JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·
IF 2.4
Li Mei,Du Rui,Wei Hedi,Chen Jiayi,Liu Rugeng,Zhang Meng,Han Wei
In order to investigate the influences of the additive (KF) on electrochemistry and deposit morphology of Pr, various electrochemical techniques were used to comparative investigate the electroreduction potential and diffusion coefficient of Pr 3+ and kinetic properties of Pr 3+ /Pr in LiCl–KCl-PrCl 3 before and after the addition of KF at different molar concentration ratios of F − to Pr 3+ ( k ). Cyclic voltammetry, square wave voltammetry, and reverse chronopotentiometry results showed that the value of k ( k = 0, 1, 2, 3, and 4) had no effect on reduction mechanism of Pr 3+ . With the increase of k , the reduction peak potential moved in the negative direction, the diffusion coefficient decreased, and diffusion activate energy increased. Meanwhile, the exchanged current densities ( j 0 ), charge transfer resistances ( R ct ), and activate energies ( E a ) were measured at different k by linear polarization technique, which illustrated that with the increase of k , j 0 gradually decreased, and E a and R ct increased. Furthermore, the electrochemical preparation of Pr aided by KF was explored by potentiostatic electrolysis at different k , and the products were characterized by XRD, SEM, and EDS, which indicated that with the increase of k , the morphology of metallic Pr changed from slender needles to granular. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2018
·Vol. 35
·期 7
·696-702
·
IF 1.547
Xinying Zhang,Chaoqun Wang,Wenbo Chai,Xiaoyan Liu,Yanming Zhang
A superhydrophobic CeO2-modified kapok fiber (SCMKF) was fabricated using CeO2 and octadecyltrimethoxysilane (OTMS) by a simple chemical deposition method. Scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron microscopy, and the wetting behavior of water and oil on the surface were conducted to confirm the formation of CeO2 nanoparticles and the combination of OTMS with the surface. The SCMKF had the superhydrophobicity and good sorption capacity. The contact angle of raw kapok fiber (RKF) was 114.7°, however, that of SCMKF exceeded 150°. Oil absorption capacities of SCMKF for diesel oil, soybean oil, and lubricating oil were 48.65, 58.17, and 62.57 g/g, increased by 76.5%, 51.9%, and 51.9%, respectively, compared with RKF. Sorption of SCMKF could be well described by pseudo second-order kinetics. The SCMKF could reach the adsorption saturation within 3 min. After eight cycles, the oil sorption capacities of SCMKF decreased, but they were still much higher than those of RKF. The SCMKF showed good performance in the separation of oil–water mixture. It is a promising material for cleaning oil spill.
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
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2020
·
IF 3.35
Zexian Zhu,Dongqing Liu,Sizhou Cai,Yankun Tan,Jing Liao,Yuanjian Fang
Two multi-amine, metformin (MTM) and polyethyleneimine (PEI), were used to prepare separative layer of composite membrane through chemical deposition with tea polyphenols (Tph), an inexpensive mixture of nature polyphenols, on a hybrid polysulfone (Psf) membrane. The supporting layer was a blend membrane of Psf, coupling agent treated sepiolite and cetyltrimethylammonium bromide (CTAB). Sepiolite and the surfactant improved surface hydrophilicity of membrane. Pure water flux (PWF) of membranes was increased from 33.97 to 611.46 L m −2 h −1 bar −1 . The optimum mass ratio for MTM to Tph and PEI to Tph were 9.4:1 and 2.4:1 in chemical deposition reaction, respectively. MTM-Tph (MT) surface was negative charged while PEI-Tph (PT) was positive charged. Monomer reactivity determined the thickness of functional layer. Both composite membranes showed dyes rejection capacity at 1 bar. PT layer was thicker than MT, so did its rejection for dyes. The rejection of PT for 5 dyes were all higher than 98% and remained at 99.3% and 98.6% in 200 h for Congo red (CR) and neutral red (NR). PT membrane displayed the potential in textile waste water treatment.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 8
·期 2
·316-325
·
IF 1.821
Fugang Xu,Ying Liu,Shi Xie,Li Wang
In this study, a sensitive hydrazine sensor based on CuxO decorated three dimensional poly(3,4-ethylene-dioxythiophene) (3D-PEDOT) was developed. A 3D-PEDOT–CuxO hybrid was prepared through a facile electrochemical deposition and cyclic voltammetry treatment process. The hybrid material was characterized by scanning microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), Raman, and electrochemical methods. It was found that 3D-PEDOT not only acts as a matrix to increase the loading amount of CuxO and enhances the conductivity, but also directly contributes to the catalytic oxidation of hydrazine. Owing to the synergistic interaction between 3D-PEDOT and CuxO, the 3D-PEDOT–CuxO hybrid displayed obviously enhanced catalysis for hydrazine oxidation with lower overpotential and stronger oxidation current compared to single component CuxO or 3D-PEDOT. The hydrazine sensor based on the 3D-PEDOT–CuxO hybrid exhibited a one order of magnitude wider linear range (0.5 μM to 53 mM), ten-fold lower detection limit (0.2 μM) and higher stability compared to those of the sensor based on CuxO. The proposed sensor was also used for the determination of hydrazine in real water samples with a satisfactory recovery.
研究领域:
材料科学
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2844
·
IF 5.076
Zheng Lu,Hu Zhou,Chao Ye,Shi Chen,Jinyan Ning,Mohammad Abdul Halim,Sardor Burkhanovich Donaev,Shenghao Wang
Iron pyrite is a cheap, stable, non-toxic, and earth-abundant material that has great potential in the field of photovoltaics. Electrochemical deposition is a low-cost method, which is also suitable for large-scale preparation of iron pyrite solar cells. In this work, we prepared iron pyrite films by electrochemical deposition with thiourea and explored the effect of sulfurization on the synthesis of high-quality iron pyrite films. Upon sulfurization, the amorphous precursor film becomes crystallized iron pyrite film. Optical and electrical characterization show that its band gap is 0.89 eV, and it is an n type semiconductor with a carrier concentration of 3.01 × 1019cm−3. The corresponding photovoltaic device shows light response. This work suggests that sulfurization is essential in the electrochemical preparation for fabricating pure iron pyrite films, and therefore for low-cost and large-scale production of iron pyrite solar cells.Keywords:iron pyrite;electrochemical deposition;thiourea;sulfurization
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 3
·2304-2314
·
IF 3.277
Zilan Feng,Daize Mo,Weiqiang Zhou,Qianjie Zhou,Jingkun Xu,Baoyang Lu,Shijie Zhen,Zhipeng Wang,Xiumei Ma
In this work, poly(N-methyl-3,4-dihydrothieno[3,4-b][1,4]oxazine) (PMDTO), a new nitrogen poly(3,4-ethylendioxythiophene) (PEDOT) analogue, was synthesized by an electrochemical deposition method, and the capacitive properties of PMDTO were investigated and compared with those of PEDOT. The structure and morphology of PMDTO were characterized by ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermal analysis. The pseudocapacitive properties of the as-prepared PMDTO electrodes have been examined by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) measurements and electrochemical impedance spectroscopy (EIS) in 0.1 mol L−1 CH3CN–Bu4NBF4 electrolyte solution. The as-prepared PMDTO electrode showed a high specific capacitance of 154.3 F g−1 at a discharge current density of 3 A g−1 and exhibited cycling stability with the maximal capacitance retention of nearly 71% after 500 cycles at a high current density of 10 A g−1. Additionally, the asymmetrical supercapacitor based on PMDTO and PEDOT electrodes exhibited a maximum specific capacitance of 63.5 F g−1 and an energy density of 12.7 W h kg−1 at a power density of 0.59 kW kg−1. These results implied that the PMDTO electrode can be used as a potential electrode material for supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
X.Q. Du,Y.W. Liu,D.C. Chen,Z. Zhang,Y. Chen
In the present work, silane and graphene oxide (GO) nanocomposite was successfully constructed on copper using a facile co-electrodeposition procedure. Structure and composition characterizations revealed that the added GO nanosheets were partially electro-reduced and covalently bonded with silanol groups to form a more compact and uniform nanocomposite, which contributed to the enhanced chemical and mechanical performance of the electrodeposited silane/GO nanocomposite. Electrochemical tests indicated that the corrosion current density was decreased over two orders of magnitude. The protection efficiency was maintained above 99.8% after immersing in 1 mol/L sodium chloride aqueous solution 120 h. Meanwhile, the contact angle and sliding angle of electrodeposited silane/GO nanocomposite varied slightly after abraded 150 cycles, which presented an excellent mechanical durability. According to the above results, this work supplies a feasible and effective strategy for corrosion protection of conducting materials with long-term protectiveness and mechanical robustness in real-life applications.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 26
·12686-12695
·
IF 3.925
Haoyu Jiao,Tingting Feng,Shu Zhang,Mengqiang Wu
The demand for power density has promoted the application of supercapacitors, and one hot study task for supercapacitors is high-energy-density electrode materials, such as transition metal oxides or sulfides. Here, composites of ZnCo2O4/NiCo2S4 (ZCO/NCS) nanosheet arrays on hydrophilic carbon cloth were synthesized and were used in high-performance supercapacitors. The ZCO/NCS composite electrodes were obtained via electrochemical deposition using a mixed solution of MOF-drived ZCO nanoclusters and Ni, Co, S sources. It was found that the acid etching pretreatment for 20 min of the ZIF-8/67 templates would lead to better electrochemical performance of the derived product (labeled as ZCO-20) and the composites with NCS (labeled as ZCO-20/NCS) as well. The effects of deposition conditions on the morphologies and electrochemical properties of the ZCO/NCS products were also investigated. The results showed that the ZCO-20/NCS deposited at −0.9 V for 10 min exhibited a high specific capacitance (2385 F g−1 at 1 A g−1) and excellent rate retention (1868 F g−1 at 10 A g−1, and 990 F g−1 even at 50 A g−1). Further, ZCO-20/NCS was used to assemble a quasi-solid-state asymmetric supercapacitor (ASC) with activated carbon (AC) and PVA/KOH gel electrolyte. ZCO-20/NCS//AC ASC showed a good specific capacitance (161 F g−1 at 1 A g−1 and 131 F g−1 at 10 A g−1), high energy density (57.28 W h kg−1 at 1 A g−1 and 46.50 W h kg−1 at 10 A g−1), high power density (8.0 kW kg−1 at 10 A g−1) and good cycle retention (91.5% after 5000 cycles). Thereby, ZCO-20/NCS could serve as a promising supercapacitor electrode material in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingchun Liu,Kieran P. Dolan,Junxia Liu,Jianqiang Wang,Dewu Long
Dense carbon film coated on 316L stainless steel was achieved by electrochemical deposition in molten fluoride salt (LiF-NaF-KF 46.5–11.5-42.0 mol%, FLiNaK, m.p. 727K) using C 2 2- as the C source. The C 2 2- source was in-situ synthesized in the high temperature eutectic salt by adding mixed Ca/C powders. Results of cyclic voltammetry confirmed the formation of CaC 2 and the obtained C coated 316L samples demonstrate satisfactory electrochemical deposition via synthesized C 2 2- . SEM images show that a dense and tunable thickness of C film can be fabricated in this FLiNaK–Ca/C–CaC 2 system in the range of 2.0–6.0 μm by optimizing the deposition conditions such as concentrations of Ca/C, deposition potentials, temperatures and times. Characterizations of the as-prepared C film by Raman spectroscopy imply that deposited films are predominantly composed of low degree crystallization structures. The anti-corrosion behavior of this coated material was verified by potentiodynamic polarization . Compared to bare 316L material, corrosion rate suppression by a factor of more than 16 was determined for a 4.0 μm C coated 316L sample in 0.1M HCl+0.5M NaCl solution, indicating the coating provides extremely high anti-corrosion performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kai Yuan,Lixia Yuan,Jingwei Xiang,Yaqi Liao,Jie Chen,Yunhui Huang
Lithium–sulfur battery is one of the most promising choices for next-generation batteries due to its high theoretical energy density and natural abundance. However, the sulfur cathode undergoes a stepwise reduction process and generates multiple soluble polysulfide intermediates; for the further conversion from the dissolved intermediates to the final solid product (Li2S), the surface nucleation barrier limits the speed of the electrochemical precipitation, resulting in serious polysulfide diffusion loss and low sulfur utilization. Herein, the trace Li2S (tLi2S) is modified on the carbon fiber (CF) skeleton as preloaded crystal nuclei to boost the electrokinetics of Li2S deposition in the initial cycle. The trace Li2S decreases the nucleation barrier on the modified electrode (tLi2S@CF), resulting in a high initial capacity of 1423 mAh g–1 for the Li2S6 catholyte (0.2 C), which corresponds to a nearly 100% utilization of Li2S6. Furthermore, the trace Li2S nuclei induce a uniform distribution of the redeposited active materials, and the uniform distribution persists in the following cycles, which benefits the cycle life significantly. The sulfur cathode based on the tLi2S@CF matrix maintains a capacity of 1106 mAh g–1 at 1 C rate after 100 cycles. The strategy can provide a new avenue for the rational design of the sulfur cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 20
·6886-6894
·
IF 7.367
Jizhang Yang,Zhi Yang,Lu Hua Li,Qiran Cai,Huagui Nie,Mengzhan Ge,Xi'an Chen,Ying Chen,Shaoming Huang
The oxygen evolution reaction (OER) has been viewed as a critical step in electrochemical energy conversion and storage devices. However, searching for cheap and efficient OER electrocatalysts still remains an urgent task. Herein, we develop a new strategy involving a one-step electrochemical deposition and dissolution method to fabricate hydrophilic porous CoS2/carbon nanotube (CNT) composites (CNT-CoS2). X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy measurements confirm the formation of hydrophilic groups on the surface of the porous CoS2 during electrochemical oxidation. Our design holds several advantages. The electricity conductivity of CoS2 is increased by introducing CNTs as a conductive substrate. The porous nanostructures of CoS2 increase its surface area, and provide paths to promote charge and reactant transfer. The active edge sites modified with hydrophilic groups can increase the content of electrolyte–electrode contact points, increasing the intrinsic catalytic performance of CoS2. These factors allow CNT-CoS2 to achieve a low onset potential of 1.33 V vs. RHE, a stable current density (j) of 10 mA cm−2 at an overpotential of 290 mV, and excellent stability under alkaline conditions compared to that of IrO2. The comprehensive performance of the CNT-CoS2 electrocatalyst is comparable to or better than that of any reported noble metal-free OER catalyst, even RuO2 and IrO2. This facile synthesis strategy involving synchronous electrochemical deposition and dissolution should be easily adapted for large-scale water electrolysis.
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
Alexandria Engineering Journal
·
2023
·
IF 6.8
Nengli Xiao
The use of conductive polymers with excellent electrochemical properties and environmental friendliness is becoming increasingly important in the field of metal corrosion inhibition. To this end, a polypyrrole anticorrosive coating was synthesized on the surface of structural steel Q235 via potentiostatic deposition. By altering the deposition potential value in a stirred ice bath, the best deposition performance was achieved. It was found that potentiostatic deposition could yield effective anticorrosive coatings over a wide voltage range. The electrochemically deposited films were all Ppy films with C 2 O 4 2- . This proposed coating has extended the lifespan of metal materials in civil engineering applications.
研究领域:
材料科学
·
防腐蚀工程
·
环境工程
✓ 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）