Nanomaterials
·
2021
·Vol. 12
·期 1
·127
·
IF 5.076
Qining Wang,Quanwang Yan,Yu Zhao,Jie Ren,Ning Ai
Cu-Mg-Al layered double hydroxides (LDHs) with amine modification were prepared by an organic combination of an anionic surfactant-mediated method and an ultrasonic spalling method usingN-aminoethyl-γ-aminopropyltrimethoxysilane as a grafting agent. The materials were characterized by elemental analysis, XRD, SEM, FTIR, TGA, and XPS. The effects of the Cu2+content on the surface morphology and the CO2adsorption of Cu-Mg-Al LDHs were investigated, and the kinetics of the CO2adsorption and the photocatalytic reduction of CO2were further analyzed. The results indicated that the amine-modified method and appropriate Cu2+contents can improve the surface morphology, the increase amine loading and the free-amino functional groups of the materials, which were beneficial to CO2capture and adsorption. The CO2adsorption capacity of Cu-Mg-Al N was 1.82 mmol·g−1at 30 °C and a 0.1 MPa pure CO2atmosphere. The kinetic model confirmed that CO2adsorption was governed by both the physical and chemical adsorption, which could be enhanced with the increase of the Cu2+content. The chemical adsorption was suppressed, when the Cu2+content was too high. Cu-Mg-Al N can photocatalytically reduce CO2to methanol with Cu2+as an active site, which can significantly improve the CO2adsorption and photocatalytic conversion.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 30
·2401694
·
IF 27.4
Yin Zhu,Yanxu Chen,Yafei Feng,Xiangmin Meng,Jing Xia,Genqiang Zhang
Hydrazine oxidation-assisted water splitting is a critical technology to tackle the high energy consumption in large-scale H 2 production. Ru-based electrocatalysts hold promise for synergetic hydrogen reduction (HER) and hydrazine oxidation (HzOR) catalysis but are hindered by excessive superficial adsorption of reactant intermediate. Herein, this work designs Ru cluster anchoring on NiFe-LDH (denoted as Ru c /NiFe-LDH), which effectively enhances the intermediate adsorption capacity of Ru by constructing Ru─O─Ni/Fe bridges. Notably, it achieves an industrial current density of 1 A cm −2 at an unprecedentedly low voltage of 0.43 V, saving 3.94 kWh m −3 H2 in energy, and exhibits remarkable stability over 120 h at a high current density of 5 A cm −2 . Advanced characterizations and theoretical calculation reveal that the presence of Ru─O─Ni/Fe bridges widens the d-band width (W d ) of the Ru cluster, leading to a lower d-band center and higher electron occupation on antibonding orbitals, thereby facilitating moderate adsorption energy and enhanced catalytic activity of Ru.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Junhua Zou,Zhitong Wang,Wei Guo,Binbin Guo,Yan Yu,Ling Wu
ZnTi-LDH nanosheets have been synthesized as photocatalysts for selective oxidation of benzyl alcohol (BA) to benzaldehyde (BAD) under visible light irradiation. Based on UV–vis DRS, in-situ FTIR and XPS results, it was revealed that BA would be efficiently chemisorbed and activated on ZnTi-LDH forming the surface coordination species, which contributed to harvesting visible light and induced the photocatalytic reaction. The ESR spectra suggested that oxygen vacancies would be produced in ZnTi-LDHs after the adsorption of BA molecules. More exposed surface OH groups would induce more oxygen vacancies, which would serve as the centers for capturing photoelectrons from the photoexcited surface coordination species and act as active sites for enhanced O 2 adsorption and activation, resulting outstanding photocatalytic activity. Finally, a possible mechanism was proposed to illustrate the photocatalytic process which mediated by surface coordination species formed by the interaction between ZnTi-LDH and BA.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jinghao Hua,Sheng Feng,Changchang Ma,Haitao Huang,Kai Wei,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian
In this study, a novel 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst was prepared by combining NiFe-LDH with Bi 5 O 7 Br through self-assembly. Under simulated solar irradiation, compared with pure NiFe-LDH and Bi 5 O 7 Br, the 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst revealed a significant improvement in the efficiency of photocatalytic reduction of CO 2 . Z-scheme heterojunction promotes the separation of photo generated charge carriers and 2D/2D structure is conducive to exposing more active site and enhancing the migration rate of interface carriers. The photocatalytic activity experiment revealed that the CH 4 production efficiency of the Bi 5 O 7 Br/NiFe-LDH (37.77 μmol/g/h) after 8 h of light exposure was 2 times and 10 times that of Bi 5 O 7 Br (22.41 μmol/g/h) and NiFe-LDH (3.84 μmol/g/h), respectively. The successful formation of Z-scheme heterojunction was determined through band analysis and related characterization. The advantage of Z-scheme heterojunction is that it has high electron mobility and low resistivity. This work launches a feasible design strategy of special structure photocatalysts to enhance the photocatalytic activity for the CO 2 reduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·6018
·
IF 4.2
Qianqian Dong,Qijun Zhong,Jie Zhou,Yuhao Li,Yujing Wang,Jiayang Cai,Shuangwei Yu,Xiong He,Shaohui Zhang
The oxygen evolution reaction (OER), which involves a four-electron transfer and slow kinetics, requires an efficient catalyst to overcome the high energy barrier for high-performance water electrolysis. In this paper, a novel Ni3S2@V-NiFe(III) LDH/NF catalyst was prepared via a facile two-step hydrothermal method. The constructed heterostructure of Ni3S2@V-NiFe(III) LDH increases the specific surface area and regulates the electronic structure. Furthermore, the introduction of the V element forms an electron transport chain of Ni-O-Fe-O-V-O-Ni, which optimizes the binding energy between metal active sites and oxygen evolution reaction intermediates, accelerates electron transfer, and improves self-reconstruction. With this dual regulation strategy, Ni3S2@V-NiFe(III) LDH/NF exhibits exceptional OER performance with an overpotential of 280 mV at 100 mA/cm2and a Tafel slope of 45.4 mV/dec. This work develops a dual regulation strategy combining heterostructure formation and the doping effect, which are beneficial in the design of efficient OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiale Xing,Zhiqiang Xu,Daoxin Liu,Bing Xue,Fangfei Li
Developing high-performance non-noble metal-based electrocatalysts for oxygen evolution reaction (OER) is important for hydrogen production from water electrolysis. In this work, a unique method to simultaneously improve the catalytic activity and stability of NiFe 2 O 4 spinel is carried out through heterogeneous nucleation sintering. So that the resultant corrugated CoCr-LDH nanosheets can strongly combine onto NiFe 2 O 4 surfaces to form finned structures, which enhances the surface area and OER catalytic performance of the resultant catalysts. The optimized NiFe 2 O 4 @CoCr-LDH/NF exhibits excellent OER performance with a low overpotential of 193 mV at 10 mA cm −2 and a low Tafel slope (27.5 mV dec −1 ), and outstanding stability performance. Furthermore, the NiFe 2 O 4 @CoCr-LDH/NF also displays attractive bifunctional catalytic activities, which achieves an ultra-low voltage for overall water splitting of 1.546 V at 10 mA cm −2 . These results indicate that NiFe 2 O 4 @CoCr-LDH/NF is a promising low-cost catalyst for hydrogen production through water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yue Shi,Jiejie Bai,Aixin Ma,Zhitao Zou,Yanru Liu,Haifeng Lin,Dehong Chen,Ruiyong Zhang,Jianping Lai,Lei Wang
The superior electrocatalysts for seawater oxygen evolution reaction (OER) require fast kinetic to promote reactant (OH − ) transport and adsorption, and to optimize oxygenated intermediates (O* and OOH*) adsorption, but also high corrosion resistance by impeding Cl − adsorption under harsh seawater conditions, while the incomprehensive design greatly hinder the system advancement at high current densities. Herein, we propose orderly incorporating amorphous FeSe nanosheets as the dynamic anti-corrosion layer to reinforce charge redistribution of CoNi layered double hydroxide (LDH) nanosheets array and create favorable microenvironments. The ordered two-dimensional/three-dimensional structure prepared by novel non-equilibrium electrodeposition strategy allows amorphous FeSe component not only to activate CoNi-LDH for promoting OH − adsorption, optimizing oxygenated intermediates adsorption and increasing Cl − adsorption energy, but also repel Cl − by dynamic polyanion layer without blocking active sites, thus affording effective seawater OER with low overpotential, excellent stability and high selectivity at high current densities. The integrated CoNi-LDH/FeSe electrode delivers a small overpotential (338 mV at 500 mA cm −2 ) and possesses outstanding stability and selectivity during a 500-hour durability test at 500 mA cm −2 in alkaline seawater.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 39
·59224-59234
·
IF 5.19
Huang Congxin,Tang Chaochun,Wu Qingqing,Zhu Qing
Due to the layered structure and recycling characteristics, magnetic MnFe 2 O 4 /ZnFe-LDH was prepared by co-precipitation. In this study, we intensively explored MnFe 2 O 4 /ZnFe-LDH for water purification compared with the ZnFe-LDH. The morphological and structural characteristics of the obtained products were systematically characterized. MnFe 2 O 4 /ZnFe-LDH exhibits the maximum adsorption capacity of 94.52 mg/g for phosphate and 49.03 mg/g for Cr (VI), respectively, which is superior to that of the ZnFe-LDH, indicating that the magnetic MnFe 2 O 4 effectively enhanced adsorption performance. Meanwhile, the mechanism of adsorption of phosphate and Cr (VI) was briefly studied, where the metal center ion in MnFe 2 O 4 /ZnFe-LDH and between layers of SO 4 2− serves as capture sites for phosphate and Cr (VI) removal. Furthermore, the MnFe 2 O 4 /ZnFe-LDH can be used for magnetic recycled and still maintained excellent removal efficiency (70%) for phosphate and Cr (VI) after five adsorption–desorption cycles. This work could open a new vista of designing magnetic novel adsorbents in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1627-1637
·
IF 2.8
Yu Rui,Wang Qing,Li Zhaokuan,Su Hao,Lan Yongzhi
By designing the composition of transition elements and combining the adjustable structure of MOFs, it is reported that the synthesis of bimetallic ZnCo-MOFs based on different Zn/Co molar ratios, then the NiZn 1 Co 2 -LDH nanospheres are synthesized by Ni 2+ hydrolysis. Compared with the bimetallic NiZn-LDH and NiCo-LDH, the trimetallic layered hydroxide NiZn 1 Co 2 -LDH after adding Zn 2+ reached a high specific capacity of 217.3 mAh g −1 at 1 A g −1 . Additionally, both have excellent cycle stability (84.6% capacity retention after 5000 charge–discharge cycles at 10 A g −1 ) and strong rate performance (72.47% capacity retention rate at 10 A g −1 ) as well. Furthermore, a hybrid supercapacitor (HSC) with NiZn 1 Co 2 -LDH as positive electrodes and activated carbon as negative electrodes was fabricated. The HSC device delivered a high energy density of 45 Wh kg −1 at a power density of 774.1 W kg −1 and excellent cycling stability (specific capacity retention of 92% after 10,000 cycles).
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
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.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 9
·2931-2947
·
IF 5.721
Yanbing Li,Guorong Wang,Yanbin Wang,Zhiliang Jin
Two photo-active materials with opposite surface potentials, NiTiO3 with a negative potential and CoAl LDH with a positive potential, have been rationally integrated into two-dimensional (2D) active plane phosphated-CoAl LDH with rich active sites and three-dimensional (3D) hollow NiTiO3 rods with more negative zeta potential. The delicate architecture can efficiently accelerate the separation and migration of photo-excited electrons, make the surface potential more negative, enhance thermodynamic H2 evolution reaction, and offer rich active planes for photo-catalytic redox reactions. Based on these highlighted photo-catalytic benefits, the optimal composite exhibits more prominent photo-catalytic hydrogen evolution performance compared with NiTiO3 or CoAl LDH materials alone under visible irradiation. In detail, the stereoscopic catalyst, constructed by phosphating CoAl LDH layers anchored on NiTiO3 hollow rods, exhibits a hydrogen evolution activity of about 594 μmol 5 h−1, which is 11.6 times and 14.8 times that of CoAl LDH (51 μmol 5 h−1) and NiTiO3 (40 μmol 5 h−1) alone, respectively. Also, the density functional theory results reveal the good conductivity, which is beneficial for charge migration in the hybrid sample. The results from the thoroughly conducted characterization studies such as TEM, SEM, XPS, XRD, UV-vis DRS, transient photocurrent, and FTIR spectroscopy have been well researched and they are in good agreement with each other.
研究领域:
材料科学
·
能源化学
·
表面科学
✓ 已验证
DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 3
·88
·
IF 3
Jingjing Dai,Guofei Li,Yuanyuan Wang,Cancan Zhang,Hui Nan,Guijun Yang
During the process of producing potassium fertilizer from salt lake resources, a large amount of waste liquid brine, rich in raw materials such as magnesium chloride, is generated. In this work, a MoS2/MgAl-LDH composite material was constructed using the secondary hydrothermal technique. Characterizations including X-ray diffractometer (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) confirmed the distribution of MoS2nanosheets on the surface of MgAl-LDH. Under full-spectrum irradiation, the degradation efficiency of Rhodamine B reached 85.5%, which was 69.2% higher than that of MgAl-LDH alone. The results from the electrochemical, UV-Vis, and XPS-VB tests indicate that the internal electric field accelerated the separation and transportation of charge carriers between MoS2and MgAl-LDH. These findings demonstrate the great potential of MoS2/MgAl-LDH as a photocatalyst in the degradation of organic dyes, which will aid in the green recycling utilization of magnesium resources from salt lake by-products.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）