APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jie Cheng,Shuo Huang,Yang Li,Tongqing Wang,Lile Xie,Xinchun Lu
Ce 3+ in CeO 2 , rather than Ce 4+ , is believed to provide assistance to the breaking up of Si O bond during chemical mechanical polishing (CMP) of silica. In the paper, lanthanide metals (La, Nd and Yb) doped CeO 2 nanoparticles were synthesized by modified incipient impregnation method in order to improve the content of Ce 3+ in CeO 2 as polishing. X-ray photoelectron spectroscopy (XPS) experiments and density function theory (DFT) calculation demonstrate this approach could achieve surface doping of CeO 2 nanoparticles, and facilitates the formation of oxygen vacancy and Ce 3+ content. CMP experiments show that the polishing rate and the surface quality of silica wafer are obviously improved by using the doped CeO 2 as abrasive particles. Especially for Nd/CeO 2 , content of Ce 3+ increases from 0.146 to 0.235, the polishing rate of silica is accelerated by 29.6% in alkaline slurries, and a better surface quality (Sa = 9.6 Å) is obtained.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Changhua Li,Yi He,Zhijun Li,Hongjie Li,Yang Zhao
Tannic acid (TA) was self-assembled with graphene (Gr) via π-π interaction. Then green corrosion inhibitor cerium (Ⅲ) cation (Ce 3+ ) was loaded on graphene sheets through a reversible complexation with tannic acid which is depending on pH value, enabling the release of Ce 3+ in an acid environment. Characterization methods including fourier transform infrared spectroscopy (FT-IR), raman spectroscopy , transmission electron microscope (TEM), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) mapping verified the successful preparation of Gr-TA and Gr-TA-Ce 3+ hybrid materials . Electrochemical impedance spectroscopy (EIS) results of bare steel in the Gr-TA-Ce 3+ extract showed the self-healing of Gr-TA-Ce 3+ nanofillers which increased the impedance modulus at 0.01 Hz by one order of magnitude compared with bare steel. Waterborne epoxy coating doped with Gr-TA-Ce 3+ material exhibited significant barrier performance originated from shielding property of graphene nanosheets against corrosive mediums and efficient self-healing capacity derived from the protective film formed by cerium cations. Electrochemical impedance spectroscopy results manifested that coating doped with Gr-TA-Ce 3+ material maintained impedance modulus at 0.01 Hz of ~2.90 × 10 7 Ω.cm 2 after immersion in 3.5 wt% sodium chloride solution for 60 days, two orders of magnitude higher than neat epoxy coating.
研究领域:
材料科学
·
电化学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2024
·Vol. 17
·期 13
·4794-4802
·
IF 32.4
Zhengqiang Hu,Fengling Zhang,Feng Wu,Huirong Wang,Anbin Zhou,Yi Chen,Tianyang Xue,Renjie Chen,Li Li
In electrochemical devices, the electric double layer (EDL) theory posits that the potential difference of the Helmholtz layer significantly influences the activation energy and reaction rate of the electrochemical reaction, which determines the uniformity of metal ion deposition. In this work, we compare the differential capacitance of metal cationic sulfate, along with factors such as cost as well as safety, and Ce(SO4)2 is selected to adjust the EDL at the Zn anode/electrolyte interface. Molecular dynamics simulations show the formation of a more compressed diffuse layer with the help of Ce4+, resulting in a decreased potential difference of the Helmholtz layer, an improved Zn2+ deposition overpotential and a reduced Zn electrode corrosion rate. In situ XRD and Raman spectroscopy reveal that Zn2+ deposition is favored along the (002) crystal plane, and hydrogen evolution is hindered. The Ce4+ modified electrolyte enables a Zn anode with high coulombic efficiency (99.6%) over 600 cycles at 10 mA cm−2. The compressed EDL extends the lifespan of the Zn–Zn cell to 2500 hours at 5 mA cm−2 and stable cycling for 300 cycles at 20 mA cm−2 and 10 mA h cm−2. Assembling Zn full cells with high-loading cathodes shows enhanced long-term cycling performance. Our findings reveal the potential of using high-valence metal cations like Ce4+ to regulate the EDL and uniform Zn2+ deposition in ZIBs, which suggests a promising direction for developing electrolytes for practical ZIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Bing Chen,Xvsheng Qiao,Dengfeng Peng,Xianping Fan
In this study, hexagonal-phase NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were synthesized via a mild solvothermal method. By modifying the Eu3+ dopant concentration, the crystal phase, morphology, and luminescent properties were well controlled. A broad excitation band centered at around 260 nm corresponding to the 2F5/2 → 4f-5d transition of Ce3+ was detected in the hosts containing Gd3+ ions by monitoring the Eu3+ emissions, indicating that an efficient Ce3+ → Eu3+ energy transfer occurred via the Gd3+ sublattice. Luminescence decay behaviors of the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were studied, and the energy transfer mechanism was discussed. An obvious rising edge on the luminescence decay curve of Eu3+ ions in the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods was observed. The rising time is proposed to describe the energy migration time from Ce3+ to Eu3+ via the Gd3+ sublattice.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Shihai You,Shuxing Li,Yongchao Jia,Rong-Jun Xie
Traditionally, phosphors are developed by doping activators on standard crystallographic sites of selected inorganic hosts, thus enabling the prediction of their luminescence with some empirical models or theoretical calculations. Here, we propose the idea of interstitial site engineering as a totally different way to design phosphors with promising properties. In detail, a red-emitting phosphor La3Si6N11:Ce3+,Al3+ was developed by engineering the interstitial Ce3+ site, which produces an unusual red emission band (λem = 600–665 nm) under blue light excitation. The origin of this red emission was assigned from the first-principle calculation to the Ce3+ ion occupying the [Si8N8] void in the c∼1/2 layer of which the calculated transition energies matching with experiment within 0.1 eV. Such an interstitial Ce3+ site was created as a charge compensator for the aliovalent substitution of Si4+ by Al3+ ions. The red-enhanced La3Si6N11:Ce3+,Al3+ phosphor showed great potentials for improving the optical quality (i.e., color temperature and color rendition) of laser-driven white light. This work indicates that the interstitial site engineering is an efficient way for generating new luminescence centers and opens up an avenue for designing phosphors with appealing properties.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Gang Li,Yayun Li,Chuanxi Lin,Hao Peng,Yunsheng Xue,Wenfeng Qin,Xin Zhao,Bin Zhou
2024 aluminum alloy has high strength, processing performance, and good damage tolerance performance, but it is prone to intergranular corrosion and pitting. Therefore, the development of corrosion protective coatings is essential for the aluminum alloy. In this paper, cerium ion (Ce 3+ ) was doped into chitosan-modified montmorillonite (Ce-CS-MMT) by ion exchange method, and the corrosion protective performance of Ce-CS-MMT epoxy coating (Ce-CS-MMT/EP) was investigated. The electrochemical analysis of aluminum alloy in cerium-containing solution showed the corrosion inhibition efficiency reached 95.52%. The result indicates the corrosion inhibition effect of cerium-containing solution was better than pure NaCl solution and MMT solution. The corrosion study of the coating illustrates that the protection rate of Ce-CS-MMT/EP reached 95.82%, which was higher than that 91.83% of Ce-MMT/EP. The result indicates the resistance of charge transfer was greater and the better shielding effect for electrolyte corrosion ions than MMT and Ce-MMT epoxy coatings, and the corrosion protective performance was excellent.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yingwei Gao,Shuo Zhang,Bo Ge,Hui Zhao,Chuanyu Jin,Hui Yan,Limin Zhao
The high thermal stability and chemical durability of amide-linked covalent organic frameworks (amide COFs) make them a promising material for a range of new applications. Nevertheless, the low reversibility of the amide bond presents a significant challenge to the direct synthesis of amide-bonded COFs. In this paper, we present a simple method for synthesizing amide COFs. The synthesis of imine-linked COFs was initially achieved through the reaction of 2,4,6-tris(4-aminophenyl)-1,3,5-triazine and 2,5-dimethoxybenzene-1,4-dicarboxaldehyde. Subsequently, amide COFs were synthesized via the oxidation of the imine bond into an amide bond, utilizing ammonium persulfate as the oxidizing agent. Due to the difference of link bond, two COFs separately displayed distinct and significant fluorescence enhancement for Al 3+ and Ce 3+ , which was highly sensitive and less affected by environmental factors. The strategy offers a novel approach to the convenient and environmentally benign synthesis of amide COFs, which may facilitate their wider applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 24
·9501-9510
·
IF 4.569
Jianhong Ding,Meng Kuang,Shuifu Liu,Ziheng Zhang,Kangrong Huang,Jiansheng Huo,Haiyong Ni,Qiuhong Zhang,Junhao Li
Developing novel luminescent materials with ideal properties is an endless project, urged by growing requirements of advances in energy saving, healthy lighting and environmental friendliness. Herein, a series of ScCaOBO3:Ce3+,Mn2+ phosphors with excellent luminescence properties were synthesized by the high temperature solid state method. X-ray diffraction was applied to analyse the phase composition of the obtained phosphors. The morphology and dopant distribution were observed by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS), respectively. The Rietveld refinements and luminescence spectra indicate that Ce3+ preferentially occupies the Sc3+ site and produces a blue emission band at around 460 nm, which originates from the characteristic 5d–4f transitions, while Mn2+ preferentially occupies the Ca2+ site and emits red light due to its characteristic 4T1(4G)–6A1(6S) transitions. Upon excitation at 354 nm, both Ce3+ and Mn2+ emissions can be obtained and further investigations evidenced that the broad and intense light emission of Mn2+ located in the red spectral region is the result of energy transfer from Ce3+ to Mn2+. Theoretical calculations reveal that the energy transfer process from Ce3+ to Mn2+ is of the resonance type and is governed by electric dipole–dipole interactions. Since the ScCaOBO3:Ce3+,Mn2+ phosphors are capable of producing broadband emissions that widely cover the blue and red spectral regions, the introduction of a green light-emitting phosphor CMA:Tb3+ can conveniently generate high quality white light. Therefore, a white light-emitting diode device with extremely high color rendering indices, Ra = 93.7 and R9 = 91.9, was successfully obtained.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
J. Zhang,G.X. Zhang,G.M. Cai,Z.P. Jin
Due to the high sensitivity of the unshielded 5d orbit to the host environment, Ce 3+ has a wide-spread emission ranging from near ultraviolet to the red light region, making it a favorable choice for being UV-emitting phosphor activator and sensitizer of other co-doped lanthanide ions in luminescent materials. In present work, Ce 4+ →Ce 3+ self-reduction phenomenon in the layered phosphate MgIn 2 P 4 O 14 was observed. Noting that self-reduction ability is a valuable characteristic of new host materials, a new viewpoint underlying mechanism was put forward. Structure-, composition-, and temperature-dependence of photoluminescence of the new UV-emitting MgIn 2 P 4 O 14 : Ce x phosphors were investigated, with the relative mechanism discussed. Moreover, the sensitization of Dy 3+ by Ce 3+ was observed in Ce 3+ /Dy 3+ co-doped MgIn 2 P 4 O 14 phosphors. The excitation region of Dy 3+ in MgIn 2 P 4 O 14 : CeDy (220–460 nm) is markedly broadened compared to that of the Dy 3+ single-doped phosphor (270–460 nm) on account of the Ce 3+ →Dy 3+ energy transfer process . Present work shows that the MgIn 2 P 4 O 14 : CeDy phosphor can be promising phosphor using for fabrication of both light-emitting diodes (LEDs) and fluorescent lamps (FLs).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Renping Cao,Yaqin Ran,Xinyan Lv,Longxiang Xu,Huijun Wan,Qianglin Hu,Ting Chen,Chunyan Cao
A series of single doped (Ce 3+ ) and co-doped (Ce 3+ and Mn 2+ ) Ca 8 ZnLa(PO 4 ) 7 (CZLP) phosphors are synthesized in air by using the solid-state reaction method. The crystal structure, morphology, and luminescence properties of the samples are investigated. The blue emission of CZLP:Ce 3+ phosphors is observed in the range of 325–450 nm when they are excited by 315 nm ultraviolet (UV) light, and the optimal Ce 3+ concentration is about 8 mol%. With excitation at 315 nm, a tunable color emission of CZLP:8%Ce 3+ , yMn 2+ phosphors from blue to red is displayed when Mn 2+ concentration is changed from 0 to 12 mol%, and the corresponding chromaticity coordinates are varied from (0.1635, 0.0118) to (0.5885, 0.2829). The spectral propertires and lifetimes confirm the energy transfer (ET) process from Ce 3+ to Mn 2+ ions in CZLP:8%Ce 3+ , Mn 2+ phosphor. The luminous mechanism and ET phenomenon are explained by using the Tanabe-Sugano diagram of Mn 2+ ion and the energy level diagrams of Ce 3+ and Mn 2+ ions. The experimental results are favorable for the improving and adjusting of luminescence properties of other phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2016
·
IF 2.265
Wenjuan Bian,Wei Lu,Yushuang Qi,Xue Yu,Dacheng Zhou,Yong Yang,Jianbei Qiu,Xuhui Xu
The synergistic effect appeared due to the cooperative dual-wavelength excitation by near-infrared (NIR) and ultraviolet (UV) light in rare-earth doped nano-particles (NPs) is very important to improve solar cell efficiency. Herein, we studied the synergistic effect combined with the energy levels of Er 3+ ions and the defect states in KLu 2 F 7 NPs. The introduction of Ce 3+ ions in KLu 2 F 7 :16%Yb 3+ , 2%Er 3+ NPs results in significant improvement of synergistic effect by producing more vacancy defects ( V K ′ ) which serves as shallow traps. We verify unambiguously that the control of the defects distribution exerts a facile approach to promote the synergistic effect with the assistance of Ce 3+ ions doping.
研究领域:
材料科学
·
光物理
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yunlong Li,Miao Liu,Yixian Liu,Lilong Zhou,Jilong Han,Zhengjie Li,Jimmy Yun,Runjing Liu
Two kinds of Ce-doped UiO-66 were synthesized by using CeCl 3 ·7H 2 O and (NH 4 ) 2 Ce(NO 3 ) 6 as cerium precursors, namely Ce(III)- and Ce(IV)-UiO-66. The effect of valence states of cerium precursors on adsorption performance towards Rhodamine B (RhB) was investigated for the first time. Ce atoms are in two valence states of +3 and + 4, where Ce 3+ ions turn their surfaces negatively charged. The higher cerium content (24.8%) and ratio of Ce 3+ /Ce 4+ ions (1.4:1) of Ce(IV)-UiO-66 made its surface more negatively charged, which is contributed to form stronger electrostatic interaction with cationic dyes. The adsorption amounts of RhB were 239.5 mg/g and 431.7 mg/g for Ce(III)- and Ce(IV)-UiO-66, which are 2.38 and 5.11 times higher than pristine UiO-66, respectively. The well-fit Langmuir model and pseudo-second-order model suggest a monolayer chemisorption process. The adsorption mechanism suggests that the electrostatic interaction and the complexation interaction between Ce 3+ and RhB are dominant factors affecting RhB adsorption. Since Ce 3+ severed as adsorption sites, the higher Ce content and stronger electrostatic interaction of Ce(IV)-UiO-66 together promoted its RhB adsorption than Ce(III)-UiO-66. The obtained results help to understand how the mixed-valences of incorporated metals affect the adsorption behaviors of bimetallic MOFs deeply.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）