ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 22
·2100680
·
IF 18.808
Baoqiang Zhang,Qiangqiang Zhang,Peng He,Yanbin Ma,Lei Shen,Xingyi Zhang,Youhe Zhou
Superconducting YBa 2 Cu 3 O 7− x (YBCO) bulks have demonstrated promising applications in quasi-permanent magnets, levitation, etc. Recently, the applications of bulk superconductors have been proposed, such as in portable, ultralight superconducting devices. These applications require bulk superconductors with lightweight, complex morphology, and good processability. However, the traditional fabrication method of YBCO bulks requires prolonged supplemental oxygenation and produces limited geometries with many randomly distributed cracks. This, combined with the inherent brittleness of the ceramic material, seriously impedes its wide application. In this study, a YBCO bulk with a multiscale hierarchical geometric configuration is constructed by a direct-ink-writing-based 3D-printing process. The 3D-printed YBCO green bodies exhibit a robust structure after directional freezing, which promotes intimate contact between the precursor particles in the deposited layers. This technology offers the advantage of a low shrinkage of 13.6 vol% after sintering at 920 °C. The 3D-printed bulks show lightweight, highly crystalline, and good electromagnetic properties compared with those produced by traditional cold-pressed sintering. Importantly, the multilevel void structure with a large specific surface area significantly reduces the oxygenation time and retains superconductivity. The proposed 3D-printing process can be adopted for the industrial production of superconducting bulk with complex geometries for novel applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Dong Wenjie,Cai Ao,Wu Sui,Qi Beimeng,Dai Zhixi
A porous Sn–Er–Beta zeolite catalyst was rapidly prepared by introducing Sn source with water bath method and Er source with solid-state ion exchange method. When adding 180 mg catalyst, 225 mg glucose and 10 mL water into a reaction kettle at 200 °C for 2 h, the yield of lactic acid can reach 71.2%. After being recycled 5 times, the lactic acid yield of the catalyst can still reach 45.3%. The physical and chemical properties of Sn–Er–Beta zeolite were characterized, and it was confirmed that the catalyst had a multi-stage pore structure, with Sn and Er elements existing in the zeolite skeleton. Among them, the increase of Lewis acidity, Brønsted acidity and special strong alkaline sites of Sn–Er–Beta zeolite caused by the introduction of Sn, and the Lewis acidic sites are further increased after the introduction of Er. The combination of Sn and Er obviously improves the catalyst’s capability to catalyze glucose and fructose to produce lactic acid. This provides an important reference value for the directional catalytic process of sugars. Graphical abstract
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Bo Yin,Hai Tian,Haiyong He,Kam Loon Fow,Honglei Zhang,George Z. Chen,Di Hu
Biomass-derived carbon for supercapacitors faces the challenge of achieving hierarchical porous carbon with graphitic structure and specific heteroatoms through a single-stage thermal process that minimises resource input. Herein, molten base carbonisation and activation is proposed. The process utilises the inherent moisture of Moso bamboo shoots, coupled with a low amount of KOH, to form potassium organic salts before drying. The resultant potassium salts promote in-situ activation during single-stage heating process, yielding hierarchical porous, large specific surface area, and partially graphitised carbon with heteroatoms (N, O). As an electrode material, this carbon exhibits a specific capacitance of 327F g −1 in 6 M KOH and 182F g −1 in 1 M TEABF 4 /AN, demonstrating excellent cycling stability over 10,000 cycles at 2 A/g. Overall, this study presents a straightforward process that avoids pre-drying of biomass, minimises base consumption, and employs single-stage heating to fabricate electrode carbon suitable for supercapacitors.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 69
·41983-41992
·
IF 3.119
Xinxin Ji,Qian Li,Haoquan Yu,Xiaolin Hu,Yuanzheng Luo,Buyin Li
Lithium–sulfur (Li–S) batteries have attracted considerable attention due to their ultra-high specific capacity and energy density. However, there are still problems to be resolved such as poor conductivity of sulfur cathodes and dissolution of polysulfides in organic electrolytes. Herein, a novel ZIF-8-derived nitrogen-doped connected ordered macro–microporous carbon (COM-MPC) was developed by a dual solvent-assisted in situ crystallization method within a face-centered cubic stacking sphere template, which acts as an advanced sulfur host for enhanced Li–S battery performance. Compared with the conventional predominant microporous C-ZIF-8, the unique hierarchical macro–microporous structure with nitrogen doping not only renders polysulfide intermediates enhanced entrapment by confining the effect of micropores and chemisorption of doping N atoms, but also facilitates electrolyte accessibility and efficient ion transport owing to the ordered macroporous structure. Benefitting from this, the COM-MPC@S cathode delivers a high initial specific capacity of 1498.5 mA h g−1 and a reversible specific capacity of 1118.9 mA h g−1. Moreover, the COM-MPC@S cathode exhibits 82.3% of capacity retention within 10th to 50th cycle at 0.5C and a large capacity of 608.5 mA h g−1 after 50 cycles at a higher rate of 1C, and this enhanced cycling stability and rate capability demonstrate great practical application potential in Li–S battery systems.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Shaocun Liu,Qingping Lu,Chenhao Zhao
Paper cup composed of crude cellulose is a common waste in daily life. In this paper, hierarchical porous carbons have been successfully prepared by an initial hydrothermal treatment and subsequent activation route from abandoned paper cup, and then paper cup derived carbons are used as scaffolds to fabricate serial carbon/Se composites. The optimal composite presents unique 3D porous structure, with amorphous selenium uniformly confined into the micropores of carbon. As the cathode materials of Li-Se battery, this composite reveals an initial reversible discharge capacity of 517.2 mAh g −1 at 0.2C, and a capacity value of 431.9 mAh g −1 can be retained after 60 cycles. Even at a high rate of 4C, a capacity value of 295.8 mAh g −1 can be obtained. By comparison, the improved electrochemical performance of the optimal composite should be attributed to reasonable porous structure and effective encapsulation of amorphous selenium.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 58
·33872-33882
·
IF 3.049
Genxing Zhu,Qi Liu,Fengyi Cao,Qi Qin,Mingli Jiao
Dyes are typical water contaminants that seriously affect water quality. In this study, silkworm cocoon derived N, O-codoped hierarchical porous carbon was successively developed via a facile pre-carbonization and chemical activation method, and characterized thoroughly by SEM, TEM, HRTEM, XRD, Raman, N2 adsorption and XPS. The as-prepared N, O-HPC showed a well-developed porous structure with an ultra-high specific surface area of 2270.19 m2 g−1, which proved to be a high-efficiency adsorbent. Batch adsorption experiments demonstrated that MB adsorption was highly dependent on contact time, initial MB concentration, temperature and initial solution pH. However, no remarkable effects of humic acid and ionic strength were observed. In the kinetic studies, the good applicability of a pseudo-second-order kinetic model was demonstrated. The adsorption isotherm study showed that a Langmuir isotherm model can describe the experimental data much more suitably with a maximum monolayer adsorption capacity value of 2104.29 mg g−1, which is among the highest in previously reported adsorbents and ascribed to multiple adsorption mechanisms including pore filling, π–π stacking interaction and electrostatic interaction between MB and N, O-HPC. Thermodynamic analyses suggested that MB adsorption onto N, O-HPC was spontaneous and endothermic. Furthermore, the as prepared adsorbent showed highly efficient adsorption for MB in tap water and synergistic adsorption performance toward MB and MO. Therefore, N, O-HPC derived from silkworm cocoon could be considered as an efficient, novel and advantageous material for wastewater remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2024
·Vol. 5
·期 19
·7609-7616
·
IF 5.2
Mao-Hsuan Peng,Chia-Chen Li
The new adsorbent EDTA@PSV, which is a hierarchical porous microsphere modified with ethylenediaminetetraacetic acid, has demonstrated its effectiveness in extracting valuable metals. With a high surface area of 665 m2 g−1 and a large porosity of 90%, it exhibits significant potential for adsorbing Co2+, as supported by density functional theory simulations and experimental results.
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
Gas Science and Engineering
·
2023
·
IF 0
Guanhua Zhang,Shaocong Mo,Hongtao Xu,Xiaoyu Yan,Binlin Dou,Guomin Cui,Qiguo Yang,Wei Lu
Metal-organic frameworks (MOFs) are popular crystalline materials owing to their high porosity, tunable pore structure, and large surface area. By introducing a carboxylic acid to compete with 2,5-dihydroxyterephthalic acid for magnesium ions in solution, a crystal defect method was used to prepare multi-level pore Mg-MOF-74 with an unregular framework structure of Mg-MOF-74 in this paper. In the prepared samples, the adsorption amounts varied in descending order with various carboxylic acid species: Mg-MOF-74-Propionic acid (37.95 cm 3 /g STP) > Mg-MOF-74 (15.46 cm 3 /g STP) > Mg-MOF-74-Acetic acid (9.19 cm 3 /g STP) > Mg-MOF-74-Formic acid (7.81 cm 3 /g STP). At 1.5 kPa, the CO 2 adsorption of 2,5-dihydroxyterephthalic acid and propionic acid with a ratio of 2:1 can reach 2.78 cm 3 /g STP (standard temperature and pressure) with the comparison to 0.47 cm 3 /g STP of pristine Mg-MOF-74. Under atmospheric pressure, the adsorption capacity of modified Mg-MOF-74 can reach 37.95 cm 3 /g STP, equivalent to 2.45 times of the original Mg-MOF-74.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
ChemCatChem
·
2018
·Vol. 10
·期 20
·4555-4561
·
IF 4.674
Xiaoguang Liang,Ruoting Dong,Dapan Li,Xiuming Bu,Fangzhou Li,Lei Shu,Renjie Wei,Johnny C. Ho
Graphical A hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports is developed for the deposition of Ni−B nanoparticles by using the facile dip-coating method. This synergistic hybrid electrocatalyst system configured of Ni−B nanoparticles, Ni(OH) 2 nanosheets and Ni foam can exhibit dramatically electrocatalytic activities and superior long-term stabilities towards oxygen evolution reaction. Earth-abundant and highly-efficient electrocatalysts for oxygen evolution reaction (OER) are urgently desired to realize the large-scale storage and conversion of renewable energies. In this work, we develop a hierarchical porous electrocatalyst structure utilizing Ni(OH) 2 nanosheets directly synthesized on Ni foam as the conductive and interconnected supports. By coupling with amorphous Ni−B nanoparticles, this hybrid catalyst exhibits dramatically enhanced electrocatalytic activities and durabilities towards OER. In specific, along with the optimized Ni−B loading, this catalyst requires only an impressively small overpotential of 300 mV to drive a current density of 100 mA cm −2 for oxygen evolution in 1 M KOH electrolyte. Meanwhile, it also yields a small Tafel slope of 49 mV dec −1 and a superior long-term stability. All these results evidently indicate that the hierarchical hybridization of Ni−B with Ni(OH) 2 on Ni foam can effectively synergize the oxygen evolution, opening up a new vista for designing high-performance transition metal-based nanostructures in the field of electrochemical water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Minmin Gou,Ruili Guo,Hengheng Cao,Weifang Zhu,Fu Liu,Zhong Wei
Mixed matrix membranes (MMMs) for separating CO 2 /CH 4 mixture were prepared through incorporating Cu@Al(bpydc) into a Pebax polymer in which Cu@Al(bpydc) synthesized through a competitive coordination method achieved a controllable micro/mesopores structure and abundant functional sites for CO 2 . The hierarchical pores of Cu@Al(bpydc) provided multidimensional diffusion channels in the Pebax matrix, which increased the diffusion of CO 2 . In addition, the abundant chemical groups, such as the polar group COO – and nitrogen Lewis basic groups, created a microenvironment with multiple CO 2 affinity sites in the membrane, increasing the selectivity of CO 2 . A MMM loaded with 5 wt% Cu@Al(bpydc) exhibited excellent CO 2 separating property under wet mixed-gas test conditions. In particular, the CO 2 permeability and selectivity of the MMMs were increased by 92.90% and 27.10% respectively, compared with those of pure Pebax, showing exceptional potential for the separation and capture of CO 2 from biological natural gas.
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
·
2022
·
IF 9.136
Pingping Dong,Xiaoxu Jing,Yungui Li,Yi Shen,Qingqing Li,Qile Fang
Phosphorus (P) discharge is well recognized as the chief culprit of eutrophication and algal blooms. It is of pressing need to remove excessive phosphorus to protect the important watershed. Lanthanum (La) based materials are one type of attention-grabbing adsorbent due to their superior affinity to phosphate. Here, a La-Fe cyanometallate (CM) framework with a novel “twin lotus flower” structure was synthesized and rich hierarchical pores were fabricated via pyrolysis. The resultant “twin lotus flower” oxide of LaFe CM-500 was demonstrated to be a high-performance adsorbent for phosphate removal with a saturated capacity as high as 45.03 mg P/g. It also possessed superior removal ability for the stubborn low concentration of P pollution. The abundant hierarchical pores (from macropore to micropore) render a rapid diffusion of phosphate on the LaFe CM-500. The La components on porous adsorbent were verified to be the key active sites that form stable LaPO 4 via a ligand exchange process. The effects of solution conditions (temperature, pH, co-existing ions, and humic acid) were also investigated, and a high selectivity for phosphate adsorption enables the as-prepared “twin lotus flower” adsorbent to be competitive in practical water body treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Changjiang Liu,Hu Zang,Xin Liu,Haiyan Lu,Nan Yu,Baoyou Geng
Copper-based catalysts demonstrate distinctive multicarbon product activity in the CO2 electroreduction reaction (CO2RR); however, their low selectivity presents significant challenges for practical applications. Herein, we have developed a multilevel porous spherical Cu2O structure, wherein the mesopores are enriched with catalytic active sites and effectively stabilize Cu+, while the macropores facilitate the formation of a “gas–liquid–solid” three-phase interface, thereby creating a microenvironment with an increasing water concentration gradient from the interior to the exterior. Potential-driven phase engineering and protonation synergistically optimize the reaction pathway, facilitating a switch between CO and C2H4. At a low current density of 100 mA cm–2, the faradaic efficiency (FE) for CO reaches an impressive 96.97%. When the current density increases to 1000 mA cm–2, FEC2H4 attains 53.05%. Experiments and theoretical calculations indicate that at lower potentials, the pure Cu2O phase diminishes the adsorption of *CO intermediates, while weak protonation inhibits hydrogen evolution reactions, thereby promoting CO production. Conversely, at more negative potentials, the Cu0/Cu+ interface and strong protonation generate locally elevated concentrations of *CO and *COOH intermediates, which enhance C–C coupling and deep hydrogenation, ultimately improving selectivity toward C2+ products. This study provides novel insights into the rational design of copper-based catalysts for customizable CO2 electroreduction products.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）