CHEMOSPHERE
·
2018
·
IF 4.427
Wei Fang,Xianying Jiang,Hanjin Luo,Junjie Geng
A novel hybrid nanocomposite, polypyrrole nanoparticles (PPy) anchored on the graphene/silica nanosheets with the high specific surface area (polypyrrole-graphene/silica, GS-PPy), was synthesized by a facile in situ polymerization and shows great potential to remove hexavalent chromium [Cr(VI)] in aqueous solutions. Characterizations by XRD , TEM, SEM, BET, FT-IR and XPS, have confirmed that the PPy nanoparticles were well-distributed on the surface of GS nanosheets . The effects of pH, contact time, the concentration of Cr(VI), temperature, coexisting ions and the number of adsorption-desorption cycles were studied. The maximum adsorption capacity of the GS-PPy for Cr(VI) was 429.2 mg g −1 at 298 K at pH 2, which was much higher than PPy nanoparticles and other related materials. The adsorption data fitted to the pseudo-second-order model and Langmuir isotherm model. The removal mechanism involved in electrostatic attraction, ion exchange and reduction process that partial adsorbed Cr(VI) was reduced to Cr(III). And Cr(III) was still retained on the surface of GS-PPy. The GS-PPy nanocomposite will be a potential candidate for the removal of Cr(VI) from the industrial waste water.
研究领域:
环境科学
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材料科学
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纳米技术
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环境污染与控制
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物理化学
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DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jinxing Yu,Xiaoxiang Xu
Cr doped Ruddlesden-Popper compound Sr 2 TiO 4 has been successfully modified by fluorine to form a new compound Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 . Structure analysis suggests two types of fluorine in the structure of this new compound, i.e. intralayer and interlayer F, which induce strong built-in electric field within this layered compound. The electric field stems from uneven distribution of F atoms on the two sides of perovskite layers therefore leads to charge disproportionation . DFT calculations suggest that this unique structural feature is highly beneficial for charge dissociations as it breaks the coplanar settlement of conduction band minimum and valence band maximum whilst maintains the 2D charge transportation properties. This is clearly demonstrated by the superior photocatalytic activities of Sr 2 Ti 0.95 Cr 0.05 O 3 F 2 for hydrogen production from water. Apparent quantum efficiency (AQE) as high as 1.16% at 420 ± 20 nm has been achieved which stands as the highest AQE reported on Sr 2 TiO 4 to date. Photoelectrochemical (PEC) analysis confirms improved charge separation conditions and prolonged charge lifetime.
研究领域:
材料化学
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光催化
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能源化学
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物理化学
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无机功能材料
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太阳能转化
·
环境科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaozhong Zhou,Zhaoyi Qi,Yuyuan Jiang,Pengfei Yan,Juanxia Ding,Haiyan Wang,Hongkai Lu,Dongxu Liu,Kaifa Dong,Yougen Tang,Dongfei Sun,Ziqiang Lei
SiO x is regarded as a promising anode material for the next-generation lithium-ion batteries with high energy density. However, the reduplicative volume changes during cycling cause the pulverizations of Si, leading to decreased utilization of active Si component and poor cycling performance. Herein, a facile and scalable Fe-Cr decorating strategy is reported to boost the lithium storage of SiO x anode. Our comprehensive characterizations indicate that there are strong interactions between Fe-Cr and SiO x during a facile ball milling process. After cycling, Fe-Cr nanoparticles are dispersed in the in-situ formed lithium silicates and Li 2 O matrix, which can maintain superior conductivity of lithium ion and electron for the active components through point-to-point connections. This unique structure boosts the electrochemical de-alloying process of the low-valent Li x Si (0 ≤ x ≤ 2), and increases effective utilization of the active Si component during cycling, resulting in improvement of reversible capacity and cycling stability. This bm SiO x -FeCr electrode can deliver high reversible specific capacity (1370 m Ah g −1 at 200 mA g −1 ), good rate capability (653.8 m Ah g −1 at 2000 mA g −1 ), and superior cycling stability. This work provides a promising route for improving the utilization of active Si component and the structural stability of SiO x -based anodes.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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电池技术
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固态物理
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DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2013
·Vol. 210
·期 6
·1098-1102
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IF 1.469
Ping Chen,Mingsheng Qin,Haijie Chen,Chongying Yang,Yaoming Wang,Fuqiang Huang
An intermediate-band (IB) semiconductor CuGa 1− x Cr x S 2 was investigated by the self-consistent many-body GW approach (sc GW ) and further confirmed by the experimental results. The Cr dopant introduced a partially occupied IB, and the density-of-states analysis indicates the electron transfer between the impurities and host lattice would suppress the non-radiative recombination. The CuGa 1− x Cr x S 2 was synthesized by a high-temperature solid-state reaction and the X-ray photoelectron spectroscopy (XPS) indicated the presence of Cr 3+ . Due to the Cr dopant, two additional absorption responses were directly observed in the UV–Vis–NIR absorption spectrum. The further photocatalytic investigations verified the IB absorptions could produce highly mobile electrons and holes to degrade dyes. This material leads to lower-energy photon absorption, which could be a promising candidate for the high-efficiency solar cells.
研究领域:
材料科学
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光伏技术
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半导体物理
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计算材料学
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能源材料
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DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jun Luo,Ao Wang,Lichao Jia,Dong Yan,Mei Hu,Jian Li
For the improvement of commercial catalyst 13 wt % Cr-γ-Al2O3 for the dehydrogenation of light alkanes to olefins, 13 wt % Cr-x wt % Ce-γ-Al2O3 catalysts with x equaling 0, 2.5, 5, 7.5, and 10, named as 0Ce, 2.5Ce, 5Ce, 7.5Ce, and 10Ce, are prepared by the incipient wetness impregnation method, characterized by X-ray diffraction, transmission electron microscopy, Raman, UV–vis, X-ray photoelectron spectroscopies, and temperature-programmed reduction and evaluated for ethane dehydrogenation to ethylene. Their performance increases with Ce addition to 5 wt % and then decreases and attenuates with time. 5Ce demonstrates the highest dehydrogenation activity and better regeneration ability than 0Ce. It is found that the as-prepared 5Ce contains more active amorphous Cr6+ species and less crystalline Cr3+ species (α-Cr2O3) than 0Ce, other than the Ce species of CeO2. The reasons for the better dehydrogenation and regeneration performance of 5Ce are that the CeO2 particles in 5Ce physically separate the Cr species, promoting the formation of Cr6+ species, preventing their aggregation and migration to form less active α-Cr2O3 and inactive α-(Cr, Al)2O3, and preserving more active Cr6+ species in the as-prepared and regenerated catalysts.
研究领域:
催化化学
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化学工程
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材料科学
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石油化工
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DOI
高影响因子
CRYSTENGCOMM
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2022
·Vol. 24
·期 32
·5724-5732
·
IF 3.756
Boyuan Di,Pengzhen Zhang,Hongfei Yin,Peng Han,Hao Wu,Gaojie Zhang,Wen Jin,Xiaokun Wen,Wenfeng Zhang,Haixin Chang
The discovery of two-dimensional (2D) van der Waals (vdW) ferromagnets has provided a broad platform for the study of spintronics and many novel physical phenomena. However, vdW ferromagnetic crystals generally have a low Curie temperature and poor air stability and their magnetic properties are difficult to modulate. As a layered Dirac semimetal, NiTe2 has excellent properties such as high electrical conductivity and high air stability. In this work, we report for the first time the introduction of ferromagnetism into NiTe2 single crystals by doping Cr atoms with the Te-flux method. By controlling the Cr content, the Curie temperature can be tuned from 210 K to 248 K and the saturation magnetic moment from 1.54 emu g−1 to 2.27 emu g−1 which is much higher than the defective magnetism caused by doping. The doped nanosheets still have extremely high air stability, in contrast with most vdW 2D ferromagnet crystals. The results provide opportunities for the study of new highly-tunable, air-stable vdW ferromagnets and their potential applications.
研究领域:
凝聚态物理
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材料科学
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自旋电子学
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二维材料
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磁性材料
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 5.2
Abdelazeem S. Eltaweil,Nouf Al Harby,Mervette El Batouti,GopiKrishna Pasam,Mazin Al Kitani,Eman M. Abd El-Monaem
In this study, the adsorption capability of green algae-derived biochar was enhanced by integrating with iron sulfide, creating the FeS 0.66 @GA-BC 0.33 composite. The magnetic FeS 0.66 @GA-BC 0.33 composite exhibited excellent adsorption performance toward Cr(VI) with a maximal adsorption capacity of 423.73 mg/g. Surprisingly, the FeS 0.66 @GA-BC 0.33 composite showed fast adsorption, with an equilibrium time of 60 minutes. Furthermore, batch experiments showed that the maximum removal efficiency of Cr(VI) by FeS 0.66 @GA-BC 0.33 was 92.39% at pH 3, 20 °C, and an adsorbent dose of 0.01 g. The kinetic analysis indicated that the pseudo-second-order model best described the adsorption process, while the isotherm results showed good agreement with both the Langmuir and Freundlich models. A combination of response surface methodology (RSM) and Box–Behnken design (BBD) was used to optimize the adsorption of Cr(VI) onto FeS 0.66 @GA-BC 0.33 . The independent variables were adsorbent dose (5–30 mg), initial Cr(VI) concentration (50–300 mg/L), and contact time (1–120 min). Analysis of variance (ANOVA) showed that the maximum removal efficiency reached 99.09% at an adsorbent dose of 17.5 mg, an initial Cr(VI) concentration of 50 mg/L, and a contact time of 120 min. The Cr(VI) adsorption mechanism was proposed based on the X-ray photoelectron spectroscopy spectra of fresh and used FeS 0.66 @GA-BC 0.33 composites, suggesting the governing reduction reaction, electrostatic interaction, and coordination bond pathways on the adsorption of Cr(VI).
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DOI
高影响因子
ChemCatChem
·
2026
·Vol. 18
·期 9
·e70761
·
IF 4.1
Mengdie Cai,Yulu Xu,Yao Lu,Qi Jin,Yongshuai Chen,Jia-qi Bai,Fang Chen,Zhimin Song,Song Sun
Developing efficient visible-light-driven photocatalysts for overall water splitting remains a significant challenge. Herein, Sn/Cr co-doped SrTiO 3 (SCSTO) was synthesized via a flux-assisted solid-state reaction, with Sn substituting Sr sites and Cr replacing Ti sites in the perovskite lattice. Sn/Cr synergistic co-doping extends optical absorption into the visible region, narrows the bandgap to 3.04 eV, suppresses Ti3+ defects and oxygen vacancies, and promotes charge separation and migration. Benefiting from the rational band structure and defect engineering, under visible-light irradiation (λ > 380 nm), the optimal SCSTO exhibits a hydrogen evolution rate of 15.4 µmol·h − 1 and oxygen evolution rate of 7.34 µmol·h −1 , with outstanding cycling stability. DFT calculations confirm that Cr 3d mid-gap states below the Ti 3d conduction band enhance visible-light response and charge transfer. This work provides a universal and feasible co-doping strategy for designing high-performance perovskite oxide photocatalysts toward efficient solar fuel production, which is instructive for the development of advanced visible-light-driven photocatalytic systems. Graphical A synergistic Sn/Cr dual-site co-doping strategy was developed for SrTiO 3 to enable efficient visible-light-driven overall water splitting.
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
·
IF 3.9
Zequn Li,Luogang Wu,Guangcan Huang,Xuetong Cui,Zilong Chen,Qiang Chen,Jian-Rong Li
Mixed matrix membranes (MMMs) incorporating metal–organic frameworks (MOFs) are attractive for molecular recognition and separations, but precisely engineering the MOF filler structure toward maximizing its inherent nanopore separation capability remains challenging. Here, we report a fluorination strategy to functionalize MIL-101 that synergistically optimizes its pore chemical environment and interfacial compatibility with the polymer matrix. Compared with the MIL-101/6FDA-DAM membrane, the incorporation of strong electron-withdrawing fluorinated ligands enhances both the CO2 adsorption affinity of MIL-101 and its hydrogen-bonding interaction with the 6FDA-DAM matrix. The optimized MIL-101-F/6FDA-DAM (10 wt %) membrane achieves a CO2 permeability of 2200 Barrer, a 150% enhancement over the pure 6FDA-DAM membrane, while maintaining a comparable CO2/CH4 selectivity of 21. The excellent separation performance surpasses the 2008 Robeson upper bound. This work provides a simple and effective approach to advancing the gas separation performance of MMMs.
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DOI
高影响因子
HYDROMETALLURGY
·
2026
·
IF 6.3
Ronghao Liu,Yongqi Yang,Fan Wang,Yingrui Zhuang,Yangyang Wang,Yanzhao Yang
The hydrogen bond interactions between TOPO and different HBDs were studied. • The maximum extraction capacity of HDES based on TOPO to Cr(VI) reached 187 mg/g. • The extraction mechanism of Cr(VI) can be inferred as ion association mechanism. • The mass transfer rate of extraction is controlled by the diffusion action. • Chromium(VI) loaded DES phase can be separated by using 0.12 mol/L Na 2 SO 3 . Efficient and environmentally friendly treatment of Cr(VI) in water is essential for enhancing aquatic ecosystems. In this work, hydrophobic deep eutectic solvents based on trioctylphosphorus oxide were used for efficient extraction and recovery of Cr(VI) from the acidic aqueous phase. By using binary phase diagram analysis and molecular dynamics simulation, the hydrogen bond interactions between hydrogen bond donors (decanoic acid, decanol and thymol) and TOPO were studied. The experimental results demonstrated that 0.1 g HDES achieved over 95% extraction efficiency from a 3.0 mL 500 mg/L Cr(VI) solution at pH = 0.5. And the maximum extraction capacity reached 187 mg/g. Furthermore, the extraction process was largely unaffected by variations in anions. Combined with the characterization of FT-IR and UV–vis, the extraction mechanism of Cr(VI) by HDES can be inferred as the ion association mechanism. Thermodynamic revealed that the extraction process is spontaneous and characterized by a decrease in endothermic entropy. Mass transfer at the interface appears to control the diffusion rate. Notably, when 0.12 mol/L Na 2 SO 3 was used as the stripping agent, the HDES maintained stable extraction performance over eight extraction-regeneration cycles. This study offers a promising strategy for the efficient, sustainable extraction of Cr(VI) using a novel green solvent. Download: Download high-res image (177KB) Download: Download full-size image
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DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Yupeng Lu,Jiaqian Sun,Lu Wang,Jinping Wang,Rui Yang,Chunling Zuo,Xiaoshuang Chen
For the goal of mitigating energy scarcity via hydrogen production from water electrolysis, the high performance, low cost transition-metal-based catalysts are essential to be designed and manufactured. In this study, we prepare chromium-doped nickel cobalt phosphide/nickel sulfide (Cr-NiCoP/Ni3S2) heterostructured hollow nanowires on conductive nickel foam through a two-step hydrothermal method coupled with low temperature phosphorization procedure. Benefiting from the remarkable electron transport capability inherent in transition metal compounds, the large specific surface area afforded by distinctive hollow nanowire architecture, and the interfacial synergistic effect of heterostructure, the as-obtained catalyst delivers low overpotentials of 67 mV for HER and 243 mV for OER at a current density of 10 mA cm–2 in alkaline electrolyte. Additionally, in an electrolytic system where the Cr-NiCoP/Ni3S2 acts as bifunctional anode and cathode materials, the 10 mA cm–2 current density can be achieved at a cell voltage of 1.47 V with good stability. This catalyst demonstrates better performance than the majority of reported transition metal based bifunction substances. The work described in this paper not only develops a new class of catalytic materials integrating application potential and expense advantage but also provides important strategic support for the fabrication and optimization of nonprecious metal electrocatalysts.
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DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2026
·
IF 6.9
Sitian Zhu,Zhigang Xu,Qiang Shen,Chuanbin Wang,Lianmeng Zhang
Trivalent chromium (Cr(III)) electrodeposition is regarded as an environmentally benign alternative to hexavalent chromium plating, but the protective performance of Cr(III)-ZrC composite coatings can be limited by ZrC nanoparticle agglomeration and non-uniform incorporation. In this work, the nonionic surfactant Synperonic F108 (SF) was introduced for the first time into a Cr(III)-ZrC composite electrodeposition system to regulate ZrC dispersion and improve coating uniformity and corrosion resistance. SF was proposed to form a steric stabilization layer on ZrC nanoparticles, and the dispersion results were consistent with reduced agglomeration and more homogeneous incorporation into the Cr(III) matrix. At an optimal SF concentration of 0.5 g/L, the dynamic light scattering (DLS)-measured median agglomerate size of ZrC decreased from 268 to 139 nm, and scanning Kelvin probe force microscopy (SKPFM) revealed the lowest surface-potential standard deviation of 9.04 mV, indicating improved dispersion and reduced local electrochemical heterogeneity. Consequently, compared with the SF-free coating, the corrosion current density of the 0.5 g/L SF coating decreased by 90.5%, from 5.39 to 0.51 μA·cm −2 , while its charge-transfer resistance increased to 69.7 × 10 4 Ω·cm 2 . Time-dependent electrochemical impedance spectroscopy and an 80-day scratched immersion test in 3.5 wt% NaCl solution further confirmed the superior long-term protective performance of the optimized coating. The enhanced performance is consistent with reduced agglomeration-induced defects, improved microstructural uniformity, and reduced local electrochemical heterogeneity, which may contribute to limiting preferential electrolyte ingress during long-term exposure. These findings demonstrate that surfactant-mediated dispersion regulation is an effective strategy for improving Cr(III)-based composite coatings.
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