ChemCatChem
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2025
·
IF 3.9
Dancheng Zhu,Yuchen Cao,Yuchen Qian,Weijie Yu,Yuxuan Xu,Hao Xu,Jun Qiao,Chao Shen,Jiabin Shen
Graphical This study develops amino-modified Ti 3 C 2 /Mg 3 Al-LDH composites as solid base catalysts for aldol reactions. The composite reduces surface agglomeration, enhances active site exposure, and increases basicity, achieving 99% product yield under optimized conditions (60 °C, 30 min). It retains > 91% efficiency over five cycles, demonstrating superior stability and catalytic performance compared to non-modified LDHs. Aldol reaction is an important class of industrially catalyzed reactions for synthesizing high-value fine chemicals. Traditionally conducted under alkaline conditions, these reactions often utilize liquid alkali catalysts, which present challenges such as difficult separation and recovery and undesirable side reactions promoted by the catalyst. Solid base catalysts have received much attention and research in recent years to address these issues. In this study, magnesium–aluminum layered double hydroxides (MgAl-LDHs) were synthesized using magnesium chloride hexahydrate, aluminum chloride hexahydrate, and anhydrous sodium carbonate. These were subsequently combined with amino-modified Ti 3 C 2 to form composite materials. Characterization of the prepared Mg 3 Al-LDH/Ti 3 C 2 -NH 2 composites was conducted using X-ray diffractometer (XRD), scanning electron microscope (SEM), infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) confirming the successful preparation of the composite material. The prepared Mg 3 Al-LDH/Ti 3 C 2 -NH 2 was applied as a catalyst in the aldol condensation reaction. Key factors such as catalyst dosage, reaction time, acetone amount, and temperature were investigated to optimize catalytic efficiency. Under optimal conditions—100 mg Mg 3 Al-LDH/Ti 3 C 2 -NH 2 , a reaction time of 0.5 h, 200 mg of p -nitrobenzaldehyde, 1 mL of acetone, and a reaction temperature of 60 °C—a yield of 99% was achieved. The result demonstrates that Mg 3 Al-LDH/Ti 3 C 2 -NH 2 exhibits excellent catalytic activity and holds promising potential for application in solid base catalysis.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
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.
研究领域:
材料科学
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电化学
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能源存储与转换
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuan Wei,Mingjie Li,Linlin Li,Wanzhong Feng,Hongyue Wu
Supercapacitors, as advanced electronic devices and energy storage systems for the next generation of electric vehicles, have garnered significant attention owing to their myriad of beneficial attributes. Compared to bimetallic layered double hydroxides (LDH) materials, trimetallic LDH exhibits superior electronic conductivity, faster ion diffusion, and minimal volume variation when employed as supercapacitor electrodes. In this work, the novel NiCoCu-LDH/black phosphorus quantum dots (BPQD) are directly anchored to carbon cloth (CC) using a simple precipitation method combined with hydrothermal technology, along with electrostatic adsorption. Due to abundant active sites, enhanced electron transfer, and stable microstructure, the pseudocapacitance of the prepared CC@NiCoCu-LDH/BPQD is about 1810.6F g −1 (1 A/g). In addition, the assembled asymmetric supercapacitor CC@NiCoCu-LDH/BPQD//activated carbon demonstrates an exceptionally high energy density (202.2Wh kg −1 @800 W kg −1 ) at a satisfactory operating voltage of 1.6 V, along with an extended cycle life, maintaining about 81.4 % capacitance after 10,000 cycles.
研究领域:
材料科学
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能源存储
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Zhimin Li,Guanhui Chen,Shuqi Gou,Xiaofang Deng,Zhongai Hu,Xiaoquan Lu
The quasi-solid-state flexible supercapacitor has been successfully built by freezing-thawing method and in-situ polymerization. The high redox activity nickel-iron layered double hydroxide (NiFe-LDH) provides certain pseudocapacitance, interacts with high conductivity reduced graphene oxide (RGO), and avoids the activity structural collapse and agglomeration. Polyvinyl alcohol (PVA) serves as a flexible framework with uniform cross-linking between the components, facilitated by the presence of abundant hydrogen bonds. Polypyrrole (PPy) is further polymerized in-situ into PVA/RGO/NiFe-LDH to improve its electrochemical performance and flexibility. The PVA/RGO/NiFe-LDH 0.40 /PPy hydrogel electrodes exhibit a high area specific capacitance of 729 mF/cm 2 at 1 mA/cm 2 . The elongation at break of the electrodes is up to 749 %, which reflects excellent tensile properties. The quasi-solid-state flexible supercapacitor has been built using PVA/H 2 SO 4 as the gel electrolyte and PVA/RGO/NiFe-LDH 0.40 /PPy as the electrodes. The device exhibits a high energy density of 15.9 µWh/cm 2 at a power density of 0.19 mW/cm 2 and the capacitance retention of 96.7 % after 10,000 charge-discharge cycles.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ming Li,Xi Chen,Jinjin He,Shucheng Liu,Yi Tang,Xiaogang Wen
Hierarchical NiCo-LDH microspheres (NiCo-LDHM) were synthesized via a simple one-step hydrothermal process in the presence of 2-methylimidazole, and a freeze-drying technique was subsequently used to further adjust its microstructure. The obtained porous hierarchical microspheres are about 5 µm in average diameter, and consist of ultrathin nanosheets with an average thickness of 5 nm. The freeze-drying endows LDH microspheres with higher surface area and improved pore structure . The unique hierarchical porous structure, high specific surface area and positive surface charge together contribute NiCo-LDHM’ excellent capability for anionic dyes and heavy metal ions removal, its theoretical adsorption capacities for Congo red (CR), acid fuchsin (AF) and Cr(VI) are 2120, 1176 and 123 mg/g at room temperature respectively. The adsorption of pollutant molecules/ions onto NiCo-LDH microspheres conforms to the quasi-secondary kinetics model. Isotherm studies suggest that the CR adsorption onto adsorbent fits Langmiur model, while AF/Cr(VI) adsorption fits Freundlich model, indicating that the size and morphology of pollutant molecules influence the adsorption process . The adsorption is a spontaneous endothermic process and NiCo-LDHM demonstrates good recyclability, the removal rates of CR, AF and Cr(VI) can still reach 90.7%, 84.7% and 82% after five cycles, respectively. In addition, NiCo-LDH hierarchical microspheres also exhibit good anionic selective adsorption capacity in mixed-dye systems, displaying great potential for water restoration and dye recycling.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Jiangfu Zheng,Changzheng Fan,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Shuaijun Pan
Photocatalysts based on crystallographic effects and visible light-driven tunable nanostructures have been confirmed as a novel, scalable, and easy-to-implement technology. The hydrothermal reaction serves as the main method of synthesis for its novelty, becoming a viable alternative to other complex physical and chemical processes. In this study, hydrothermal conditions' parameters were set for nanostructured Cu 2 O/ZnAl-LDH photocatalysts. The nanostructured I-scheme Cu 2 O/ZnAl-LDH photocatalysts were prepared with an intercalated morphology. The prepared photocatalysts became the most effective photocatalyst for mineralizing and degrading nitenpyram solution, achieved nearly complete degradation and exceptionally high mineralization values (>40%) after 210 min of reaction, and exerted some ex vivo antibacterial, sterilising effects and potential for treating waste leachate (removal = 78%). The synergistic effect of Cu 2 O/ZnAl-LDH with both crystalline surface effect and intercalation structure can lead to reusability, high stability, versatility, and excellent photocatalytic performance in mineralize neonicotinoid pesticides.
研究领域:
环境科学
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材料科学
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农业科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xujing Ji,Jiayang Zhang,Na Li,Lijing Qiu,Guoqing Zhang,Xinping Duan,Ruixin Wang
Accelerating the electron transfer and thus inhibiting recombination of photogenerated carriers hold paramount significance for photocatalytic solar hydrogen generation. Introducing an intermediate transition layer in the Schottky junction structure would modulate the Schottky barrier and thus enhance the separation efficiency of photogenerated carriers. Herein, we insert an efficient NiCo-layered-double-hydroxide (NiCo-LDH) lamina between molybdenum carbide-supported reduced graphene oxide (Mo2C/rGO, abbreviated as MG) and CdS, fabricating the sandwich composite CdS@NiCo-LDH@Mo2C/rGO (noted as CLMG) for photogenerated hydrogen. The inserted NiCo-LDH enables the dual heterogeneous interface phase of CdS/NiCo-LDH and NiCo-LDH/Mo2C and decreases the Schottky barrier of CdS/Mo2C, boosting the electron transfer of CLMG. In addition, the experiments and DFT calculations indicate that the work functions increase in the order of CdS < NiCo-LDH < Mo2C. Benefiting from the unique nanoarchitecture of the catalyst, the unidirectional cascade electron transport is realized following the order of CdS → NiCo-LDH → Mo2C with NiCo-LDH as an accelerated “electron converter”, which eventually expedites the photogenerated electron transfer of CdS to Mo2C and boosts carrier separation as well as the hydrogen reduction of the integrated system, achieving a 135 times greater H2 production rate (58.07 mmol g–1 h–1) than pristine CdS (0.43 mmol g–1 h–1). Moreover, CLMG exhibits excellent durability.
研究领域:
材料科学
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能源科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
·
IF 2.6
Yan Yue,Wu Wenrui,Tian Xinyu,Wei Chengzhi,Xu Tao,Li Xianfu
Optimizing the performance of layered double hydroxide (LDH) electrodes by MXene is of significant importance for high-performance asymmetric supercapacitors. In this paper, CoAl-LDH nanosheet-doped s-MXene composites were prepared by a facile hydrothermal method, and two-dimensional layered microstructured CoAl-LDH/s-MXene electrode materials with excellent performance were prepared. The homogeneous growth of CoAl-LDH on s-MXene successfully hinders the agglomeration of CoAl-LDH and provides more layered channels for electron and ion transfer across the electrode material. In addition, CoAl-LDH can effectively suppress the stacking of s-MXene, which increases the electrochemical active site of the material, resulting in an increase in specific capacity. The CoAl-LDH/s-MXene electrode material has a high specific capacity of 1259.9 C g −1 at 1 A g −1 , which has outstanding specific capacity and rate capability. The assembled asymmetric CoAl-LDH/s-MXene//AC supercapacitor achieves the desired energy density of 104 and 88 Wh kg −1 at 1500 and 6000 W kg −1 . After 5000 laps at 10 A g −1 , CoAl-LDH/s-MXene//AC has a capacitance retention rate of 86.6% and a coulomb efficiency of nearly 100%, demonstrating its splendid cycling stability. Therefore, this paper adopts a simple hydrothermal method to prepare CoAl-LDH/s-MXene active material, which provides an effective strategy for constructing supercapacitors with excellent performance. Graphical abstract
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·3122
·
IF 5.076
Rao Fu,Yinyan Gong,Can Li,Lengyuan Niu,Xinjuan Liu
The development of highly active and stable photocatalysts, an effective way to remediate environment pollution and alleviate energy shortages, remains a challenging issue. In this work, a CdIn2S4/In(OH)3nanocomposite was deposited in-situ on NiCr-LDH nanosheets by a simple hydrothermal method, and the obtained CdIn2S4/In(OH)3/NiCr-LDH heterostructure photocatalysts with multiple intimate-contact interfaces exhibited better photocatalytic activity. The photocatalytic H2evolution rate of CdIn2S4/In(OH)3/NiCr-LDH increased to 10.9 and 58.7 times that of the counterparts CdIn2S4and NiCr-LDH, respectively. Moreover, the photocatalytic removal efficiency of Cr(VI) increased from 6% for NiCr-LDH and 75% for CdIn2S4to 97% for CdIn2S4/In(OH)3/NiCr-LDH. The enhanced photocatalytic performance was attributed to the formation of multi-interfaces with strong interfacial interactions and staggered band alignments, which offered multiple pathways for carrier migration, thus promoting the separation efficiency of photo-excited electrons and holes. This study demonstrates a facile method to fabricate inexpensive and efficient heterostructure photocatalysts for solving environmental problems.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Gaimei Gao,Mingyu Dou,Xiaojie Liu,Erkang Liu,Zixian Wang,Guang Yang,Hua Yang,Wenning Yang,Dacheng Li,Jianmin Dou
The development of photocatalysts with non-noble metals and the effective separation of photoexcited carriers is a significant strategy for accelerating surface reaction kinetics and promoting water splitting to produce H 2 . Herein, an exquisite core-shell NiFe-LDH@ZnIn 2 S 4 heterojunction photocatalyst was constructed by in situ decoration of ultrathin ZnIn 2 S 4 nanosheets on the surface of the flower-like NiFe-LDH microsphere . The synthesized 3D hierarchical NiFe@ZIS-25 composite exhibits enhanced photocatalytic H 2 evolution activity, reaching 9.12 mmol·h -1 ·g -1 , which is 2.52-fold higher than pure ZnIn 2 S 4 . The significant improvement in H 2 evolution performance could be attributed to the hierarchical core-shell structure of the NiFe@ZIS-25 photocatalyst, which enhanced the light capture ability. In addition, the interfacial coupling effect of ZnIn 2 S 4 and NiFe-LDH is beneficial to the migration of carriers. More importantly, the construction of Z-scheme heterojunction efficiently promotes the fast translation of photogenerated carriers while preserving a stronger reduction potential to achieve H 2 evolution. This work elucidates a rational strategy to develop efficient photocatalysts with hierarchical core-shell structures for water splitting.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Li Dexin,Yao Jianbo,Ren Zhong,Luo Heming,Zhang Jianqiang
The CoMn-LDH/MXene composite was fabricated via hydrothermal synthesis, with nanoscale CoMn-LDH encapsulated on MXene through surface functional groups. This effectively prevents CoMn-LDH aggregation and improves its electrochemical properties. The effects of cobalt-manganese ratio, reaction time, and temperature on the electrochemical properties of CoMn-LDH were explored, as well as the impact of MXene addition on CoMn-LDH composite properties. A comparative analysis of the structural features of pure CoMn-LDH and the composite CoMn-LDH/0.08MXene reveals that the latter exhibits a more pronounced hierarchical structure. Composite CoMn-LDH/0.08MXene has a specific capacity of 1517.8 C-g −1 at a current density of 1 A g −1 , significantly surpassing the 1186.8 C·g⁻1 achieved by pure CoMn-LDH. The asymmetric supercapacitor constructed with this composite material reached an energy density of 48.5 Wh·kg-1 and a power density of 755.3 W·kg −1 , retaining 95% of its capacity after 5000 charge/discharge cycles.The synergistic effect of CoMn-LDH and MXene enhances the capacitance and stability of the CoMn-LDH/0.08MXene composite capacitor. The simplicity of the preparation process, coupled with the excellent performance of the CoMn-LDH/MXene composites, suggests that they have considerable potential for use in advanced energy storage applications.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 10
·4225-4235
·
IF 3.5
Yang Xingchen,Fan Zhitian,Ni Rui,Zheng Long,Lu Haiyan
The original MOFs exhibit poor electrochemical performance when used as electrode materials for supercapacitors. To improve their conductivity and stability, in situ growth of high specific capacitance and conductivity layered double hydroxide (LDH) on the MOFs surface is an ideal approach. In this study, we employed the MOF as a template and employed a secondary hydrothermal synthesis method to enable in situ growth of NiCo-LDH on the surface of the MOF. The utilization of the MOF template enhances the stability of NiCo-LDH, while the flower-like structure of LDH exposes more active sites. By optimizing the Ni:Co molar ratio to 1:2 and the urea:NH 4 F molar ratio to 2:1, the resulting material exhibits higher specific capacitance and improved cycle stability. Specifically, at a current density of 1 A g −1 , the specific capacitance reaches 1674 F g −1 . At a current density of 5 A g −1 , the capacity retention rate after 2000 cycles is 80%. When NiCo-LDH/HKUST-1 is assembled with activated carbon as a supercapacitor, it exhibits a significant energy density of 33.96 Wh kg −1 and a power density of 745.4 W kg −1 . This work provides a novel approach for utilizing MOF-based composite materials as positive electrode materials for supercapacitors. Graphical Abstract
研究领域:
材料科学
·
电化学
·
能量存储
✓ 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）