Journal of Materials Chemistry C
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2022
·Vol. 10
·期 48
·18164-18173
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IF 8.067
Weifeng Kong,Zipeng Xing,Hang Zhang,Bin Fang,Yongqian Cui,Zhenzi Li,Peng Chen,Wei Zhou
A hollow polyhedral structure can effectively capture light and facilitate carrier separation, thus enhancing photocatalytic performance. Herein, hollow cubic CdS@CoS/WS2 dual S-scheme heterojunction superstructure photocatalysts are fabricated using a simple sulfidation and hydrothermal method. CdS@CoS/WS2 with a band gap of 1.59 eV and a relatively narrow band gap broadens the photoreaction to the near-infrared region and shows a good photothermal effect, which can promote photocatalytic reactions. It shows a relative specific surface area of 91.58 m2 g−1, which provides abundant surface-active sites to enhance the photocatalytic reaction. Under light conditions, the photocatalytic degradation ratios of CdS@CoS/WS2 for tetracycline and bisphenol A are up to 98.9 and 99.1%, and the hydrogen evolution efficiency is also up to 10.62 mmol h−1 g−1. The enhanced photothermal–photocatalytic performance could be due to the formation of a dual S-scheme heterojunction superstructure that facilitates space charge separation, a narrow band gap and a mesoporous hollow structure promoting solar light utilization, providing abundant surface-active sites and enhanced mass transfer. This simple strategy provides a new idea for the construction of high-performance hollow superstructure photocatalysts.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 17
·12987-12993
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IF 3.84
Yue Wu,Liguo Li,Wenyan Yang,Shengyu Feng,Hongzhi Liu
A series of hybrid nanoporous polystyrenes were synthesized from commercial polystyrene (PS) and cubic octavinylsilsesquioxane (OVS) via the Friedel–Crafts reaction. The porosity of the resulting hybrid polymers could be fine-tuned by varying the ratio of PS and OVS. The resulting polymers, HCP-1 to HCP-9 had apparent Brunauer–Emmett–Teller surface areas (SBET) in a range of 2.6 to 767 m2 g−1, with total pore volumes in the range of 0.36 to 0.90 cm3 g−1. The SBET was maximum when OVS loading was 9.1 wt%; it then decreased to almost no porosity before increasing again with the increase of OVS loading. The thermal decomposition temperatures of the hybrid polymers were close to pure PS under a N2 atmosphere, but the residues increased with the increase of OVS loading. The gas sorption applications revealed that HCP-3 possessed H2 uptake of 3.01 mmol g−1 (0.60 wt%) at 77 K and 1.01 bar and CO2 uptake of 1.12 mmol g−1 (4.93 wt%) at 298 K and 1.01 bar.
研究领域:
材料科学
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高分子化学
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纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Xuli Ding,Yangyang Huang,Guolong Li,Yang Tang,Xiaocheng Li,Yunhui Huang
Considerable attention has been paid to sodium-ion batteries (SIBs) for large-scale energy storage due to low cost and abundant Na source. Phosphorus (P) is proposed as a high-capacity SIB anode material with theoretical capacity of 2596 mAh g −1 . However, the large volume expansion of P during sodiation brings about a series of challenges, including rapid capacity decay and slow ion transport. In this work, we develop an amorphous P ( α P) anode material with cubic boron nitride (c-BN) as a mechanical skeleton wrapped by nanoporous graphene (pGra) networks, which can combine synergistically the advantages of pGra and c-BN, and hence simultaneously solve the challenges for the P-based anodes. The rigid nature of c-BN is effective to suppress the severe volume expansion during P sodiation process, while the porous network of pGra serves as transport channel for electrons and ions, offering short pathways for large-radii Na + ions diffusion. The α P/c-BN/pGra composite anode shows excellent cyclability with a stable specific capacity of ∼1000 mAh g −1 and ∼90% capacity retention after 100 cycles at a specific current of 50 mA g −1 . The rigid c-BN and flexible pGra provides a promising pathway for developing high performance alloy-based materials for low-cost SIBs.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 34
·20789-20794
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IF 3.108
Vikramjeet Singh,Tao Guo,Li Wu,Jianghui Xu,Botao Liu,Ruxandra Gref,Jiwen Zhang
Despite its 3D porous structure, the pharmaceutical applications of cyclodextrin based cross-linked polymers are limited due to their structural irregularities. To address this issue, a template-directed strategy is used to obtain cubic micro and nano cyclodextrin cross-linked polymer (CD-cubes) from cyclodextrin metal organic frameworks in this study. The well-organized γ-CDs in MOFs were crosslinked by diphenyl carbonate by a facile single step chemical reaction. Scanning electron microscopy and X-ray diffraction analysis revealed the almost perfect cubic shapes of the particles with a disordered internal structure. Contrarily to the non-crosslinked materials which immediately dissolved in water, the CD-cubes were remarkably stable after extensive washing with water. The CD-cubes possessed a mesoporous structure with pore size in the range of 2–4 nm and showed much higher BET surface and 8 times higher adsorption capacity for doxorubicin as compared to conventional cyclodextrin-sponges.
研究领域:
药学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Meiyun Feng,Zhiqiang Xu,Xue Bai,Kuangfei Lin,Meng Zhang
In this study, the morphology and surface characteristics of different M x Mn 3-x O 4 (M = Co, Zn, Cu, Fe; x = 1, 2) nanoparticles and their catalytic performance for peroxymonosulfate (PMS) activation to degrade trichloroethylene (TCE) were compared. The characterization results showed that a highly crystalline manganese structure was synthesized, and cubic spinel (M 2 MnO 4 ) and tetragonal spinel (MMn 2 O 4 ) were confirmed. The experimental results indicated that, compared with the tetragonal spinel catalysts, the cubic spinel catalysts exhibited higher PMS-specific catalytic activity and TCE removal efficiency due to the reduction in electron transfer resistance and the increase of the surface area. In addition, all the synthesized nanoparticles exhibited remarkable reusability, a low metal dissolution rate, and a wide applicable pH range (4 to 11) for efficient PMS activation . The free radical-scavenging experiments and electron paramagnetic resonance (EPR) analysis further verified the role of ∙HO and SO 4 ∙− in the removal of TCE and the large amount of stronger free radicals (SO 4 ∙− ) generated by the cubic spinels. This study revealed that stable cubic spinel nanoparticles can be synthesized at room temperature by adjusting the ratio of manganese and transition metals; these nanoparticles showed excellent catalytic performance for PMS activation. These research results are important for the synthesis of heterogeneous catalytic oxidation catalysts.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
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IF 0.847
Wei Fu,Jiajie Fan,Quanjun Xiang
ABSTRACT The production of renewable fossil fuels such as CH 4 and CO by photocatalytic CO 2 reduction has attracted more and more attention. However, single photocatalyst is less efficient for photocatalytic reduction of CO 2 due to the fast recombination of photogenerated electron pairs. Herein, we successfully prepare CdS-Ag 2 S composite by assembling the Ag 2 S QDs cocatalyst on the surface of CdS nanosheet-assembled flower through oil-bath solvothermal method . This composite is prepared through a simple self-assembly strategy using cadmium chloride, ammonia and thiourea as precursors of the CdS nanosheet-assembled flower and silver nitrate and 3-mercaptopropionic acid as the precursors of Ag 2 S QDs. The average diameter of Ag 2 S QDs is apparently 6.0 nm. The light absorption edge of the composite is at around 560 nm, with the corresponding band gap at 2.14 eV. The CdS-Ag 2 S QDs composite with 5 wt% Ag 2 S QDs loaded achieves CO evolution rate of 16.6 μmol•g −1 •h −1 without noble-metal cocatalysts. This strengthened photocatalytic performance and photocatalytic stability were attributed to the energy band broadening of Ag 2 S QDs caused by quantum size effect and the large specific surface area due to the assembled flower. The mechanism underlying the enhanced photocatalytic CO 2 reduction activity is further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nanotechnology Reviews
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2021
·Vol. 10
·期 1
·1349-1358
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IF 7.848
Xiaodong Chen,Zhong-Tao Yang,Nannan Wang,Xin Gao,Gang Wang,Chunyu Song,Yunfeng Liu,Lifeng Cui
ZnO nanomaterials with the stereochemical structure were becoming a research focus in the scope of photocatalytic materials, but the ZnO was sensitive to UV light rather than the solar light source, which considerably prohibited its extended application. ZnO nanomaterials coupled with other nanomaterials could generate the alternative composite heterojunction nanomaterials to promote the photocatalytic activity. Herein, we reported two facile and feasible synthesis methods to fabricate TiO 2 /ZnO cube nanocomposites and Ag/ZnO hollow spheres by hydrothermal reaction and chemical deposition, respectively. In this regard, these composited nanomaterials have been successfully fabricated with high purities, good morphology, and crystal structure. Noticeably, in contrast with TiO 2 /ZnO and Ag/ZnO bulk nanocomposites, the Ag/ZnO hollow spheres could offer the higher activity for RhB degradation under the visible light. Moreover, the photocatalytic performance of Ag/ZnO for RhB degradation could be improved synergistically, and the effect of RhB degradation was highest when the Ag mass ratio was modulated at 10% in the sample. Furthermore, it remained a high photocatalytic efficiency even after four cycles. This protocol provided an approvable approach to fabricate efficient photocatalysts with persistent photostability in the wastewater treatment process.
Graphical abstract
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Wei He,Yucheng Liu,Zhi Huang,Wenwen Tu,Rui Liu,Mingyan Chen
A novel superhydrophilic and underwater superoleophobic material (MOF-5/PDA/SSM) with high flux, outstanding oil/water separation performance and durability was prepared. The stainless steel mesh (SSM) was modified by MOF-5 crystals and PDA. The introduction of MOF-5 can improve the hydrophilicity of SSM and achieve high water flux at the same time. PDA is a substance with strong adhesion which can be used as an effective bonding intermediate. The preparation strategy includes the self-polymerization of dopamine and the deposition of cubic clusters on SSM via hydrothermal reaction . The MOF-5 particles on the mesh are cubic hexahedral crystal with a uniform size diameter, which can trap water in the rough microstructure, forming a strong hydration barrier layer or composite water-solid interface on its surface, hindering the penetration of oil. The super-hydrophilicity and underwater superoleophobicity of the modified meshes were introduced by pre-wetting surface. The FTIR, XRD , XPS and SEM characterizations demonstrated that the successfully growth of MOF-5 and a rough structure was obtained on the mesh. The special wetting and the robustness of the fabricated mesh led to the outstanding separation efficiency (up to 99.5%), excellent recyclability (about 20 cycles) and high water flux (53.9 k L m −2 h −1 ). The mesh also showed remarked water flux and various oil/water mixtures separation performance. Particularly, the successfully prepared materials were found to be significant stable under various physical and chemical extremes environments, including maintain UWOCA>150 under acid/alkali media, marvelous performance after 120 min of continuous separation and high anti-oil intrusion pressure. The combination of metal organic framework and stainless steel mesh may provide a candidate application to effective oil-water separation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Chemical Science
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2025
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IF 7.4
Lei Xu,Qun Xu,Buxing Han
The advancement of nanotechnology has enabled magnetic nanomaterials to exhibit remarkable potential and application value in medicine, transportation, information storage, and spintronics owing to their unique physicochemical properties. In this study, supercritical carbon dioxide (SC CO2) was used to successfully induce room-temperature ferromagnetism in CaSnO3 without magnetic element doping, achieving a maximum saturation magnetization of 0.0727 emu g−1 at 16 MPa. The SC CO2 treatment introduced lattice-scale defects, releasing residual force within distorted SnO6 octahedra, which led to the suppression of structural distortion and drove a structural phase transition from orthorhombic to cubic. Additionally, the enhanced symmetry was accompanied by anisotropic lattice expansion and tensile strain, which thermodynamically lowered the oxygen vacancy formation energy, thereby kinetically driving the creation of more defects. This disrupted the intrinsic antiferromagnetic order and significantly enhanced ferromagnetism. This work elucidates a defect-strain synergy mechanism for tuning material magnetic order, distinguishing it from conventional stoichiometric doping strategies and highlighting the critical role of SC CO2 in material modification.
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DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2021
·Vol. 23
·期 1
·1-10
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IF 2.253
Liu Wenwen,Peng Renfu,Pan Jun
The severe recombination of photoinduced carriers is one of the major problems encountered in C 3 N 4 -based photocatalyst for hydrogen generation. Herein, PtPd/C 3 N 4 composites by in situ growth of cubic PtPd bimetallic co-catalyst on the surface of C 3 N 4 were constructed for photocatalytic hydrogen generation under visible light irradiation. The phase structure, microstructure, and optical property were characterized by X-ray diffraction, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. Photocatalytic hydrogen generation results showed that the growth of a moderate amount of cubic PtPd bimetallic co-catalyst on C 3 N 4 is excellent beneficial for enhancing hydrogen generation activity. By optimizing the loading content of cubic PtPd bimetallic co-catalyst, the PtPd/C 3 N 4 composite provided a maximum hydrogen generation rate of 54.31 μmol h −1 . The enhancement of the photocatalytic activity can be attributed to the efficient separation and transfer of photoinduced carriers. On one hand, PtPd bimetal can extract electrons from C 3 N 4 , which promotes the separation efficiency of the carriers. On the other hand, the face-to-face interface formed between PtPd cubes and C 3 N 4 nanosheets has a large contact area, resulting in lots of unique high-speed carrier transfer channels in PtPd/C 3 N 4 composite, which promotes the transfer efficiency of the carriers. The work highlights the construction of less expensive and suitable shape of co-catalyst for enhanced photocatalytic activity.
研究领域:
材料科学
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光催化
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Kunyan Nie,Jianbo Li,Heng Lu,RuiLin Zhang,Yu’an Chen,Fusheng Pan
Magnesium hydride (MgH 2 ) is a solid-state hydrogen storage material with promising applications. However, its slow hydrogen release rate at low temperatures (<573 K) and high hydrogen release energy barrier severely limit its practical applications. In this work, a bimetallic oxide (cubic NaNbO 3 ) with side length of 1–10 μm was derived from Nb 2 CT x MXene through a simple hydrothermal reaction, which has a high catalytic activity. The MgH 2 -5 wt% NaNbO 3 composite can rapidly release 6.18 wt% H 2 in 12 min at 260 °C and uptake 3.45 wt% H 2 in 90 min at 30 °C. The activation energy for dehydrogenation (E a ) of MgH 2 -5 wt% NaNbO 3 composite was calculated to be 84.72 kJ/mol, which is much lower than that of milled MgH 2 (150.98 kJ/mol). In addition, hydrogenation and dehydrogenation cycling test results indicated that the composite material presents excellent stable cycling durability, with a capacity retention rate of 99.7 % after 40 cycles, with almost no capacity degradation. The excellent hydrogenation and dehydrogenation ability is mainly contributed by the combined effect of NaMgH 3 , NaNbO 3 , Nb metal and NbH x . The results of this work are instructive for the design of high-properties catalysts to enhance the hydrogen storage capacity of Mg/MgH 2 system.
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Long Chen,Jiyou Zhong
Broadband near-infrared (NIR) phosphors are crucial components of NIR phosphor-converted light-emitting diode (pc-LED) sources for various smart spectroscopy applications. However, developing an efficient, tunable, and inexpensive broadband NIR phosphor with sufficient spectral coverage remains a great challenge. In this work, a cubic phosphate K2AlTi(PO4)3 with highly structural rigidity was chosen as host material for Cr3+ substitution to create an efficient NIR emission. Synthesizing this compound, the obtained material exhibits a broadband NIR emission covering 700–1200 nm with a peak wavelength ranging from 820 to 860 nm depending on the Cr3+ substituting concentration. The Cr3+ concentration optimized sample possesses a photoluminescence quantum yield (PLQY) of 76.4% with an emission peak centered at 857 nm and a full width at half-maximum (fwhm) of 184 nm under 464 nm exaction, demonstrating an efficient and relatively long-wavelength NIR emission with wide spectral coverage. This broadband NIR emission is mainly derived from a single kind of emission center deduced from spectral analysis, luminescence dynamics, and first-principle calculations. Using this material, the fabricated NIR pc-LED device presents an excellent NIR output power and NIR photoelectric conversion efficiency, making this material attractive in practical applications of night-vision and bioimaging. Therefore, this work not only provides a broadband NIR material with superiorities of low cost, high efficiency, wide-range tunability, wide spectral coverage, and relatively long-wavelength NIR emission for spectroscopy applications but also highlights some clues to discover this kind of materials.
研究领域:
材料科学
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光学材料
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固态照明
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光谱学
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光子学
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DOI
高影响因子
危险品化学品经营许可证（带存储）