CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Feng Du,Jingsha Li,Changhong Wang,Jixin Yao,Zixuan Tan,Zhikun Yao,Changming Li,Chunxian Guo
Electrochemical nitrate reduction to ammonia (NRA) has attracted increasing attention recently, as it can not only eliminate the harmful nitrate in water, but also produce high value-added ammonia in ambient conditions. Noble metals such as Ru, Pd, Pt, etc., show good activity for NRA but the high price and scarcity restrict their practical applications. Therefore, to develop efficient non-noble metal-based catalysts towards NRA is of great significance. In this contribution, CoFe layered double hydroxide (CoFe LDH) is demonstrated as an efficient non-noble electrocatalyst for NRA. Specifically, NH 3 selectivity and Faradaic efficiency of CoFe LDH in alkaline conditions are up to 98.93% and 97.68%, respectively. CoFe LDH also maintains good operation durability during 12 consecutive recycling tests (36 h). It is found that there is strong electronic interaction between Co and Fe species, which accelerates reaction kinetics of CoFe LHD. Density functional theory calculations also suggest that CoFe LDH can favorably promote the adsorption of intermediates (NO 3 – and NO 2 – ) and desorption of NH 3 , eventually achieving efficient and selective NH 3 production.
研究领域:
电化学
·
催化材料
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·
IF 3.3
Qing Zhong,Xiaozhang Song,Jingyi Wang,Wenhui Yu,Ruifen Tian,Yinling Wang
The present study focuses on the electrochemical-mechanical (ECM) coupling effects of a thin-film, solid-state battery with only stiff, ceramic materials, in contrast to prior investigations that focus on individual active material particles or aggregations of particles. We model the impacts of ECM couplings including stress-transport and stress-equilibrium potential on the full-cell performance and potential mechanical failure modes of a thin-film battery conformally deposited in a nanopore scaffold, which is an experimentally achievable device. Model results indicate electrode volume changes due to lithium insertion or removal, along with mechanical boundary conditions, result in stress gradients that alter the lithium-ion flux, reduce lithium concentration gradients, and improve cell rate capability. However, the high stress levels in the cell can also lead to mechanics-related failure such as the separation of cell layers. For the parameter set in this work, stress-transport coupling has a much greater influence on rate capability than stress-potential coupling. Optimization of thin-film batteries to harness the benefits of ECM effects requires leveraging geometric design and material selection. The current work underscores the need for further theoretical and experimental investigation into ECM effects in thin-film batteries to enhance their understanding and design optimization.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Jian Tang,Junxian Hu,Xuanli Chen,Bin Yang,Keyu Zhang,Yin Li,Yaochun Yao,Shaoze Zhang
The development of economically feasible and efficient bifunctional electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in electrochemical water splitting for hydrogen generation is highly significant. Here, the OER and HER activities on CoFe LDH are enhanced by coupling CeCO 3 OH to construct heterostructures and doping Ce atoms. The results reveal strong electronic interactions at the heterointerface, leading to the generation of abundant oxygen vacancies (OVs). Ce doping induces lattice distortion in CoFe LDH leading to a large number of defects and simultaneously leading to changes in the morphology of the layer. Benefiting from their synergistic effects, the prepared CeCO 3 OH/Ce-CoFe LDH heterostructure exhibits excellent OER and HER performance with low overpotentials of 216 mV and 165 mV at 10 mA cm −2 respectively in alkaline media. Moreover, it demonstrates robust stability (OER: 94 h at 100 mA cm −2 ) in 1.0 M KOH electrolyte. When employed as both the anode and cathode catalyst, it demonstrates good stability for 77 h. This work provides a new perspective on the design of LDH-based bifunctional catalysts for overall 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
LANGMUIR
·
2024
·
IF 3.7
Ze Qiu,Yingzhangyang Liu,Wencai Cheng,Congcong Ding
In this research, we focus our attention on the leaching peculiarity of uranium-containing Mg–Al layered double hydroxide (LDH) which is one kind of waste sediment in uranium tailings, generated by the alkalinization of uranyl raffinate. The effect of inorganic (CO32–, SO42–, PO43–) and organic (C2O42–, C6H6O72–, C6H16O24P62–) anions were investigated. Atomic force microscopy result showed that the thickness of CO32–-LDH increased to 8.6 nm compared to original LDH whose thickness was 6.7 nm. Compared with the control sample (5.58 μm), the grain size with C6H16O24P62– anion grew to 7.04 μm. A large amount of CO32– can stay in LDH, up to 1.78 mol percent, while the C6H16O24P62– anion was only 0.41 mol percent. X-ray diffraction results showed that the anions could change the crystal structure of LDH, especially the C6H18O24P6 anion, and theoretical calculation also conformed this result. The leaching tests showed that the introduction of anions improved the leaching efficiency of UO22+ from LDH. The introduction of anions destroyed the super buffer property of LDH. Theoretical calculation results indicated that the anions could grab UO22+ and help the UO22+ escape from the LDH. This research gave guidance for long-term disposal of uranium-containing tailings.
研究领域:
环境科学
·
放射性废物管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemNanoMat
·
2024
·
IF 2.6
Yi Jiang,Chenglun Tang,Yilun Wu,Yishen Zhu
One of the main goals of present vaccine investigations is to develop a potent and efficient adjuvant strategy. The combination of multiple agonists to different pattern recognition receptor families offers great opportunities to achieve strong immune responses in a synergy manner. Here, we employed layered double hydroxide nanomaterials with BSA coating (LB) to integrate CpG and 3pRNA dual adjuvant cocktail, together with ovalbumin antigen. With LB loading, CpG and 3pRNA led to a quick internalization and enhanced induction of dendritic cell (DC) maturation. Meanwhile, this nanoadjuvant cocktail facilitated antigen crosspresenting in activated DCs. Taken together, these results may inspire the investigation of agonists combination and LDH-based nanoadjuvants.
研究领域:
免疫学
·
纳米医学
·
疫苗研究
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hanhan Huang,Caifeng Xia,Derui Liang,Yuan Xie,Fanping Kong,Jinxiu Fu,Zhiwen Dou,Qinghua Yang,Wenjing Suo,Qian Zhang,Zilin Meng
Novel biotite (Bt) supported different amounts of Mg-Al layered double hydroxide (LDH@Bt) with a three-dimensional hierarchical structure was fabricated via in-situ growth method. The structural and morphology characterization indicate that LDHs stably and uniformly dispersed on Bt surface, but excessive LDHs still lead to obvious aggregation of LDHs. The removal performance of LDH@Bt for heavy metal of Cu 2+ /Pb 2+ and pesticides of glyphosate (GLY)/2-methyl-4-chlorophenoxyacetic acid (MCP) in soil was investigated, and the removal rates of LDH@Bt composite for four contaminants were higher than those of LDHs and Bt. Intraparticle diffusion and pseudo-second-order model well described the kinetics of heavy metals and pesticides removal. Adsorption isotherm data of Cu 2+ and Pb 2+ yielded better accordance of Freundlich model, while data of GLY and MCP were fitted Langmuir model well. In addition, different adsorption mechanisms for removal of Cu 2+ /Pb 2+ by precipitation and removal of GLY/MCP by surface adsorption were proposed. The application performance and recovery ability of LDH@Bt composite in soil were evaluated by column leaching experiments and magnetic collectability tests. The excellent removal performance and magnetic collectability provided a promising strategy for remediation and elimination of heavy metals and pesticides contaminations from soil.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shixia Chen,Yifeng Huang,Xinxin Han,Zeliang Wu,Cen Lai,Jun Wang,Qiang Deng,Zheling Zeng,Shuguang Deng
Layered double hydroxides (LDHs) are currently attracting intense research interests as pollutant adsorbent due to its low cost, non-toxicity, structure amenability and anion exchange capability. Herein, 3-dimensional (3D) flower-like Ni/Al LDH were prepared to decorate H 3 PO 4 activated biomass-derived porous carbons (PAB) via a facile and green hydrothermal method. The as-synthesized nanocomposites (Ni/Al@PAB) displayed favorable removal performance towards both Cr(VI) and methyl orange (MO) from aqueous solution due to the inherited excellent Cr(VI) removal ability from PAB and MO removal ability from Ni/Al LDH. In single-component removal system, the maximum adsorption capacity of 271.5 and 412.8 mg/g for Cr(VI) and MO were achieved on Ni/Al@PAB, respectively. Remarkably, the removal capacity of Cr(VI) and MO both increased in the Cr(VI) MO binary system due to the synergistic effect including, (i) additional adsorption sites of N-containing groups from MO, (ii) electrostatic interactions by the reduced Cr(III), and (iii) mutual thermal compensation in the binary system. This work paved the way for designing novel LDHs-decorated porous carbon adsorbents and revealed that the acicular Ni/Al LDH decorated PAB could be applied as efficient and simultaneous adsorbent for coexisting toxic pollutants situations.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wenlan Ji,Yijiang He,Tian C. Zhang,Yuan Wang,Shaojun Yuan
The novel non-noble metal anodes of Ni-based (Co 2+ , Fe 2+ , and Mn 2+) layered double hydroxides (Ni-based LDH) were uniformly anchored on the carbon cloth (CC) surface (denoted as Ni-based LDHs/CC) by a simple, rapid and universal electrodeposition approach. The low-cost NiCo-LDH/CC anodes not only possessed superior conductivity and more exposed reactive sites, but also delivered promising electrocatalytic oxidation ability. Notably, the electrocatalytic oxidation efficiency of the obtained NiCo-LDH/CC and NiMn-LDH/CC anodes were positively correlated with the deposition amount of NiCo-LDH and NiMn-LDH, wherein NiCo-LDH-180s/CC anode delivered a significant enhancement in electrocatalytic oxidation efficiency of As(III), over 4.7 times higher than that of pure CC. Impressively, the NiCo-LDH-180s/CC anode exhibited larger electrochemical active areas and outstanding electrocatalytic activity, and can achieve nearly 100% conversion efficiency within 20 min at a current density of 6 mA/cm 2 . In particular, the developed anode is also distinguished by its adaptability to different pH values and its strong immunity to coexisting ions, which is expected to be widely applied in various As(III)-contaminated environments. Electron spin resonance spectra fully validated the formation of free radicals (•OH and •O 2 − ) with strong oxidative properties, and was employed to further investigate the associated reaction mechanism in combination with quenching experiments. This work potentially offers an in-depth perspective of electrocatalytic technology for the decontamination of highly toxic As(III) wastewater through cost-effective non-noble metal anodes and broadens the scope of electrocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 11
·1320
·
IF 2.654
Hanjun Wu,Huali Zhang,Qingxue Yang,Dongsheng Wang,Weijun Zhang,Xiaofang Yang
In this work, calcined chitosan-supported layered double hydroxides (CSLDO) were synthesized through a co-precipitation method that restrained the particles’ aggregation of LDHs and exhibited huge specific surface areas, which can enhance the fluoride adsorption capacity. CSLDOs were characterized by physical and chemical methods and used for fluoride adsorption in an aqueous solution. The results indicated that the nanoparticles were constructed first and then assembled to form a porous and layered structure, and chitosan-supported layered double hydroxides (CSLDHs) calcined at 400 °C (CSLDO400) showed the highest specific surface area of 116.98 m2·g−1and the largest pore volume of 0.411 cm3·g−1. CSLDO400 exhibited excellent adsorption performance at a wide pH range from 5 to 9 for fluoride. The adsorption kinetics indicated that the adsorption reached equilibrium after 120 min, and followed a pseudo-first-order model. It agreed well with the Langmuir isotherm with maximum adsorption amounts of 27.56 mg·g−1. The adsorption of fluoride ions was spontaneous and endothermic. Furthermore, CSLDO400 showed a high stability for fluoride removal; it could still achieve 68% removal for fluoride after repeating five times of adsorption–desorption cycles. This study demonstrated that CSLDO400 is a promising functional material to remove fluoride from surface/ground water.Keywords:chitosan;layered double hydroxides;adsorption;fluoride removal;regeneration
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
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Liang Li,Junhao Yang,Liuqiang Li,Yuanxing Huang,Junkai Zhao
The application of electrocatalytic reduction of CO 2 is limited by the low solubility of CO 2 in water, separation of products, energy conversion efficiency and insufficient catalyst performance. In this research, enhanced CO 2 reduction was observed in alcohol amine solution by using layered double hydroxides (LDHs) intercalated with gold or copper. Copper was found to be distributed more evenly and thus had a larger electrochemical active surface area (ECSA) through the pre-intercalation of EDTA when compared with the direct ion-exchange of [AuCl 4 ] − with LDHs. In 0.5 M KHCO 3 solutions, CO and H 2 was monitored for Au/MgAl-LDHs while additional products of CH 4 and HCOOH was measured by using Cu/MgAl-LDHs. In 1.0 M alcohol amine solutions, CO and H 2 were determined as the main products for both Au/MgAl-LDHs and Cu/MgAl-LDHs. Under all the test conditions hydrogen evolution reaction (HER) was enhanced towards negative potential, resulting in a higher Faraday's Efficiency (FE) for H 2 .
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 4
·725
·
IF 4.967
Huali Zhang,Lingzi Jin,Hanjun Wu,Zhenyue Zhang,Junxia Yu,Wenjun Zhang,Yi Pan,Zhiquan Pan
Phosphate tailings (PTs) are solid waste, which is produced by phosphate flotation. In this work, PTs were used as raw materials for the preparation of diethylenetriamine pentamethronic acid (DTPMP) intercalated trimetal (Ca-Mg-Al) layered double hydroxides (TM-DTPMP LDHs) by co-precipitation method. TM-DTPMP LDHs were characterized by X-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy, differential thermal gravimetric analysis, X-ray photoelectron spectroscopy and applied as a flame retardant to improve the fire safety of epoxy resin (EP). The results showed that the composite materials exhibited obvious layered structure. After intercalation, layer spacing increased from 0.783 to 1.78 Å. When the amount of TM-DTPMP LDH in EP was 8%, the limitted oxygen index of the composite material increased from the original 19.2% to 30.2%. In addition, Cone calorimeter (CC) and Raman spectrum results indicated that with the addition of TM-DTPMP LDHs, the value of heat release rate peak (pHRR) and total heat release (THR) were reduced by more than 43% and 60%, while the value of smoke formation rate (pSPR) and the total smoke production (TSP) decreased nearly 64% and 83%, respectively. The significant reduction in the release of combustion heat and harmful smoke during EP combustion may be attributed to the synergistic flame-retardant effect between hydrotalcite and DTPMP. This work exhibited great potential for the green recycling of PTs and the enhancement of the fire safety of EP.Keywords:phosphate tailings;layered double hydroxides;epoxy resin;fire safety
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Bianyang He,Yao Xiao,Yanfang Li,Mingjie Fu,Jianying Yu,Lei Zhu
Bitumen could emerge the degradation of performance under ultraviolet (UV) light easily, then the bituminous pavement would have to be repaired and even reconstructed for safety, causing environmental pollution and energy consumption. Therefore, it is crucial to raise bituminous anti-UV aging property so that the service life of bitumen could be increased memorably, which is beneficial to environmental protection and sustainable development. Lignin grafted layered double hydroxides (LG-g-LDHs) were prepared successfully through covalent bonding with diphenyl-methane-diisocyanate (MDI), and were characterized by Fourier transform infrared (FTIR) spectrometer, scanning electron microscopy (SEM) contact angle tester and ultraviolet and visible (UV–vis) spectroscopy. Then LG-g-LDHs were used for modifying bitumen, the effects on anti-UV aging properties were researched by physical properties, four components analysis, FTIR and dynamic shear rheometer (DSR) test. The results showed that LG-g-LDHs were prepared and represented a stable cross-linked structure, then they had a combined effect of chemically absorbing and physically reflecting UV light owing to the multi-layered and benzene ring structure. Due to the introduction of lignin, the compatibility between LDHs and bitumen could be improved. After aging, the properties including physical properties and rheological behaviors of bitumen decreased and colloidal stability declined. Compared with LDH, LG-g-LDHs represented better inhibitory action in performance deterioration and colloidal stability of bitumen, which indicated that LG-g-LDHs could strengthen bituminous anti-UV aging properties for sustainable service of bitumen.
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）