APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 6
·1-4
·
IF 1.455
Wen Xiaoyu,Pan Xiaona,Wu Libin,Li Ruinan,Wang Dan,Zhang Jinqiu,Yang Peixia
Lamellar tin deposits were prepared by galvanostatical electroplating from the aqueous acidic-sulfate bath, with gelatin and benzalacetone dissolved in ethanol (A BA+EtOH ) as additive, and their morphologies were investigated by scanning electron microscopy. Cathodic polarization curves revealed that the absorbability of A BA+EtOH on the cathode surface was higher than that of gelatin. X-ray diffraction analysis indicated preferred orientations of tin growth led to the formation of lamellar structure and distortion of tin lattice. The growth mechanism of lamellar tin was also discussed.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2021
·
IF 2.32
S. Krat,Yu. Gasparyan,Ya. Vasina,A. Prishvitsyn,G.De Temmerman,A. Pisarev
Available literature data for beryllium content in D-Be co-deposited layers was modeled using newly developed model. It was shown that the model adequately describes the experimental results. An empirical scaling for the available trap concentrations as a function of deuteron energy was introduced in order to improve the agreement between the experimental data and model predictions. The limited recombination rate describes the co-deposition better than the unlimited one. Assuming two types of traps in the film with detrapping energies of 0.8–0.9 and 1.2–1.3 eV and trap concentrations of 10 at. % and 1 at. %, respectively, and the deuterium implantation energy of 15.6 eV, the average relative deviation between experimental and predicted D/Be values of 1.9 was observed, which is better than the empirical D/Be scalings.
研究领域:
核物理学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xin Lv,Shi Shen,Huiyong Liang,Yanzhen Liu,Haiyuan Yao,Rui Qin,Haihong Chen,Yang Ge,Peng Xiao
Throughout the development of deepwater oil and gas fields, the occurrence of mixed deposition involving wax and hydrate is a prevalent phenomenon. To understand this process, researchers have explored the kinetics and thermodynamic behavior governing the co-deposition of wax and hydrates. It was observed that the Gibbs free energy change of hydrate increases with increasing pressure, while the entropy change experiences a decrease under heightened pressure conditions. The Gibbs free energy change and entropy change of wax crystal precipitation exhibit an increase with rising wax concentration. In a 100 mL sample of simulated crude oil containing 10 vol% moisture and 2.5 wt% wax, the rate of solid phase deposition measures 0.1126 cm 3 /min when the temperature drops from 61 °C to 2 °C. The results exhibit that the dispersion of wax crystals within the oil phase serves to inhibit aggregation phenomenon during hydrate formation and can be effectively used to inhibit hydrate deposition.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Congqing Yang,Chao Gao,Hu Li,Mingxi Pan,Hui Huang
Silver-coated aluminum powder (Al/Ag) are anticipated to replace Ag powder in industrial production. However, the high activity of Al powder and insufficient understanding of the Ag deposition mechanism pose challenges in effectively controlling the Ag deposition process and morphology, thereby restricting which its applications. In this article, a diffusion-deposition competition mechanism is proposed to explain the growth path of Ag atoms on Al surfaces. This mechanism posits that the growth pathway of Ag atom is governed by the ratio between the surface diffusion rate and the deposition rate (V diffusion /V deposition ). Specifically, when surface diffusion dominates (V diffusion /V deposition ≫1), Ag atoms form a conformal layer, whereas the deposition-controlled (V diffusion /V deposition < 1 or V diffusion /V deposition ≪1), Ag atoms tend to form chains or clusters. Surface diffusion must be considered in regulation crystal growth process. By understanding this mechanism, Ag/Al particles with excellent electromagnetic wave (EMW) absorption properties (RL min = −37.8 dB, EAB max = 4.4 GHz) can be prepared simply by controlling only the experimental conditions that affect the surface diffusion and deposition rates. The insights gained from the proposed mechanism offer new ideas for the preparation of other noble metals or inorganic materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2015
·Vol. 13
·期 3
·506-510
·
IF 1.32
Daixiong Zhang,Xueming Li,Yuhua Zhu,Xiaogang Guo,Hongyun He
The coating of nano-Cr 2 O 3 was successfully fabricated via aqueous electrophoretic deposition (EPD). The deposition behavior aqueous nano-Cr 2 O 3 suspension was affected by the added amount of nitric acid. The morphology of electrophoretic Cr 2 O 3 coating was significantly influenced by the deposition voltage. For a suitable EPD, stable aqueous nano-Cr 2 O 3 suspension could be obtained by the addition of 0.0025 M nitric acid, and the suitable deposition voltage was 5 V. For the purpose of increasing deposition rate which was limited by lower deposition voltage, it was suggested to employ higher suspension concentration of Cr 2 O 3 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huazhen Cao,Zhizhou Yue,Huibin Zhang,Guangya Hou,Yiping Tang,Guoqu Zheng
Electrodeposition of refractory metals is a challenging issue in the electroplating field owing to their low reduction potential. Electrodeposition of molybdenum in MoCl 5 -BMIMPF 6 by a cyclic scanning regime was introduced in this paper. Ni-Mo and Pt/Ni-Mo deposits were prepared by underpotential deposition to induce the bulk deposition of molybdenum. The coatings were observed and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The electrochemical behavior of metallic molybdenum in ionic liquids was studied by cyclic voltammetry and chronoamperometry. The results show that the initial nucleation/growth process of molybdenum in MoCl 5 -BMIMPF 6 follows three-dimensional progressive nucleation with diffusion-controlled growth, and the nucleation rate of molybdenum is slow in the ionic liquid system. The effects of supporting electrolytes and sputtering Pt/Ni electrodes were particularly studied. A yellow-brown uniform coating with more refined crystalline grains was obtained on the Ni surface by the addition of NaF due to its positive role in the mass transfer process and good complexing actions that promote nucleation. A gray-white coating with metallic luster was successfully fabricated on the surface of sputtered Pt/Ni because the substrate with a high work function is benign to molybdenum growth at a lower temperature and more positive potentials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yuan Wang,Wenqi Zhang,Yuyang Qi,Shaofu Wang,Pei Liu,Xiaoyun Wei,Yanhua Yu,Weiwei Sun,Xing-Zhong Zhao,Yumin Liu
Metallic Li, with ultrahigh theoretical capacity (3860 mA h g −1 ) and the lowest electrochemical potential (−3.04 V vs. the standard hydrogen electrode), is perfectly meet the needs of high energy density lithium batteries . However, the direct use of metallic lithium as anode would cause serious dendrite and huge volume expansion, which will bring safety hazards and restrict the practical commercialization of Li metal anodes . Herein, a facile electrophoretic deposition (EPD) method was employed for the first time to fabricate uniform TiN modified commercial Cu foam (TiN@Cu foam) as the lithiophilic 3D conductive skeleton. The lithiophilic TiN acts as the well-distributed seeds to promote the uniform lithium deposition, attributing to the lowed nucleation overpotential. The porous and conductive Cu foams can further mitigate the formation of Li dendrites, on account of its high specific surface area reduce the effective current density. The TiN@Cu foam based half cells and symmetric cells both exhibit improved reversibility and reduced polarization voltage in lithium plating/stripping process. Furthermore, better rate performance and cycling stability were also achieved in the full-cell configurations of TiN@Cu foam-Li/Li 4 Ti 5 O 12 (LTO) and TiN@Cu foam-Li/LiFePO 4 (LFP). This work demonstrates a facile strategy to modify the commercial current collectors with pre-synthesized lithiophilic nanoparticles for achieving uniform Li deposition.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ECOLOGICAL INDICATORS
·
2015
·
IF 3.444
Yanjie Qi,Shibin Hu,Shouliang Huo,Beidou Xi,Jingtian Zhang,Xiaowei Wang
Sediment samples were collected from the Chaohu Lake basin to investigate the spatial distribution and historical deposition behaviors of 17 perfluoroalkyl substances (PFASs). Concentrations of the total PFASs (∑PFASs) in limnetic sediments ranged from 0.719 to 2.429 ng/g dry weight (dw), with an average of 1.449 ng/g dw. A clear gradient in the spatial distribution was observed from west to east in surface sediments of Lake Chaohu. Perfluorooctane sulfonic acid and perfluorooctanoic acid were predominant in limnetic sediments, with an average of 0.383 and 0.275 ng/g dw, respectively. The ∑PFASs concentrations in riverine sediments were the highest in the Shiwuli River, followed by the Nanfei River. PFASs in riverine sediments indicated that industrial discharge and urban runoff played key roles in PFAS distribution and pollution levels. In vertical profiles, concentrations of the ∑PFASs and PFAS congeners in three sediment cores generally increased with decreasing depths, indicating that the input history of the ∑PFASs could be attributed to the development of industrialization and urbanization in the Chaohu Lake basin. The correlations between PFASs and sedimentary characteristics, organic carbon, nutrients and inorganic salts suggested that both hydrophobic and electrostatic effects played important roles in PFAS distribution and pollution levels in sediments of Lake Chaohu.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
BMC Chemistry
·
2022
·Vol. 16
·期 1
·1-10
·
IF 4.095
Xiang Qing,Qin Jiyao,Qin Taihong,Chen Lu,Zhang Daixiong
Electrophoretic deposition (EPD) coating has become a hot topic due to its simple experiment, wide application, and wide material range. In this study, the PTFE coating was successfully prepared by electrophoretic deposition through the systematic study of electrophoretic deposition kinetics. In particular, in the dispersion system with ethanol as solvent, Nafion and NaOH were simultaneously added as additives to obtain a beneficial synergistic effect on PTFE electrophoretic deposition. And the best additive scheme is: when the concentration of PTFE was 6 g·L− 1 and the deposition time was increased to 20 min, adding 0.10 g·L− 1 Nafion and 0.10 mM NaOH simultaneously. Compared with the scheme with Nafion being only additive, the addition of NaOH can improve the deposition rate from 0.16 mg·cm− 2 to 0.98 mg·cm− 2, and the deposition rate increases by about 6 times. According to electrophoretic deposition kinetics, there is an obvious critical transition time between linear and parabolic regions in the preparation of the coating. Prolonging the arrival of critical transition time is beneficial to effectively achieve stable growth of the coating in a longer time. It is found that a more ideal additive can not only increase the deposition rate of coating, but also significantly accelerate the arrival of critical transition time. Meanwhile, the deposition voltage also has an important influence on the critical transition time. Increasing the voltage can improve the deposition speed but shorten the critical transition time. Therefore, the application of deposition voltage needs to strike a balance between deposition rate and critical time point. The optimal deposition conditions proposed in this work are: deposition voltage 60 V, deposition time 20 min, additive 0.10 g·L− 1 Nafion and 0.10 mM NaOH.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jiangwei Lu,Wenbo Zhuang,Wangfan Yang,Xudong Zhang,Guowen Su,Xiaoxia Gong,Jun Yuan,Jiehe Sui,Yingtang Zhou,Genlin Zhang,Yanfen WAN,Peng Yang
Ultrablack materials are distinguished by their extremely low reflectivity and high absorptivity, which can be used to increase photovoltaic cell efficiency, capture stray light, and design radar camouflage. Black silicon is a type of ultrablack material, the absorptivity of which still has room for improvement. Here, nanostructured black silicon is prepared by a metal-assisted chemical etching method, in which chloroauric acid (HAuCl4) acts as the catalyst. Furthermore, the study demonstrates that due to the deposition of a few layers of PtS2 the number of “hot spots” between the sidewall gaps of bamboo shoot-like protrusions is significantly increased, thereby further improving the absorption of black silicon and enhancing light suppression. The few-layer PtS2 was densely grown on the black silicon by combining the physical vapor deposition (PVD) and the chemical vapor deposition (CVD) methods. Next, the enhanced Raman property of black silicon was explored. These results provide a new idea for the manufacture of excellent photovoltaic and optoelectronic devices in which very high absorption is necessary.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2021
·Vol. 7
·期 4
·1910-1916
·
IF 2.347
Li You-gang,Liu Shan-shan,Wang Chang-hong,Luo Tao,Xiang Chang-liu,Li Shuai,Chang Cong,Yang Sheng-hai,Wang Heng-hui,Chen Yong-ming
The lead (Pb) electro-refining in the green methanesulfonic acid (MSA) system presents an alternative route to the conventional fluosilicic-acid-based Pb electro-refining. Herein, we investigated the electro-deposition behavior of the MSA-based Pb electro-refining by electrochemical measurement and apparent characterization techniques. The operational principle of the Pb deposition was preliminarily understood by performing cyclic voltammetry (CV) complemented with SEM–EDS detection. The results indicated the thermodynamic priority of the efficient Pb 2+ /Pb reduction reaction over the H + /H 2 one. The impact of various factors such as MSA concentration, scanning rate, and temperature on the effectiveness of Pb electro-deposition were investigated by linear sweep voltammetry and electrochemical impedance spectroscopy. Further numeric calculation and model analysis helped acquire in-depth kinetics and mechanism knowledge, such as the discharge form of divalent Pb(II), reversibility of the electrode process, apparent activation energy, reaction order and deposition reaction kinetics. Overall, this work revealed important electrochemical mechanism, principle, and kinetics of the Pb deposition in the MSA-based electro-refining process and would offer a significant guidance in condition optimization of its practice. Graphical Abstract
研究领域:
电化学
·
冶金工程
·
材料科学
·
绿色化学
·
应用化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·
IF 27.4
Yuhan Zou,Yuzhu Wu,Wenze Wei,Changpeng Qiao,Miaoyu Lu,Yiwen Su,Wenyi Guo,Xianzhong Yang,Yuqing Song,Meng Tian,Shixue Dou,Zhongfan Liu,Jingyu Sun
The uneven texture evolution of Zn during electrodeposition would adversely impact upon the lifespan of aqueous Zn metal batteries. To address this issue, tremendous endeavors are made to induce Zn(002) orientational deposition employing graphene and its derivatives. Nevertheless, the effect of prototype graphene film over Zn deposition behavior has garnered less attention. Here, it is attempted to solve such a puzzle via utilizing transferred high-quality graphene film with controllable layer numbers in a scalable manner on a Zn foil. The multilayer graphene fails to facilitate a Zn epitaxial deposition, whereas the monolayer film with slight breakages steers a unique pinhole deposition mode. In-depth electrochemical measurements and theoretical simulations discover that the transferred graphene film not only acts as an armor to inhibit side reactions but also serves as a buffer layer to homogenize initial Zn nucleation and decrease Zn migration barrier, accordingly enabling a smooth deposition layer with closely stacked polycrystalline domains. As a result, both assembled symmetric and full cells manage to deliver satisfactory electrochemical performances. This study proposes a concept of “pinhole deposition” to dictate Zn electrodeposition and broadens the horizons of graphene-modified Zn anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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