein, we demonstrated a feasible solid phase method for easy industrialization based on the Al 3+ /Zr 4+ co-doping in LiNi 0.72 Co 0.05 Mn 0.23 O 2 (A X Z Y -NCM) single-crystal cathode. The optimized A 0.5 Z 0.5 -NCM single-crystal material exhibited greatly enhanced structural and thermal stability. XRD refinement results indicated that both Al 3+ and Zr 4+ were mainly located in transition metal (TM) sites, strengthening the layered structure through strong M-O bonds and inhibiting cation mixing. In-situ XRD revealed that the synergistic rivet effect of Al/Zr co-doping alleviates anisotropic lattice stress-strain during charge/discharge process. Accordingly, the A 0.5 Z 0.5 -NCM cathode can output a high initial capacity of 177.3 mAh g −1 at 1 C, and captured a more desirable capacity retention of 85.10 % than that of U-NCM (74.33 %) at 1 C over 200 cycles. Even at a high voltage of 4.5 V, its capacity retention can still reach 82.37 %, significantly surpassing the unmodified U-NCM (31.0 %). The above results demonstrated that well-designed dual doping is highly effective for strengthen structure stability and cycling performance of Ni-rich cathodes.
研究领域:
材料科学
·
电化学
·
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）