CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Hong Jia,Jie Wang,Wenwen Fu,Junhua Hu,Yu Liu
Metal-organic frameworks (MOFs) have been considered as the outstanding templates and precursors in synthesizing advanced cathode materials for supercapacitor. Herein, a novel hierarchical structure with hollow Co 9 S 8 polyhedrons welding on the top of MnCo 2 S 4 nanoneedles are rationally designed via a facile in-situ vulcanization approach. The unique morphology can provide more abundant reaction sites and ensure the efficient electron transport. Due to the synergistic effect between MnCo 2 S 4 and Co 9 S 8 , the hybrid electrode delivers a favorable specific capacity of 1100.5 F·g −1 at a current density of 1 A·g −1 in three-electrode system. Furthermore, an assembled asymmetric supercapacitor comprising MnCo 2 S 4 /Co 9 S 8 and activated carbon delivers a high energy density up to 45.8 W·h·kg −1 at a power density of 800 W·kg −1 . Moreover, the device holds more than 94.8% capacitance retention after 5000 cycles, demonstrating it could be a potential electroactive material for next-generation high performance energy storage device.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 4
·263
·
IF 3.504
Jin Liu,Huihui Gan,Hongzhang Wu,Xinlei Zhang,Jun Zhang,Lili Li,Zhenling Wang
Porous hollow Ga2O3nanoparticles were successfully synthesized by a hydrolysis method followed by calcination. The prepared samples were characterized by field emission scanning electron microscope, transmission electron microscope, thermogravimetry and differential scanning calorimetry, UV-vis diffuse reflectance spectra and Raman spectrum. The porous structure of Ga2O3nanoparticles can enhance the light harvesting efficiency, and provide lots of channels for the diffusion of Cr(VI) and Cr(III). Photocatalytic reduction of Cr(VI), with different initial pH and degradation of several organic substrates by porous hollow Ga2O3nanoparticles in single system and binary system, were investigated in detail. The reduction rate of Cr(VI) in the binary pollutant system is markedly faster than that in the single Cr(VI) system, because Cr(VI) mainly acts as photogenerated electron acceptor. In addition, the type and concentration of organic substrates have an important role in the photocatalytic reduction of Cr(VI).Keywords:Ga2O3;porous;Cr(VI);organic pollutants
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhengdao Li,Yan Xiong,Dongqin Bi,Qi Liu,Chuanyun Yang,Jia Zhang
To optimize the structure and composition of the metal oxide semiconductor is one of effective approaches to improve its gas-sensing performance. In this paper, Zn 2 SnO 4 solid octahedrons were first synthesized by a hydrothermal method , then converted to hollow structures with a shape preserved through a simple and practical acid etching process. Ultimately, the hierarchical ZnSnO 3 /Zn 2 SnO 4 hollow composite with porous structure was designed and prepared by in situ growth of ZnSnO 3 nanosheets on the surface of Zn 2 SnO 4 hollow octahedrons in the seed mediated wet-chemical way. It was found that through the structure evolution from solid octahedron to hollow structure, the sensitivity of gas sensor toward triethylamine (TEA) was visibly improved. Significantly, superior TEA-sensing properties, such as lower optimal working temperature, higher sensitivity, wider linear response range, more rapid response/recovery speed and more excellent selectivity were further achieved by decorating Zn 2 SnO 4 hollow octahedrons with ZnSnO 3 nanosheets. It was remarkable that the sensor based on hierarchical ZnSnO 3 /Zn 2 SnO 4 porous hollow octahedrons displayed long-term stability to TEA and anti-humidity property, suggesting its potential practical applications in detection of highly toxic TEA. The improved sensing mechanism on the strength of structure and composition evolution for the gas sensor was discussed in detail.
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Ye Qu,Yanzi Zhang,Yali Zhang,Jun Song,Zhaoen Liu,Weixing Rao,Yu Liu
The multi-component synergy of electrode materials and structural engineering are crucial for high-performance supercapacitors. Herein, a novel sandwich-like MXene@NiCo-layered double hydroxides (LDHs)/Co 9 S 8 nanostructure is rational synthesized, which with rich pores can significantly facilitate the diffusion of electrolyte ions and boost high charge transfer capability. Besides, the interaction forces between components promote the integration of multidimensional materials, and the resulting hybrid structure significantly improves the electrochemical efficiency through synergistic effects. Remarkably, the obtained MXene@NiCo-LDH/Co 9 S 8 composites exhibit a high specific capacitance of 808.0 F g −1 at a low current density of 1 A g −1 , the value is nearly 1.4 times MXene@NiCo-LDH (586.2 F g −1 ), as well as good rate capability (512.0 F g −1 at 10 A g −1 ). Besides, the fabricated supercapacitor device (MXene@NiCo-LDH/Co 9 S 8 //activated carbon) showed an outstanding energy density of 96.4 Wh kg −1 at 800 W kg −1 ), and good cyclic performance of 70.26 % capacitance retention even over 9000 cycles. This research may provide a promising strategy for developing two-dimensional layered materials as an electrode material in energy storage applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
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2022
·Vol. 27
·期 12
·3939
·
IF 4.927
Yazhou Qin,Fan Mo,Sen Yao,Yuanzhao Wu,Yingsheng He,Weixuan Yao
Porous noble metal nanomaterials have attracted extensive attention due to their high specific surface area and surface plasmon resonance effect. However, it is difficult to form porous structures due to the high mobility and low reduction potential of noble metal precursors. In this article, we developed a facile method for preparing porous Ag with a controllable structure at room temperature. Two kinds of Ag crystals with different porous structures were successfully prepared by using AgCl cubes as sacrificial templates. Through the galvanic replacement reaction of Zn and AgCl, Ag crystals with a sponge-like porous structure were successfully prepared. Additionally, using NaBH4as the reducing agent, we prepared granular porous Ag cubes by optimizing the amount of reducing agent. Both the sponge-like and granular porous Ag cubes have clean and accessible surfaces. In addition, we used the prepared two porous Ag cubes as substrate materials for SERS detection of five kinds of methamphetamine analogs. The experimental results show that the enhancement effect of granular porous Ag is better than that of sponge-like porous Ag. Furthermore, we probed the hot spot distribution of granular porous Ag by Raman mapping. By using granular porous Ag as the substrate material, we have achieved trace detection of 5 kinds of methamphetamine analogs including Ephedrine, Amphetamine, N-Methyl-1-(benzofuran-5-yl)propan-2-amine (5-MAPB), N-Methyl-1-(4-methoxyphenyl)propan-2-amine (PMMA) and N-Methyl-1-(4-fluorophenyl)propan-2-amine (4-FMA). Furthermore, to achieve qualitative differentiation of analogs with similar structures we performed density functional theoretical (DFT) calculations on the Raman spectra of the above analogs. The DFT calculations provided the vibrational frequencies, Raman activities, and normal mode assignment for each analog, enabling the qualitative differentiation of the above analogs.Keywords:Ag crystal;methamphetamine;SERS;porous structure
研究领域:
化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hao Zhao,Baoyin Xu,Zhanhui Ding,Yanfeng Xue,Jing Yang,Wei Zhao,Yongfeng Li,Bin Yao,Hongdong Li,Yucheng Lan
Bismuth telluride is a widely used commercial thermoelectric material with excellent thermoelectric performances near room temperature. Reducing thermal conductivity is one of the most effective ways to improve performances of thermoelectric materials. In this study, the thermal conductivity of the material was reduced by fabricating porous structures. Highly dense NaCl-(Bi,Sb) 2 Te 3 composites were fabricated by a high-pressure technology. The NaCl phase was then removed from the composites by ultrasonic washing to produce porous structures. The produced (Bi,Sb) 2 Te 3 porous materials possessed excellent thermoelectric properties. The porosity and pore size of the (Bi,Sb) 2 Te 3 porous materials increased with the increasing NaCl content, decreasing the thermal conductivity significantly. An ultra-low lattice thermal conductivity of 0.21 Wm −1 K −1 at 493 K was achieved when the porosity was 39%, almost the lowest lattice thermal conductivity reported for (Bi,Sb) 2 Te 3 bulk materials. The figure of merit ZT value was enhanced to 1.05 at 493 K when the porosity was 25%. Compared with the most compacted samples ( ZT = 0.79 and porosity of 10%) prepared under the same conditions, the ZT value of the porous samples increased by 33%. This study indicated that porous thermoelectric materials can be prepared simply, quickly and efficiently by high-pressure/ultrasonication washing to improve thermoelectric performances, which has evident reference values for preparing other thermoelectric pore materials with enhancing behaviors.
研究领域:
材料科学
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热电学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
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2020
·Vol. 12
·期 4
·964
·
IF 3.426
Jianfeng Zhang,Shuxin Gong,Jiahang Zhu,Jiejing Zhang,Jing Liang
A cost-effective, simple, and time-saving method to fabricate mono-dispersed periodic microsphere structures on substrates with patterned sites is very meaningful due to their significance on various biological studies. Herein, a simple and facile method to fabricate mono-dispersed microsphere arrays on porous substrates was developed. The mixture of polystyrene and an organic stabilizer solution which contains aqueous solution, fabricated through shaking, was applied to prepare microemulsion solution. An ordered porous structure was produced by spreading and evaporating the solvent of microemulsion on a glass slide, accompanied by the enrichment of didodecylamine in the cavities. The porous cavities were further modified with polyacrylic acid and poly(diallyldimethylammonium chloride) which could immobilize the microspheres. The charged microspheres were incorporated into the cavities by an electrostatic interaction with the oppositely charged polyelectrolytes. The positive polyelectrolytes with abundant charges as well as a suitable content and dimension of microspheres, ensured the formation of mono-dispersed and ordered arrays. Considering that other charged particles were universally suitable for the present strategy, the reported approach opened an efficient way for the preparation of microsphere-based materials.Keywords:microemulsion;porous structures;mono-dispersed microsphere array
研究领域:
材料科学
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生物技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
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IF 4.7
Wenjuan Zhang,Hanhong Xu,Yuheng Li,Yaxian Wang,Xiangyue Yang,Youliang Wang,Henan Jia,Yongqian Shen,Wei Zhang,Tomasz Wejrzanowski
With the rapid advancement of digital and communication technologies, electromagnetic pollution poses an increasingly serious threat to the environment and precision instruments. In this study we report a three-dimensional MXene/PPy/Fe 3 O 4 (3D MPF) composite with an ordered three-dimensional network structure constructed by an in-situ self-assembly method. The porous structure of 3D MPF was adjusted to induce the assembly of MXene nanosheets through different EDA additions. The 3D MPF exhibits cross-linked and interpenetrating conductive networks that facilitate efficient electron transfer and reflection. The multi-layer heterogeneous interfaces and functional groups of the 3D MPF generate more polarization defects, causing significant reflection and scattering of incident electromagnetic waves. Moreover, the inclusion of Fe 3 O 4 supports magnetic loss and optimizes the impedance matching of the 3D MPF. The 3D MPF exhibits a maximum reflection loss of −55.21 dB at a thickness of 3.31 mm when the ratio of MXene to Fe 3 O 4 is 1:1. At a thickness of 1.41 mm, the effective absorption bandwidth reaches 3.44 GHz (from 13.84 GHz to 17.28 GHz). By adjusting the matching thickness, the effective absorption bandwidth of the 3D MPF ranges from 3.44 GHz to 18 GHz, with reflection losses below −10 dB, indicating its significant potential in electromagnetic wave absorption.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2023
·Vol. 24
·期 4
·4152
·
IF 5.6
Chao Jin,Zigang Wang,Chang Luo,Chunling Qin,Yongyan Li,Zhifeng Wang
As high-capacity anode materials, spinel NiFe2O4aroused extensive attention due to its natural abundance and safe working voltage. For widespread commercialization, some drawbacks, such as rapid capacity fading and poor reversibility due to large volume variation and inferior conductivity, urgently require amelioration. In this work, NiFe2O4/NiO composites with a dual-network structure were fabricated by a simple dealloying method. Benefiting from the dual-network structure and composed of nanosheet networks and ligament-pore networks, this material provides sufficient space for volume expansion and is able to boost the rapid transfer of electrons and Li ions. As a result, the material exhibits excellent electrochemical performance, retaining 756.9 mAh g−1at 200 mA g−1after cycling for 100 cycles and retaining 641.1 mAh g−1after 1000 cycles at 500 mA g−1. This work provides a facile way to prepare a novel dual-network structured spinel oxide material, which can promote the development of oxide anodes and also dealloying techniques in broad fields.Keywords:NiFe2O4;dealloying;porous;lithium-ion batteries
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Niandu Wu,Wenhua Zhao,Boye Zhou,Yizhang Wu,Wentao Hou,Wei Xu,Jun Du,Wei Zhong
Ti 3 C 2 T x (MXene) has intriguing application potential for supercapacitors. However, it usually suffers from self-accumulate and restack, resulting in the decrease of electrochemical active sites and low capacitance. Here, we demonstrated a 3D nitrogen-doped Ti 3 C 2 T x /rGO (NTG) foam which was synthesized through the multistep of gelation assisted with urea, freeze-drying, and thermal treatment processes. The decomposition of urea can not only change the morphology, bringing out more open marco- and microporous structures, but also improve the conductivity due to the nitrogen doping in the matrix. The 3D porous architecture can expose more electrochemical active sites, and thus accelerate the transport/diffusion of electrolyte ions. Consequently, the NTG foam possesses a high specific capacitance of 463 F g −1 , good rate performance, and outstanding cycling stability (90.8% retention after 10 000 cycles) in H 2 SO 4 electrolyte, showing enhanced performance of supercapacitors in comparison with pure Ti 3 C 2 T x and Ti 3 C 2 T x /rGO electrode.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
·
IF 2.829
Xiaomei Wang,Xiang Mao,Jianhan Huang
Herein two hierarchical porous hyper-cross-linked polymers modified with phenolic hydroxyl ( OH) groups were synthesized and their adsorption was comparatively evaluated using aniline as the adsorbate. The results reveal that the phenolic OH groups are helpful for the equilibrium adsorption due to the increased polar matching by formation of acid-base complex and hydrogen bonding , and the hierarchical porosity is favorable for the kinetic adsorption because the three dimensional continuous mesopores facilitate the rapid diffusion of aniline. The original aniline solution is optimum for the adsorption and the molecular state of aniline is preferable. The maximum equilibrium capacity is predicted to be 184.8 mg/g by the Langmuir model, and the enthalpy change, Gibbs free energy change , and entropy change are calculated to be negative. The adsorption can reach equilibrium within 60 min, the kinetic data obey the pseudo-second-order rate equation and the first step of the adsorption is mainly controlled by the intra-particle diffusion model.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Lien Zhu,Chunhong Zhang,Feifan Qin,Fuqiu Ma,Changlong Bi,Ruiqi Zhu,Lijia Liu,Jianwei Bai,Hongxing Dong,Toshifumi Satoh
To efficiently and economically extract uranium from seawater, novel amidoxime-modified hypercrosslinked poly(styrene-co-acrylonitrile) (SAN) adsorbents with tunable porous structure were synthesized via simple Friedel-Crafts reaction followed by amidoximation. The adsorbent HCPSAN-B-AO obtained by using biphenyl dichlorobenzyl (BCMBP) as an additional crosslinking agent, possessed a larger pore size and higher surface area due to the longer and more rigid molecular structure of BCMBP compared to the original crosslinking agent 1,2-dichloroethane (DCE), resulting in the higher uranium adsorption capacity of HCPSAN-B-AO. Investigations on the adsorption performance in real seawater containing a large amount of interfering ions showed that the adsorbent owned excellent selectivity for uranyl ions, and the removal percentage of uranium could reach 84.4%. Furthermore, the adsorbent maintained good adsorption performance even after 5 adsorption–desorption cycles, indicating a good recyclability. Investigations on adsorption kinetics, thermodynamics, adsorption isotherms and adsorption mechanism manifested that the adsorption was a rapid (adsorption equilibrium within 30 min), spontaneous and chemical adsorption process (maximum adsorption capacity was 228 mg g −1 ), and the mechanism was mainly the interaction between uranyl ions and amidoxime groups. In summary, the as-prepared adsorbent was a feasible adsorbent for uranium extraction from seawater.
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
危险品化学品经营许可证（带存储）