CHEMICAL ENGINEERING JOURNAL
·
2015
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IF 4.321
Ting Song,Jingpei Huo,Tian Liao,Jian Zeng,Jiayi Qin,Heping Zeng
C 60 modified Cr 2− x Fe x O 3 nanostructure photocatalysts were successfully synthesized by a simple absorbing process and employed in the photocatalytic H 2 evolution. The as-prepared C 60 –Cr 2− x Fe x O 3 nanocomposites exhibits significantly enhanced photocatalytic activity for photocatalytic H 2 evolution without any noble metal. It is shown that the photoinduced electrons achieve high migration efficiency on the interface C 60 and Cr 2− x Fe x O 3 , which is generated by the intense interaction of C 60 and Cr 2− x Fe x O 3 with conjugative three-dimensional π-system. A possible mechanism was proposed and supported by the PL emission spectrum technique and transient photocurrent responses.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 9
·092505
·
IF 3.3
Chuntao Ge,Qian Kou,Rong Li,Wenjuan Qi,Junjie Xu,Jun Zhang,Saijun Xiao
The NaCl-CaCl2 molten salt system presents a cost-effective and stable medium for the electrodeposition of metallic chromium. However, the electrochemical behavior of Cr2+ and the deposition process for dense chromium coatings within this system remain unexplored. Using CrCl2 as a precursor, this study investigated the electrochemical behavior of Cr2+ in NaCl-CaCl2 molten salt at 620 °C through cyclic voltammetry and square wave voltammetry. The results revealed that the reduction of Cr2+ involved a one-step, two-electron exchanged reaction (Cr2++ 2e−→Cr), exhibiting quasi-reversible behavior controlled by diffusion, with a diffusion coefficient of 0.5 × 10–5 cm2s−1. Electrodeposition on a molybdenum substrate demonstrated that current density significantly influenced coating morphology. An optimal condition of 30 mA cm−2 yielded a dense and uniform chromium coating, whereas current densities of 50–70 mA cm−2 resulted in significant degradation in coating planarity due to concentration polarization. Deposition time exhibited a linear positive correlation with coating thickness. Extending deposition time eliminated initial island growth and enhanced coating continuity. X-ray diffraction confirmed the coating consisted of pure chromium phase with a strong (200) preferred orientation. This research provided a theoretical and experimental foundation for electrodepositing chromium metal coatings in the NaCl-CaCl2 molten salt system.
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Chenye Xie,Hui Yan,Yuanfang Song,Yuxi Song,Chuanwei Yan,Ao Tang
Renewable energy integration requires a safe and efficient solution to effectively store and release electrical energy in a vast scale. Cost-effective iron-chromium redox flow battery is a reviving alternative for long-duration grid-scale energy storage applications . However, sluggish kinetics of Cr 2+ /Cr 3+ redox reaction along with parasitic hydrogen evolution at anode still significantly limits high-performance operation of iron-chromium flow batteries . Herein, a bimetallic Pb/Bi electrocatalyst is delicately designed and fabricated on carbon felt electrode, which synergistically boosts Cr 2+ /Cr 3+ kinetics and alleviates hydrogen evolution. Combined experimental characterization and theoretical calculation prove that metallic Bi substantially enhances Cr 2+ /Cr 3+ reversibility owing to strong adsorption and intensified Cr-3d and Bi-6p orbitals hybridization, while Pb endowed with a high activation energy barrier effectively alleviates hydrogen evolution. Benefitting from the bimetallic Pb/Bi electrocatalyst with optimized Pb/Bi ratio, the iron-chromium flow battery demonstrates low polarizations and substantially enhanced rate performance as compared to the flow cell using pristine carbon felt, with an energy efficiency of 77% readily achieved at 125 mA cm −2 , which offers a deep insight into development of high-efficiency electrocatalyst for high-performance operation of iron-chromium flow batteries .
研究领域:
能源存储
·
电化学催化
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2020
·Vol. 35
·期 2
·363-367
·
IF 0.64
Yan Ming,Li Chao,Zou Yunqi,Yang Mengliu
The solid solution of (Cr 2− x Mn x )GaC with magnetic properties was synthesized by pressureless sintering. The composition, morphology, and magnetic properties of products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The experimental results indicate that the solid solubility of Mn is related to the value of x , which reaches the maximum at x =0.4 and the characteristic peaks shift effect is most obvious. After the solution treatments, the samples of (Cr 2− x Mn x )GaC still presents the layered structure of MAX phase, and the lattice parameter has decreased slightly. By characterizing the magnetic properties of (Cr 2− x Mn x )GaC, the successful doping of Mn atoms was confirmed, and the intensity of magnetism was positively correlated with the doping amounts of Mn.
研究领域:
材料科学
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固体化学
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磁性材料
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陶瓷材料
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纳米材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Litao Lin,Tengchao Guo,Yu Chen,Xiaochi Lu,Bin Quan,Xiaogu Huang
The advancement of hyperspectral detection technology has challenged the development of hyperspectral camouflage materials. Despite the high spectral similarity of existing bio-inspired hyperspectral materials, their poor weather resistance limits their application in harsh environments. To address this, it is essential to enhance the weather resistance of hyperspectral materials while maintaining high spectral similarity. Therefore, inorganic hyperspectral materials are employed to improve durability. However, these inorganic materials generally exhibit lower spectral similarity and insufficient near-infrared reflectance, which restricts their ability to match the spectral characteristics of diverse plant backgrounds. To enhance spectral and color similarity with green plants, this study investigates Cr 2-x Ti x O 3 , which exhibits low visible reflectance and high near-infrared reflectance. The impact of annealing temperature on reflectance (400–1300 nm) was assessed using SEM, XRD, XPS, and UV–Vis–NIR spectroscopy. The influence of free carrier concentration and particle size on reflectance was analyzed. Hyperspectral coatings based on Cr 2-x Ti x O 3 were prepared, demonstrating tunable hyperspectral reflectance. Results indicate that Cr 2-x Ti x O 3 annealed at 1100 °C has the highest near-infrared reflectance, largest red-edge slope, and tunable range, with low visible reflectance. Ultimately, the optimized spectral similarity of these coatings can reach 97 %, coupled with superior environmental durability.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Li Runze,Guo Yang,Yuan Shiling,Liu Gang,Lin Meng
Iron-chromium flow battery is considered one of the preferred technologies for large-scale energy storage facilities due to its advantages of low pollutability, less cost and high safety. However, the poor reversibility of the Cr 3+ /Cr 2+ redox reaction at the anode of iron-chromium flow batteries, the low activity and the susceptibility to hydrogen evolution reaction are the primary problems that restrict the development and application of this battery. On the basis of graphite felt electrodes, we prepared bismuth-lead oxides co-modified graphite felt electrodes via acid etching and electrodeposition method to improve the electrochemical performance in the reaction kinetics. The structural and catalytic properties of the materials were characterized and evaluated by scanning electron microscopy, X-ray photoelectron spectroscopy, X‐ray diffraction spectroscopy and electrochemical methods, respectively. The results show that with the help of the interaction between Bi and Pb elements, the successfully prepared modified electrode not only improves the reversibility and reaction rate of the electrochemical redox reaction of Cr 3+ /Cr 2+ but also effectively inhibits the occurrence of hydrogen evolution reaction.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Wu Min,Nan Mingjun,Liu Shumin,Zhong Caihe,Qiao Lin,Zhang Huamin,Ma Xiangkun
With the increasing demand for energy storage technology, iron-chromium flow batteries (ICFBs) have been widely concerned because of their price advantage. However, the low electrochemical activity of Cr 3+ /Cr 2+ redox couples and the side hydrogen evolution reaction limit the industrial application of ICFBs. A multi-dimensional Bi/carbon composite electrocatalyst (Bi@C) for ICFB is designed and prepared to improve the electrochemical activity of Cr 3+ /Cr 2+ redox couples. Benefiting by using the Bimetal organic framework (Bi-MOF) with solid matrix as precursors, Bi nanospheres are highly dispersed on the Bi@C electrocatalyst that effectively enhances the electrochemical activity. The special morphology of Bi@C electrocatalyst helps the transfer of electrons and ions, significantly reducing the polarization of battery. Herein, the 3D porous carbon frames accelerate mass transfer, and the 2D carbon nanobelts and carbon layer coating on 0D Bi nanospheres improve the conductivity of Bi nanospheres. Therefore, the ICFB with multi-dimensional Bi@C electrocatalyst exhibits coulombic efficiency of 98.10% and energy efficiency of 79.14% at 140 mA cm −2 , which is higher than ICFBs with commercial graphite carbon electrocatalyst and with heat treatment carbon felt. This work provides a simple and economical method to fabricate a high-performance multidimensional Bi@C electrocatalyst for Cr 3+ /Cr 2+ redox couples, boosting the development of ICFBs.
研究领域:
能源材料
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Wenhao Guan,Zhijia Fang,Yinyan Chen,Yongbin Li,Zhilan Peng,Lijun Sun,Qi Deng,Ravi Gooneratne
As one of the most accumulative toxic heavy metals, cadmium (Cd) poses a major threat to human health. Bacterial siderophores, as small molecules with metal-absorbing ability, have great potential activity for Cd-reduction. In this study, the siderophore-producing bacterialstrain FCH-CR2 was isolated from a high-Cd contaminated soil using the CAS method. Leclercia adecarboxylata was identified through 16S rRNA sequence, homology analysis, colony morphology, physiological and biochemical tests. A siderophore, catechol type 2,3-dihydroxy-N-benzoyl- l -serine (DHBS) secreted by FCH-CR2, was purified using RP-HPLC and identified by LC-MS/MS. Intraperitoneal injection of DHBS significantly increased fecal Cd levels, and reduced Cd accumulation in organs. In density flooding theory (DFT) analysis, DHBS may bind to Cd via the hydroxyl site on the benzene ring. Besides, the isothermal titration calorimetry (ITC) assay revealed that the formation of Cd-DHBS is a spontaneous and endothermic reaction with ΔG = −21.4 kJ/mol and ΔH = 1.51 ± 0.142 kJ/mol.
研究领域:
环境科学
·
微生物学
·
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）