ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Zhigang Zhao,Tingting Yu,Yingchun Miao,Xiangyu Zhao
Finding and optimizing the appropriate cathode materials in the electrolyte are critical to the development of chloride ion batteries. Herein, chloride ion-doped polyaniline/carbon nanotubes (PANI/CNTs) composite materials, which were prepared by an in situ chemical oxidative polymerization method using FeCl 3 ·6H 2 O as the oxidant, have been developed as new cathodes for chloride ion battery. The PANI/CNTs cathode showed reversible electrochemical energy storage through redox reactions of nitrogen species and chloride ion transfer, as confirmed by the results of the electrochemical testing and X-ray photoelectron spectroscopy. The structural configuration of PANI by the incorporation of conductive CNT carrier contributed to significant improvement in the electrochemical properties . More than 80 mAh g −1 stable capacity and a high Coulombic efficiency of about 99% were delivered. This work offers a promising strategy for designing chloride ion storage electrode and novel electrochemical systems.
研究领域:
电化学
·
材料科学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-10
·
IF 5.479
Li Bo,Ma Hong,Zhang Bo,Qian Jing,Cao Ting,Feng Haitao,Li Wu,Dong Yaping,Qin Wenwu
The authors describe the preparation of carbon dots (CDs) that display both blue (~ 410 nm) and yellow (~ 565 nm) emission peaks. The CDs was synthesized by solvothermal treatment of o-phenylenediamine in aqueous ethyl alcohol at pH ~7.0. The CDs are shown to be useful fluorescent probes for pH values in that the ratio of fluorescences at 565 and 410 nm strongly depends on the pH value in the range from 4.5–6.5 and 10.0–13.0, respectively. The blue fluorescence is quenched by 91% by 100 µM solutions of Hg(II) through an electron transfer process, and is restored by 97% an addition of chloride (0.5 mM). The yellow fluorescence, in contrast, is hardly affected. The ratio of fluorescences at 414 and 565 nm drops linearly in the 30 to 60 μM of Hg(II) concentration range, and the limit of detection is 60 nM. Fluorescence is linearly restored in the 70 to 180 μM chloride concentration range, and the LOD is 2.8 nM. Both the blue and the yellow emission are reduced by Cr(VI) (chromate) due to an inner filter effect at pH 3.0. The ratio of fluorescences (410/565 nm) drops linearly in the 20 to 250 μM Cr(VI) concentration range, and the LOD is 260 nM. The method was utilized to analysis of chloride in salt lake brine and of Cr(VI) in spiked tap water.
Schematic presentation of carbon dots with pH-dependent dual emission (at ~ 410 nm and ~ 565 nm). They are shown to be viable fluorescent probes for ratiometric sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2024
·
IF 7.4
Hongtao Yu,Qujian Li,Ji-Hua Zhu,Feng Xing
The anodic degradation process of carbon fibres (CFs) in carbon-fibre-reinforced-polymer (CFRP) composites was first examined under varying operating currents, particularly in the pore solution of seawater and sea sand concrete. A range of analytical techniques were employed to provide insights into the formation and characteristics of the decomposition products generated in the electrolyte and precipitate. The electrochemical reactions of anions and carbon occurred under the different potential significantly influence the corrosion behaviour of CFRP. The production of diverse forms and quantities of carbon oxides primarily arises from the oxidative deterioration of CFs' graphitic structure. These results reveal the anodic degradation behaviour of CFs, which contributes to the anodic degradation mechanism of CFRP materials, especially when exposed to different current levels in high-chloride and high-alkaline conditions.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Dongmiao Li,Min Lin,Jiangjie Zhang,Chengwei Qiu,Hui Chen,Zhen Xiao,Jinni Shen,Yuanhui Zheng,Jinlin Long,Wenxin Dai,Xuxu Wang,Xianzhi Fu,Zizhong Zhang
Halogenated methane serves as a universal platform molecule for building high-value chemicals. Utilizing sodium chloride solution for photocatalytic methane chlorination presents an environmentally friendly method for methane conversion. However, competing reactions in gas-solid-liquid systems leads to low efficiency and selectivity in photocatalytic methane chlorination. Here, an in situ method is employed to fabricate a hydrophobic layer of TaO x species on the surface of NaTaO 3 . Through in-situ XPS and XANES spectra analysis, it is determined that TaO x is a coordination unsaturated species. The TaO x species transforms the surface properties from the inherent hydrophilicity of NaTaO 3 to the hydrophobicity of TaO x /NaTaO 3 , which enhances the accessibility of CH 4 for adsorption and activation, and thus promotes the methane chlorination reaction within the gas-liquid-solid three-phase system. The optimized TaO x /NaTaO 3 photocatalyst has a good durability for multiple cycles of methane chlorination reactions, yielding CH 3 Cl at a rate of 233 µmol g −1 h −1 with a selectivity of 83%. In contrast, pure NaTaO 3 exhibits almost no activity toward CH 3 Cl formation, instead catalyzing the over-oxidation of CH 4 into CO 2 . Notably, the activity of the optimized TaO x /NaTaO 3 photocatalyst surpasses that of reported noble metal photocatalysts. This research offers an effective strategy for enhancing the selectivity of photocatalytic methane chlorination using inorganic chlorine ions.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Junjun Chang,Yuping Li,Feng Duan,Chunlei Su,Yujiao Li,Hongbin Cao
Common methods in capacitive deionization (CDI) for selective removal are derived from membrane separation mechanism or size-based intercalation mechanism. In this study, based on the electrochemical activity of bismuth (Bi) material to chloride ions (Cl − ) and inertness to sulfate ions (SO 4 2− ), Bi electrode is used as anode in CDI to selectively remove Cl − ions from mixed NaCl and Na 2 SO 4 solution. Through the reaction with Bi, Cl − ions are stored in bismuth oxychloride (BiOCl). Results show that Bi electrode exhibits selectivity for Cl − over SO 4 2− with a selectivity coefficient of more than 1.5 in solutions with mole ratio of Cl − to SO 4 2− larger than 1. The selectivity coefficient is greatly dependent on the mole ratio of Cl − to SO 4 2− and increases when the ratio rises. In solution with a fixed Cl − /SO 4 2− mole ratio, higher applied voltage and prolonged time result in higher Cl − ion removal capacity, but not necessarily better selectivity. The highest selectivity coefficient of 4.5 is achieved in 8.5 mM NaCl and 1.1 mM Na 2 SO 4 mixed solution at voltage of 1.6 and 2.0 V after charging for 1 h. These results demonstrate that Bi electrode can selectively remove Cl − ions from mixed solution with a relatively lower concentration of SO 4 2− ions, which provides new insights into ion separation and selective removal by CDI.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2021
·Vol. 13
·期 13
·1724
·
IF 3.103
Liping Liang,Fenfen Xi,Liubiao Cheng,Weishou Tan,Qiang Tang,Xu Meng,Zhenjiong Wang,Bo Sun,Aijie Wang,Jian Zhang
The coupling use of the heterogeneous Fenton-like process (zero-valent iron (Fe0)/H2O2) and weak magnetic field (MWF) for bisphenol A (BPA) abatement was systematically investigated in this study. Though both the Fe0/H2O2and WMF-Fe0/H2O2processes are sensitive to pH, WMF remarkably enhanced BPA removal under the pH range of 3.0–6.0 by 0.5–9.5 times. The characterization of Fe0confirmed the role of WMF in promoting the corrosion of Fe0. Radicals, rather than Fe intermediates, were responsible for BPA degradation. Due to the presence of Cl–as the background ions and its reactivity towards HO•, reactive chlorine species (RCS, i.e., Cl•and Cl2•−) were produced and considerably contributed to BPA degradation. In addition, ~37% and 54% of degraded BPA was ascribed to RCS in the presence of 2 and 100 mM of Cl−, respectively. However, 1.9 mg/L of ClO3−was detected in the presence of 2 mM of Cl−in the WMF- Fe0/H2O2process. HCO3−could diminish ClO3−generation significantly through transforming RCS. The concentration of ClO3−decreased by 74% and 82% with dosing 1 and 10 mM HCO3−, respectively. The results of this study suggest that the WMF-Fe0/H2O2process is a promising approach for BPA removal.Keywords:bisphenol A;zero-valent iron;hydrogen peroxide;weak magnetic field;chloride
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qingming Song,Ya Liu,Lingen Zhang,Zhenming Xu
With a huge amount of waste liquid crystal displays (LCDs) generated annually, their proper recycling raises continuous concern to realize pollution control (heavy metal and liquid crystal) and resource recovery (indium). However, due to their multi-metal feature, traditional hydrometallurgy lacks of sufficient selectivity, which makes the recycling route lengthy, costly, and generate more waste. Electrodeposition acts as a promising technique for selective metal extraction from multi-metal system due to its high selectivity and electron as clean reagent. To fully develop its application in metal recovery, stepwise Cu/MoO 2 and In electrodeposition from In-Cu-Mo-Fe waste LCD leachate is explored in depth. Electrochemical behavior analysis shows Cu and MoO 2 can be first electrodeposited for their higher electroreduction potential. Cl - plays a key role in accelerating indium electroreduction kinetics, which largely shortens the extraction time without the sacrifice of current efficiency . This accelerating effect is attributed to the increased concentration of electroactive species or collision frequency . Under optimized condition, 99.41% of indium (> 99% purity) can be electrodeposited within 13 h with high current efficiency. This study provides a cleaner approach for waste LCDs recycling and gives implications for the potential application of electrochemical technique in e-waste recycling.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dewen Zhou,Qinglong Luo,Guoliang Nie,Mingzhe Dong,Xiao Du,Haining Liu,Zhijian Wu,Jun Li
High-quality, low-chloride zinc borate is a low-smoke, non-toxic and environmentally friendly flame retardant with improved electrical properties for printed circuit board (PCB), so it can be used as a new type of flame retardant to replace brominated flame retardants. However, the chlorine content of zinc borate itself is high, and long-term use of zinc borate circuit boards will cause leakage and may cause a fire. To solve this problem, commercially available zinc borate (analytically pure) with a high chlorine content was used for the study. The presence of chloride ions in zinc borate was determined by X-ray photoelectron spectroscopy (XPS) and point of zero charge (PZC) and found to be mainly in the form of soluble salts and electrostatic adsorption. Based on the existing form of chloride ions, the synergistic technology of electrodialysis and washing with Na 2 CO 3 solutions was used to remove most of the chloride ions from zinc borate, and the removal effect was up to 94.03%. The optimal process was optimized by the reaction surface curve method, the separation kinetics and electrical properties were investigated, and the membrane lifetime was evaluated. Zinc borate can be used as a flame retardant in printed circuit boards after contrast treatment. This study provides an important reference and guide for the removal of impurity ions from other inorganic flame retardants. In addition, it provides technical support for the production of high-quality zinc borate flame retardants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 5
·451
·
IF 2.4
Chunli Cai,Qian Wang,Changsheng Yin,Xuhuan Li,Rong Yang,Xiaodong Shen,Wenbo Xin
AgCl microcrystals are used in visible light photocatalysis. However, their properties depend strongly on the morphology of the crystals and the degree of exposure of the crystal planes. Despite extensive research conducted on the synthesis of AgCl microcrystals, the majority of existing studies have focused on the stable growth of crystals. The role of Cl−ions concentration as a key factor controlling the microcrystals morphology has not been fully explored, which limits the precise tuning of the morphology of AgCl microcrystals. In this study, AgCl microcrystals with controllable morphology are successfully synthesized by a facile solvothermal method. During the preparation process, ethylene glycol (EG) is utilized as a solvent, while polyvinylpyrrolidone (PVP) is employed as a surfactant. We systematically investigate the etching mechanism of AgCl microcrystals by analyzing the effect of sodium chloride (NaCl) concentration on their morphology. This investigation involves the integration of diverse characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and geometrical struc-ture analysis. The results demonstrate that Cl−functions as both a surfactant, thereby promoting the nucleation of cubic microcrystals, and as an etchant, selectively etching the crystal surface. The order of selective etching on the crystal surface follows (100) planes > (110) planes > (111) planes. Based on this new mechanism, AgCl microcrystals with various morphologies, such as cube, octopod and dendrite, are successfully prepared, which provides a new idea for the precise design of noble metal halide microcrystals.
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
CORROSION SCIENCE
·
2025
·
IF 8.5
Shiyao Du,Dongfang Jia,Xin Guo,Jinke Wang,Zhibin Chen,Lingwei Ma,Dawei Zhang
The coupling effect of adipic acid and Cl - on the corrosion of SAC305 solder alloy is systematically investigated. Electrochemical measurements prove that Cl - could completely destroy the protectiveness of adipic acid and accelerate metal corrosion. Morphology characterizations and XPS analyses verify that the amount of adsorbed adipic acid on the metal surface is largely reduced due to competitive adsorption of Cl - . TEM and Mott-Schottky tests further reveal that the defect density of the oxide film developed in Cl - environment is three times higher than that in adipic acid, which is responsible for the faster anodic dissolution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2024
·
IF 2.9
Zeng Yanwei,Xu Peng,Liu Guoqiang,Wang Tianguan,Lei Bing,Feng Zhiyuan,Zhang Ping,Meng Guozhe
Chloride-induced corrosion of steel reinforcement is the key factor leading to the degradation of reinforced concrete building durability. Improving the corrosion resistance of oxide scale of rebar has always been a research hotspot in the field of civil engineering materials. A ZIF-8 modified Ce–Sol–gel (ZCS) film was prepared on oxide scale of plain steel rebars by sol–gel method. It is observed that the | Z | 0.01 Hz value of the ZCS film reached 320 kΩ cm 2 , which is about 29 times higher than that of blank rebar in simulated concrete pore (SCP) solution with 0.1 M NaCl. Then, they were inserted into mortar block and curing them in a curing box at T = 20 ± 2 °C and RH = 95 ± 2% for 28 days. Subsequently, these samples were subject to electrochemical impedance spectroscopy in 3.5 wt% NaCl. The | Z | 0.01 Hz value of the rebar with the ZCS film was six times higher than that of the blank rebar after immersing for 20 days, resulting in an overall increase in corrosion resistance for rebar. The results indicated that the modification by ZIF-8 could reduce the porosity of Ce–sol–gel (CS) film and improved the “labyrinth effect” of the film. Additionally, the negative charge on the surface of ZIF-8 in alkaline condition increased the repulsion effect with Cl − , significantly reducing the sensitivity of rebar to Cl − .
研究领域:
土木工程材料
·
防腐蚀技术
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2024
·Vol. 10
·期 49
·
IF 11.7
Chaoyue Gu,Fanzhen Kong,Sen Liang,Xiang Zhao,Bingjie Kong,Tianhe Jiang,Jianan Yu,Qi Li,Yuqing Lin,Shuo Bai,Yuanhua Shao
Chloride ion, a pivotal cerebral anion involved in neuronal inhibition, is implicated in various neurodegenerative diseases. Conventional direct faradaic detection based on electron transfers at solid electrode/solution interfaces has been proven ineffective due to the electrochemically inactive nature of Cl−. Here, we present an approach involving molecularly tailored liquid/liquid interfacial ultramicro iontronics (L/L-UIs) supported at ultramicropipettes filled with organic gel containing lipophilic bis-thioureas ionophores, which represents the first application of amperometric methodology based on electrochemical facilitated ion transfers reactions at a soft L/L ultramicrointerface to achieve in vivo sensing of electrochemically inactive ions, and dynamically tracking cerebral Cl− in vivo. Furthermore, evidence of dynamic neuronal Cl− regulation via KCC2 modulated through GABAB receptors was provided, further substantiating GABAB receptor–mediated Cl−-related neuronal inhibition. The proposed L/L-UIs have notable potential for in situ tracking of other crucial electrochemically inactive ions or ionized biomolecules in vivo, thereby facilitating the study of brain diseases and the diagnosis and treatment of related disorders.
研究领域:
神经科学
·
生物医学工程
·
分析化学
✓ 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）