KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Li Min Qian,Jie Zhou,Chu Zheng,Di Chen,Bi Shen,Yong Kun Liu,Li Xiao Wang,Yan Hua Tong
Cu2O, a p-type semiconductor, has broad potential applications, especially as a visible-light photocatalyst. This paper presents a simple water-bath reflux to prepare Cu2O micro/nanoparticles. The morphology evolution from intact octahedrons to surface-pitted spheres was obtained by adjusting reducing agent and additive. Reflectance spectra show similar photo-absorption intensity and the same range from 250 nm to 650 nm. However, they perform different photocatalytic activity. Intact octahedron has the best photodegradation ability and next is vertex-and edge-damaged octahedron, the lowest for vertex-free polyhedrons and surface-pitted spheres. The enhanced photocatalytic activity for intact octahedrons should to be attributed to its surface characteristics of high index. Our study not only provides a simple method for controllable preparation of Cu2O micro/nanoparticles with different morphologies but also confirms the effect of morphologies on photocatalytic activity.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
RSC Advances
·
2025
·Vol. 15
·期 23
·18022-18033
·
IF 4.6
Xiyang Zhou,Li Yu,Xu Li,Weizhou Jiao,Ruixin Wang
It is well-known that defect engineering and morphology engineering are key strategies for giving an impetus to the catalytic activity of catalysts. This study reports the successful regulation of oxygen vacancy (OV) defects and the morphology of a Keggin-type silicotungstic acid (SiW12)-loaded N-doped carbon (NC) matrix, which is obtained by calcining a copolymer of acryloyloxyethyl trimethyl ammonium chloride (DAC) and acrylamide (AM) as precursors in air. It was unveiled that adjusting the proportion of AM in the copolymer could be simultaneously conducive to the targeted regulation of OV defects of catalysts and their morphological evolution from bowls to spheres. The as-prepared OV-SiW12/SNC sphere catalyst showed an excellent oxidative desulfurization (ODS) performance with H2O2 as a green oxidant. Complete removal of DBT (2000 ppm) was achieved within 12 minutes at 60 °C with a large rate constant of 0.4055 min−1. The outstanding ODS performance was critically ascribed to the highly active W sites promoted by the abundant OV defects, and the easy diffusion and contact between the substrate and W sites were led by the spherical structure. Moreover, the as-prepared catalyst exhibited prominent reusability. This ODS reaction was found to follow a HO˙ radical mechanism.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yiqing Lu,Zhimin Zou,Yu Bai,Xin Wang,Hongwang Zhang,Chunhai Jiang
Commercialization of SiO/graphite (SiO/G) composite anode material has been partially conducted in modern-model Li-ion batteries but is still limited by its relatively high cost and inferior stability. Improving the Li-ion storage performance as well as lowering the manufacturing cost of SiO/G anode has been the ongoing target of many studies. Herein, a low cost SiO/G anode with good Li-ion storage performance is developed by facilely integrating SiO nanoparticles into spent graphite (SG) extracted from used LiFePO 4 batteries. The loose SG particles after repeated charge/discharge cycles can be easily exfoliated and combined with the SiO nanoparticles during the mechanical ball-milling treatment. Further processing the composite into spherical structure by spray-drying and pyrolysis results in practically applicable anode materials. The SiO/SG/C anode with a SiO mass ratio of 30 % exhibits the best overall performance including an excellent rate capability (385 mAh g −1 at 3 A g −1 ) and encouraging cycle stability (442 mAh g −1 after 300 cycles at 1 A g −1 ). The coin-type full cells coupling the pre-lithiated spherical SiO/SG anode and NCM811 cathode delivers a high energy density of 461 Wh kg −1 (based on the active masses of both electrodes) and good cycle performance (74.4 % capacity retention at 0.5C after 100 cycles). This work not only provides a high performance yet low cost SiO/G anode material, but explores a high value added way for the reuse of SG, thus can practically push forward the development of LIBs .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Results in Chemistry
·
2022
·
IF 0
Deqing Chu,Yundalai Wu,Limin Wang
Bismuth oxide, a widely studied semiconductor material, has been discovered in a variety of forms. Novel coral spherical α-Bi 2 O 3 with a diameter of 2–4 μm was successfully prepared by a simple template-free and surfactant-free hydrothermal method. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission electron scanning microscopy (FESEM), energy dispersive spectroscopy (EDX) and transmission electron microscopy (TEM). The experimental results revealed that the reaction time and the urea concentration could regulate the morphology of Bi 2 O 3 , and a possible formation mechanism was proposed based on the results. This study provides a new idea for the morphological synthesis of bismuth oxide.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
CRYSTENGCOMM
·
2019
·Vol. 21
·期 41
·6136-6144
·
IF 3.382
Han Gao,Xiaolu Yao,Ming Huang,Jialin Cai,Zhirong Suo,Guan Luo
In this study, a self-assembled spherical shell and porous spherical structures of 3,3′-diamino-4,4′-azoxyfurazan (DAAF) were fabricated by a simple surfactant-induced and a solvent-induced method, respectively. Scanning electron microscopy (SEM) was employed to characterize their morphology. The results of X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy indicated that the crystal and molecular structures of both products remained unchanged when compared with the case of raw DAAF. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were employed to characterize the thermal behavior of the as-prepared crystals, and the related thermodynamic parameters were calculated. Finally, the self-assembly mechanism has been discussed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2022
·Vol. 29
·期 2
·110-119
·
IF 0
Zhang Zongping,Xu Jie,Zhang Dongmei,Ma Huijuan,Li Tao,Xiao Ting,Pei Cunyuan,Ni Shibing
The safe operating voltage and low volume variation of Li 3 VO 4 (LVO) make it an ideal anode material for lithium (Li)-ion batteries. However, the insufficient understanding of the inner storage mechanism hinders the design of LVO-based electrodes. Herein, we investigate, for the first time, the Li-ion storage activity in LVO via Cl doping. Moreover, N-doped C coating was simultaneously achieved in the Cl doping process, resulting in synergistically improved reaction kinetics. As a result, the as-prepared Cl-doped Li 3 VO 4 coated with N-doped C (Cl-LVO@NC) electrodes deliver a discharge capacity of 884.1 mAh/g after 200 cycles at 0.2 A/g, which is the highest among all of the LVO-based electrodes. The Cl-LVO@NC electrodes also exhibit high-capacity retention of 331.1 mAh/g at 8.0 A/g and full capacity recovery after 5 periods of rate testing over 400 cycles. After 5000 cycles at 4.0 A/g, the discharge capacity can be maintained at 423.2 mAh/g, which is superior to most LVO-based electrodes. The Li-ion storage activity in LVO via Cl doping and significant improvement in the high-rate Li-ion storage reported in this work can be used as references for the design of advanced LVO-based electrodes for high-power applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Jianjian Zhang,Shuai Bai,Jingjing Lyu,Xinchun Guan
The traditional superabsorbent polymers (SAPs) are usually irregular particles prepared from petroleum derivatives. Additionally, they often encounter issues such as premature water desorption and inadequate water absorption when applied in cement-based materials. This research synthesized a spherical starch-based superabsorbent polymer (SSSP) with stable water absorption using inverse suspension polymerization, analyzed the influencing factors, adsorption-desorption performance and microstructure of SSSP, and investigated its influence on the cement paste. The results indicate that, the factors affecting the sphericity of SSSP are stirring speed, N 2 flow rate, dosage of suspending agent, and the mass ratio of organic phase to aqueous phase in sequence. The water absorption and water storage of starch-based SAP are 2.8 times and 1.4 times higher than those of traditional petroleum-based SAPs. The salt (alkaline) resistance of SSSP is enhanced by grafting stronger hydrophilic –SO 3 H and non-ionic –CONH 2 groups, with the former being more readily grafted onto starch. The dried SSSP particles exhibit a smooth surface with a sphericity of 0.98, forming spherical hydrogels upon water absorption. SSSP mitigates 75 % of the autogenous shrinkage of cement paste, with a compressive strength 8.6 % lower than the control group, but still higher than that of other SAP pastes. The voids formed by SSSP desorption are mainly spherical, containing hydration products inside, and the pore distribution in its paste tends towards a smaller scale, with a higher proportion of high-density and ultra-high-density C–S–H.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yang Li,Qiao Yin,Yingshan Zeng,Zhi Liu
The core of realizing the effective CO 2 conversion by solar energy is to develop a stable photocatalyst with high CO 2 adsorption capacity and high charge separation efficiency. In this work, a hollow spherical Z-scheme SnS 2 /g-C 3 N 4 /C (SCC) photocatalyst is successfully constructed by a morphology-inherited strategy. Biomass mabospores are utilized as both the precursor for formation of hollow spherical structure and carbon source, and the g-C 3 N 4 and SnS 2 nanosheets tightly anchor on the surface of mabospores-derived carbon spheres. The Z-scheme SCC heterostructure exhibits 5.5 times activity enhancement on CO 2 photoreduction to CO with a high evolution rate up to 40.86 μmol∙g −1 ∙h −1 . Examined by various photoelectrochemical analysis, the boosted photocatalytic activity originates mainly from the construction of hollow spherical Z-scheme heterojunction, providing the more preferable basic sites for CO 2 adsorption, promoting the separation efficiency of electron-hole pairs, as well as increasing the reductionability of electrons in conduction band of g-C 3 N 4 . The formed internal electric fields between the g-C 3 N 4 and SnS 2 can also further reinforce the spatial separation of photogenerated charge carriers. Theoretical calculations further verify that the SCC Z-scheme heterostructure can effectively decrease the energy barriers of formed intermediates, especially the crucial COOH*, and thus leading to the facile conversion of CO 2 -to-CO. This work induces a new strategy to construct g-C 3 N 4 -based Z-scheme heterojunction assisted by versatile biomasses with optimized structure and enhanced photoelectrochemical merits for efficient CO 2 conversion into chemical fuels.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuhang Yang,Chuanwen Zhao,Pengxin Zeng,Yuhao Wang,Xue Qin,Yueyue Gao,Yafei Guo,Ruilin Wang,Jian Sun
Suitable molding and granulation methods are crucial, and an outstanding sphere structure can play a better role in the future scale-up industrial application of K 2 CO 3 -based CO 2 adsorbent. Water will form a large contact angle on the surface of hydrophobic solution and become sphericity water. In this work, hydrophobic powders (polyethylene (PE), TiO 2 , and SiO 2 ) were selected in the hydrophobic interface-assisted method. The CO 2 adsorption capacity of TiO 2 pellets is 0.50 mmol/g, while that of PE pellets is 0.24 mmol/g, and finally that of SiO 2 pellets is 0.36 mmol/g. Then, experiment proved that high temperature (>500 ℃) makes the hydrophobic powders (i.e, TiO 2 and SiO 2 ) lose hydrophobicity which make water molecules diffuse faster, while PE is completely decomposed at high temperature. Compared with the pellets calcined at 300 ℃, the TiO2 pellets calcinated at 500 ℃ have an adsorption capacity of 0.70 mmol/g, which is over 1.72 times that of the original pellets, and the other two hydrophobic surfaces are also improved to some extent. Additionally, the appropriate ratio of low-temperature pore forming agent (i.e., urea) can help improve the adsorption performance, while excessive addition will lead to poor CO 2 adsorption performance. In addition, the K 2 CO 3 /Al 2 O 3 pellets also exhibited desirable mechanical properties, with an optimal compressive strength of 41 Mpa. Therefore, the loss of hydrophobicity leads to more active diffusion of water molecules, which may provide a new idea for the future development of CO 2 adsorbents and other areas.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zizun Tian,Qianqiao Chen,Qin Zhong
Honeycomb spherical metallic 1T-MoS 2 was fabricated as an efficient counter electrode (CE) for quantum dot sensitized solar cells (QDSSCs) via facile hydrothermal method using environment-friendly F127 as soft templates. Electrochemical tests show that the interface charge transfer resistance ( R ct ) of 1T-MoS 2 is only 0.66 Ω with 3% template, demonstrating its superior electrocatalytic activity for S n 2− reduction. The power conversion efficiency of QDSSCs assembled with Ti-mesh substrate MoS 2 CEs reached 6.03%. The outstanding performance is mainly ascribed to the unique morphological advantage and intrinsically excellent conductivity, catalytic activity and hydrophilicity of 1T-MoS 2 . The honeycomb spherical 1T-MoS 2 increases the specific surface area and provides rich catalytic active sites and electrolyte transport channels, also enhances the stability of 1T-MoS 2 . The experimental results reveal 1T-MoS 2 is expected to be a competitive CE material for efficient QDSSCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Yunfei Liu,Liying Wang,Guohua Chen,Xin Miao,Gaoqi Wu,Zhenzhu Cao,Yongfeng Zhang
Spherical, controlled-morphology porous nitrogen-containing bimetal oxides (CoO–ZnO@NC-450) were produced. Firstly, the spherical CoZn-BTC@NC precursor with nanoparticles on the surface was prepared by hydrothermal method with 1,3,5-benzenetricarboxylic acid as ligand, Co 2+ and Zn 2+ as metal sources, and polyvinyl pyrrolidone and urea solution with a concentration of 0.1 mol/L added. Then, various nitrogen-containing bimetallic oxide composites were created by calcining the metal–organic framework precursor at 350, 450, and 550 °C in an argon environment. When used as anode material, CoO–ZnO@NC-450 exhibited high cycle stability; at a current density of 0.2 A g −1 , its initial discharge specific capacity was 975.2 mAh g −1 , and remained at 796.2 mAh g −1 and after 100 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Wang Deping,Hu Wenming,Fan Wufeng,Xia Xiaohong,Liu Junqiang,Liu Hongbo
Metal-organic frameworks (MOFs) have attracted numerous attentions as anode materials for lithium-ion batteries (LIBs) owing to their unique tunable structures. However, utilizing MOFs in electrochemical devices has been hampered by the inferior electrical conductivity and poor stability that dominate the cycling stability and rate performance of electrodes. Herein, a Ni-PTA/graphene hybrid with porous spherical structure has been successfully constructed by interconnected needle-like Ni-MOFs nanocrystals after the introduction of amine functionalized graphene (NG). The conductivity and structural stability of the composites have been greatly improved due to the chemical bonds formed between the N -containing graphene and the MOFs. When used as anode materials for LIBs, the synthesized Ni-PTA/NG composite shows a superior Li storage with a reversible capacity of 1585 mAh g −1 at a current density of 200 mA g −1 . In addition, Ni-PTA/NG composite demonstrates an ameliorative rate performance (340 mAh g −1 at 5 A g −1 ) and long-term cyclability (570 mAh g −1 at 1 A g −1 after 420 repeated cycles), significantly higher than traditional graphene/MOF composite materials. The novel method in this work paves a new way to form 3D structure by using NG to induce MOF germination, which may be extended to preparing other metal/metal oxides materials for electrochemical energy-storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）