Surfaces and Interfaces
·
2025
·
IF 6.3
Guang Yang,Jin Liang,Tian Lei,Yaxi Zhang,Li Zhang
Transition metal phosphides (TMPs) have emerged as promising candidates for the hydrogen evolution reaction (HER) due to their tunable phases and electronic structures. However, the development of bifunctional electrocatalysts that effectively balance HER and oxygen evolution reaction (OER) for overall water splitting presents a significant challenge. In this work, we report a novel cauliflower-like bimetallic phosphide, CoMo-P, synthesized on ZIF-67-derived NiCo layered double hydroxide (LDH) through a formic acid-assisted electrochemical phosphating process. This innovative approach not only enhances catalytic efficiency for both HER and OER but also offers a rapid, environmentally friendly, and straightforward fabrication method. The incorporation of formic acid during the electrodeposition process plays a crucial role in optimizing the catalyst's composition and microstructure. Specifically, formic acid facilitates the reduction rate of hypophosphite and stabilizes charged intermediates, thereby reducing the electrodeposition energy barrier and enhancing phosphating efficiency. As a result, the CoMo-P(NCL)/NF electrode demonstrates exceptional HER performance in alkaline media, achieving overpotentials of 55 mV and 108 mV at current densities of 10 and 50 mA cm ‑ 2 , respectively, significantly outperforming the control sample without formic acid addition (η 10 = 80.4 mV, η 50 = 142 mV). Moreover, the electrode exhibits remarkable OER activity with overpotentials of 273 mV and 310 mV at 10 and 50 mA cm ‑ 2 , respectively. When employed as a bifunctional catalyst for overall water splitting, the CoMo-P(NCL)/NF electrode pair requires a low cell voltage of 1.574 V to achieve a current density of 10 mA cm ‑ 2 , surpassing the performance of numerous reported bifunctional catalysts. This study provides a promising strategy for the rational design and practical application of high-performance bifunctional electrocatalysts in sustainable energy conversion systems.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Minghao Xu,Mei Qin,Xuerui Yang,Lei Zhou,Hui Liu
In this study, CoCuFe-LDH with SO 4 2− as interlayer anion was prepared by a pot solvothermal method, which exhibited excellent peroxymonosulfate (PMS) activation performance for the degradation of sulfamethoxazole (SMX) over a wide pH range (3.0–12.0). Under the optimal condition, the SO 4 2− -CoCuFe-LDH/PMS system resulted in 99.1 % SMX (10 ppm) degradation in 4 min. Even for 50 ppm SMX, the degradation efficiency and COD removal rate approached 93.3 % and 70.0 % within 10 min, respectively. The current catalyst showed excellent stability after 5 times recycling experiments. The high-valent metal-oxo species were the major reactive oxygen species, and the SO 4 •− , • OH, O 2 •− , and 1 O 2 were involved in the degradation of pollutant. The SO 4 2− interlayer could expand the interlayer spacing of LDH, which facilitated the diffusion of PMS and pollutants within the interlayer and improved the utilization efficiency of the active sites. The current study provided novel insights into the designation of LDH structures in advanced oxidation processes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xiaoyu Lu,Congling Li,Li Zhang,Wei Xia,Rui Liu,Aifeng Lv
The rational design of efficient, cost-effective, and durable electrocatalysts is crucial for the realization of hydrogen production through water splitting. The present study describes the synthesis of a novel three-dimensional (3D) volcano-like Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF (Layered Double Hydroxides/Nickel Foam) electrocatalyst with a highly wrinkled structure through a two-step hydrothermal method. The as-synthesized electrocatalyst exhibits an exceptionally low overpotential of 77 mV for the hydrogen evolution reaction (HER) and 131 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm −2 , owing to the unique morphology and strong electronic interactions between Fe 3 S 4 , Ni 3 S 2 and WO 3 heterostructures. The Fe 3 S 4 /Ni 3 S 2 /WO 3 /NiFe LDH/NF electrocatalyst demonstrates exceptional performance in overall water splitting when employed as both anode and cathode, achieving a current density of 10 mA cm −2 at an impressively low cell voltage of 1.5 V as well as exhibiting remarkable durability with little degradation over a period of 12 hours. This study presents a straightforward approach for the synthesis of highly efficient and durable non-noble metal catalysts for overall water splitting under hydrothermal conditions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qing Sun,Xiaofang Hu,Hang Wang,Hanhu liu,Yuanyuan Lin,Jian Zhang,Xiongbo Dong,Jiawei Sheng
Oxygen vacancies are prevalent in metal compounds and play a significant role in the activation of peroxomonosulfate (PMS) to mitigate water pollution. However, how to easily construct these oxygen vacancies and elucidate the mechanism of PMS activation by oxygen vacancies are still pending research and solution. This study presents the synthesis of a NiCoAl-LDH/Kaolin (NiCoAl-LDH/Kao) hybrid catalyst with quasi-2D layer structures morphology and abundant oxygen vacancies (OVs) for activating peroxymonosulfate (PMS). We proposed an intriguing phase transformation from NiCo-carbonate hydroxide (CH) to NiCoAl-layered double hydroxide (LDH), and elucidated the morphological evolution mechanism from nanorod to nanosheet structures through alkaline etching. The NiCoAl-LDH/Kao-PMS system exhibited excellent rapid kinetics and removal efficiency of norfloxacin (NOR), degrading 92.0 % of NOR within 10 min and achieving a final degradation rate of 97.2 %, along with remarkable reusability performance of the NiCoAl-LDH/Kao catalyst. Furthermore, reactive oxygen species including sulfate radical (SO 4 − ), hydroxyl radical ( OH), superoxide anion (O 2 − ) and singlet oxygen ( 1 O 2 ) were found to be involved in the degradation process of NOR, and the degree of activity of the active groups from strong to weak is 1 O 2 , SO 4 − , O 2 − and OH. The activation mechanism and conceivable degradation pathways of NOR were experimentally studied and proposed, and the toxicity of degradation intermediates was evaluated. The facile preparation method for NiCoAl-LDH/Kao nanocomposite holds potential for large-scale manufacturing in organic pollutant remediation, while also providing new insights on the indispensable role of OVs in heterogeneous catalysis.
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Green Energy & Environment
·
2024
·
IF 10.7
Xiaojie Xu,Huachen Lin,Jinrui Ding,Pengjie Zhou,Yulong Ying,Hong Jia,Longhua Li,Yu Liu
Nanostructure engineering and composition rationalization are crucial for materials to become candidates for high-performance supercapacitor. Herein, a novel core-shell heterostructured electrode, combining CoS hollow nanorods with NiCoMn-layered double hydroxides (LDH) ternary metal nanosheets, were prepared on carbon cloth by reasonably controlled vulcanization and electrodeposition. By optimizing electrodeposition conditions, the material's structure and properties can be fine-tuned. The enhanced capacitance of the optimized carbon cloth (CC)@CoS/NiCoMn-LDH-300 electrode (4256.0 F g −1 ) lies in the open space provided by CoS and the establishment of a new charge transfer channel across the interfaces of CC@CoS/NiCoMn-LDH-300 nanosheets. This is further demonstrated by Density functional theory (DFT) simulations based on OH − adsorption energy, which produces faster redox charge kinetics and significantly enhances the electrode's energy storage capacity. The hybrid supercapacitor, integrating the optimized CC@CoS/NiCoMn-LDH-300 electrode with active carbon, demonstrates the highest energy density of 86 Wh kg −1 (under the power density of 850 W kg −1 ) and the long cycle stability of 89.7%. This study aims to go beyond simple binary LDH by constructing a ternary LDH with a hierarchical core-shell heterostructure to provide an effective and feasible new concept for high-performance supercapacitor electrode materials via rational structure design.
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Environmental Science-Nano
·
2024
·Vol. 11
·期 3
·1142-1156
·
IF 5.8
Xiaohan Yang,Chenzhang Liu,Shuo Gao,Xiaolei Zhang,Ziwei Lan,Min Zuo,Jia Li
Micromotors capable of autonomous movement, sensitive detection and rapid removal of pollutants have attracted wide attention in environmental monitoring and water pollution remediation. In this paper, a ramie-derived hierarchical MgAl-LDH/MFZ@HRP magnetic microtube micromotor with peroxidase activity was proposed for simultaneous detection and removal of catechol from water. The Mn2O3 decomposition of H2O2 produces O2 bubbles to realize the chemical drive of the micromotor with a speed of 128.33 ± 5.012 μm s−1 (5% H2O2). Due to the high peroxidase activity and voluntary movement of MgAl-LDH/MFZ@HRP, catechol could be detected sensitively with a detection limit of 6.92 × 10−7 M. Moreover, catechol could be rapidly degraded by hydroxyl radical (˙OH) and superoxide anion (O2˙−) produced by Fenton reaction, and the degradation rate could reach 96%. This study provides a promising multifunctional micromotor for simultaneous determination and removal of organic pollutants from wastewater.
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Journal of Energy Storage
·
2025
·
IF 9.8
Peiyun Shu,Zhe He,Gentian Yue,Yueyue Gao,Jinghao Huo,Chen Dong,Furui Tan
The application of zeolite imidazole salt metal organic frameworks (ZIFs) and layered double hydroxides (LDHs) as bimetallic materials for supercapacitor electrodes is extensive, however, their inherent limitations hinder broader usage in supercapacitors. In this work, we developed a ZnNi-ZIF/LDH composite with a honeycomb structure through a sequential process involving ion doping and hydrolysis, utilizing ZIF-8 as a template to achieve a nanoscale honeycomb architecture. Subsequent phosphorization treatment yielded ZnNi-ZIF/LDH@P composite, further improving its conductivity. This process significantly enhanced the capacitive performance and stability of the composite electrode. The ZnNi-ZIF/LDH@P composite electrode revealed an excellent specific capacitance of 2855 F·g −1 at a current density of 2 A·g −1 , maintaining an impressive 93.4 % capacitance retention after 6000 charge-discharge cycles at a current density of 15 A·g −1 . The assembled ZnNi-ZIF/LDH@P//AC asymmetric supercapacitor was capable of powering a HENU light panel for at least 2 min, and its specific capacitance remained 96.4 % of the initial value after 4000 cycles at a current density of 5 A·g −1 . Overall, the ZnNi-ZIF/LDH@P composite demonstrates outstanding capacitance performance, highlighting its great potential in the field of energy storage.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mengru Liu,Taotao Zhe,Fan Li,Limin Zhu,Shaohui Ouyang,Li Wang
The excessive use of nitrofurantoin (NFT) represents a threat to ecosystems and food safety, making it necessary to develop efficient and accurate detection methods. Herein, the Ru/NiFe-LDH-MXene/SPCE electrode was successfully synthesized by one-step electrodeposition and employed to the NFT electrochemical sensing. Combining 2D MXenes with multifunctional 2D layered double hydroxides (LDHs) creates synergistic interactions within the MXene-LDH heterostructures, modifying the electrochemical performance. Furthermore, the incorporation of noble metal nanoparticles and nanoclusters can significantly enhance electrochemical performance by promoting favorable interactions at the metal-carrier interface and optimizing the rearrangement of electronic structure. Based on this, the developed Ru/NiFe-LDH-MXene/SPCE sensor demonstrates remarkable sensitivity (152.44 μA μM −1 cm −2 ) and an ultralow detection limit (2.2 nM). Notably, the sensor was employed for NFT detection in food samples with satisfactory recoveries, making it a promising electrochemical sensor for the detection of NFT.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 28
·41032-41045
·
IF 0
Sun Ying,Wang Zexu,Zhang Shijie,Liu Chuyin,Xu Yunfeng
The problem of soil and water contamination caused by Cr(VI) discharged from the dyeing, electroplating, and metallurgical industries is becoming increasingly serious, posing a potentially great threat to the environment and public health. Therefore, it is crucial to develop a fast, efficient, and cost-effective adsorbent for remediating Cr-contaminated wastewater. In this work, MgAl-LDH/commercial-activated carbon nanocomposites (LDH-CACs) are prepared with hydrothermal. The effects of preparation and reaction conditions on the composite properties are first investigated, and then its adsorption behavior is thoroughly explored. Finally, a potential adsorption mechanism is proposed by several characterizations like SEM–EDS, XRD, FTIR, and XPS. The removal of Cr(VI) reaches 72.47% at optimal conditions, and the adsorption study demonstrates that LDH-CAC@1 has an extremely rapid adsorption rate and a maximum adsorption capacity of 116.7 mg/g. The primary removal mechanisms include adsorption-coupled reduction, ion exchange, surface precipitation, and electrostatic attraction. The reusability experiment illustrates that LDH-CAC@1 exhibits promising reusability. This study provides an effective adsorbent with a remarkably fast reaction, which has positive environmental significance for the treatment of Cr(VI) wastewater.
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PubMed
Water
·
2024
·Vol. 17
·期 1
·24
·
IF 3
Yiqiong Yang,Yubin Zhang,Xuyang Gao,Zitong Yang,Haozhou Wang,Xiaodong Zhang
To overcome the disadvantage of difficult recovery of powder catalysts and improve catalyst utilization, the selection of foam metal substrates as supports can reduce the difficulty of material recovery and effectively inhibit the leaching of metal ions. Herein, CoMnNi-layered double hydroxide (LDH) derived from Co-Mn ZIF was immobilized onto nickel foam (NF) through in situ synthesis. The results of XRD and SEM analyses of the samples indicated that the LDH was successfully grown on the nickel foam matrix, and the material could maintain its original morphology to the maximum extent after loading. By comparing the XPS of the material before and after the reaction, it was confirmed that the surface hydroxyl group and C=O of the material were involved in the activation of peroxymonosulfate (PMS). The results of the quenching reaction showed that SO4•−and1O2are the main active substances in the oxidation of enrofloxacin (ENR). When the dosage of NF@CoMnNi-LDH was 0.4 g/L, the pH of the solution was 6.82, and when the dosage of PMS was 2.0 mM, the degradation rate of ENR reached 82.6% within 30 min. This research offers novel insights into the degradation of antibiotics from water using a monolithic catalyst supported by metal foam.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Danni Li,Xiang Shao,Mushtaq Muhammad Umair,Fubin Hou,Sa Li,Yingming Tang,Limei Cao,Ji Yang
Efficient non-precious metal electrocatalysts are crucial for hydrogen production through water electrolysis . Combining a superhydrophilic electrocatalyst with oxygen vacancy and a conductive carbon matrix is significant for NiFe LDH-based oxygen evolution reaction (OER) applications. In this study, NiFe LDH nanoflowers and Co-doped NiFe LDH nanoneedles were synthesized on graphite felt through an in-situ self-assembly strategy. Further results have shown that doping Co into NiFe LDH nanoarrays significantly enhances the specific surface area and oxygen vacancy density, while the graphite felt serves as a conductive scaffold and prevents active sites detachment. Oxygen vacancies in Co 3 –Ni 7 Fe 3 LDH/TGF adjust the electronic configuration, and superhydrophilicity promotes effective electrolyte diffusion. This synergy endows Co 3 –Ni 7 Fe 3 LDH/TGF with excellent OER performance, lower overpotential of 252 mV (10 mA cm −2 ), a Tafel slope (63.13 mV), and stability at high current densities . This research provides a new perspective for utilizing non-precious metal catalysts on carbon substrates for hydrogen production .
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Abdelazeem S. Eltaweil,Ahmed E. Awad,Eman M. Abd El-Monaem,Azza M. Shaker,Gehan M. El-Subruiti
The growing issue of Pb 2+ ions contamination in marine environments necessitates the development of effective adsorbents to significantly mitigate this ecological challenge. In response, a novel composite material comprising layered double hydroxide (LDH), boron nitride (BN), and tin ferrite (SnFe 2 O 4 ) was synthesized for the removal of Pb 2+ ions. The synthesized SnFe 2 O 4 /BN/NiAl-LDH composite was characterized using FTIR, XRD, ZP, SEM, and XPS techniques. Pb 2+ ions removal reached equilibrium within 30 minutes, with a removal efficiency of 95.42%. Pb 2+ removal efficiency increased progressively in the following order based on the data: SnFe 2 O 4 /BN/NiAl-LDH (1:1) > SnFe 2 O 4 /BN/NiAl-LDH (3:1) > SnFe 2 O 4 /BN/NiAl-LDH (1:3). Furthermore, the experimental data were consistent with the Langmuir and Freundlich isotherms, as well as the pseudo-second-order kinetic model, with a maximum adsorption capacity of 434.8 mg/g. Notably, the composite retained over 70% removal efficiency after five cycles, demonstrating its efficient recyclability. In summary, SnFe 2 O 4 /BN/NiAl-LDH exhibits rapid and efficient adsorption, easy separation, and excellent recyclability.
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