Journal of Energy Storage
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2024
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IF 8.9
Shaopei Yang,Yuhang Jia,Hongzhang Cao,Quan Li,Yujia Guo,Yongqi Mi,Jiajun He,Pengcheng Du
Layered double hydroxides (LDHs) show great advantage in supercapacitors (SCs) due to their unique layered structure and high theoretical capacity. However, their poor electrical conductivity and structural instability hinder their practical application. Metal-organic framework materials (MOFs) can be utilized to construct transition metal derived materials with adjustable morphology and high electrochemical properties . In this study, we first synthesized flower-like NiCo-based MOFs (NiCo-BTC) using a one-step solvothermal reaction. The formation process followed a sequence of “nucleation-growth-etching” corresponding to Ostwald's maturation theory. Subsequently, novel hierarchical NiCo-LDHs micro-flowers were constructed through treating the NiCo-BTC in an alkaline solution. The morphology of NiCo-LDHs was optimized by adjusting the ratio of Ni to Co, so as to achieve excellent electrochemical properties due to the hierarchical flower-like structure and the bimetallic synergistic effect. As a result, Ni 3 Co 1 -LDH exhibited a high specific capacitance of 1978.2 F/g at 1 A/g, excellent rate capability of 82.80 % at 40 A/g and good cycle stability with 70.6 % capacitance retention after 10,000 cycles at a high current density of 10 A/g. Furthermore, the asymmetric SC (ASC) based on Ni 3 Co 1 -LDH//AC exhibited high specific capacitance of 162.4 F/g at 1 A/g and excellent energy density of 54.8 Wh/kg at power density of 779.4 W/kg. In addition, the ASC demonstrated remarkable cycle stability with a capacitance retention of 96.5 % after 3500 cycles. The successful synthesis of 3D hierarchical NiCo-LDHs micro-flowers offers an effective approach to developing highly promising electrodes for SCs.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yuxuan Zhu,Jing Qian,Ke Xu,Wanru Ouyang,Juan Yang,Nianjun Yang
Monitoring salivary glucose has gained increased attention as a non-invasive approach to prevent and diagnose diabetes. Since the glucose concentration in saliva is lower than that in blood, the development of effective electrocatalysts for highly sensitive glucose detection is thus of great significance. In this study, a hollow nanocage from NiCo-layered double hydroxides (LDH) modified with multi-walled carbon nanotubes (MWCNTs) is designed and further employed as the sensing material to construct a novel non-enzymatic glucose electrochemical sensor with high sensitivity. It is synthesized by utilizing pre-synthesized zeolitic imidazolate framework (ZIF-67)/MWCNTs as a sacrificial template and subsequently conducting a simple solvent-thermal reaction with Ni(NO 3 ) 2 . Such a hollow nanocage preserves the polyhedral framework structure of the used precursor, where the hollow frame-like structure of NiCo-LDH offers accessible catalytic sites, and MWCNTs provides good conductivity. Their combination brings in a bridging effect between MWCNTs and NiCo-LDH, further leading to a large electrochemical active area and excellent catalytic activity of this hollow nanocage. The constructed sensor exhibits a detection limit as low as 0.03 μM for the glucose detection as well as wide linear ranges of 0.1–3000 μM and 3000–9231.8 μM, corresponding to the sensitivity of 2.55 and 1.15 μA mM −1 cm −2 , respectively. Moreover, this sensor enables the tracking of glucose concentration change in salivary before and after food intake. This work offers new highly sensitive sensing materials and potentially valuable approaches for non-invasive glucose detection.
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Journal of Water Process Engineering
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2025
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IF 6.7
Yue Su,Chun Wang,Ju Wang,Yunqi Liu,Haibo Chang,Mingxue Li,Haichao Zhao
The labyrinth effect of graphene coatings could extend the diffusion path of corrosive media. However, the poor compatibility between graphene and resins and the low loading capacity of graphene affect its functional application. By combining the in-situ synthesis and electrostatic interaction, layered double hydroxides (LDH) were grown on the graphene surface, L-aspartic acid anions (Asp) were adsorbed on LDH by electrostatic interactions. The loading capacity of L-aspartic acid was up to 40.5 wt%. The barrier property of nanohybrid coatings was measured by electrochemical workstation, it was found that the rGO-LDH-Asp/epoxy coating exhibited the best corrosion protection properties, and the coating resistance could still be maintained at 1.231 × 10 9 Ω⋅cm 2 after being immersed in 3.5 wt% NaCl solution for 90 days. The anticorrosion mechanism of the coating was explored through local electrochemical impedance spectroscopy, L-aspartic acid anions adsorbed on the surface of rGO-LDH could accelerate the passivation of the metal substrate and delay the corrosion process.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Junchang Liu,Weijie Yuan,Minghui Zhu,Sivarasan Ganesan,Nikolai Ivanovich Vatin,Dafeng Zhang,Xue-Yang Ji,Xipeng Pu,Xinghui Liu
The widespread application of antibiotics, such as tetracycline (TC), has led to severe environmental problems. Herein, the rod-like Mn 0.3 Cd 0.7 S (MCS) coupled with flower-like FeNi 8 -LDH self-assembled from nanosheets S-scheme heterojunction is successfully constructed by a simple physical ultrasonic-assisted combined with a grinding method. The optimized MCS/30FeNi 8 -LDH heterojunction exhibits excellent photocatalytic degradation of TC under visible light with a removal rate of 72.5 % within 30 min along with excellent cycling stability, which enhanced 14.5 and 1.68 times compared to those of pristine FeNi 8 -LDH and MCS. The correlation between S-scheme heterojunction and photocatalysis performance clarify the rapidly transfer pathway of photogenerated carriers between MCS and FeNi 8 -LDH. The trapping experiment confirms •O 2 - and h + are the primary active species, with h + playing a dominant role in the degradation process. The enhanced photocatalytic degradation performance can be attributed to the formation of S-scheme heterojunction with well-matched band alignment, which remains the powerful reduction capability of generated electrons of FeNi 8 -LDH and more robust oxidation capability of photogenerated holes of MCS. This work not only provides a potential solution for photocatalysis degrading TC, but also expands the S-scheme heterojunction constructed strategy to the realm of energy storage and conversion .
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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.
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ACS Sustainable Chemistry & Engineering
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2024
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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.
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FUEL
·
2024
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IF 6.7
Jin Zhang,Mengting Gao,Ruiyi Wang,Xincheng Li,Jie Wang,Shiye Li,Kemeng Cao,Jiao Li,Yunwei Wang,Zhanfeng Zheng
The research on the strong interaction between metal and vacancy has made new progress. Herein, we report the bifunctional role of oxygen vacancies on in situ synthesis of Au nanoparticles photocatalyst and selective hydrogenation of α, β-unsaturated aldehydes. Due to the memory effect of layered double hydroxide (LDH), LDH after high temperature calcination could restore its original layered structure and introduce a large number of oxygen vacancies. In the process of catalyst synthesis, Au 3+ was in situ reduced to Au nanoparticle over LDH with the help of oxygen vacancies with special electronic environment. A 99 % conversion of cinnamaldehyde and 97 % selectivity for cinnamyl alcohol was obtained over Au/LDH-700 in the selective hydrogenation of cinnamaldehyde under visible light irradiation without bases addition. This high performance was attributed to the synergistic effect between the localized surface plasmon resonance (LSPR) effect of Au nanoparticles and the abundant oxygen vacancies in LDH. The Au nanoparticles absorb visible light to induce the dehydrogenation of isopropanol and provide stable hydrogen source for the hydrogenation reaction. The LDH rich in oxygen vacancies selectively adsorbs the –C O group of cinnamaldehyde via the terminal oxygen mode to ensure the formation of highly selective cinnamyl alcohols. In addition, experimental data shows Au/LDH-700 catalyst could hydrogenate a variety of α, β-unsaturated aldehydes and ketones into corresponding unsaturated alcohols with high conversion and selectivity. Our work points out a new direction for the selective hydrogenation of α, β-unsaturated aldehydes to unsaturated alcohols.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Zhe Zhang,Juping Wang,Maria Serdechnova,Valeryia Kasneryk,Zheng Zhang,Carsten Blawert,Hao Wang,Mikhail L. Zheludkevich,Fei Chen,You Zhang
A novel inhibitor-loaded bilayer hybrid system based on the LDH inner layer and MOF outer layer is designed on an aluminum alloy 2A12 surface to improve corrosion performance. The hybrid film system covers the inherent cavities and intercrystalline defects of the LDH film using the affinity between the LDH and the MOF compounds. The results demonstrate that the LDH-inhI precursor film is entirely covered by new Zn-based MOF microrods. The LDH-inhI precursor film is partially dissolved and recrystallized in favor of MOF crystal growth to strengthen the binding adhesion between LDH and MOF films. The LDH-inhI/MOF-inhII bilayer film shows significantly enhanced corrosion resistance through the synergistic action of LDH and MOF nanocontainers doped with different corrosion inhibitors (vanadates, 2,5-furandicarboxylic acid, and benzotriazoles). Due to the multiple loadings of the MOF film and the sustained-release of the LDH film, this method provides an effective approach to developing new anticorrosion systems and enhancing both the barrier ability and active corrosion protection performance of LDH-based conversion treatments.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jinyao Zheng,Zongjia Li,Juan Qin,Yuanhao Zhang,Xinyue Guo,Xiue Jiang,Miaomiao Zhang,Jilin Tang
The emergence of drug-resistant bacteria has rendered traditional antibiotics ineffective, posing a serious threat to human health. There is an urgent need to find alternative antimicrobial agents. Inspired by enzyme immobilization and multi-enzyme biocatalysis, we have designed a tri-metal layered double hydroxide (LDHs)-based cascade catalytic system (CoCuFe-LDH@Gox nanosheets) for treating drug-resistant bacterial infections and promoting wound healing. The synergistic effects of the Co, Cu, and Fe in the tri-metal LDHs structure endow CoCuFe-LDH nanosheets with excellent peroxidase (POD)-like activity. The large specific surface area of CoCuFe-LDH nanosheets render them ideal carriers for glucose oxidase (Gox). CoCuFe-LDH@Gox nanosheets can catalyze glucose to produce gluconic acid and H 2 O 2 . The generated gluconic acid decreases the local pH, further enhancing the POD-like activity of CoCuFe-LDH@Gox nanosheets at wound site. CoCuFe-LDH@Gox nanosheets can then catalyze H 2 O 2 generating hydroxyl radicals (•OH) to effectively kill drug-resistant bacteria. This synergistic integration of the catalytic LDHs and the Gox components enables the cascade catalytic system to be highly effective against drug-resistant bacteria. In addition to its remarkable antibacterial properties, this LDHs-based system also exhibits excellent biocompatibility and considerable immunomodulatory capabilities. It can accelerate the healing of drug-resistant bacteria-infected wounds by inhibiting the inflammatory response and regulating macrophage polarization. These multifunctional attributes make the CoCuFe-LDH@Gox nanosheets a highly promising candidate for the treatment of drug-resistant bacterial infections in future clinical applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Ruiyu Fu,Jiawei Liu,Yongpeng Ma,Hongbo Li,Xiaoqin Hai,Jiaxiao Niu,Xiaoli Guo,Xin Di
Tetracyclines (TCs) residues pose a significant threat to the aquatic environment and human health, therefore this study aims to develop a simple, rapid, and sensitive TCs detection method. Herein, a dual-responsive gel probe (LDH-CES@N) was designed, consisting of the intercalation of graphene quantum dots into europium-doped layered double hydroxide (LDH). In the presence of TCs, the as-prepared probe exhibited dual emission fluorescence at 504 nm and 616 nm due to the synergistic effect of aggregation-induced emission and antenna effect. Meanwhile, the density functional theory was employed to validate the mechanism underlying TC-induced electron transfer from graphene quantum dots. The dual-signal response fluorescence probe has excellent detection ability of oxytetracycline, including a wide detection range (0–60 μM), low detection limit (0.145 μM), and rapid response time (120 s). Furthermore, combined with the smartphone, a portable and real-time detection platform was established for the visual detection of oxytetracycline in tap water and honey samples with desirable recovery rates (97.8 %-105.4 %). Therefore, this work provides a new strategy for fluorescence detection of trace pollutants, demonstrating considerable practical application potential.
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APPLIED ENERGY
·
2024
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IF 10.1
Miao Sun,Yanan Wang,Jaka Sunarso,Xiuxia Meng,Weimin Zhang,Jun Cao,Naitao Yang
Layered nickel‑cobalt double hydroxide (NiCo-LDH) with a high theoretical charge storage capacity has great potential to be used as a supercapacitor (SC) electrode. However, its low electronic conductivity, low stability, and aggregation tendency has been recognized as the main drawbacks. Herein, solvent-induced interfacial-confined process was used to synthesize an unusual brush-like heterostructure of NiCo-LDH vertically anchored on conductive MXene nanosheets, enabled by the solvent-induced effect of the polar hydroxyl group of ethylene glycol and the limited domain effect of MXene nanosheets. This unique brush-like structure promoted mass transfer and improves charge transport behaviours compared to the pure NiCo-LDHs. The resultant NiCo-LDH@MXene had an ideal larger peak pore size of 3.8 nm and BET specific surface area of 175.13 m 2 g −1 compared to those of NiCo-LDH, which facilitates the exposure of active sites and mass transfer. In three-electrode configuration, NiCo-LDH@MXene provided a significant specific capacity of 1310 F g −1 at a 1 A g −1 current density. At a power density of 699.1 W kg −1 , NiCo-LDH@MXene showcased a substantial energy density of 73.8 Wh kg −1 in a symmetric supercapacitor. At a 6 A g −1 current density, NiCo-LDH@MXene-based SC could retain 92.5% of its capacitance at the end of 10,000 charge and discharge cycles, underscoring its excellent stability in practical application. Electrochemical tests and DFT simulation further revealed enhanced ionic adsorption/transport and electron transport, more enriched active sites, and altered electrical configuration on account of the lower energy barrier for NiCo-LDH@MXene relative to NiCo-LDH. The synthesis route and the insights reported here pave a way toward advanced electrode design and development.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Mengke Li,Yang Yang,Yajie Zhang,XinZhuo Liu,Yulan Li,Xiaobin Niu
NiFe-layered double hydroxides (NiFe LDHs) are regarded as outstanding electrocatalysts for the oxygen evolution reaction (OER), but the inherent charge transport limitations hinder their practical application. Herein, we developed a 3D hierarchical α-Co(OH) 2 /NiFe LDH/NF composite catalyst via a simple electrodeposition-hydrothermal method. The introduction of α-Co(OH) 2 enables interfacial electron modulation with NiFe LDH, driving electron transfer from Ni/Co sites to Fe centers via multi-pathway coupling channels (Ni–O–Fe, Ni–O–Co, Co–O–Fe). This electron redistribution creates an optimized coordination environment that promotes the formation of high-valence Ni and Co species, subsequently facilitating the in situ formation of highly active phases (γ-NiFeOOH and CoOOH) during the OER process. The derived γ-NiFeOOH provides superior intrinsic activity, while the coexisting. CoOOH significantly enhances charge transport due to its high electronic conductivity. As a result, the composite achieves an overpotential of only 285 mV at a current density of 500 mA cm −2 , outperforming both NiFe LDH (372 mV) and α-Co(OH) 2 (441 mV). Additionally, this catalyst shows an excellent long-term stability at 100 mA cm −2 for 120 h. This work demonstrates that interfacial electronic modulation offers a strategy for designing efficient and durable OER catalysts capable of operating at industrial current densities.
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