APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 3
·1-9
·
IF 1.81
Ding Feng,Lin Jing,Wu Tengyan,Zhong Hongbin
Magnetic nanoparticles were one of the most promising materials for targeted magnetic hyperthermia application due to the excellent magnetic properties. In this work, the magnetic nanoferrite of Mn 0.6 Zn 0.4 La x Fe 2− x O 4 ( x = 0.09, 0.1, 0.15, 0.2, 0.25 and 0.3) was synthesized by the hydrothermal method. Various physical properties of samples have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy and vibrating sample magnetometer. XRD results revealed that the lattice constants a t and crystallite size of the Mn–Zn nanoferrites decreased with increasing La 3+ content. The characteristic absorption bands of spinel nanoferrites and polyethylene glycol were observed in the FTIR spectra. FTIR results indicated that polyethylene glycol was coated on the Mn–Zn nanoferrites successfully. The saturation magnetization ( M S ), magnetic moment ( M r ) and anisotropy constant ( K ) were affected by La 3+ ion content. The M S of Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 was 58 emu/g, which could be potential hyperthermia in biomedical application.
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Science China-Technological Sciences
·
2020
·Vol. 63
·期 9
·1730-1738
·
IF 2.302
Xu LingSong,Meng FanCheng,Wei XiangFeng,Lin ChangHao,Zheng LianXi,Liu JieHua
ZIF-derived carbon structures are considered as desired electrode materials for supercapacitors due to their high surface area, high conductivity, and porous structure. However, the most reported ratio of 2-methylimidazole and Zn(II) is 4:1 to 20:1, which limits commercial applications due to the increasing cost. In this paper, a multirole Zn(II)-assisted method is presented from Zn(II) solution, ZnO, ZnO/ZIF-8 core-shell nanostructure, to 3D hierarchical micro-meso-macroporous carbon structures with a 1:1 ratio of 2-methylimidazole and Zn(II). The hierarchically porous carbon has a high surface area of 1800 m 2 g −1 due to the synergistic effect of multirole Zn(II). The unique carbon-based half-cell delivers the specific capacitances of 377 and 221 F g −1 at the current densities of 1.0 and 50 A g −1 , respectively. As a 2.5 V symmetrical supercapacitor, the device reveals a high double-layer capacitance of 24.4 F g −1 , a power density of 62.5 kW kg −1 , and more than 85.8% capacitance can be retained over 10000 cycles at 10 A g −1 . More importantly, the low-cost hierarchically porous carbon could be easily produced on a large scale and almost all chemicals can be reused in the sustainable method.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Kewen Ding,Yuchen Wu,Xiaofeng Wei,Xuewei Zhu
This study aims to fabricate chromium-free Zn–Al + CeO 2 composite coatings by integrating CeO 2 nanoparticles into the chromium-free Zn–Al coating solution as a strengthening agent and subsequently applying a wet coating method. The corrosion resistance of the coatings was evaluated through NaCl immersion corrosion tests . The microscopic morphology, composition and electrochemical properties of the composite coatings before and after corrosion were analyzed using SEM and an electrochemical workstation. The corrosion resistance mechanism of the coatings was investigated as well. The results revealed that the CeO 2 nanoparticles were uniformly distributed on the surface of the composite coating and in the gaps between Zn and Al powders, forming micron-sized particles due to the surface energy effect. The composite coating exhibited a minimum corrosion current density of 0.63 μA cm −2 and a maximum corrosion electrochemical reaction resistance of 35321 Ω cm 2 . Additionally, a complex precipitate formed by the reaction of certain Ce elements in the composite coating enhanced the cathodic protection of the coating. Moreover, Ce 3+ reacted with the OH − generated by microelectrochemical corrosion, resulting in the formation of a precipitate that filled in the gaps between Zn and Al powders. Consequently, this process contributed to the formation of a microporous and flocculent coating structure. In conclusion, the incorporation of CeO 2 nanoparticles had a favorable impact on the production of environmentally friendly and corrosion-resistant chromium-free Zn–Al coatings.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jia Hui Guo,Huan Liu,Yong Wang,YaNan Teng,XingWei Sun,Wei Yan Sun,Chun Ping Li,Jie Bai
The development of efficient, stable and low-cost dual-function electrocatalysts and applicated it to Zn-air batteries are very important for the development of renewable energy storage and conversion technologies. Antiperovskite catalysts have attracted much attention recently due to their advantages of adjustable structure and high element selectivity. In this work, a flexible and adjustable antiperovskite catalyst ZnCCe 3−x Ni x (0 ≤ x ≤ 3) loaded on carbon fiber (ZnCCe 3−x Ni x /CNFs) was prepared by electrospinning technology and used as an air cathode catalyst for rechargeable Zn-air batteries. By doping the X-site with highly conductive transition metal Ni, the electronic structure of the catalyst ZnCCe 3−x Ni x /CNFs was optimized, and the catalytic activity of the antiperovskite bimetallic X-site was tuned to achieve an efficient and synergistic catalytic reaction. Among them, ZnCCe 2.7 Ni 0.3 /CNFs showed excellent OER/ORR bi-functional catalytic activity (Δ E = 0.82 V) and good stability. When ZnCCe 2.7 Ni 0.3 /CNFs is used as the cathode catalyst for rechargeable Zn-air batteries, it shows a power density of 117.99 mW cm −2 , and the cycle stability can be maintained for up to 300 h, indicating its application potential in the field of Zn-air batteries.
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ACS Nano
·
2023
·
IF 17.1
Liyang Liu,Haiying Lu,Chao Han,Xianfei Chen,Sucheng Liu,Jiakui Zhang,Xianghong Chen,Xinyi Wang,Rui Wang,Jiantie Xu,Hua Kun Liu,Shi Xue Dou,Weijie Li
One effective solution to inhibit side reactions and Zn dendrite growth in aqueous Zn-ion batteries is to add a cosolvent into the Zn(CF3SO3)2 electrolyte, which has the potential to form a robust solid electrolyte interface composed of ZnF2 and ZnS. Nevertheless, there is still a lack of discussion on a convenient selection method for cosolvents, which can directly reflect the interactions between solvent and solute to rationally design the electrolyte solvation structure. Herein, logP, where P is the octanol–water partition coefficient, a general parameter to describe the hydrophilicity and lipophilicity of chemicals, is proposed as a standard for selecting cosolvents for Zn(CF3SO3)2 electrolyte, which is demonstrated by testing seven different types of solvents. The solvent with a logP value similar to that of the salt anion CF3SO3– can interact with CF3SO3–, Zn2+, and H2O, leading to a reconstruction of the electrolyte solvation structure. To prove the concept, methyl acetate (MA) is demonstrated as an example due to its similar logP value to that of CF3SO3–. Both the experimental and theoretical results illustrate that MA molecules not only enter into the solvation shell of CF3SO3– but also coordinate with Zn2+ or H2O, forming an MA and CF3SO3– involved core–shell solvation structure. The special solvation structure reduces H2O activity and contributes to forming an anion-induced ZnCO3–ZnF2-rich solid electrolyte interface. As a result, the Zn||Zn cell and Zn||NaV3O8·1.5H2O cell with MA-involved electrolyte exhibit superior performances to that with the MA-free electrolyte. This work provides an insight into electrolyte design via salt anion chemistry for high-performance Zn batteries.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jingjing Fang,Junjie Qian,Wen Shi,Huaqian Mou,Xiujuan Chen,Gaoxiang Zhang,Zanfang Jin,Feili Li
The bioaccumulation of heavy metals (HMs) at the water-algal interface determines their threat degree to aquatic ecosystem . Amino acids (AAs), as predominant components of dissolved organic matter (DOM), play pivotal roles in shaping the speciation of HMs in water and their subsequent accumulation by algae. However, the diverse nature of amino acid poses a challenge in generalizing the underlying mechanisms. This study explores four amino acids (asparagine, aspartic acid , glycine, lysine), each possessing distinct amino and carboxyl groups , and investigates their impact on zinc (Zn) bioaccumulation through batch experiments. Upon the introduction of AAs, the adsorption process obeyed the pseudo-second-order kinetic adsorption model demonstrating chemisorption (R 2 >0.99), and it affected Zn externalization (up to 3.994 mmol g - 1 ). This phenomenon followed a two-step model, indicating multilayer adsorption. The study proposed that the protonated amino group of AA could serve as a link between Zn-AA complex and microalgae. Amino acids adsorbed onto the surface of microalgae via protonated amino groups did not occupy the Zn-binding sites, instead, they furnished additional functional groups. This differs from the previous results of organic acids containing only carboxyl functional groups as DOM. Multiple linear regression equations and correlation analyses were used to explain the effects of amino and carboxyl morphology on microalgae accumulation of Zn. The equation showed that the leading model terms explain 75.8% of the accumulation amount variance. This study enhances our understanding of the effects of functional group-different DOM on the accumulation of heavy metals in microalgae, offering insights for future research and prediction.
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Energy Storage Materials
·
2023
·
IF 20.4
Zhenye Liang,Chao Li,Daxian Zuo,Lin Zeng,Tong Ling,Jiajia Han,Jiayu Wan
Rechargeable aqueous Zn batteries (RAZBs) are promising for energy storage systems as they are intrinsically safe, cost-effective and environmentally friendly. However, undesired dendrites and corrosion side reactions worsen at cycling, which limit the reversibility and scalable application of RAZBs. This issue arises from the undesired side reactions from corrosion of Zn in regular aqueous electrolytes, which lead to formation of side products, nonuniform Zn nucleation, finally dendrite formation. Here, we report nitrilotriacetic acid (NTA) as a highly efficient functional additive that can preferentially adsorbs on Zn surface, avoiding the direct contact between Zn and water molecules and significantly alleviating corrosion. This clean, protected Zn surface can thus promote uniform Zn plating/stripping. Furthermore, the adsorbed NTA molecules can attract water molecules to facilitate the desolvation of Zn 2+ and promote Zn 2+ fast transport, as verified both experimentally and computationally. Notably, we found that only a trace amount of NTA (0.15 wt%) is sufficient to form a stable electrode/electrolyte interface, reducing the corrosion rate from 3.63 mA cm −2 to merely 0.22 mA cm −2 . This stable interface enabled highly reversible Zn stripping/plating at 5 mA cm −2 and 0.5 mAh cm −2 in symmetric cells, lasting about 2100 h. An outstanding average Coulombic efficiency of 99.40 % in 800 cycles was also achieved. This study provides new insights into realizing highly reversible Zn anodes for RAZBs via the addition of highly efficient, multifunctional electrolyte additive , whose design principle may be generalized to many rechargeable battery systems.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Zesen Gao,Shaowei Wang,Futing Sun,Zhiqian Yu,Hucheng Song,Zhanqiang Liu,Haijie Chen
Halides have currently been discovered to be ideal electrolytes for all-solid-state Li batteries (ASSLBs) due to their variability, splendid electrochemical stability, and high Li + conductivities. Here, we studied the electrochemical properties of Li 2-2 x Zn x MgCl 4 ( x = 0–0.3) and their application in ASSLBs. By Zn substitution into the Li site of Li 2 MgCl 4 , the Li + conductivities of Li 1.6 Zn 0.2 MgCl 4 (1.2 × 10 −5 S/cm) at room temperature is two orders higher than that of Li 2 MgCl 4 (1.9 × 10 −7 S/cm). The activation energy is reduced to 0.28 eV for Li 1.6 Zn 0.2 MgCl 4 (Li 2 MgCl 4 is 0.47 eV). We attributed the enhanced electrochemical performance to Li vacancies generated from the Zn substitution. In addition, we fabricated a Li | Li 1.6 Zn 0.2 MgCl 4 | Li cell to appraise the electrochemical performance in the lithiation and stripping. It is demonstrated that Li 1.6 Zn 0.2 MgCl 4 can cycle for 100 h under a current density of 0.07 mA/cm 2 . This study demonstrates that introducing Li vacancy into Li 2 MgCl 4 may be a valid way to promote the electrochemical properties of the halides.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xukai Li,Weirui Chen,Dongpo Liu,Gaozu Liao,Jing Wang,Yiming Tang,Laisheng Li
Due to its low interfacial electron migration ability and highly hydrophilic, Fe-MCM-41 (FeM) had poor activity and stability during catalytic ozonation . To this end, the secondary metal Zn and Si-F group were introduced into the framework of FeM to create surface potential difference and hydrophobic sites. Comparative characterizations showed that there existed rich acid sites with great potential difference on F-Fe-Zn-MCM-41 (FFeZnM). Additionally, because of the existence of hydrophobic and electron-withdrawing Si-F unit, the electron migration ability, hydrophobicity and acidity of FFeZnM were enhanced. The greater O 3 mass transfer was induced by Si-F group and O 3 was directly activated at Fe and Zn Lewis acid sites into •OH, •O 2 - and 1 O 2 . With •OH acting as main species, FFeZnM/O 3 achieved the superior IBP removal (93.4%, 30 min) and TOC removal (46.6%, 120 min) over those of sole O 3 and F-FeM/O 3 processes, respectively. HCO 3 - , Cl - , NO 3 - and SO 4 2- hindered IBP degradation by FFeZnM/O 3 , but high concentration humic acid (HA) exhibited promotion by forming HA-IBP complex. IBP degradation by FFeZnM/O 3 was enhanced with tap water , river water, and effluent from the secondary sedimentation tank of the sewage plant acting as medium. This study proposed an innovative approach to catalyst design for catalytic ozonation.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yinghong Zhu,Guanxuan Guo,Jianping Zhang,Qi Zhang,Ke Chen,Minling Zhou,Youqun Chu
Copper nanoparticles (Cu NPs) modified zinc electrode (Cu-Zn/Cu-foam) is successfully prepared via cathodic electrodeposition followed by a galvanic-exchange procedure and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), Tafel curve and galvanostatic electrolysis. With the reconstruction of Zn through the formation of Cu NPs on the surface, the corrosion current and active surface area are increased, and the activity on the electrochemical reduction of tetrabromobisphenol A (TBBPA) is activated. The TBBPA (10 mmol/L) is almost degraded within 1 h, and the yield of the complete debromination product bisphenol A (BPA) reaches 92 % in 3 h. Furthermore, the surface of used Cu-Zn/Cu-foam electrode become more uniform and CuZn 5 is formed, which enabled the stable electro-catalytic activity on the electro-reduction of TBBPA even after ten cycles. Then the degradation mechanism is proposed. The micro galvanic reconstruction of Zn offers a promising strategy for the removal of TBBPA in aquatic environment.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3232-3236
·
IF 1.093
Peng Mingyue,Ci Suqin,Shao Ping,Cai Pingwei,Wen Zhenhai
Exploiting effective electrocatalysts toward electrochemical conversion of CO2 into valued-added chemicals is highly desirable for achieving the global carbon cycle. In this work, we report the synthesis of Cu3P/C nanocomposites by phosphatizing the copper-based
metal organic framework precursor. Systematic electrochemical characterizations demonstrate the Cu3P/C nanocomposites hold high activity and favorable selectivity towards CO2 reduction reaction (CO2RR) into CO, as manifested by an onset potential is about −0.25
V versus reversible hydrogen electrode (RHE) and a faradic efficiency (FE) of 47% for CO production at a relatively low potential (−0.3 V). The attractive catalytic properties might be attributed to the synergistic effect of cooper and phosphorus elements, as well as the unique structure
of Cu3P. Furthermore, we propose an asymmetrical-electrolyte Zn–CO2 battery with the Cu3P/C as cathode catalyst, demonstrating a decent performance with an open-circuit voltage of 1.5 V and a power density of 2.6 mW cm−2 (at 10 mA cm−2).
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Arabian Journal of Chemistry
·
2018
·
IF 2.969
Shuai Zhang,Shoulian Wei,Hao Cheng,Wei Li
Nano-scaled Fe 3 O 4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe 3 O 4 was conducted with APTES. With Fe 3 O 4 -NH 2 and Zn 2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC) 2 @Fe 3 O 4 ) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC) 2 was almost an octahedron, and the Zn-(PDC) 2 @Fe 3 O 4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC) 2 @Fe 3 O 4 were studied with H 2 O 2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H 2 O 2 by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.411 mM, the maximum reaction rate: v max = 3.440 × 10 −8 M s −1 ; the Michaelis constant of TMB by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.189 mM, and the maximum reaction rate: v max = 2.419 × 10 −8 M s −1 , both of which were lower than those of H 2 O 2 and TMB by Fe 3 O 4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H 2 O 2 in oxidation-reduction reaction between SO 3 2− and H 2 O 2 under acid conditions, a new method for determining the content of SO 3 2− was established. The linear range of SO 3 2− was 8 × 10 −7 ∼8 × 10 −5 mol/L, the detection limit of SO 3 2− was 8 × 10 −8 mol/L, and the RSD of SO 3 2− was 2.7–9.2%.
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