CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Runjia Liu,Dan Xu,Yan Liu,Liang Wu,Qiwen Yong,Zhi-Hui Xie
The inherent micropores of micro-arc oxidation (MAO) coatings on magnesium alloy often cause poor long-term corrosion resistance . Herein, a low-porosity and high corrosion-resistant 8HQ/LDH/MAO composite coating , comprising a layered double hydroxide (LDH)-doped MAO primer and a top layer of 8-hydroxyquinoline (8HQ) inhibitor film, was deposited onto the magnesium alloy surface. Characterizations such as high-resolution field-emission transmission electron microscopy were performed to observe the synthesized nanoparticles’ morphology, size, composition, and structure. Results confirmed the successful synthesis of nitrate ion intercalated MgAl-LDH nanosheets and demonstrated the increase in thickness and denseness of the MAO coating after LDH doping. Based on electrochemical impedance spectroscopy and Tafel curves, the corrosion current density ( j corr ) of the newly fabricated 8HQ/LDH/MAO composite coating was reduced by about three orders of magnitude. The low-frequency impedance modulus (| Z | ƒ=0.1 Hz ) increased by nearly four orders of magnitude compared with that of bare Mg alloy. After 14 days of exposure to the corrosive electrolyte, the composite coating maintained a low j corr , showing significantly enhanced corrosion resistance compared with single MAO coating. These findings demonstrated the synergism of LDH doping with 8HQ sealing to enhance the corrosion protection of MAO coating on magnesium alloy.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qing Xin,Siqi Liu,Shixu Lu,Zhenyu Chen,Pengzhan Han,Shuaishuai Xin,Qianwen Wang,Guocheng Liu,Chengzhi Zhou,Yanjun Xin,Qinghua Yan
In this study, a fast and efficient Cu 2 Fe 0.5 Al 0.5 -LDH/PMS water purification system was constructed to degrade sulfamethoxazole (SMX). The optimized Cu 2 Fe 0.5 Al 0.5 -LDH/PMS reaction system degraded 50% SMX for only 0.5 min, and 98.25% SMX for 10 min. The advanced characterization techniques proved that the abundant hydroxyl groups of Cu 2 Fe 0.5 Al 0.5 -LDH can form ≡M−(O)OSO 3 − complexes with PMS, resulting in reactive oxygen species (ROS) and promoting SMX degradation. Moreover, the electron transfer between the active bimetallic components played a synergistic role in the generation of ROS species. Compared with the electron transfer degradation mechanism, ROS mechanism contributed more to SMX degradation, in which surface-bound SO 4 − was the dominated active species. The possible degradation pathway and intermediate toxicity of SMX were proposed. This work provided a strategy to fully explore the catalytic degradation mechanism of heterogeneous catalysts in wastewater purification.
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SURFACE & COATINGS TECHNOLOGY
·
2023
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IF 5.4
Xiao Jia,Yingying Wang,Junlei Tang,Kaikai Song,Hailong Zhang,Bing Lin,Hongpeng Zheng
Water electrolysis is a promising sustainable technology for hydrogen production . To achieve large-scale commercialization, electrocatalysts must meet specific performance requirements, such as low cost, high durability, and the ability for high-yield and high-quality production on a macroscopic scale. This study focuses on the preparation of self-supported electrodes for water splitting using stainless steel (SS) as the conductive carrier of the catalytic electrode. In alkaline conditions, FeNi-LDH@Ni films were grown on the surface of stainless steel, resulting in efficient and stable electrodes (FeNi-LDH@Ni/SS). The electrodes exhibited low overpotentials of 399 mV and 212 mV for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively, to reach a current density of 10 mA cm −2 . Amplified electrodes with a surface area of 1 dm 2 were tested in an industrial environment of 6 M KOH at 60 °C. The two-electrode alkaline water electrolyzers (AWE) composed of the two FeNi-LDH@Ni/SS electrodes demonstrated excellent stability for 100 h and required only 1.744 V to reach a current density of 10 mA cm −2 . This study provides insight into the development of stable, efficient, and low-cost electrodes for industrial water splitting applications.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Jiangfu Zheng,Changzheng Fan,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Shuaijun Pan,Baowei Zhang,Jinglin Ding,Junwu Liu
A stable, efficient and pollution-free treatment system should be urgently developed to boost the application of green and sustainable photocatalytic materials in practical wastewater composite remediation. two-dimensional (2D) red phosphorus (RP)/ZnAl-LDH (Layered Double Hyroxides) photocatalyst photocatalysts were developed in this study. The optimized RPLDH0.8 (RP/ZnAl-LDH0.8)/Vis system was found with a high tetracycline hydrochloride (TC) degradation rate of 89% in 90 min. Moreover, the total organic carbon (TOC) removal rate was obtained as 21%. As indicated by the results of the experiments and characterization, the fast catalytic process arose from the S-scheme charge transfer pathway in RP/ZnAl-LDH. Furthermore, the liquid chromatography-mass spectrometry (LC-MS) and the radical capture assays were performed to investigate the probable TC photodegradation pathway and the primary reactive radicals in the photocatalytic process. The results of the bio-acute toxicity-based assays suggested that the RPLDH0.8/Vis system detoxified the transformation products . Lastly, the above RPLDH0.8/Vis system was found with high removal rates for other organic pollutants while showing high removal performance in different natural water bodies. Besides, the leaching concentration of total Zn in each of the five cycles of the degradation experiments was significantly lower than the national level discharge standard, suggesting that the RPLDH0.8/Vis system degraded TC without secondary heavy metal contamination. As revealed by the above findings, a novel strategy was proposed to prepare RP/ZnAl-LDH photocatalysts for the photocatalytic degradation of antibiotics.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 17
·9546-9554
·
IF 11.9
Dongyan Gao,Renning Liu,Dandan Han,Pengcheng Xu,Ping Wang,Yen Wei
Engineering hierarchical heterostructure materials has been recognised as a challenging but prepossessing strategy for developing hybrid supercapacitors. Thus, a Ni–Co PBA derived 3D/1D heterostructure NiO/NiCo2O4 based layered double hydroxide on carbon cloth (CC/NiO/NiCo2O4/NiMn-LDH) as a battery-type electrode was successfully designed via a controllable hydrothermal method. The 3D Ni–Co PBA nanocubes served as scaffolds, providing more space for the nickel-cobalt precursors to grow and then calcine to form a continuous conductive layer of 3D/1D CC/NiO/NiCo2O4. Subsequently, 2D ultrathin NiMn-LDH nanosheets were uniformly anchored on 3D/1D NiO/NiCo2O4, resulting in a unique hierarchical structure that effectively addressed the restacking issue and dead volume of NiMn-LDH, contributing to increased charge and electron transport rates, which promoted the reaction kinetics. Benefiting from abundant interfaces with the open channels of the nanoarchitecture, the CC/NiO/NiCo2O4/NiMn-LDH electrode showed an exceptional specific capacity of 1593.0 C g−1 at 1 A g−1 and a desirable rate performance of 92.9% at a current density of 8 A g−1. Surprisingly, HSC devices can achieve an ideal specific energy of 44.28 W h kg−1 at a specific power of 108.22 W kg−1 with 97.59% cycling durability after 10 000 consecutive charge/discharge cycles. These remarkable properties indicate that the designed novel hierarchical heterostructure electrode has great potential for broad applications in electrochemical energy storage systems.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
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IF 3.834
Jiuyun Cui,Qianqian Wang,Atian Xie,Jihui Lang,Zhiping Zhou,Yongsheng Yan
The development of superhydrophilic/underwater superoleophobic membrane is significant for purification of emulsified oily wastewater. However, low flux and membrane fouling still remains a challenge. Herein, a sisal-like structured hybrid membrane is prepared through in situ growth of nickel cobalt layered double hydroxide (NiCo-LDH) microcrystals on membrane surface for oil/water emulsion separation. The as-prepared hybrid membrane (CN@pDA@PVDF) exhibits low oil adhesion, outstanding antifouling performance and superhydrophilicity/underwater superoleophobicity. Under gravity driven, the separation experimental results demonstrate the as-prepared membrane can effective separate surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE) with separation efficiency of above 99.4%. Furthermore, with a simple and low cost approach, as well as the significantly enhanced performance, the as-prepared hybrid membrane has bright application prospective in wastewater treatment.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-13
·
IF 5.3
Zhong Yu,Liao Ran,He Guowen,Liu Saiwen,Zhang Jin,Chen Chao
Cubic hollow-structured NiCo-LDH was synthesized using a solvothermal method. Subsequently, clay-like Ti 3 C 2 T x MXenes were electrostatically self-assembled with NiCo layered double hydroxides (NiCo-LDH) to form composites featuring three-dimensional porous heterostructures. The composites were characterized using SEM, TEM, XRD, XPS, and FT-IR spectroscopy. Ti 3 C 2 T x MXenes exhibit excellent electrical conductivity and hydrophilicity, providing abundant binding sites for NiCo-LDH, thereby promoting an increase in ion diffusion channels. The formation of three-dimensional porous heterostructural composites enhances charge transport, significantly improving sensor sensitivity and response speed. Consequently, the sensor demonstrates excellent electrochemical detection capability for quercetin (Qu), with a detection range of 0.1–20 µM and a detection limit of 23 nM. Additionally, it has been applied to the detection of Qu in natural plants such as onion, golden cypress, and chrysanthemum. The recovery ranged from 97.6 to 102.28%. Graphical Abstract
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
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IF 9
Jiahui Zhang,Hongyi Zhang,Zhen Chen,Zhenghua Zhang
Pervasive exposure to different micropollutants (e.g. endocrine disrupting chemicals and pharmaceuticals) present in water environments, presents a notable risk to public health. Herein, three Co-based bimetallic layered double hydroxides (LDHs) were fabricated, then assembled into LDH-based nanoconfined catalytic membranes (CoM m , M: Fe, Mn, and Cu) with similar structural and physicochemical properties. The micropollutant removal performance of CoM m in the presence of peroxymonosulfate (PMS) was ranked in the order: CoMn m > CoFe m > CoCu m . The CoMn m achieved a 100% removal efficiency for pharmaceuticals and endocrine disrupting chemicals, achieving a first-order rate constant (1.64 ms −1 for ranitidine) that was 10 2 –10 6 higher than traditional LDH catalysts. Density functional theory (DFT) results revealed that CoMn m possessed the highest adsorption energy with PMS and d-band centre, exhibiting superior chemisorption activity and faster charge transfer than the other prepared membranes. Furthermore, the nanoconfinement effect within membrane nanochannels contributed to the outstanding performance of CoMn m . This study provides an atomic-scale understanding of the catalytic mechanisms of CoM m , guiding the design and optimization of catalytic membranes for water purification.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Sen Qiao,Chaoming Rao,Haiyan Chen,Min Xiong,Qiuhua Xu,Suqin Ci
The construction of crystalline-amorphous coupling structure is one of the effective strategies to enhance the performance of oxygen evolution reaction (OER) and urea oxidation reaction (UOR). Herein, NiFe-LDH/NiMoO 4 /NF with high oxygen evolution and urea oxidation performance was successfully prepared by electrodeposition of amorphous substances on the crystalline precursor of hydrothermal synthesis. Remarkably, the NiFe-LDH/NiMoO 4 /NF displays exceptional electrocatalytic performance for OER and UOR, with a potential of only 1.57 V vs. RHE at 100 mA cm −2 and the Tafel slope of 54.4 mV dec −1 for OER, high UOR activity with a potential of 1.45 mV@100 mA cm −2 and the Tafel slope of 20.4 mV dec −1 in 1.0 M KOH with 0.33 M urea solution. In a hybrid acid-base electrolysis system for urea oxidation-assisted H 2 production using NiFe-LDH/NiMoO 4 /NF as the anode electrode and Pt/C/NF as the cathode electrode, the process requires a cell voltage of only 0.55 V vs . RHE at 10 mA cm −2 . Moreover, this hybrid acid/base system demonstrates stable operation for 110 h with minimal attenuation at a current density of 100 mA cm −2 . These results indicate a facile strategy for the design of electrodes with crystalline-amorphous coupling structures for energy conversion.
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Surfaces and Interfaces
·
2024
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IF 5.7
Gengzhe Shen,Lin Xu,Jing Kong,Chi Tat Kwok,Jingle Wang,Liuyan Zhang,Xiaohua Jie,Zhipeng Sun,De Ning,Zhengjian Chen
In this study, a new Al-LPM composite coating was in-situ deposited on the Al alloy via a facile one-pot hydrothermal method . Morphological and compositional characterizations revealed a tri-layered structure of the Al-LPM coating, namely, zinc aluminum-layered double hydroxide (ZnAl-LDH)/poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS)/MoS 2 . ZnAL-LDH was deposited closest to the surface of Al alloy , and the metallic ion-cross-linking of PEDOT:PSS makes the 3D coating more robust. The unique structure endows the coating with superior protective properties against both corrosion and wear. For anti-corrosion, the Al-LPM coating showed very high self-corrosion potential (-0.092 V) and small self-corrosion current density (46.0 μA cm −2 ) (vs. Al substrate with -1.157 V and 354.8 μA cm −2 , respectively), long-lasting high corrosion resistance (>57,000 Ω cm 2 ) during the immersion test, and the almost intact surface morphology and composition after 360 h corrosion. For anti-wear, the friction coefficient of the Al-LPM coating was determined to be < 0.2, which was much smaller than for the Al substrate (> 0.4). Also, there were no serious wear marks and grooves left after the dry-friction test.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Silong Wang,Zhihua Sun,Yuhao Wang,Taixin Liang,Baoguo Wang,Chunfang Fan,Yanjun Chen,Changcheng Liu,Que Huang
CuS-based composites are widely used in the fields related to photothermal energy storage and electromagnetic shielding and are excellent candidates for composites with phase change materials. To meet the requirements of micro-integration and electromagnetic resistance of electronic products and optimize the thermal management of electronic products, it is necessary to prepare new flexible composite phase change materials. In this paper, through the design of MPC@Ni Al-LDH/CuS double-layer structure, two-step vacuum filtration method is used, and the highly conductive materials CuS and MPC are introduced into the manufacture of PCM films. With the help of Ni Al-LDH, flame retardancy is introduced. The electromagnetic wave absorption performance is enhanced, and the existence of nano-cellulose (CNF) makes the film have excellent mechanical properties. Ni Al-LDH/MPC and CuS substrates with stable and high mechanical properties are prepared by ultrasonic treatment. According to scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC) and thermogravimetry (TG) characterizations, PEG successfully entered the MPC/CuS skeleton by vacuum filtration, and flexible phase change composite bilayers (MLPC) were obtained. Due to the synergistic effect of structure and components, the obtained composite film has many different excellent functions. Specifically, when MPC@Ni Al-LDH is 15 wt%, the phase transition enthalpy, thermal conductivity, electromagnetic shielding, and electrical conductivity are 146.8 J/g, 1.07 W/m·K, 38.8 dB and 126.4 S/m, respectively. The 3600 s infrared temperature measurement results show that the sample has stable thermal properties. Due to the presence of CuS, when MPC@Ni Al-LDH is 5 wt%, its absorbance can be kept at 1.51 L/(g·cm), and its photothermal conversion efficiency can reach 90.6 %. The MPC/CuS structure in the composite film provides many heat transfer channels, which reduces the phonon scattering in the heat transfer process and significantly increases thermal conductivity. Therefore, this multifunctional flexible phase change film can be used in photothermal conversion devices and for thermal management of electronic equipment, and it has broad application prospects in wearable equipment design due to its excellent electromagnetic shielding ability and infrared thermal stealth ability.
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Journal of Energy Storage
·
2024
·
IF 8.9
P.S. Dighe,R.S. Redekar,N.L. Tarwal,P.B. Sarawade
Because of the high energy demand, hybrid supercapacitors (HSC) are one of the best options in energy storage systems. The energy demand can be fulfilled by achieving superior energy density . Recently, layered double hydroxides (LDHs) have been favoured as magnificent supercapacitive electrode materials due to their capability of storing high energy density using their tuneable layered structure. In this study, we have synthesized nickel‑cobalt layered double hydroxide on nickel foam (Ni-Co LDH/NF) by utilizing a low-cost hydrothermal technique to obtain high energy density. To monitor the effect of the morphological aspects on electrochemical performance, reaction time during synthesis was varied. The structural and compositional studies confirmed Ni-Co LDH deposition on the Ni-foam. The morphological analysis showed highly interconnected nanosheets which efficiently provided fast transport pathways for electrons and electrolyte ions. The Ni-Co LDH/NF film synthesized at 6 h delivered a distinguished rate capability with a specific capacitance of 1577 F/g at 1 mA/cm 2 . Notably, a fabricated aqueous asymmetric supercapacitor showed a good energy density of 38 Wh/kg. These results highlighted the remarkable advantages of the binder-less nanosheet structure of the Ni-Co LDH for potential use in the supercapacitor application.
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