APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Menghui Li,Liang Fang,Hua Zhou,Fang Wu,Yi Lu,Haijun Luo,Yuxin Zhang,Baoshan Hu
In this paper, Nickel–Cobalt layered double hydroxide (NiCo-LDH) nanosheets were first in situ synthesized on MXene (Ti 3 C 2 ) via a simple hydrothermal method , then glucose sensing performance based on three-dimensional porous MXene/NiCo-LDH nanocomposite was explored. At a working potential of 0.45 V (vs. SCE), the glucose sensor exhibits a wide linearity range (0.002 mM–4.096 mM), a low limit of detection (0.53 μM) and a rapid response (<3 s). Moreover, good selectivity , reproducibility and stability were also obtained. And the excellent performance can attribute to large area of contact of materials surface with glucose, fast electron transfer rate and easy diffusion of electrolyte provided by the novel 3D porous NiCo-LDH nanosheets on the conductive MXene substrate. Therefore, MXene/NiCo-LDH composites will be a candidate for electrochemical detection of glucose.
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ELECTROCHIMICA ACTA
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2019
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IF 5.383
Liming Ren,Chao Wang,Wen Li,Ruohao Dong,Hongxia Sun,Ning Liu,Baoyou Geng
Designing highly efficient bifunctional water splitting electrocatalyst is essential to ease the forthcoming energy crisis and the increasingly severe environmental problems. In this paper, NiFe-LDH@Ni 3 S 2 arrays on nickel foam (NF) are prepared via a facile two-step hydrothermal approach. The catalyst with a special structure of on-chip epitaxial growth of sheet grown vertically on nickel foam not only provides enhanced interface connections and massive exposed active sites but also accelerates the transmission of electronics. The experimental results demonstrate that Ni1Fe10-LDH@Ni 3 S 2 /NF possesses exceptional electrocatalytic performance for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) compared to individual NiFe-LDH and Ni 3 S 2 . It demands 230 mV to drive a current density of 50 mA cm −2 toward OER while it just needs 197 mV to afford 20 mA cm −2 for HER. Additionally, Ni1Fe10-LDH@Ni 3 S 2 /NF as both cathode and anode in a two-electrode system just requires 1.65 V to reach 10 mA cm −2 and still remains stable after a 12 h chronoamperometry measures. The as-synthesized electrocatalyst with improved electrocatalytic performance, outstanding long-term stability and low-priced is prospective for overall water splitting practical production.
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ChemSusChem
·
2024
·
IF 7.5
Feng Zhang,Yu Lei,Guang Li,Yangchen Xie,Xinjia Guo,Xiaoyan Zhang,Xianyou Wang
Graphical ORR or OER : CoFe layered double hydroxide (CoFe-LDH) nanosheets are deposited on nitrogen-doped graphite-carbon polyhedra with FeCo alloy nanoparticles to form a composite bifunctional oxygen electrocatalyst. The FeCo/LDH-NGCP catalyst shows wonderful ORR and OER bifunctional electrocatalytic performance, which is superior to that of the precious metal based catalyst. Reasonably screening the targeted oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) constituents and constructing high-efficiency and stabilized ORR/OER bifunctional electrocatalysts are pivotal for the advancement of rechargeable zinc-air batteries (ZABs). Here, CoFe layered double hydroxide (CoFe-LDH) nanosheets are deposited on nitrogen-doped graphite-carbon polyhedra with FeCo alloy nanoparticles (FeCo/LDH-NGCP). Due to the synergic effect between FeCo-NGCP, CoFe-LDH and FeCo/LDH-NGCP, the electrocatalyst with the abundant and accessible active sites can provide good charge/mass transfer, and thus shows wonderful ORR and OER bifunctional electrocatalytic performance. In ORR tests, FeCo/LDH-NGCP catalyst displays larger half-wave potential (E 1/2 , 0.89 V vs. 0.85 V), higher limiting current density (J L , 5.91 mA/cm 2 vs. 5.14 mA/cm 2 ) and better stability than commercial Pt/C. As for OER, FeCo/LDH-NGCP possesses a smaller overpotential (η) of 299.6 mV at a current density of 10 mA/cm 2 and more durable stability than commercial RuO 2 (330.6 mV). Furthermore, in ZAB tests, the cycling stability of ZAB-FeCo/LDH-NGCP (over 470 h) outperforms the ZAB-Pt/C+RuO 2 (92 h) with commercial electrocatalyst (Pt/C+RuO 2 ). Therefore, the FeCo/LDH-NGCP catalyst offers a new perspective to construct ZABs bifunctional catalysts and their commercial application in ZABs.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Qianqian Qin,Hongliang Xu,Shiping Sun,Zhiyuan Zhao,Xiufeng Ren,Mingliang Li,Bo Song,Gang Shao,Hailong Wang,Hongxia Lu
2D/2D MgAl-LDH/g-C 3 N 4 composites were synthesized via electrostatic self-assembly method in aqueous solution. The MgAl-LDH nanosheets were uniformly anchored on the surface of g-C 3 N 4 nanosheets, which constructed a MgAl-LDH/g-C 3 N 4 heterojunction, thus facilitated the separation and transport of photogenerated electron and hole pairs and improved the photocatalytic degradation performance. The photocatalytic activity of the MgAl-LDH/g-C 3 N 4 composites strengthened with the increasing of MgAl-LDH content, reached the optimum for the sample 30 %MACN (containing 30 wt% of MgAl-LDH), and then gradually decreased. Under the visible light irradiation for 150 min, 30 %MACN composite degraded 80.1 % of ciprofloxacin (CIP), and its first-order reaction rate constant was 2.04 times that of pure g-C 3 N 4 nanosheets. Additionally, the effects of the catalyst dosage, pH value and the initial concentration of CIP on the degradation efficiency of CIP were investigated. Moreover, 30 %MACN exhibited outstanding stability and recyclability, as well as good universality for degrading organic pollutants, including norfloxacin, methylene blue, tetracycline and crystal violet. The degradation pathway and the mechanism of CIP were proposed. This work provided a feasible green way to synthesis MgAl-LDH/g-C 3 N 4 composite photocatalyst with high performance for removing pollutants in wastewater.
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Materials Chemistry Frontiers
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2024
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IF 6
Yanan Zhang,Nuo Xu,Jipeng Xu,Chi Shan,Junlei Chen,Liyuan Guo,Long Qin,Fan Wu,Wenhuan Huang
The micro/nano-structural design of 2D-interlayers greatly enhances the electrochemical energy and kinetics as supercapacitor electrode. Herein, a hetero-Co9S8 QDs doped 2D CoNi-LDH with the proper content was constructed through diverse sulfurization times, showing 3D flower-like microsphere. The highly dispersed active QDs on 2D layers promoted both rapid ion/electron transfer kinetics and electrochemical storage capacity, which were evidenced by experiments and density function theory calculations. As a result, the assembled hybrid supercapacitor QDs-Co9S8/CoNi-LDH//activated carbon displays a maximum energy density of 33.3 Wh·kg-1 at a power density of 820.0 W·kg-1. Furthermore, the in-depth analysis of interlayer ion diffusion and formation of quantum dots in heterostructure provide a good way for synthesizing high performance electrode materials with adjustable size and composition.
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Chemistry-Switzerland
·
2024
·Vol. 6
·期 2
·312-322
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IF 2.4
Jing Ning,Li Xu,Wei Xu,Guizhen Li,Wen Zhang
Oxygen evolution reactions (OER) are often the decisive step in determining the water electrolysis rate. The first row of transition metals and their derivatives, represented by Ni and Fe, have attracted much attention due to their excellent OER performance. Here, we develop a one-step strategy for preparing oxygen-evolving electrodes, in which the NiFeOOH-modified NiFe layered double hydroxide (NiFe-LDH) nanosheet is supported by nickel foam. At 100 mA·cm−2, the overpotential of NiFeOOH-NiFe-LDH was just 227 mV, and the duration times were over 200 h in 1 mol·L−1KOH. Furthermore, the co-existence of LDH and hydroxyl oxides helps the oxygen evolution reaction. These results suggest the potential for this synthesis strategy to provide a low-cost, highly active OER electrocatalyst for industrial water splitting.
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VACUUM
·
2024
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IF 3.8
Xiu Wen,Zhixiu Yang,Lijing Gao,Ruiping Wei,Xiaomei Pan,Jin Zhang,Guomin Xiao
Electrocatalytic reduction of CO 2 affords a potential way to mitigate the greenhouse effect and fuel crisis. In this work, we compared highly-dispersed CuO nanocomposites and Cu–Cu 2 O nanocomposites which all derived from Cu x Al-LDH for CO 2 electrochemical reduction . The Cu–Cu 2 O based nanocomposites obtained through the restoration strategies still retain its layered structure, simultaneously increasing dual Cu–Cu 2 O active sites, which exhibit excellent performance in selective reduction of CO 2 to C 2 H 4 . The Cu 5 Al-ER obtained through in-situ electrochemical reduction is modified by bulk phase, which can regulate active species, increase surface active sites, enhance C–C coupling. Meanwhile, the electrochemical strategy offers numerous benefits, including gentle conditions, adjustable monitoring, exceptional efficiency and adaptability. We have confirmed that cost-effective Cu–Cu 2 O based nanocomposite derived from Cu 5 Al-LDH can effectively promote C–C coupling during electrochemical CO 2 conversion and improve FE C2H4 . The FE C2H4 of Cu 5 Al-ER reaches 36% at −1.2 V vs. RHE. And the current density reaches −172 mA·cm −2 at −1.6 V vs. RHE. The results showed that compared to Cu 5 Al-LDO, the FE C2H4 of Cu 5 Al-ER increased by 2.6 times. In addition, Cu 5 Al-ER exhibits excellent stability during the 12 hours CO 2 catalytic reduction process.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Jia Li,Wentao Liu,Yang Li,Zhi Liu,Yang Liu
A series of hierarchical flower-like CdS/carbon quantum dots/NiAl-LDH (CCL) photocatalyst have been successfully prepared to achieve efficient conversion of CO 2 -to-CO via a simple yet effective hydrothermal method. In the CCL, interspersed-CQDs not only increase the number of reactive sites but also reduce inner electronic impedance with the assistance of light reflecting-scattering effect. This significantly improves electron migration efficiency and inhibits the recombination of photoinduced electron-holes pairs. Without any sacrificial agent or photosensitizer, the sample of CCL-1 exhibits the highest CO evolution rate of 7.04 μmol·g −1 ·h −1 in water under simulated sunlight illumination with a large specific surface area (129.15 m 2 g −1 ) and an appropriate CQDs content of 15.2 wt%, which is 12.8- and 11.2-fold higher than those of pristine LDH, pure CdS, and many previously reported LDH-based counterparts. A type-Ⅱ interfacial charge transfer mechanism is proposed, where electrons migrate rapidly from CdS to LDH with highly-interspersed CQDs as unhindered electron conduction bridges. The present work outlines a simple and controllable LDH-based heterojunction, which give rise to superior photocatalytic activity for CO 2 photoreduction.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Yue Pan,Haonan Hu,Hongyi Tang,Chunyan Huang,Hao Ma,Wei Xu,Ruimei Fang,Wenyan Xiao,Fan Dong
Surface defect engineering has been regarded as an appealing strategy to improve photocatalytic performance, but defects are susceptible to inactivation and thus lose their function as active sites. In this study, we successfully tailored and identified the dynamic evolution of surface hydroxyl defects over ZnTi-layered double hydroxide (ZnTi-LDH) photocatalyst. The enrichment of surface hydroxyl electrons and the dynamic circulation of hydroxyl defects result in enhanced separation and transport capabilities of photogenerated carriers, thereby ensuring the perpetual activation of small molecules into •O 2 − and •OH. The optimized structure has demonstrated NO removal efficiency values as high as 70.0 %, while concurrently suppressing the emission of NO 2 — a dangerous byproduct. Furthermore, ZnTi-LDH exhibits remarkable adaptability to varying environmental conditions and satisfactory durability over extended periods of reaction. This research offers valuable insights into the key role of surface hydroxyl in sustainable NOx removal technologies, and the findings contribute significantly to the advancement of environmental remediations.
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JOURNAL OF SOLID STATE CHEMISTRY
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2024
·
IF 3.2
Fuwei Yang,Xilin Liu,Pengfei Liu,Jiayin Li,YiZhuo Wang,Jianrong Xue,Hu Zhou
In this work, a 2D-3D activator De@NiFe-LDH was constructed by in-situ growth of 2D NiFe layered double hydroxide (NiFe-LDH) on the surface of 3D diatomaceous earth (De). The analysis of SEM, XRD, FTIR, XPS and BET were used to characterize the samples. The as-prepared De@NiFe-LDH achieved 99.4 % removal of tetracycline hydrochloride (TC) via activation of peroxymonosulfate (PMS). Singlet oxygen ( 1 O 2 ) was verified as dominant reactive oxygen species responsible for TC removal via quenching tests. Mechanism investigation suggested that the redox cycles of Ni 2+ /Ni 3+ and Fe 2+ /Fe 3+ on the surface of De@NiFe-LDH were crucial for PMS activation. In addition, the reasonable reusability and versatility of De@NiFe-LDH as well as low-toxicity of treated water endowed the De@NiFe-LDH/PMS system with a wide range of applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Huan Xing,Xiaoyang Deng,Xiaoguang Wang
Transition metal double hydroxides (LDHs) are among the most promising electrode materials in electrochemical energy storage. In this study, we synthesized electrodeposited nickel–cobalt layered double hydroxide (NiCo−LDH) to investigate the significant capacity gap in LDHs at different scan rates in an alkaline electrolyte. Experimental results demonstrate that the degradation of capacity at high scan rates is primarily attributed to the slow ion diffusion and the decreased reversibility of active metal ions. Furthermore, by exploiting the low reversibility of the deprotonation reaction at high scan rates, a NiCo−LDH with enriched hydrogen vacancies (H v −rich LDH) was obtained. Consequently, the H v −rich LDH, when used as the cathode in a magnesium ions hybrid supercapacitor (Mg−HSC), exhibits a high specific capacity of 94.97mAh g −1 at a current density of 1 A g −1 and maintains a significant capacity of 41.90 mAh g −1 even at 20 A g −1 . Moreover, a Mg−HSC device assembled with an H v −rich LDH cathode and a VS 2 anode delivers a high energy density of 48.44 Wh kg −1 and a power density of 937.49 W kg −1 , demonstrating its practical application value. This work not only provides a theoretical basis for the defect design of LDHs but also expands their applicability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Chaowei Luo,Jie Xiong,Hongyan Zeng,Mengchen Liao
Heterointerface engineering is an effective strategy to design and construct high-performance photocatalysts. Herein, polyaniline (PANI) nanoparticles and ZnTi layered double hydroxide (ZnTi-LDH) nanosheets were integrated to form organic–inorganic heterostructure (PANI/LDH) via d – π electronic coupling using in-situ polymerization for photocatalytic oxidation/reduction towards tetracycline (TC) and Cr(VI). The photocatalytic activity was closely related to feed amount of aniline (Ani) in the polymerization process, which the abundant PANI nanoparticles were evenly distributed on the surface of ZnTi-LDH nanosheets at the proper Ani feed amount, and thus reinforced d –π electronic coupling at the organic–inorganic interfaces more efficiently. Density functional theory calculations further verified the existence of d –π overlap at the PANI/LDH heterointerface. The strong d –π coupling boosted charge separation and transfer to improve photocatalytic efficiency. As a result, the optimal PANI/LDH (0.3) exhibited outstanding photocatalytic activities with 97.8 % Cr(VI) reducing rate and 87.8 % TC removal rate in the single Cr(VI) and TC system, as well as high simultaneous removal rate of Cr(VI) and TC in TC/Cr(VI) coexistence system, respectively. Subsequently, the photocatalytic enhanced mechanisms were put forward to remove Cr(VI) and TC under visible-light. Finally, the aquatic toxicity of the photolytic products was evaluated using Chlorella sp. as an ecological indicator, showing that the PANI/LDH had a notable detoxification efficiency of TC and Cr(VI).
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