International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yong Zheng,Qian Wang,Yongjun Zheng,Zhen Wang,Dayong Tian
Electrolytic recovery of pure aluminum is a conventional method for the recycling of waste aluminum alloys, which is very important to economic development and environmental protection. However, the conventional electrolytic recovery process suffers from several inherent problems, which restricts the further development of this technology. In this study, an air- and moisture-stable 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ionic liquid was applied in the dissolution of aluminum chloride. The upper phase of the resulting mixture was used as a low-temperature electrolyte in the electrolytic recovery of pure aluminum. The results of cyclic voltammetry and linear sweep voltammetry showed that aluminum could be electrodeposited from the electrolyte and that the main impurity elements of the aluminum alloy could also be stripped off by the electrolytic method. Based on these measurements, the electrolytic recovery process was conducted at 0.2−0.6 V and 303.2−373.2 K. Scanning electron microscope micrographs showed that smooth, compact and well-adherent deposits were obtained at 0.4 V from 303.2 to 323.2 K. In this situation, the preferred crystallographic orientation of these deposits was the (200) plane. Meanwhile, the mass content of aluminum in all deposits was higher than 99.6% according to the purity characterization. This study may be useful for the further application of ionic liquids in the low-temperature recycling of waste aluminum alloys.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xue Xu,Huile Jin,Qian Ren,Aili Liu,Jun Li,Dewu Yin,Xin Feng,Xiaomei Dong,Jichang Wang,Shun Wang
The focus of this study is to explore ways of accelerating the corrosion rate of copper anodes for the possible synthesis of copper nano-composites on the counter electrode, and the subsequent applications of such composites as nonenzymatic glucose sensor. Normally, a strong corrosion resistance of copper anodes emerges in alkaline solutions due to the formation of a passive copper hydroxide film, which prevents further corrosion. In this research the presence of sulfide ions in the electrolyte was found to dramatically promote the corrosion process and eventually led to the production of CuxO/Cu2S (where CuxO was consist of Cu2O and CuO) nanocomposites on the counter electrode during the electrochemical corrosion process. When the as-prepared copper nanocomposites electrodes were used to detect the oxidation of glucose, a strongly enhanced anodic process was obtained, in which the detection limit was found to be around 10 uM with a linear range of 10-1000 uM and a detection sensitivity of 2688 uA cm -2 mM -1 .
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Journal of Energy Storage
·
2023
·
IF 9.4
Wenhao Fan,Jianxun Zhao,Dayong Liu,Qingcheng Liang,Wanqiang Liu,Xin Guo,Qingshuang Wang,Heng Liu,Peng Chen,Shang Gao,Yong Cheng,Xinwei Wang
The current hydrogen storage alloys used for Ni-MH battery negative electrode are difficult to guarantee excellent performance in terms of discharge capacity and cycle stability. Co 0.9 Cu 0.1 Si alloy has been widely investigated as a negative electrode material for nickel hydrogen battery, but its capacity and cycle stability need to be improved for commercial applications. In this work, Co 0.9 Cu 0.1 Si alloy was prepared by mechanical alloying. Molybdenum carbide (Mo 2 C) was loaded on multi-walled carbon nanotubes (MWCNTs) by in-situ carburizing . In order to improve the electrochemical hydrogen storage performance of Co 0.9 Cu 0.1 Si alloy, 5 wt% MWCNTs, Mo 2 C and molybdenum carbide modified multi-walled carbon nanotubes (Mo 2 C@MWCNTs) were added to Co 0.9 Cu 0.1 Si alloy via mechanical alloying method. The structure and morphology of the composites were characterized by XRD and SEM. The discharge capacity, cyclic stability and high rate discharge performance of the composites were tested, the electrochemical performance of the composites was investigated by three-electrode battery system. The composite materials have better discharge capacity, cycle stability and electrochemical performance compared with the pristine alloy. The Co 0.9 Cu 0.1 Si alloy doped with 5 wt% Mo 2 C@MWCNTs-2 has the best electrochemical hydrogen storage performance among all the composite materials. Its optimal discharge capacity is 609.9 mAh/g and its maximum capacity retention rate is 64.7 %. The enhancement of the electrochemical hydrogen storage performances of the composites are due to the high conductivity and high specific surface area of MWCNTs and the high catalytic activity of Mo 2 C. The synergistic effect of MWCNTs and Mo 2 C can improve the electrochemical hydrogen storage performances of the composites.
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Metals
·
2023
·Vol. 13
·期 7
·1232
·
IF 2.9
Fei Chen,Jiahao Zhao,Hao Wang,Honglin Li,Guanchao Yin,Meirong Cai,Yangwei Wang,Qiang Shen
The nanoporous structure of oil-impregnated porous copper is closely related to its tribological and oil-retention properties, which are essential for its anti-friction and anti-wear, and long-lasting lubrication. In this study, different component Cu-Al precursors were obtained via plasma-activated sintering, followed by a dealloying method to obtain bulk nanoporous copper with different porosities. The effect of the nanoporous structure on oil-retention capacity and tribological properties was investigated. The results showed that as the porosity increased from 47.48% to 67.69%, the oil content increased from 8.01% to 20.18%, while the oil-retention capacity decreased from 97.12% to 33.92% at 7000 r/min centrifugal speed. With the storage of oil, the average friction coefficient was reduced by 68.2–85.9%. The self-lubricating effect can be ascribed to an oil film formed on the surface, and the main wear forms were abrasive wear and fatigue wear. This study may provide guidance for the development of high-performance oil-impregnated lubricating nanoporous copper.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 38
·2301913
·
IF 19
Meng Liu,Guocheng Lv,Hao Liu,Yuqing Fu,Jian Zhang,Libing Liao,De-en Jiang,Juchen Guo
Herein, a self-charging mechanism of rechargeable aluminum (Al) batteries with Chevrel phase molybdenum sulfide (Mo 6 S 8 ) cathode is reported. The results unambiguously reveal that the self-charging is a spontaneous disproportionation of Al intercalated Mo 6 S 8 originated from the dynamic shift of Al between occupied sites during Al intercalating and resting. The theoretical study indicates that the fully Al intercalated Mo 6 S 8 in the format of Al 4/3 Mo 6 S 8 is kinetically accessible driven by electrochemical overpotential but thermodynamically unstable due to the repulsion between Al 3+ cations. This mechanism is a true self-charging with no input of any form of energy, thus distinctly superior to the previously reported self-charging mechanisms. Based on this discovery, a semi-flow Al Mo 6 S 8 battery is designed and demonstrated with long-lasting discharge capability and high capacity.
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POLYMERS & POLYMER COMPOSITES
·
2022
·
IF 1.841
Shidong Zhou,Xiaoxing Niu,Xiuli Zhang,Yuanliang Zhao
The synergistic effect of silica (SiO2) and copper (Cu) nanoparticles in polyimide (PI) on the friction interfacial deformation of polyethersulfone/polyimide (PES/PI) blends was studied. Results indicate that the effect of SiO2 and Cu nanoparticles on the tribological performance of PES/PI nanocomposites is quite different from each other. The addition of SiO2 nanoparticles into PI improves the antifriction of PES/PI nanocomposites by 24.4%, but has little effect on the wear resistance. The incorporation of Cu nanoparticles into PI enhances the wear resistance of PES/PI nanocomposites by 55.5%, but has little effect on the antifriction. PES/PI nanocomposites achieve the better comprehensive tribological performance when the content of SiO2 and Cu is 0.8 wt and 0.2 wt%, respectively. The friction interfacial deformation analysis reveals that SiO2 in PI improve the continuity and uniformity of deformation in friction interface and reduce the severe wear of transfer film. Cu nanoparticles in PI improves the continuity but not the ununiformity of deformation. Thus, the abrasive wear of counterpart ball is severe. The synergistic effect of SiO2 and Cu nanoparticles in PI improves the continuity and uniformity of friction interfacial deformation, which contributes to the improvement of friction and wear of PES/PI nanocomposites.
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FUEL
·
2022
·
IF 8.035
Chaohe Zheng,Mingze Su,Haibo Zhao
As the kinetic influencing factors were not considered properly in the previous studies, the obtained activation energies of copper oxidation were discrepantly ranging from 15.0 kJ/mol to 100.0 kJ/mol. The gas diffusion in the crucible and sample layer, the surface reaction and the defect diffusion of copper cations all have an impact on the conversion process of copper oxidation samples. Using the high diameter-height ratio crucible in our self-made TGA could effectively eliminate the gas diffusion in the crucible and reduce the error of the kinetic tests. Based on the previous four-step oxidation mechanism, the kinetic parameters of copper oxidation are identified using a grain-scale kinetic model, coupling with a defect transport model. The potential kinetic impact factors including the particle polydispersity, gas diffusion, defect diffusion, surface reaction and particle sintering are adequately considered in this work. First, it is found that the copper oxidation is not dominated by the defect diffusion in the solid product layer, but governed by the surface reaction in the gas–solid interface. The copper oxidation is likely to be adsorption-limited during the surface reaction in the gas–solid interface, and the intrinsic activation energy is identified as 48.0 kJ/mol. The particle-scale model is then performed to investigate the impact of physical properties of oxygen carrier particles. It can significantly accelerate the conversion rate of copper oxidation by means of decreasing the particle size and increasing the porosity. However, it is not advisable to decrease the grain size too much when preparing the oxygen carriers, for this will only increase diffusion resistance inside the particle for small grain. Finally, it can be found that in most conditions of the air reactor, Cu-based oxygen carrier with the grain size of 220–300 nm exhibits the best oxidation performance.
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Journal of the American Chemical Society
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2022
·
IF 16.383
Ling Luo,Linan Wang,Jianbang Chen,Jiazheng Zhou,Zhihua Yang,Shilie Pan,Junjie Li
Large second-harmonic generation (SHG) response and broad band gap are two important and competitive parameters. It is difficult to balance them out in one material. In this work, by coupling alkali earth metal (AEM) octahedra with large highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap and nonlinear optical (NLO)-active tetrahedra units, nine noncentrosymmetric (NCS) compounds, belonging to a new quaternary chalcogenide family AIB3IIC3IIIQ8VI with unique windmill-like [Mg3M3IIIQ24] (MIII = Al, Ga; Q = S, Se) units constructed by alternated [MgQ6] octahedra and [MIIIQ4] tetrahedra, are rationally designed and fabricated. The compounds show a stable structural framework but adjustable optical properties. Among them, NaMg3Ga3Se8 shows a large SHG response (∼1 × AgGaS2 (AGS)), wide band gap (in selenide) (2.77 eV), high laser-induced damage threshold (LIDT) (∼2.3 × AGS), and suitable birefringence (0.079@546 nm). It should be a potential candidate for infrared (IR) nonlinear optical (NLO) materials. The results enrich the chemical diversity of chalcogenides and open an avenue for the development of new IR NLO materials through the octahedra and tetrahedra coupled strategy.
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PubMed
高影响因子
Water
·
2022
·Vol. 14
·期 21
·3450
·
IF 3.53
Wei Zhou,Yu Li,Min Zhang,Guang-Guo Ying,Yong Feng
In this study, chalcopyrite (CuFeS2), a natural mineral with a bimetallic structure, was used as the activator to generate radicals for removing organic pollutants from aqueous solutions via the activation of peroxymonosulfate (PMS). Sulfisoxazole (SIX), a sulfonamide antibiotic, was selected as the model pollutant. The results showed that chalcopyrite was highly reactive toward the activation of PMS; under the conditions of 50 µM PMS and 1 g/L chalcopyrite, approximately 95.7% of the SIX was degraded after reaction for only 5 min. An increase in the loading of chalcopyrite (0.25–2 g/L) promoted the degradation of SIX, while elevated levels of PMS (0.05–0.5 mM) slightly retarded the degradation kinetics. Although the best performance was observed under acidic conditions (pHs 3 and 4), near complete degradation of SIX was also achieved at pH 5.5. Identification of reactive species revealed that both a hydroxyl radical and a sulfate radical were formed in chalcopyrite–PMS oxidation, and they were responsible for the degradation of SIX. Trace amounts of copper and iron were leached out from chalcopyrite during the activation, and both the heterogeneous and homogeneous activation of PMS contributed to the generation of oxidizing radicals. Common water constituents including Cl−,HCO3−, and natural organic matter at their environmentally relevant levels showed a limited effect on the degradation of SIX, which suggests that chalcopyrite–PMS oxidation has high reactivity and stability in the degradation of organic pollutants and shows great practical application potential.Keywords:peroxymonosulfate;CuFeS2;sulfate radicals;sulfide mineral;water matrices
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Materials Today Energy
·
2022
·
IF 9.257
Yun Zhao,Hualin Ye,Huanyu Zhang,Dan Zhao,Limin Huang,Jim Yang Lee
Li–S batteries assembled without a lithium metal anode can significantly increase the battery specific energy and obviate the safety issue of excess Li metal in the battery. In this study we found that a black phosphorous (BP) modified cooper foil current collector could provide a beneficial anode solid-electrolyte-interface (SEI) to enable the charging and discharging of Li-metal free Li 2 S-based batteries at higher C rates. The BP modification is effective in several aspects: the lithiophilicity of BP reduces the energy barrier in Li metal deposition and stripping during battery charge and discharge. The reactions between BP and lithium polysulfides also form Li 7 PS 6 in the anode SEI layer. Since Li 7 PS 6 has a high ionic conductivity for Li + diffusion, the Li plating/stripping efficiency is improved. The synergy of the lithiophilicity of BP and a Li 7 PS 6 -rich anode interphase layer was demonstrated in Li-metal free Li 2 S batteries, where the capacity retention over 100 cycles is 64.8% at the 0.2 C rate. The findings here show that current collector modifications should attend to multiple functionalities in order to be effective for the Li-metal free Li 2 S batteries.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Huizhong Chi,Wenbiao Jin,Jianqiao Zhang,Yibin Xiu,Tao Xu
In recent years, there has been growing interest in the mechanism (radical or nonradical) of persulfate activation processes. In this study, the enhancement of naproxen (NPX) degradation in a Cu 0 /peroxymonosulfate (PMS) system by complexing reagents was investigated. Surprisingly, neocuproine (NCP) alters the nature of reactive species in the Cu 0 /PMS system. A high-valent copper species, Cu(III)-NCP, was found to dominate NPX degradation rather than radicals under acid conditions for the first time. Moreover, systematically designed experiments revealed that the Cu(III)-NCP complex was a strong selective oxidant that reacted with organics through a single electron transfer pathway. Meanwhile, the degradation efficiency of NPX was highly dependent on the solution pH and dosage of Cu 0 and NCP, but was irrelevant to the concentration of NPX. Additionally, the enhancement of NCP on other copper based PMS activation systems (i.e., Cu 2+ /HA/PMS and Cu 0 /HA/PMS systems) was investigated. Considering that the released copper can be removed by a simple precipitation method to meet the effluent standards, the new complex-enhanced Cu 0 /PMS system provided a new method to enhance the degradation efficiencies of pollutants by a copper-catalyzed Fenton-like system.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bareera Raza,Yang Zhang,Ming Xu,Jun Yang,Yanna NuLi,Jiulin Wang
Rechargeable Zinc batteries as energy storage and conversion devices are attracting wide attention due to their merits of intrinsic safety, abundant resources, and inexpensive components. However, the thermodynamic instability of Zn metal anode in the aqueous environment leads to limited cycle life, poor rechargeability, and restricted large-scale employment of Zinc batteries. Herein, we investigate the electrochemical and morphological behavior of Zn anode in an organic aprotic amide, N’N -dimethylacetamide (DMAC) solvent-based electrolyte, which demonstrates highly reversible Zn deposition (CE of ∼ 99.80%), improved anodic stability (∼2.4 V vs. Zn/Zn 2+ ), and a high current capability of 15.0 mA cm −2 /15.0 mAh cm −2 . Practically, a remarkable performance with high-capacity retention and high CE (≥99%) is attained for Zn||MnO 2 full cell, which is a positive step toward the development of rechargeable Zinc batteries.
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