Small
·
2024
·Vol. 20
·期 24
·2308304
·
IF 13
Weiqun Li,Chucheng Luo,Jimin Fu,Juan Yang,Xiangyang Zhou,Jingjing Tang,B. Layla Mehdi
Lithium–ion batteries (LIBs) has been developed over the last three decades. Increased amount of silicon (Si) is added into graphite anode to increase the energy density of LIBs. However, the amount of Si is limited, due to its structural instability and poor electronic conductivity so a novel approach is needed to overcome these issues. In this work, the synthesized chromium silicide (CrSi 2 ) doped Si nanoparticle anode material achieves an initial capacity of 1729.3 mAh g −1 at 0.2C and retains 1085 mAh g −1 after 500 cycles. The new anode also shows fast charge capability due to the enhanced electronic conductivity provided by CrSi 2 dopant, delivering a capacity of 815.9 mAh g −1 at 1C after 1000 cycles with a capacity degradation rate of <0.05% per cycle. An in situ transmission electron microscopy is used to study the structural stability of the CrSi 2 -doped Si, indicating that the high control of CrSi 2 dopant prevents the fracture of Si during lithiation and results in long cycle life. Molecular dynamics simulation shows that CrSi 2 doping optimizes the crack propagation path and dissipates the fracture energy. In this work a comprehensive information is provided to study the function of metal ion doping in electrode materials.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固体物理
·
计算材料学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Bingkai Gao,Lei Zhang,Runqiu Peng,Panlai Li,Qian Wu,Zhijun Wang
The exploration of performance luminescence near-infrared (NIR) material is crucial for rapidly developing NIR spectroscopic techniques. Herein, the NIR LaMg 0.5 Sn 0.5 O 3 :Cr 3+ phosphor was synthesized by a high temperature solid-state method. And its luminescence performance were improved by [In 3+ -Sc 3+ ] substituting for [Mg 2+ -Sn 4+ ]. The half-peak width can be expanded to 211 nm, the emission intensity can reach the seven times of that un-substitution, and the emission intensity at 423 K was maintained at 60 % of that at room temperature , moreover, the internal quantum efficiency can reach 54.2 %. On this basis, the phosphor converted light emitting diodes ( pc -LEDs) were achieved by combining La(Mg 1-x Sn 1-x In x Sc x ) 0.5 O 3 :Cr 3+ with blue LED, importantly, it can be applied to the biodetection and night vision lighting, which indicate its application value.
研究领域:
材料科学
·
生物医学工程
·
光学材料
·
分子影像
·
转化医学
·
光电子学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaofeng Zhang,Maduru Suneetha,Muhammad Usman,Tauqeer Ahmad,Salamat Ali,Muhammad Sufyan Javed,Shaukat Khan,Ahmed M Hassan,Samah E. Elkhatib,Mohamed Ouladsmane,Sung Soo Han,Weihua Han
Aqueous hybrid supercapacitors (AHSCs) have great potential in portable devices and other modern electronic products due to their high-power density, long life span, and environmentally friendly. However, compared with traditional Li-ion batteries, they are still not mature enough to meet market requirements due to their low energy density . In this study, we proposed to use nanostructured bi-metallic nickel-chromium oxide as an AHSC cathode. By using the synergetic effect arising from the two metal cations , Ni and Cr-ions, the energy storage performance of AHSCs was expected to be significantly improved. We synthesized the nanostructured bi-metallic nickel-chromium oxide (NiCrO 3 ) with a facile hydrothermal method . The achieved NiCrO 3 (NCO) has a sheet-like structure and a hexagonal shape in the nanoscale . The results show that NCO loading on carbon cloth (CC) as the working electrode (NCO@CC) has a high specific capacitance of 2,862 F/g at 1 A/g (corresponding capacity of 1,431 C/g) and a favorable cycling stability of 98.3% after 10,000 cycles at 10 A/g. The specific capacitance is about 2.3 and 5.9 times of pristine Cr 2 O 3 and NiO in the same situation. The storage mechanism of charge was investigated by ex -situ XRD , XPS , and Raman spectroscopy , which reveals that the total stored charge is based on the combination of faradic and pseudocapacitive effects. Furthermore, AHSC was fabricated using the NCO@CC as cathode, activated carbon as anode, which showed promising performance (102.7 F/g at 2 A/g) with excellent rate-capability (58.5% at 20 A/g), long life span (48% after 50,000 cycles). Density function theory calculation reveals that NCO possesses higher conductivity than NiO and Cr 2 O 3 , and decreases the electron transport energy, which contributes to the improves the reactions kinetics.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
物理化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12892-12898
·
IF 4
Chaojie Li,Małgorzata Sójka,Jiyou Zhong,Jakoah Brgoch
Rapid, non-destructive food-quality analysis using near-infrared (NIR) photoluminescence spectroscopy produced by phosphor-converted light-emitting diodes (pc-LEDs) has fascinating prospects for future food-safety monitoring. However, covering the energy window for organic molecular vibrations of interest in these applications requires NIR-emitting phosphors that are highly energy-efficient with ultra-broadband photoluminescence. This remains a materials design challenge. Here, a Cr3+-substituted garnet phosphor, Mg3Gd2Ge3O12, is found to possess a desired broadband NIR emission (λem = 815 nm, fwhm = 172 nm; 2513 cm−1) covering from 700 nm to 1200 nm with a photoluminescence quantum yield of 60.8% and absorption efficiency of 44.1% (λex = 450 nm). Fabricating a prototype NIR pc-LED device using the title material combined with a 455 nm emitting InGaN LED chip produces a NIR output power of 23.2 mW with photoelectric efficiency of 8.45% under a 100 mA driving current. This NIR light source is then used to demonstrate the quantitative detection of ethanol in solution. These results highlight the feasibility of this material for NIR spectroscopy and validate the prospects of using NIR pc-LEDs in food-quality analysis.
研究领域:
分析化学
·
食品科学
·
光电子材料
·
分子光谱学
·
食品安全
·
材料科学
·
光学传感
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Meimei Zhou,Wei Zou,Xuemei Zhu,Huachen Ma,Pengbo Wang,Jiaxin Shang,Pingping Luo
UIO-66-NH 2 was successfully deposited on electrospun polyacrylonitrile (PAN) nanofibers treated by thermal oxidative stabilization (TOS) via a simple and effective in situ growth method. Owing to the formation of acridone rings, naphthyridinering rings and hydronaphthyridine rings during the TOS process, the thermally stabilized electrospun PAN (TSPAN) nanofibers were greatly improved in stability and heat resistance and could provide adequate nucleation points for MOFs growth, indicating an ideal MOFs deposition support without additional surface modifications. The results demonstrated that UIO-66-NH 2 crystals distributed relatively uniform and dense on the TSPAN nanofibers with mass loading up to 28.1 wt%. Compared with powdered UIO-66-NH 2 , the formed UIO-66-NH 2 @TSPAN nanofibers showed enhanced visible light driven photocatalytic activity towards reduction of Cr(VI) due to the improvement of visible light response, more excellent photothermal conversion ability and the increase of exposed active sites. The photocatalytic reduction rate of Cr(VI) over UIO-66-NH 2 @TSPAN was up to 93% within 180 min and the rate constant (k = 0.1362) was 2.3 times that of powdered UIO-66-NH 2 (k = 0.00576). Significantly, the mechanical flexibility and structural stability endowed the nanofibrous photocatalyst easy operation and outstanding reusable capability. The photocatalytic activity for Cr(VI) reduction still preserved 90% after five cycles. This work proposes a facile strategy for preparation of free-standing MOFs nanofibers and provides MOFs-based photocatalysts a new opportunitie for broad applications in water treatment.
研究领域:
材料科学
·
环境催化
·
纳米材料
·
光化学
·
水处理技术
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2021
·
IF 0
Yuhao Xiong,Linjing Su,Fanggui Ye,Shulin Zhao
The dephosphorylation that involves the removal of a phosphate group from a substrate molecule plays a significant role in living organisms. An enzyme mimic (nanozyme) with phosphatase-like catalytic activity has recently received attention in terms of its capacity for dephosphorylation. In this study, three types of highly porous oxyhydroxide with remarkable triphosphatase-like catalytic activities, ZrOOH, GdOOH, and HfOOH, have been prepared through the transformation of metal–organic frameworks (MOFs) using a simple alkaline hydrolysis method. The triphosphatase mimetic activities of ZrOOH, GdOOH, and HfOOH were then thoroughly investigated and verified. In particular, an isotopic tracing experiment revealed that abundant surface hydroxyls could serve as nucleophilic agents to directly attack the electropositive phosphorus atom, causing the cleavage of the terminal phosphoester bonds of phosphoester substrate molecules. The kinetic analysis provided calculated values of Km of 105.7, 90.5, and 46.1 μM, while the Vmax values were 3.57, 4.76, and 2.74 × 10–8 M s–1 and Ea values were estimated to be 47.52, 41.15, and 52.79 kJ/mol for ZrOOH, GdOOH, and HfOOH, respectively. The chromium(III) ions acting as “poisoning” inhibitors efficiently downregulated the triphosphatase mimetic activity of GdOOH. On the basis of this effect, a colorimetric chromium(III) ion-sensing system was explored, which provided a relevant linear response range for the detection of chromium(III) ions of 5.0–200 μM and a low detection limit of 0.84 μM. This work not only shows the great potential of ZrOOH, GdOOH, and HfOOH as triphosphatase nanozymes but also deepens our understanding of the role of surface hydroxyls on phosphatase-mimicking nanozyme catalytic dephosphorization, which could be used in the rational design of phosphatase-mimicking nanozymes. Furthermore, the developed colorimetric sensing system could be applied to chromium(III) ion detection in biological systems.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
环境科学
✓ 已验证
DOI
PubMed
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xueyan Li,Suya Li,Chong Peng,Yuanfei Wang,Yun Li,Shuyi Yang,E. Tao
To avoid the environmental detriment caused by Cr(VI) waste, this study constructs a dual cross-linking network structure using sodium alginate (SA) and polyvinyl alcohol (PVA). Chitosan (CS) is further introduced through electrostatic attraction and hydrogen bonding and SA/PVA/CS (SPC) composite with porous structure is successfully prepared for the removal of Cr(VI) from wastewater. Batch adsorption experiments show that SPC has excellent adsorption capacity and practical usability with a broad pH applicability range. Under optimal adsorption conditions (pH = 2, t = 150 min, T = 35 °C, m/ V = 2 g/L, C 0 = 10 mg/L), the Cr(VI) removal rate of SPC achieves 89.2 %. Adsorption kinetics and isotherm models indicate that the adsorption process is primarily multi-layer and chemical adsorption. Additionally, FT-IR and XPS reveal that the adsorption mechanism of SPC for Cr(VI) involves a synergy of electrostatic attraction, reduction, ion exchange and complexation. Density functional theory (DFT) simulations also confirm the dominant role of CS in the Cr(VI) adsorption. In summary, SPC shows great potential for Cr(VI) wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chaofan Zhang,Qiu Zhuang,Hao Wang,Xintong Ying,Ruoyang Ji,Daohu Sheng,Wei Dong,Aming Xie
Hexavalent chromium (VI) heavy metal contamination is considered a serious threat to human health and the environment. The photocatalytic reduction of Cr(VI) basically occurs in the acidic environment, severely limiting the application of photocatalysts for the reduction of Cr(VI). Therefore, we designed a microenvironment strategy to achieve efficient reduction of Cr (VI) under neutral conditions by introducing sulfonic acid onto the aromatic conjugated skeleton. A series of characterizations and experiments have shown that the sulfonated aromatic ring conjugated polymer (Arcp-SO 3 H) can efficiently remove Cr(VI) under neutral or even alkaline conditions. In neutral solutions, Arcp-SO 3 H has a rate constant of 0.054 min −1 within 90 min and has an efficiency of nearly 100 %, which is 16 times faster than before sulfonation (k = 0.0316 min −1 ). the Arcp-SO 3 H surpasses all organic polymers and most metal-based photocatalysts in the related field. The capture experiments have proved that •O 2 – is the main role of reducing Cr(VI), and e - is secondary, which is quite different from the mechanism reported in the previous literature. The efficiency of reducing Cr (VI) in the four-cycle experiment is still 96 %, which also proves that Arcp-SO 3 H has strong stability and reproducibility. Thus, Arcp-SO 3 H has great practical application potential in the treatment of wastewater, and microenvironmental strategies also offer new possibilities in the field of environmental remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lingli Zhu,Dekui Shen,Kai Hong Luo
Considering that hexavalent chromium ions (Cr 6+ ) with high toxicity poses a huge threat to human health and the ecological environment, constructing a rapid and accurate sensing platform is of great significance in detecting the toxic substance. The novel nitrogen and boron co-doped carbon quantum dots (N, B-CQDs) from lignin are synthesized as fluorescent sensors for the detection of Cr 6+ . The synthetic processes involve the acid hydrolysis step followed by the hydrothermal treatment step. Lignin is firstly depolymerized by cleaving ether bonds in the acidolysis , and N, B-CQDs are consequently formed by the aromatic re-fusion of lignin nanoparticles in the hydrothermal process. The lignin-derived N, B-CQDs show triple emission of purple, blue and green fluorescence under the excitation of 300, 330, and 490 nm, respectively. The triple-emission N, B-CQDs are applied for the triple-channel detection of Cr 6+ , which exhibit highly sensitive and selective fluorescence quenching for Cr 6+ with good linearity (R 2 ≤ 0.996) and very low limit of detection as 0.054, 0.049, and 0.077 μM under the excitation of 300, 330 and 490 nm, respectively. The utilization of renewable lignin as CQDs-based fluorescent sensors opens a new avenue for the rapid and accurate detection of Cr 6+ through a multichannel sensing platform.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 2
·361
·
IF 3.06
Haili Wang,Wenfeng Han,Xiliang Li,Bing Liu,Haodong Tang,Ying Li
Cr2O3nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3and Cr2O3prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3prepared by SCS after reaction was not detected, indicating high resistance to sintering.
研究领域:
材料化学
·
催化化学
·
纳米材料科学
·
环境友好化工
·
氟化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Ruidong Liu,Zhizhou Yang,Shiwei Chen,Jinshui Yao,Qiuhong Mu,Dan Peng,Hui Zhao
A novel hyper-cross-linked porous polymer based on hexaphenyldisiloxane (HCP-DH) is synthesized through Friedel−Crafts reaction. The surface area of HCP-DH is up to 1084 m 2 g −1 , and it exhibits excellent adsorption capacities and reusability in organic dyes removal from water. Additionally, the structure of the synthesized polymer can be adjusted by alkali treatment, forming Si OH groups in the pore structures. The porous polymer can be modified by the reaction of Si OH groups and (3-aminopropyl)methyldiethoxysilane easily, and the amino functionalized porous polymer displays a good property in the field of chromium ion adsorption with an adsorption amount of 44.5 mg g −1 under neutral condition. This method provides a new strategy for the synthesis and functionalization of porous polymers.
研究领域:
材料科学
·
环境工程
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 4
·1-9
·
IF 2.5
Qian Di,Jin Yahong,Li Yanmei,Wu Haoyi,Hu Yihua
Phosphor-converted light-emitting diodes (pc-LEDs) with broadband near-infrared (NIR) emissions have garnered significant research interest. Their performance is primarily determined by the type of NIR phosphor used. Herein, a broadband NIR-emitting phosphor, Y 3 Sc 2 Al 3 O 12 :Cr 3+ , is synthesized. The blue-light excitation of the Y 3 Sc 2 Al 3 O 12 :Cr 3+ phosphor produces a broadband emission spectrum ranging from 640 to 1000 nm with a full width at half maximum (FWHM) of 113 nm. The NIR emission intensity maintains approximately 50% of the initial room-temperature intensity at 423 K. The structure–property relationship is also comprehensively studied. Encapsulating the as-obtained NIR phosphor into prototype pc-LEDs produces an NIR output power of 58.1 mW at a 1230 mA driving current and a photoelectric conversion efficiency of 3.5% at 30 mA. Finally, night-vision applications are implemented using the as-fabricated pc-NIR-LEDs device.
研究领域:
材料科学
·
光电子学
·
固态照明
·
红外技术
·
荧光粉化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）