Energy Material Advances
·
2024
·
IF 14.8
Yanbing Han,Jiao Fang,Han Zhang,Yiyang Sun,Yifang Yuan,Xu Chen,Mochen Jia,Xinjian Li,Han Gao,Zhifeng Shi
Chalcogenide perovskites represent a promising class of materials known for their robust stability, environmentally friendly composition, and intriguing optoelectronic characteristics. Their A-site cation is largely dependent on nonmagnetic Ca, Sr, Ba elements, showing little influences on the optoelectronic properties of chalcogenide perovskites. Here, by introducing magnetic element Eu as A-site cation, we present a comprehensive investigation into the crystal structures, band characteristics, optoelectronic features, and magnetic behaviors of EuHfS3, targeting for photovoltaics. EuHfS3 adopts a distorted perovskite structure within the Pnma space group. This structure allows for various magnetic configurations, setting foundations for multiple photovoltaic effect. The conduction band maximum primarily originates from the Hf 5d orbitals, akin to SrHfS3. Intriguingly, the presence of Eu spin-up 4f orbitals lifts the covalence band minimum, consequently narrowing the band gap of EuHfS3 (1.6 eV), which is suitable for absorber layer in p-i-n junction solar cells. Moreover, zero field cooled magnetization measurements reveal antiferromagnetic behavior in EuHfS3, indicating further spin photovoltaic effect. The integration of magnetic properties into chalcogenide perovskites, in conjunction with their inherent semiconducting attributes, holds promise for future advancements in photovoltaics and other spintronic device technologies.
研究领域:
材料科学
·
光电子学
·
磁学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Zhouwei Miao,Xiaogang Gu,Shuguang Lu,Mark L. Brusseau,Xiang Zhang,Xiaori Fu,Muhammad Danish,Zhaofu Qiu,Qian Sui
The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO radical oxidation in both the chelated and non-chelated systems, while O 2 − also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO in the first 10 min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materiomics
·
2021
·
IF 6.425
Jing Chen,Nan Su,Xiao Li Zhu,Xiao Qiang Liu,Jin-Xing Zhang,Xiang Ming Chen
BiFeO 3 has been recognized as one of the most important room-temperature single-phase multiferroic materials, but it still suffers from several drawbacks especially the weak magnetoelectric coupling. In the present work, the electric-field-controlled magnetism is achieved in Bi 1-x Gd x FeO 3 system, which involves a field-induced transition of Pna 2 1 / R 3 c at the morphotropic phase boundary region, and the magnetic state is switched between cycloidal state and canted antiferromagnetic state. The electric-field-controlled magnetism becomes reversible with the help of annealing, which is confirmed by magnetic hysteresis loops and the quantitative ratio of the involved phases for the as-sintered, as-poled and as-annealed samples. Compared with the systems of Bi 1-x Nd x FeO 3 and Bi 1-x Sm x FeO 3 , it is easier to tune the symmetry from R 3 c to Pna 2 1 with lower rare earth-content, and the field-induced transition is more apparent and subsequently leads to more significant electric-field-controlled magnetism in a wider composition range.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haohong Xian,Haoran Guo,Jiaojiao Xia,Qiru Chen,Yonglan Luo,Rui Song,Tingshuai Li,Enrico Traversa
Nitrogen can be electrochemically reduced to produce ammonia, which supplies an energy-saving and environmental-benign route at room temperature, but high-efficiency catalysts are sought to reduce the reaction barrier. Here, iron-doped α-MoO3 nanosheets are thus designed and proposed as potential catalysts for fixing N2 to NH3. The α-MoO3 band structure is intentionally modulated by the iron doping, which narrows the band gap of α-MoO3 and turns the semiconductor into a metal-like catalyst. Oxygen vacancies, generated by substituting Mo6+ for Fe3+ anions, are beneficial for nitrogen adsorption at the active sites. In 0.1 M Na2SO4, the Fe-doped MoO3 catalyst reached a high faradaic efficiency of 13.3% and an excellent NH3 yield rate of 28.52 μg h–1 mgcat–1 at −0.7 V versus reversible hydrogen electrode, superior to most of the other metal-based catalysts. Theoretical calculations confirmed that the N2 reduction reaction at the Fe–MoO3 surface followed the distal reaction path.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Hai Yan,Bingqiao Yang,Mengyuan Zeng,Pengliang Huang,Aiping Teng
Molybdenite and chalcopyrite is generally separated through the selective depression of chalcopyrite using potentially toxic depressants such as sodium sulfide and cyanides. In this work, xanthan gum (XG), a polymer polysaccharide, was investigated as a potential molybdenite depressant in copper-molybdenum sulfides separation. Single mineral flotation tests indicated that molybdenite could be effectively depressed by XG, while chalcopyrite was slightly affected. The artificial mixed minerals flotation tests proved that molybdenite and chalcopyrite could be selectively separated with the addition of XG. The adsorption mechanism was studied through zeta potential and infrared spectroscopy measurements. The results revealed that XG mainly adsorbed on molybdenite surfaces other than chalcopyrite. In a word, the experiments results illustrated that XG could be applied as a promising depressant in the selective flotation separation of molybdenite and chalcopyrite, which has the advantage of environment compatibility over conventional copper depressants.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Meixia Wu,Yifeng Han,Xiang Zhou,Xihui Liang,Shuang Zhao,Man-Rong Li
Controlling and modulating the magnitude and signs of electric polarization in multiferroics are very important for practical applications. The magnetoelectric effect in multiferroic materials enables the control and tailor of electric polarization by a magnetic field or vice versa . However, there are rare investigations about the mutual control of the magnitude and signs of electric polarization in multiferroics . Here, we successfully synthesized single crystals of Y-type hexaferrites Ba 0.8 Sr 1.2 Co 2 Fe 12- x Al x O 22 ( x = 0 and 1.08) via flux method. The magnetization, magnetodielectric and magnetoelectric properties were investigated. We found that Al-doping increased the conical magnetic structure transition temperatures and enhanced the magnetoelectric properties. Most importantly, both samples exhibited reversal and non-reversal polarizations at low and high temperatures, respectively. In addition, Al-doping can stabilize the non-reversal ferroelectric polarization, possibly originating from the different field-dependent magnetic structure transitions.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Shirong Lin,Yingzhi Meng,Changbing Pan,Zhi Yuan,Luanhai Ou,Shanjun Ke,Changzheng Hu,Xiuyun Lei,Laijun Liu
In recent years, catalytic degradation driven by mechanical-energy tribocatalysis has gained much attention. Point defects play very important on the catalytic activity of ferroelectric oxides. In this study, we focus on the influence of oxygen vacancies on the catalyst performance of ferroelectric oxide KSr 2 Nb 4 TaO 15 (KSNT) with a tetragonal tungsten bronze structure. The concentration of oxygen vacancies is modified by sintering atmosphere. The KSNT sintered in N 2 atmosphere exhibits the best tribocatalytic degradation efficiency of 96.7% within 2 h for degradation rhodamine B due to high concentration of oxygen vacancies. The excellent degradation efficiency is attributed to the defect energy level of KSNT and high electron–hole separation efficiency. This work reveals the relationship between oxygen vacancies and tribocatalysis efficiency, which is helpful to design and modify the new ferroelectric oxides for tribocatalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 10
·100528
·
IF 4.316
Zhanwei Xu,Hao Yan,Kai Yao,Kang Li,Jiayin Li,Keren Jiang,Zhi Li
Efficient catalysts for the reduction reaction of SOCl2 are desired for lithium/thionyl chloride batteries with high and stable voltage. In this work, iron phthalocyanine particulates fixed on activated carbon substrates (FePc/AC) are synthesized by an in situ solid approach under the temperatures lower than 300 °C. U–T curves, the value distance to the average U, dU/dT via mathematical differentiation and numerical analysis were employed to investigate to the catalytic reduction of SOCl2 systematically. The U–T curve of the battery containing the FePc/AC displays almost perfect rectangle profile. The average voltage of the battery contains the FePc/AC is 3.00 V, 0.21 V higher than that without the catalysts. After discharge, the surface of the carbon cathode containing FePc/AC displays a well-constructed loose morphology composed of LiCl nanoparticles around 100 nm in diameter. The inside of carbon cathode shows a dense morphology with a mount of nano holes around 50 nm, indicating that the formed LiCl permeates into the interior of the carbon cathode, attributing to that the FePc/AC nanocomposite catalysts facilitate the reduction of SOCl2, leading the formation loose LiCl film in nano scale for electrolyte SOCl2 and the formed LiCl diffusion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Fengli Shao,Yingjie Wang,Yingrong Mao,Ting Shao,Jingge Shang
Biochar supported nanosized iron (nFe(0)/BC) was synthesized and used as a persulfate (PS) activator to degradation tetracycline (TC). The influence of the initial pH values, PS and nFe(0)/BC dosage, initial TC concentration, and coexist anions were investigated. In the nFe(0)/BC–PS system, TC could be effectively removed at various pH values (3.0–9.0). The degradation efficiency of TC (100 mg/L) was 97.68% using nFe(0)/BC (0.4 g/L) and persulfate (1 mM) at pH 5.0. Coexisting ions (HCO 3 − and NO 3 − ) had an inhibitory effect on TC degradation. The removal of TC could be fitted by a pseudo-second-order model. Electron-Spin Resonance (ESR) analysis and scavenging tests suggested that sulfate radicals (SO 4 · − ) and hydroxyl radicals (HO·) were responsible for TC degradation. Details of the advanced oxidation process (AOP)-induced degradation pathways of TC were determined based on liquid chromatography mass-spectrometry (LC–MS) analysis. The nFe(0)/BC could still maintain 86.38% of its original removal capacity after five cycles. The findings of this study proved that nFe(0)/BC can be applied to activate PS for the treatment of pollution caused by TC.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Qiubei Gu,Jing Liu,Yixuan Yang,Runliang Zhu,Lingya Ma,Xiaoliang Liang,Shiqin Long,Jianxi Zhu,Hongping He
Ion-adsorption rare earth deposits (IAREDs) are important source for rare earth elements (REEs). The transportation, accumulation, fractionation, and leaching of REEs in IAREDs are mainly controlled by the interactions between REEs and mineral geosorbents. The coexisting ions can significantly affect the mineral-REEs interactions, which, however, are not currently well studied. This work investigated the effects of sulfate (SO 4 2− ) on the adsorption of REEs on kaolinite and ferrihydrite, two typical mineral geosorbents in IAREDs with distinct surface properties. The obtained results indicate that, with increasing SO 4 2− concentration, the adsorption of REEs is hardly changed on kaolinite but remarkably enhanced on ferrihydrite. Additionally, SO 4 2− can particularly improve the adsorption of middle REEs on ferrihydrite. The in situ ATR-FTIR spectra results, coupled with 2D correlation spectroscopic analysis, indicate that the promoted adsorption of REEs by SO 4 2− on Fh is attributed to both the electrostatic attraction and the formation of Fe-REE-SO 4 ternary complexes. However, the negatively charged kaolinite can hardly adsorb SO 4 2− because of the strong electrostatic repulsion between them. Desorption experiments reveal that REEs can be more efficiently desorbed by NH 4 Cl from kaolinite than from ferrihydrite. The obtained results suggest that coexisting oxyanions have profound effects on the mineral-REEs interactions, which should be taken into consideration while exploring the transportation, accumulation, and fractionation of REEs in IARED.
研究领域:
矿物学
·
环境科学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Xiulun Sun,Xinjie Liu,Rongmei Liu,Xueying Sun,Anran Li,Wen Li
We reported a new and facile synthesis route to prepare polyaniline (PANI) nanowire@Co-Fe LDHs nanosheets in two steps. The PANI@Co-Fe LDHs has excellent OER activity with a small overpotential of 261 mV at the current density of 10 mA·cm −2 and a small Tafel slope of 67.85 mV·dec −1 . The PANI@Co-Fe LDHs also has long-term performance and stability. The excellent electrocatalytic performance of the catalyst depends on the good electrical conductivity of PANI and the effect of the two-dimensional (2D) layered structure of Co-Fe LDHs. The work opens a new application for energy storage and conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 8
·期 5
·1197-1204
·
IF 5.958
Xiao-Qin Xu,Hua Zhang,Xue-Qin Huang,Yu-Ling Liu
Ferroelastic materials have attracted wide attention due to their great application prospects in energy and information conversion, data storage applications, etc. In this report, we designed and synthesized an organic–inorganic hybrid halide perovskite ferroelastic (TMTB)CdCl3 (TMTB: N,N,N-trimethyl-tert-butylammonium) under the quasi-spherical strategy. (TMTB)CdCl3 shows a structural phase transition at around 356 K (Tc). In the ferroelastic phase, a quasi-spherical TMTB cation is orientationally ordered with the symmetry of mmm. Above the Tc in the paraelastic phase, the crystal symmetry of 6/mmm compels the TMTB cation with multiple orientations showing spherical distribution. The phase transition with an Aizu notation of 6/mmmFmmm agrees well with one of the 94 ferroelastic species. Under a polarized light microscope, the evolution of ferroelastic domains was visually observed. The calculated spontaneous strain value of (TMTB)CdCl3 is 0.0507 based on the lattice parameters. Moreover, (TMTB)CdCl3 shows prominent ‘ON’/‘OFF’ dielectric switches with good reproducibility. Theoretical calculations based on density functional theory (DFT) were further performed to explore the ‘spherical’ – ‘quasi-spherical’ variation of the TMTB cation. This work demonstrates that the quasi-spherical molecular strategy provides a shortcut for discovering new molecular ferroelastic materials, and also provides guidance for the directional design of functional materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
应用物理
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）