RARE METALS
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2024
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IF 9.6
Li Jia-Hong,Chen Hao,You Si-Hang,Yang Gan-Xin,Liu Peng,Gao Meng-Qi,Chen Shu-Guang,Zhang Fei-Fei
Owing to the significant potential of alkaline seawater electrolysis for converting surplus power into eco-friendly hydrogen fuel, we developed bifunctional electrodes that integrate low-crystalline NiFe LDHs and amorphous NiFe alloy on a Ni foam (NF) substrate to enhance this process. Driven by the battery-like characteristics of NiFe LDHs, an anti-corrosive and active outer layer of NiFe vac OOH continuously forms over time in the hybrid on the anode for the oxygen evolution reaction (OER), effectively mitigating powder shedding caused by corrosion induced by multiple anions in seawater. Meanwhile, the strong bond between the hybrid and the NF substrate maintains intact hybrid coatings to ensure a relatively high overall conductivity of the electrodes, significantly reducing the negative effects of structural degradation during the OER and hydrogen evolution reaction (HER), as well as the accumulation of contaminants on the electrode surfaces. In long-term tests, these bifunctional hybrid electrodes maintained stable performance, even at a high current density of 500 mA·cm −2 . The cell voltage increased by only 88 mV over 1000 h to 1.970 V during saline electrolysis and by 103 mV over 500 h to 2.062 V during seawater electrolysis. Hence, this study provides valuable insights into efficient and stable seawater electrolysis using NiFe LDHs–NiFe alloy hybrids. Graphical abstract
研究领域:
材料科学
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电化学
·
可再生能源
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Chenzhang Liu,Jia Li,Min Zuo,Dickon H.L. Ng,Xiaohan Yang,Shuo Gao,Ziwei Lan
Antibiotic residues in water are closely related to human health and environment. Therefore, it is of great significance to detect and remove antibiotics in water. Here, by integrating nanozyme activity and self-propelled movement that can promote the mass transfer and diffusion in solution, a novel dual-functional CDs-LDHs@MnO 2 /Fe 3 O 4 magnetic micromotor with high exposed active sites for the detection and removal of oxytetracycline (OTC) was prepared by a biotemplate method. The micromotor could move autonomously in aqueous solution containing H 2 O 2 , reaching a mean speed of 158.35 ± 11.64 μm/s in 5 wt% H 2 O 2 . Due to the synergy of motion and the CDs-enhanced peroxidase-like activity, the micromotor could easily detect OTC in aqueous solution with a low detection limit (0.291 μM), wide detection range (0–100 μM), high selectivity, and a high magnetic recovery rate (near 85 %). More importantly, these micromotors also enabled rapid degradation of OTC through Fenton and Fenton-like reactions, reaching 87.93 % in the presence of 5 wt% H 2 O 2 . This work could provide a new idea for detecting and removing antibiotics from water.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Li Su,Xinai Yu,Yuqi Miao,Guojiang Mao,Wenpei Dong,Suling Feng,Siman Liu,Like Yang,Kaige Zhang,Hua Zhang
Nanozymes’ activities could be regulated by a simple and effective pH change in an in situ manner. In this work, for the first time, the peroxidase-like activity of Ni/Co layered double hydroxides (LDHs) was regulated via the alkaline-promoted reaction of fluorogenic substrate homovanillic acid and H 2 O 2 , and a promising tool for pH sensing was developed over the pH range of 8.3–9.6. As peroxidase nanozyme model, Ni/Co LDHs showed ease of preparation, low-cost, and water-solubility, which played an important role in this luminescence system. Based on the pH-dependent regulation of the Ni/Co LDHs activity, we constructed the bioassay platform for the determination urea, urease, penicillin G, and penicillinase with a wide linear range of 17–1000 µM, 3.3–270 mU mL −1 , 3.3–1300 µM and 3.3–100 mU mL −1 , respectively. This study not only demonstrated the alkaline-promoted modulation the nanozymes’ activities, but also established a facile approach to develop novel bioassays.
研究领域:
生物化学
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分析化学
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生物技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shixia Chen,Yifeng Huang,Xinxin Han,Zeliang Wu,Cen Lai,Jun Wang,Qiang Deng,Zheling Zeng,Shuguang Deng
Layered double hydroxides (LDHs) are currently attracting intense research interests as pollutant adsorbent due to its low cost, non-toxicity, structure amenability and anion exchange capability. Herein, 3-dimensional (3D) flower-like Ni/Al LDH were prepared to decorate H 3 PO 4 activated biomass-derived porous carbons (PAB) via a facile and green hydrothermal method. The as-synthesized nanocomposites (Ni/Al@PAB) displayed favorable removal performance towards both Cr(VI) and methyl orange (MO) from aqueous solution due to the inherited excellent Cr(VI) removal ability from PAB and MO removal ability from Ni/Al LDH. In single-component removal system, the maximum adsorption capacity of 271.5 and 412.8 mg/g for Cr(VI) and MO were achieved on Ni/Al@PAB, respectively. Remarkably, the removal capacity of Cr(VI) and MO both increased in the Cr(VI) MO binary system due to the synergistic effect including, (i) additional adsorption sites of N-containing groups from MO, (ii) electrostatic interactions by the reduced Cr(III), and (iii) mutual thermal compensation in the binary system. This work paved the way for designing novel LDHs-decorated porous carbon adsorbents and revealed that the acicular Ni/Al LDH decorated PAB could be applied as efficient and simultaneous adsorbent for coexisting toxic pollutants situations.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials
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2018
·Vol. 11
·期 5
·836
·
IF 2.467
Tianxiang Li,Zhengren Shi,Xianru He,Ping Jiang,Xiaobin Lu,Rui Zhang,Xin Wang
With the aim of improving the anti-aging properties of nitrile-butadiene rubber (NBR), a functional organic filler, namely LDH–SAS, prepared by intercalating 4-amino-benzenesulfonic acid monosodium salt (SAS) into layered double hydroxides (LDHs) through anion exchange, was added to nitrile-butadiene rubber (NBR), giving the NBR/LDH–SAS composites. Successful preparation of LDH–SAS was confirmed by XRD, TGA and FTIR. LDH–SAS was well dispersed in the NBR matrix, owing to its strong interaction with the nitrile group of NBR. The obtained NBR/LDH–SAS composites exhibited excellent thermo-oxidative aging resistance as shown by TGA-DSC. Further investigation by ATR-FTIR indicated that SAS can capture the radical groups, even during the aging process, which largely accounts for the improved aging resistance.Keywords:layered double hydroxides (LDHs);nitrile-butadiene rubber (NBR);4-Amino-benzenesulfonic acid monosodium salt (SAS);thermal oxidative aging resistance properties
研究领域:
材料科学
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聚合物化学
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复合材料
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xinrui Zhang,Zhiyue Han,Zerui Li,Ziming Yu
Explosion accidents involving high-energy fuel present substantial hazards, underscoring the urgent need for effective safety protection methods. This study employed a hydrothermal method to synthesize nanoscale MgAl-LDHs and innovatively investigated their potential for explosion suppression in the high-energy system composed of RDX/Al. The performance of explosion suppression was evaluated using two novel testing methods capable of controlling the delay time for suppressant release. Experimental results indicate that MgAl-LDHs significantly surpass traditional suppressants, such as NH 4 H 2 PO 4 and NaHCO 3 , in their ability to reduce explosion overpressure and mitigate flames. Furthermore, it was found that reduce the suppressant release delay time is more critical than merely increasing the quantity of the suppressant used. By combining SEM, XPS, GC, and other characterization techniques with quantum chemical theoretical calculations, this study innovatively reveals the explosion suppression mechanism of MgAl-LDHs, elucidating the early decomposition mechanism of RDX and the suppression process of OH in MgAl-LDHs laminates. This research serves as a brand-new example of the application of LDHs materials in explosion suppression, providing novel ideas for future applications in the field.
研究领域:
材料科学
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安全工程
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物理化学
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纳米材料
·
燃烧与爆炸
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Xiaoting Hong,Enhao Zhu,Zhuoliang Ye,K.S. Hui,K.N. Hui
Phosphorus removal is essential to avoid eutrophication in water bodies. Layered double hydroxides (LDHs) are widely used to scavenge phosphate through intercalated ion exchange or surface complexation. Moreover, LDHs have attracted increasing attention as electrode modifiers for supercapacitors . Researchers have begun to re-delve the electrosorption technology according to the fundamental principle of electrical double layers. Herein, we propose a new phosphate removal method inspired by the adsorption characteristic and electrical double-layer capacitive properties of LDHs through electrosorption via capacitive deionization. We present a series of experiments to study the enhanced phosphate removal under an electric field via multiple mechanisms on the MgAl-LDHs/AC electrode. The uptake of phosphate by MgAl-LDHs/AC was investigated as a function of phosphate concentration, applied voltage, electrode materials , and temperature. The MgAl-LDHs/AC electrode possessed a salt removal capacity of 67.92 mg PO 4 3− ·g −1 (1.2 V, 250 mg·L −1 KH 2 PO 4 , 30 °C). The electrosorption kinetics of phosphate ions onto the capacitive deionization electrode followed the pseudo-second-order kinetics model rather than the pseudo-first-order kinetics model. Furthermore, the adsorption isotherms of phosphate on the MgAl-LDHs/AC electrode fitted the Freundlich model better than the Langmuir model. The proposed method could be used for phosphate removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Shengjie Xia,Guanhua Zhang,Zhiyan Gao,Yue Meng,Bo Xie,Hanfeng Lu,Zheming Ni
In this paper, the novel 3D hollow Z-scheme heterojunction photocatalysts based on Bi 2 O 3 and CoAl layered double hydroxides (Bi 2 O 3 @CoAl-LDHs) were prepared for efficient visible-light-driven photocatalytic ammonia synthesis . The synthesized nanohybrid exhibits excellent photocatalytic ammonia synthesis performance (48.7 μmol·L −1 ·h −1 ) and structural stability , which is primarily attributed to the fact that Z-scheme heterojunction significantly enhanced lifetime of photogenerated carriers (6.22 ns) and transfer efficiency of surface photogenerated electrons (72.5%). Strict control experiments and nitrogen isotope labeling results show that nitrogen and hydrogen in the produced ammonia come from nitrogen and water in the reactant respectively. Electron paramagnetic resonance (EPR) experiments and density functional theory (DFT) calculations further reveal that the built-in electric field due to the difference between Bi 2 O 3 and CoAl-LDHs is the key to constructing the Z-scheme heterojunction. In addition, results of partial density of states (PDOS) show that Co in Bi 2 O 3 @CoAl-LDHs composite is the active site for photocatalytic N 2 fixation.
研究领域:
材料科学
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光催化
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纳米技术
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能源化学
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环境科学
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无机化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dandan Li,Tan Li,Genyan Hao,Wenjun Guo,Shuai Chen,Guang Liu,Jinping Li,Qiang Zhao
A hybrid oxygen evolution catalyst, IrO 2 @single-layer NiFe layered double hydroxides (SL-NiFe LDHs), is successfully synthesized by anchoring highly dispersed IrO 2 nanoparticles to SL-NiFe LDHs nanosheets with oxygen vacancies. Typically, during the synthesis process, the functional group –NH 2 from the external anchor formamide acts as a coordination site to control the nucleation and growth of nanoparticles , which can ensure high dispersion without aggregation of IrO 2 on SL-NiFe LDHs. In addition, this reducing synthetic environment causes a large number of holes and grooves in the NiFe-LDHs nanosheets, which result in the formation of oxygen vacancies in the SL-NiFe LDHs. The loading of IrO 2 nanoparticles and the formation of oxygen vacancies endow IrO 2 @SL-NiFe LDHs with excellent performance for the oxygen evolution reaction (OER). IrO 2 @SL-NiFe LDHs nanosheets display outstanding OER performance with an overpotential of 270 mV at a current density of 10 mA cm −2 and good stability. Density functional theory (DFT) calculations indicate that the hybridization of IrO 2 and SL-NiFe LDHs accelerates the reaction step. Notably, the Ir sites at the edges are more conducive to the formation of oxygen, and the oxygen sites on SL-NiFe LDHs are more conducive to the cleavage of the O–H bond, thereby improving the OER activity. This work highlights a potential synthetic strategy that can combine nanoprecious metals with transition metals to prepare highly active electrocatalysts for efficient water oxidation reactions.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Xuyang Yan,Jian Zhang,Yanru Zhu,Zhe An,Jing He
Heterogeneous Fe-based electro-Fenton process has gained extensive attention for the refractory pollutants control. Nevertheless, insufficient Fe II /Fe II I cycle is still the key limitation to enhance the Fenton reaction. Herein, a strategy on the efficient Fe II /Fe III internal cycle using CoFe II Fe III -layered double hydroxides (CoFe II Fe III -LDHs) has been proposed, in which Fe species are atomically-distributed facilitating the interfacial charge-transfer and redox response. In the degradation of N,N-dimethylacetamide (DMAC), a typical organic pollutant in wastewater derived from pharmaceutical production, acrylic fibers, electronic chemicals, and fine chemical industries, the critical factors influencing degradation of DMAC were examined in detail. The degradation efficiency and the catalyst stability were investigated. CoFe II Fe III -LDHs achieved a DMAC removal of 100% within 75 min with an apparent rate constant of 0.0594·min −1 and a TOC removal of 70% after 4 h under the condition of DMAC concentration (50 mg·L −1 ), pH value (pH = 4), current density (40 mA·cm −2 ), O 2 flow rate (40 mL·min −1 ), and catalyst dosage (1.6 g·L −1 ), and the DMAC removal remained >93% after five cycles, which were both considerably superior to that only containing Fe II or Fe III . Moreover, the main free radicals and degradation pathways were elucidated according to radical capture experiments and mass spectrometry. The strategy was well tolerated in treating various organic pollutants.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shuanglian Jia,Wenfeng Li,Che Qian,Guofang Du,Zetian He,Yu Liang
Construction of ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction via an electrostatic self-assembly. • Type-II band alignment suppresses charge recombination and boosts charge separation. • Bifunctional design enables efficient H 2 evolution and pollutant degradation. • In-situ XPS and DFT calculations validate the proposed charge transfer pathway. Constructing efficient and stable heterojunction photocatalysts was crucial for achieving bifunctional applications in antibiotic degradation and photocatalytic hydrogen production. Herein, an ultrathin CoAl-LDHs/g-C 3 N 4 Type-II heterojunction was successfully fabricated via an electrostatic self-assembly strategy, and its performance was systematically evaluated for both ciprofloxacin (CIP) degradation and visible-light-driven hydrogen evolution reaction (HER). The optimal CAC2 sample (CAC2, mass ratio of 1:2) achieved a CIP degradation efficiency of 84.9%, which was 1.9-fold and 3.3-fold higher than those of pristine CoAl-LDHs (CAL) and g-C 3 N 4 (CN), respectively. Meanwhile, it delivered a remarkable hydrogen evolution rate of 1935.67 μmol·g −1 ·h −1 , which was 263.3 and 6.5 times higher than those of pristine CAL and CN, respectively. The significantly improved hydrophilicity of the heterojunction enhanced the interfacial enrichment of CIP. Active species trapping experiments confirmed that h + acted as the dominant reactive species, while ·O 2 - played an auxiliary role. Combining XPS, work function calculations, and in situ XPS under light irradiation, we strongly indicate that electrons spontaneously transfer from CAL to CN in the dark, establishing a built-in electric field (BIEF) oriented from CAL to CN. Upon light excitation, the photogenerated electrons migrate from CN to CAL following the typical Type-II pathway, which together with the BIEF synergistically facilitates spatial charge carrier separation. This study elucidated the structure-activity relationship of the electrostatic self-assembled Type-II heterojunction for bifunctional photocatalysis, offering a new paradigm for designing efficient and robust catalytic materials for environmental and energy applications. Download: Download high-res image (253KB) Download: Download full-size image
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Fangqing Wang,Wenli Pan,Ying Li,Limin Liang,Yoshiharu Uchimoto,Qiuyan Hao,Hui Liu,Shijian Zheng
High-entropy 3d transition-metal layered double hydroxides (LDHs) with an entropy-stabilized effect exhibit excellent long-term durability during the OER, but their catalytic activity remains unsatisfactory. Here, we utilize high-entropy MnFeCoNiCu LDH as a model system and introduce an electron acceptor, Au nanoparticles, to elevate the valence state of metal sites and boost the catalytic activity, requiring only a low overpotential of 202 mV at 10 mA cm–2 in 1.0 M KOH electrolyte. Most importantly, under industrial conditions (30 wt % KOH, 60 °C), the Au@MnFeCoNiCu LDH||Pt/C pair requires only 1.76 V to deliver 200 mA cm–2 in an anion exchange membrane electrolyzer and sustains 700 h of long-term durability without any decay. X-ray absorption spectroscopy, in situ Raman spectroscopy, and density functional theory calculations reveal that the boosted catalytic activity and stability are attributed to the improved chemisorption of OER intermediates and the strengthened metal–oxygen bonding caused by the elevated valence state of metal sites, respectively.
研究领域:
材料科学
·
电化学
·
催化反应
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）