JOURNAL OF CATALYSIS
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2022
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IF 8.047
Shudi Yu,Jin Li,Hui Zhang
A series of hierarchically structured hybrids Ni x Mg 3-x Al-LDH/rGO (LDH: layered double hydroxides, x = 1, 1.5 and 2, rGO: reduced graphene oxide) supported atomically precise Au n ( n = 25, 38 and 127) nanoclusters (NCs) catalysts Au n /Ni x Mg 3-x Al-280 were firstly prepared via a double pH-controlled electrostatic adsorption method using captopril-capped Au n NCs as precursors followed proper calcination . Detailed characterizations show that the as-obtained hierarchically structured Au n NCs catalysts possess the nanosheet array-like structure formed by the LDHs nanosheets (∼55–70 × 10 nm) interdigitated vertically grown on the both sides of rGO layers, and Au n NCs with size of 1.0–1.9 nm are mainly dispersed on the edge and cross-linking sites of LDH/rGO hybrid. All the hierarchically structured Au n NCs catalysts exhibit excellent catalytic activity for the solvent-free oxidation of benzyl alcohol without additional base, and the activities show a volcanic trend with increasing Ni/Mg ratios and gradually decrease with the increased Au atomicities in Au n clusters. The highest TOF value of 5118 h −1 for the Au 25 /Ni 1.5 Mg 1.5 Al-280 can be ascribed to the smallest Au 25 NCs containing the Au 0 /Au δ+ -Ni 2+ /Mg 2+ –OH interface with the highest Au δ+ /(Au 0 + Au δ+ ) ratio, and the strongest Au 25 −LDH/rGO synergistic interaction along with hierarchical nanosheet array-like structure facilitating the transmission and diffusion of the reactants. The present work provides a new idea for preparing the hierarchically structured LDH/rGO hybrid supported metal nanoclusters catalysts with high-performance for various catalytic applications.
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Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Mengdie Xu,Jia Wei,Xiujuan Chen,Guoping Pan,Jiamei Li,Luyi Xing,Yifei Zhang,Yanan Li,Zhaoxu Wang,Jun Li
The ubiquitous and ineffective treatment of antibiotics in aquatic systems leads to serious environmental problems, threatening ecology and human health. Herein, layered double metal hydroxides (LDH) and biochar (BC) were successfully combined through a facile hydrothermal method to prepare a novel pH-universal electric Fenton (EF) cathode (MnFe-LDH@BC). The developed MnFe-LDH@BC-EF system exhibited superior performance in the degradation of tetracycline (TC) (94.2%) than both of MnFe-LDH-EF (64.1%) and BC-EF system (67.0%) and showed a well-pleasing performance in a wide pH range. It was proposed that the nanostructures of LDH favored the multivalent cycle of Fe and Mn, promoting the electron transfer of BC as well as the release of Fe 2+ , leading to continuously generation of extensive free radicals and non-radicals. The co-existing ions (Cl - , NO 3 - , CO 3 2- , HCO 3 - and H 2 PO 4 - ) had different impact on the removal of TC. The studied system exhibited satisfactory degradation of various selected contaminants as well as fantastic stability in successive cycles. The possible degradation pathways were proposed and the toxicity of intermediate products were assessed by the Estimation Program Interface (EPI) Suite analysis. This work demonstrated the great potential of the developed cathode in water treatment area and provided insights into the utilization of biomass waste resources.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chenying Zhang,Long Zhang,Qu Liu,Yinxuan Ding,Lingli Cheng,Minghong Wu,Zhen Li
Nickel–cobalt layered double hydroxides (NiCo-LDHs) are highly promising materials for energy storage electrodes. However, the poor conductivity and easy agglomeration limit their practical application. Herein, the novel hollow nanocage architecture of NiCo-LDH nanosheets (H-NiCo-LDH) decorated N-doped graphene quantum dots (N-GQDs) is constructed using zeolitic imidazolate framework-67 (ZIF-67) as self-sacrificed template. The hollow nanocage structure suppresses the agglomeration of nanosheets and enlarges the electrochemical interface, while the decoration of N-GQDs effectively improves electrical conductivity and provides more abundant active sites. More importantly, HRTEM characterization shows the construction of heterojunctions between H-NiCo-LDH and N-GQDs, and the interfacial charge redistribution through p-n heterojunction promotes interfacial electron transfer and enhances redox activity. Consequently, the N-GQD/H-NiCo-LDH electrode delivers a high specific capacitance of 2347 F g −1 (326 mA h g −1 ) at 1 A g −1 with excellent rate performance (82% capacitance retention at 10 A g −1 ). The assembled asymmetric supercapacitor by N-GQD/H-NiCo-LDH and active carbon exhibits an energy density of 52.1 W h kg −1 at a power density of 770 W kg −1 with remarkable cycling stability (80.5% capacitance retention after 5000 cycles). The hollow nanocage structure and enhanced electrical conductivity of N-GQDs make the N-GQD/H-NiCo-LDH a highly promising material for electrochemical energy storage applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ruili Li,Guoqing Xiao,Chunlin Chen,Chunyan Chen,Shuyi Shang,Yuanyuan Li,Zhengwei Yang,Qian Liu
Textile wastewater pollution with dyes has become a major source of water pollution. In the study, GO and composite nanospheres (CNS@LDH and HOTiO 2 ) were used to form the composite materials by electrostatic self-assembly method, and the composite materials vacuum filtration on the surface of CA membrane to prepare the composite membranes for dyes separation. Among them, GO was used as a vertical separation layer in dyes separation, while the hollow structure of HOTiO 2 nanosphere with a large specific surface area provided more adsorption sites, and the CNS@LDH nanosphere with core–shell structure played the role of expanding GO sheets and preventing HOTiO 2 from collapsing. Compared with the GO membrane, the water flux of three dyes produced by GO/HOTiO 2 /CNS@LDH composite membrane increased by 18 times with a rejection rate of 99%. In addition, after 10 cycles of experiments, GO/HOTiO 2 /CNS@LDH composite membrane retained a rejection rate of over 98% with the flux of 79 L∙m −2 ∙h −1 ∙bar −1 for MB. GO/HOTiO 2 /CNS@LDH composite membrane retained a stable rejection rate on three dyes under extreme pH and ionic strength conditions. The composite membrane combined the adsorption and isolation effects of GO, HOTiO 2 , and CNS@LDH, which significantly enhanced the separation performance of dye wastewater. Accordingly, the GO/HOTiO 2 /CNS@LDH composite membrane has great potential in practical wastewater treatment.
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FIBERS AND POLYMERS
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2023
·Vol. 24
·期 6
·1951-1961
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IF 2.5
Shi Shengnan,Feng Shuangjiang,Liu Chenghuan,He Man,Bu Xiaohai,Zhang Zewu,Zhou Yuming,Yao Qingzhao
Passive radiant cooling (PRC) technology has an irreplaceable position in building cooling and energy conservation due to sustainable and environmental friendly without energy consumption. However, the lack of consideration for building security in extreme weather conditions, especially in hot and overheated conditions, which propose a requirements for synergistic design of fire resistance and optical selectivity of materials. Herein, this work propose to introduce the compound (PAC) originated from phytic acid (PA) and cytosine (C) and the LDH nanosheets modified by ammonium polyphosphate (APP) into porous cellulose acetate (CA) film to obtain synergistically functionalized 2D/3D cellulose LDH photonic films (CPA films). The presence of substantial amounts of P elements effectively enhances the fire resistance of films, so that it burns without an open flame and with excellent self-extinguishing. Furthermore, the P=O and P−O in APP and PAC endows CPA films with outstanding atmospheric window emissivity via selective absorption, whose infrared emissivity is 93.68%. Meanwhile, the modified dispersive LDH increases solar radiation reflectivity to 96.15%. As a verification, building models covered with films are constructed, cooling of 6℃ be achieved and average energy saving efficiency is 22.8% through shading roof merely. Looking forward to the future, the CPA films will get a comprehensive application in buildings, 5G communication base stations, spacecraft and all equipment exposed to solar. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yihua Cao,Zhi Li,Xueli Yin,Yonghao Gan,Ying Ye,Run Cai,Qi Wang,Bo Feng,Xiaoping Dai,Weiyu Song
The development of low-cost and high-efficiency electrocatalysts for the oxygen evolution reaction (OER) is essential to produce high-purity hydrogen in large scale. Herein, a three-dimensional (3D) seaweed-like hierarchical structure was fabricated using two-dimensional (2D) NiMn LDH nanosheets wrapped on one-dimensional (1D) NiSe nanowires with nickel foam (NF) as a substrate (NiSe@NiMn LDH/NF) via hydrothermal and electrodeposition processes. Owing to the strong interfacial synergy, 3D seaweed-like hierarchical structure, higher conductivity, and strong structural stability, the NiSe@NiMn LDH/NF exhibited superior OER performance with an overpotential of 287 mV at 100 mA cm −2 , and stably operated for 160 h at large current. Moreover, the overall water splitting system with NiSe@NiMn LDH/NF as the anode and Pt/C/NF as the cathode exhibited a low cell voltage of 1.59/1.64 V to reach 50/100 mA cm −2 , and excellent stability for 110 h at 300 mA cm −2 . The density function theory (DFT) calculations unveiled that NiSe@NiMn LDH enabled the interfacial synergy, reallocating the electron density at the interface, and further weakening the energy barrier of OH* by strengthening chemical bonds with OH* intermediates to improve the intrinsic OER activity.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Chenxi Tang,Tengfei Bao,Shuming Li,Xiuyan Wang,Heng Rao,Ping She,Jun-sheng Qin
Metal sulfides have attracted extensive attention in photocatalysis , but are limited by the high combination rate of photo-induced charges due to their bulky structures. Herein, a bioinspired three-dimensional (3D) penetrating structured micro-mesoporous Z-scheme heterojunction of NiCoFe-layered double hydroxides@ZnIn 2 S 4 (NiCoFe-LDH@ZIS) with S vacancies was constructed. The NiCoFe-LDH@ZIS heterojunction was prepared by limiting the growth of ZIS through intercalating flower-like ZIS within dandelion-like LDH. The obtained NiCoFe-LDH@ZIS demonstrated a superior photocatalytic H 2 evolution (PHE) rate (113.57 mmol g −1 h −1 ) and 97.78 % conversion rate of benzylamine oxidation, simultaneously. This superior photocatalytic performance benefits from the enhanced charge separation induced by the combination of 3D penetrating micro-mesoporous structure, the introduction of S vacancies, and Z-scheme heterojunction. This dimensional-matched 3D penetrating porous heterojunction affords more abundant active sites, accelerated separation of photogenerated carriers, and reduced activation energy of H 2 evolution. This unique structure provides a feasible reference for bi-functional photocatalytic reactions.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2023
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IF 3.8
Guoxin Ding,Chenfeng Sun,Meiyi Wang,Guojun Cheng,Jun Liu,Yuexiang Hu
The construction of multihollow lightweight wave absorbing materials is a future goal. Layered double hydroxides (LDHs) offer a great potential for electromagnetic wave absorption given their lamellar texture and tunable bimetallic composition. In this study, CoFe–LDH was grown on 4,4'-diaminodiphenylmethane-modified reduce graphene oxide (RGO) surfaces through a hydrothermal method, and composites with different morphologies and wave-absorbing properties were obtained at varying molar ratios of Fe to Co in CoFe–LDH. When Fe: Co=5:5, CoFe–LDH flakes grew uniformly on the RGO surface, and the composite exhibited an excellent microwave absorption performance with a minimum reflection loss of –60.0 dB and effective absorption bandwidth (EAB) of 4.4 GHz. When Fe: Co=3:7, the composite can obtain a maximum EAB of 5.12 GHz at a matched thickness of 1.82 mm.
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yuan He,Chengwei Sun,Shidong Fang,Muhammad Shaban,Changlun Chen
Layered double hydroxides (LDHs) have been served as potential pseudo-capacitive materials, especially for high-performance supercapacitors. However, the characteristics like limited capacitance, poor conductivity, and stability of LDHs severely confine their extensive applications for future energy-storage devices. It is urgent to seek a new and simple method to modify LDH materials, to improve its electrochemical performance and apply it to supercapacitors. Herein, a facile in-situ non-thermal plasma (NTP) treatment is conducted to modify NiCo-LDH nanowires for better electrochemical performance, resulting from the introduction of N-doping and oxygen vacancies by N 2 NTP. All these instructive synergies provide the optimum electrode (P-NiCoNW/CC-150) after the NTP treatment under the power of 150 W with outstanding capacitance performance of 4320 mF/cm 2 at 2 mA/cm 2 , and superior cycling stability along with capacitance retention of 117.3 %. Most importantly, an asymmetric supercapacitor device is assembled, employing P-NiCoNW/CC-150 and oxidized carbon cloth as cathode and anode electrodes respectively, exhibiting a particularly high energy density of 364 μWh/cm 2 when the power density is 4505 μW/cm 2 . This work confirms a feasible and green NTP method to synthesize high-performance electrodes for practical applications in future energy-storage devices but not limited to supercapacitors.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongli Yang,Huilin Hou,Man Yang,Zhongli Zhu,Hui Fu,Dongdong Zhang,Yong Luo,Weiyou Yang
The selective photoreduction of CO 2 into hydrocarbon fuels, such as CH 4 , is highly desirable for sustainable energy but remains a significant challenge due to slow proton-electron transfer processes and competing intermediates. Herein, a novel NiO/MgAl-LDH (NMA-x, LDH represents layered double hydroxide) step-scheme (S-scheme) heterojunction has been engineered via in-situ anchoring MgAl-LDH nanoplates on metal–organic frameworks (MOFs) derived NiO microrods, which improves the CO 2 adsorption capability and specific surface area of NiO. The steered internal electric field in the p-n heterointerface promotes charge separation and attracts a high electron density center on the catalyst surface to favor CH 4 production. Meanwhile, S-scheme photogenerated charge transfer mechanism is proposed by in-situ X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectra and density functional theory (DFT) calculation. In this process, photogenerated electrons are transferred from the conduction band (CB) of MgAl-LDH to the valence band (VB) of NiO, facilitating the CHO* species serve as the critical intermediate for producing CH 4 through desired photocatalytic CO 2 reduction. Using pure water as a proton source, the NMA-2 catalyst achieved a high CH 4 selectivity of 91.2% and a yield of 8.98 μmol∙g −1 ∙h −1 , representing significant potential for practical applications. This catalyst outperformed pristine and revitalized NiO by 4.23 and 2.07 times, respectively.
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Small
·
2023
·
IF 13.3
Zhongqi Lu,Kai Zhao,Hanwen Guo,Lejiao Duan,Huiru Sun,Kuiyong Chen,Jingquan Liu
Active compounds based on LDH (ternary layered double hydroxide) are considered the perfect supercapacitor electrode materials on account of their superior electrochemical qualities and distinct structural characteristics, and flexible supercapacitors are an ideal option as an energy source for wearable electronics. However, the prevalent aggregation effect of LDH materials results in significantly compromised actual specific capacitance, which limits its broad practical applications. In this research, a 3D eggshell-like interconnected porous carbon (IPC) framework with confinement and isolation capability is designed and synthesized by using glucose as the carbon source to disperse the LDH active material and enhance the conductivity of the composite material. Second, by constructing NiCoMn-LDH nanocage structure based on ZIF-67 (zeolitic imidazolate framework-67) at the nanometer scale the obtained IPC/NiCoMn-LDH electrode material can expose more active sites, which allows to achieve excellent specific capacitance (2236 F g −1 / 310.6 mAh g −1 at 1 A g −1 ), good rate as well as the desired cycle stability (85.9% of the initial capacitance upon 5000 cycles test). The constructed IPC/NiCoMn-LDH//IPC ASC (asymmetric supercapacitor) exhibits superior capacitive property (135 F g −1 /60.1 mAh g −1 at 0.5 A g −1 ) as well as desired energy density (40 Wh kg −1 at 800 W kg −1 ).
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Manlin Zhu,Wangfeng Cai,Hongbo Wang,Leqiu He,Yan Wang
A morphologically adjustable metal-organic framework (MOF) template and a unique hierarchical structure show improved electrochemical performance of electrode materials for supercapacitors . Herein, Zn/Co-MOF-derived zinc-cobalt oxide/nickel cobalt layered double hydroxides (Zn-Co-O/NiCo-LDH) hierarchical core/shell nanostructures on nickel foam (NF) were synthesized by simple methods and exhibited high specific capacitance. The results showed that both the reasonable morphology of the MOF-templated continuous nanosheet network and synergy between transition bimetallic oxides and transition bimetallic hydroxide played an important role in improving the electrochemical properties . Hence, the as-prepared Zn-Co-O/NiCo-LDH battery-type electrode exhibited excellent specific capacitance of 2275.2 F/g at 1 A/g and remarkable cycling stability of 82.4% capacitance retention after 5000 cycles. Moreover, the as-prepared Zn-Co-O/NiCo-LDH was used as the positive electrode to assemble a hybrid supercapacitor (HSC) device, which attained a distinguished energy density of 44.5 W h/kg at a power density of 800 W/kg and satisfactory stability (71.5% retention after 5000 cycles). It was concluded that MOF-templated core/shell heterostructures in electrode materials have broad prospects and great potential for energy storage.
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