Catalysis Science & Technology
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2020
·Vol. 10
·期 9
·2931-2947
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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
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能源化学
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表面科学
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DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 7
·e202200184
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IF 9.14
Siyong Ou,Min Zhou,Wen Chen,Yuyao Zhang,Yueli Liu
Graphical Photocatalytic CO 2 reduction : A COF-5/CoAl-layered double hydroxide (LDH) heterojunction photocatalyst is developed for the CO 2 reduction reaction. CoAl-LDH incorporation enhances the visible-light response-ability of the photocatalyst and improves the separation efficiency of photogenerated electron–hole pairs through the role of a type-II heterojunction. Photocatalytic conversion of CO 2 into value-added chemical fuels is an attractive route to mitigate global warming and the energy crisis. Reasonable design of optical properties and electronic behavior of the photocatalyst are essential to improve their catalytic activity. Herein, the 1D/2D heterojunction by direct in-situ synthesis of the covalent organic framework (COF)-5 colloid on the surface of CoAl layered double hydroxide (LDH) was used as the prospective photocatalyst for CO 2 reduction. COF-5/CoAl-LDH nanocomposite achieved 265.4 μmol g −1 of CO with 94.6 % selectivity over CH 4 evolution in 5 h under visible light irradiation, which was 4.8 and 2.3 times higher than those of COF-5 colloid and CoAl-LDH, respectively. The enhanced catalytic activity was derived from the increased visible-light activity and the construction of type II-2 heterojunction, which greatly optimized visible light harvesting and accelerated the efficient separation of the photoinduced holes and electrons. This work paves the way for rational design of heterojunction catalysts in photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
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
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 107
·期 1
·70-82
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IF 2.326
Wang Kai,Liu Shanchi,Yang Mengxue,Jin Zhiliang
CdS and layered double hydroxides (LDHs) have drawn wide attention for photocatalytic water decomposition due to their abundant structure and excellent properties. The construction of a heterogeneous structure is a widely used method for a single material to overcome their narrow spectral light response and inefficient charge separation. In this work, a CdS/CoAl LDH step-scheme (S-scheme) heterojunction photocatalyst was successfully constructed by coupling CdS and CoAl LDH based on the complementary properties of the two materials. Compared with single CdS and CoAl LDH, the prepared CdS/CoAl LDH composite photocatalyst shows excellent photocatalytic hydrogen production efficiency by efficient use of electrons and holes under visible light irradiation. A significant number of electrons in the S-scheme heterojunction photocatalyst can be efficiently used to participate in water splitting while the holes were consumed by the sacrificial reagent. Therefore, the building of the S-scheme heterojunction eventually improved the efficiency of photocatalyst hydrogen production by efficiently separating electrons and holes. At the same time, our work will provide a new approach for the practical application of such semiconductors.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
RSC Advances
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2024
·Vol. 14
·期 14
·10056-10069
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IF 3.9
Fengqin Tang,Hui Bai,Yahui Chen,Chunhui Shi,Dong Wang,Yaju Zhang,Wenyuan Liu,Ling Yang,Libing Hu
The requirement for the removal of phosphorus (P) from wastewater has become progressively stringent, therefore, it is essential to remove low-concentration phosphate from secondary effluents through a tertiary treatment. One of the biggest challenges in removing phosphate from wastewater is the development of low-cost, green, and pollution-free adsorbents. In this study, novel, eco-friendly and low-cost CeO2 nanosphere modifying CoAl-LDH nanosheets (CoAl-LDH/CeO2) were successfully fabricated using a classical hydrothermal strategy. The microstructure and morphology of CoAl LDH/CeO2 were characterized using SEM, TEM, FTIR, XRD, TG, XPS, and BET techniques. The performance of the P adsorption from water for CoAl-LDH/CeO2 was investigated. The influences of adsorption parameters, such as adsorbent dosage, pH, phosphate concentration, adsorption time, and experimental temperature, were investigated through batch adsorption experiments. The batch adsorption experiments showed that the P removal by CoAl-LDH/CeO2 could reach 93.4% at room temperature within 60 minutes. CoAl-LDH/CeO2 showed ultrafast and high-efficiency adsorption for low concentration P contaminated wastewater. Pseudo-second order model exhibited better fitting with the kinetics of the phosphate adsorption, while the Freundlich model well-described the isotherm results (R2 > 0.999). Although Cl−, NO3−and SO42− coexisted in the solution, CoAl-LDH/CeO2 still possessed favourable selectivity for phosphates. More importantly, the adsorption capacities of CoAl-LDH/CeO2 retained over 85% after five cycles. Therefore, the low cost and sustainable utilization of CoAl-LDH/CeO2 for the phosphate removal from secondary effluent with phosphate at a low concentration highlights its potential application to alleviate eutrophication.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
DESALINATION
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2025
·
IF 9.8
Yi Lu,Xiang Wang,Xiaofeng Xu,Pan Wu,Zongze Li,Guangyao Zhang
The increasing global demand for freshwater and clean energy necessitates innovative solutions that address both resource scarcity and environmental challenges. Herein, we present a 2D sandwich-like hybrid membrane, composed of bacterial cellulose (BC) and calcined CoAl-LDH nanosheets (CAL-T), fabricated via a layer-by-layer deposition strategy. This multifunctional membrane synergistically integrates photothermal evaporation and photocatalytic CO 2 reduction, leveraging the porous structure and narrow bandgap (1.37 eV) of CAL-T to enhance solar absorption and energy conversion. Furthermore, the BC matrix facilitates efficient water transport and mechanical stability, ensuring long-term operational performance. Under 1 kW ∙ m −2 solar irradiance, the BC/CAL-650 membrane achieves a water evaporation rate of 1.36 kg ∙ m −2 ∙ h −1 , surpassing most reported 2D evaporators, and a CO evolution rate of 8.78 μmol ∙ g −1 ∙ h −1 , significantly outperforming conventional photocatalysts. Furthermore, the BC matrix facilitates efficient water transport and mechanical robustness, ensuring long-term operational performance. These dual-functional capabilities, coupled with low-cost fabrication (~$0.0041 per membrane), demonstrate the membrane's superiority and practical potential in integrated solar-driven water purification and solar-to-fuel conversion. This work establishes a versatile platform for advancing next-generation hybrid materials to mitigate water scarcity and climate change challenges.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·994-1005
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IF 7.779
Linfen Peng,Changqiang Yu,Yuheng Ma,Guanshun Xie,Xiuqiang Xie,Zhenjun Wu,Nan Zhang
Transition metal chalcogenides (TMCs) have been well-established as ideal low-dimensional systems for photocatalytic hydrogen evolution. Strategies toward improving the activity of these TMC photocatalysts by crafting heterostructures have been intensively studied. In this study, a two-dimensional (2D) CoAl layered double hydroxide (CoAl-LDH) has been assembled on 2D TMCs (CdIn2S4, In2S3, and ZnIn2S4) to construct novel 2D/2D heterostructures by a facile electrostatic assembly method. The intimate interaction at the interface of hybrids and the suitable energy level alignment enable an efficient pathway for electron transfer to improve the photoactivity. Experimental results show that the photocatalytic activity of the CdIn2S4@CoAl-LDH hybrids for H2 production is about 4.3 times higher than that of CdIn2S4 nanosheets under visible-light irradiation. The effect of 2D CoAl-LDH on enhancing the photoactivities of In2S3 and ZnIn2S4 by similarly constructing 2D heterostructures has also been determined. This work establishes a foundation to construct 2D TMC-based heterostructures using CoAl-LDH nanosheets toward enhanced photoredox activity.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Lanyu Qi,Guofeng Ma,Ronghui Kou,Ziyao Wang,Hongling Zhang,Yanhong Yang
The Fenton-like process is a highly efficient and widely applied advanced oxidation technology for degrading organic pollutants under dark conditions. However, its development is limited by low H 2 O 2 utilization, incomplete mineralization, and limited optimal pH range. We developed a CoAl-LDH/porous g-C 3 N 4 catalyst via high-temperature thermal polymerization with NH 4 HCO 3 as a dynamic gas template and urea as a precursor. The reaction rate constant of CoAl-LDH/porous g-C 3 N 4 -H 2 O 2 system for degradation of Rhodamine B is 0.0199 min −1 , which is about 1.58 times that of the CoAl-LDH-H 2 O 2 system. Moreover, the catalyst sustained performance over four cycles and maintained high activity in degrading three different substrates. The high catalytic activity is attributed to the rich porous structure of g-C 3 N 4 , the presence of abundant active sites, and the synergistic interaction between the CoAl-LDH and g-C 3 N 4 , which promotes the generation of ·OH, 1 O 2 , ·O 2 − , facilitating pollutant degradation. This study highlights the potential of this CoAl-LDH/porous g-C 3 N 4 -based Fenton-like system for applications in dye wastewater treatment.
研究领域:
环境科学
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催化材料
·
废水处理
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jinghao Hua,Changchang Ma,Dayu Wu,Haitao Huang,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian,Sheng Feng
In this study, a novel Z-scheme Bi 19 S 27 Br 3 /CoAl-LDH heterojunction was prepared. An interface charge transfer channel was established between Bi 19 S 27 Br 3 and CoAl-LDH, accelerating the transition efficiency of interface electrons from CoAl-LDH to Bi 19 S 27 Br 3 . Thereby ensuring more excited electrons to participate in CO 2 photoreduction reactions. The reduction products were tested under artificial light conditions, and triethanolamine was selected as a sacrificial agent. After 5 h of illumination, the CO yield of Bi 19 S 27 Br 3 /CoAl-LDH Z-scheme heterojunction was 86.41 μmol·g −1 is 4 times and 7 times higher than Bi 19 S 27 Br 3 and CoAl-LDH, respectively. The yield of CH 4 in Bi 19 S 27 Br 3 /CoAl-LDH is 3.97 μmol·g −1 is 4 times higher than CoAl-LDH. Also Bi 19 S 27 Br 3 itself does not produce CH 4 . The results indicate that the Z-scheme heterojunction effectively enhances the photoreduction ability of CO 2 , providing a new approach for accurately controlling the direction of photo generated charge separation to prepare high-performance photocatalysts.
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
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Lin Sun,Yu Liu,Ming Yan,Weijing Liu,Xiaoying Liu,Weidong Shi
Reasonable structures are beneficial to improve the electronic transfer efficiency of the electrode. A novel two/three-dimensional structure with multiphase CoSe 2 (M-CoSe 2 ) nanoboxes fixed on CoAl-LDH nanoflowers on carbon paper (CP) is reasonably designed. The formation mechanism of M-CoSe 2 is systematically studied through the gradient change of the selenization conditions. Benefitting from the hollow structure of the ZIFs derivatives (carbon-nitrogen frameworks, CNFs), numerous charge transfer channels are provided. Furthermore, M-CoSe 2 with enhanced conductivity can furnish abundant active sites and a synergistic effect. The specific capacity of the optimal anode M-CoSe 2 /CNFs/CoAl-LDO/CP can reach 343.6 mAh g −1 at 1 A g −1 , which is equivalent to twice that of the monomer material. The hybrid-supercapacitor (M-CoSe 2 /CNFs/CoAl-LDO/CP//activated carbon) can provide a high energy density of 50.8 Wh kg −1 at 800 W kg −1 , and high stability (capacity loss rate of 3.2%, 10,000 cycles). Besides, LEDs can be lit by HSCs, demonstrating their application potential.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yue Yan,Wenrui Wu,Yang Yang,Tao Xu,Xianfu Li
The rational collocation and construction of multiphase composite electrode materials with ingenious structures is a key strategic to enhance the electrochemical performance of supercapacitors (SCs). Within this project, a unique Co9S8@CoAl-LDH/NF core–shell heterostructure consisting of CoAl-LDH/NF ultrathin nanosheets sturdily attached to Co9S8/NF needle-like nanorods is grown in situ on self-supported conductive substrate nickel foam (NF) by an effortless and productive multistep hydrothermal method. The construction of the core–shell structure can effectively enhance the capacitive properties as well as the mechanical strength of the material. Compared with the single-component materials Co9S8/NF (1769.6 mF cm–2 and 91.6%) and CoAl-LDH/NF (858 mF cm–2 and 85.2%), the Co9S8@CoAl-LDH/NF composites have excellent capacitance properties (5052.4 mF cm–2) along with exceptional capacitance retention (5000 cycles) 98.5% even after undergoing charging and discharging. Furthermore, the asymmetric SCs fabricated with Co9S8@CoAl-LDH/NF and AC/NF exhibit an energy density of 0.17 mWh cm–2 at 3.20 mW cm–2. Therefore, the innovative core–shell heterostructure of Co9S8@CoAl-LDH/NF presented in this study holds immense practical potential as a groundbreaking electrode material in the realm of SCs.
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
FUEL
·
2023
·
IF 7.4
Junnan Tao,Mingyuan Wang,Xiangzhao Zhang,Lei Lu,Hua Tang,Qinqin Liu,Shuangying Lei,Guanjun Qiao,Guiwu Liu
Energy band matching coupled with intimate interface in a heterojunction is the prerequisite for achieving the separation of photogenerated carriers. Herein, 0D CdS nanospheres were uniformly anchored in 3D flower-like CoAl layered double hydroxide (CoAl-LDH) spheres via a hydrothermal process. The unique porous structure and abundant hydrophilic groups can significantly promote the interactions between catalyst and solutions and thus facilitate the photocatalytic reaction. The appropriately staggered band structures can trigger the formation of S-scheme heterojunction, and the tight connection between the CdS and CoAl-LDH offers more charge transport channels, thereby accelerating the charge transfer. The optimized CdS/CoAl-LDH nanohybrid presents a photocatalytic hydrogen evolution of 6.19 mmol/g/h and tetracycline hydrochloride (TC) degradation efficiency of 92.2 % in 50 min. Moreover, the Cd 2+ ion concentration measured by ICP-OES verifies the alleviation of photocorrosion, and the DFT calculations further demonstrate the higher hydrophilia, lower H 2 absorption energy and stronger charge interactions of CdS/LDH hybrid. This work provides a feasible strategy to efficiently utilize the photoinduced carries by constructing a highly hydrophilic S-scheme heterojunction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 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）