MOLECULES
·
2025
·Vol. 30
·期 1
·180
·
IF 4.6
Xiaojing Si,Yue Huang,Mei Han,Liqiang Luo
Dihydromyricetin (DMY), as the main active ingredient inAmpelopsis grossedentata, is a naturally occurring flavonoid that has attracted extensive attention for its multiple biological activities. For the quick and accurate measurement of DMY, a novel electrochemical sensor based on a glassy carbon electrode (GCE) modified with a cobalt metal-organic framework (Co-MOF) was proposed in this work. The Co-MOF was synthesized via a single-step hydrothermal process using Co(NO3)2·6H2O. Fourier infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were used to study the morphology and structure of the synthesized Co-MOF. Utilizing differential pulse voltammetry and cyclic voltammetry methods, the effectiveness of DMY electro-oxidation on the Co-MOF/GCE was examined. The results showed that, in comparison to the bare GCE, the electro-oxidation peak current of DMY was considerably increased by the Co-MOF/GCE. The detection limit was 0.07 μM, and the peak current demonstrated two linear relationships in the ranges of 0.2−20 μM and 20−100 μM, with the linear equations of Ip (μA) = 0.4729c (μM) + 1.0822 (R2= 0.9913) and Ip (μA) = 0.0939c (μM) + 8.4178 (R2= 0.9971), respectively. The average DMY content inAmpelopsis grossedentatasamples was measured to be 3.275 μM, with a good recovery of 108.27% and a relative standard deviation value of 3.46%. The proposed method is simple, rapid and sensitive and can be used for the determination of DMY inAmpelopsis grossedentata.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kaiting Chen,Xinyu Han,Qian Wang,Kaijie Liu,Xiangguang Yang,Yibo Zhang
The selective catalytic reduction of NO by CO (CO-SCR) presents an economical and promising approach to mitigate emissions of NO x and CO from motor vehicles. A bimetallic Rh-Mn supported catalyst Rh-Mn/CoAlO was synthesized through the reduction of citric acid and ethylene glycol, and subsequently employed in the CO-SCR reaction. Tests assessing its catalytic performance revealed that the Rh-Mn/CoAlO catalyst displayed superior CO-SCR activity, maintaining high efficiency (≥90 % at 230 °C) and stability while simultaneously reducing the usage of noble metals. Various characterization techniques, including H 2 -TPR, NO-TPD, CO-pulse, and XPS, indicated that the Rh-Mn/CoAlO catalyst possessed enhanced dispersion of noble metals. This increased dispersion ensured optimal contact between Rh and Mn, as well as the support, fostering a synergistic interaction that facilitated electron transfer. Consequently, the catalyst’s adsorption and activation capabilities for NO were significantly improved. In situ DRIFTs studies further elucidated that the catalyst primarily followed the E-R mechanism, wherein NO is adsorbed onto the catalyst surface, and subsequently, the N and O atoms generated from pyrolysis react with CO in the gas phase. The findings of this study are anticipated to offer an effective strategy for designing catalysts with exceptional low-temperature activity and high dispersibility for the reduction of NO using CO.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zan Zhang,Meng Zhang,Gaojie Yan,Mengke Li,Haifeng Ji,Yi Feng,Xiongwei Qu,Xiuli Hu,Xiaojie Zhang
The performance of Li-S batteries based on multiphase and multi-electron transfer mechanisms is highly dependent on the redox kinetics of sulfur. However, the slow redox kinetics of the endogenous redox mediator lithium polysulfides hinders the preparation of high-performance Li-S batteries. In this work, two functional polyurea binders (PUSe and PUS) were synthesized, which possess diselenide or disulfide modules. PUSe and PUS binders can not only limit the shuttling effect of polysulfides by abundant urea groups effectively, but also give the sulfur cathode excellent mechanical properties by introducing intermolecular hydrogen-bonding networks and diselenide and disulfide modules. More significantly, selenium-selenium and sulfur-sulfur modules have been considered as redox co-mediators to accelerate the redox process of sulfur cathode. Li-S batteries involved with PUSe and PUS as binders show excellent electrochemical performance, while significantly accelerating the redox kinetic process, the initial discharge specific capacity of the cell with PUSe as binder was as high as 963.1 mAh/g and 856.7 mAh/g after 500 cycles at 1C; the capacity decay rate is only 0.022% per cycle.
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Materials Today Physics
·
2024
·
IF 10
Biao Zhang,Liming Quan,Zhihong Luo,Qiantong Li,Jianming Deng,Shuhang Yu,Wangxin Li,Mingmei Lin,Feng Yan,Dawei Wang,Dongyan Yu,Changbai Long,Laijun Liu
CaBi 2 Nb 2 O 9 (CBNO) ceramics exhibit significant potential in the development of piezoelectric sensors suitable for extreme environments such as aerospace, metallurgy, and nuclear power plants. While previous studies have enhanced the piezoelectric response of CBNO ceramics, their insulating properties at high temperatures still require improvement. In this work, co-substitution of (Li 0.5 Bi 0.5 ) at A site and Mn at B site was designed to improve the electrical properties of CBNO ceramics. Defect dipoles induced by the bound between Mn and oxygen vacancies restrict the movement of oxygen vacancies at high temperatures. Meanwhile, co-substitution of Ca by (Li 0.5 Bi 0.5 ) reduces both the sintering temperature and volatilization of Bi 2 O 3 during the sintering process. This modification results in an ultra-high T C of 928 °C and an exceptional resistivity of 2.85 MΩ cm at 600 °C for Ca 0.96 (Li 0.5 Bi 0.5 ) 0.04 Bi 2 Nb 1.98 Mn 0.02 O 9 ceramics. Furthermore, the ceramic exhibits excellent piezoelectric properties ( d 33 of 15.2 pC/N and k p of 6.9 %), ferroelectric properties ( P r of 9.42 μC/cm 2 ), and thermal stability (degeneration of d 33 only 6 % after annealing at 900 °C for 2 h). This work offers a practical strategy for simultaneously achieving both a high piezoelectric response and outstanding insulating properties in the CBNO system.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongyuan Chuai,Haibei Yang,Sheng Zhang
Ni single-atom-decorated nitrogen-doped carbon materials (Ni–Nx-C) have demonstrated high efficiency in the electrochemical reduction of CO2 (CO2RR) to CO. In this study, Ni–Nx-C active sites were embedded within a carbon membrane via an electrospinning and pyrolysis process. The resulting self-supported carbon membrane hosting Ni–Nx-C sites could be directly utilized as an electrode for the CO2RR. To enhance the CO2RR performance of the carbon membrane, the porous structure of the carbon membrane was fine-tuned by incorporating a pore-forming agent. The optimized porous carbon membrane electrode, K0.66-Ni-NC, achieved an impressive CO faradaic efficiency (FECO) of over 90% within a wide potential range from −0.8 to −1.6 V vs RHE for CO2RR. Additionally, it maintained an FECO of above 90% at −0.8 V vs RHE throughout a 30 h durability test in an H-cell. Further analysis has revealed that the porous structure of the carbon membrane not only facilitates the mass transport of CO2 but also increases the level of exposure of active sites during the CO2RR.
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高影响因子
CARBON
·
2024
·
IF 10.5
Jia Xu,Zheng Ma,Piaoping Yang,Chunling Zhu,Yujin Chen
With the rapid development of communication technology and the widespread use of high-frequency equipment, electromagnetic interference and irradiation have become increasingly serious, posing risks to human health and the operation of electronic devices. In this work, the 3D hierarchically ordered porous carbon frameworks with magnetic Co nanoparticles (Co–OPCs) are synthesized using the template-assisted method and a pyrolysis process to address these challenges. By adjusting the pyrolysis temperatures, the average size of Co nanoparticles in Co–OPCs ranged from 12.4 to 44.7 nm. The optimal Co–OPCs exhibited stronger electron transfer capability, stronger interface polarization loss of abundant Co/C heterogeneous interfaces, more dipole polarization loss ability from carbon defects and N-doping sites, multiple reflections contributed by the unique hollow structural characteristics and excellent impedance matching degree balanced by dielectric-magnetic loss. Consequently, the optimal Co-OPC sample's minimum reflection loss (RLmin) can reach −43.19 dB at a thickness of 1.70 mm and an effective absorption bandwidth (EAB) up to 6.86 GHz at a thickness of 2.00 mm. This work aims to clarify the electromagnetic loss mechanism of 3D hierarchically ordered porous carbon framework with magnetic nanoparticles and provide an effective method for designing and manufacturing lightweight, high-performance carbon-based absorbers.
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Catalysis Science & Technology
·
2024
·
IF 4.4
Xuewei Tu,Can Sun,Yang Hu,Yutong Chen,Shouxin Zhu,Jingyi Qu,Zhexiao Zhu,Xiang Zhang,Hui Zheng
Cycloaddition of CO2 and epoxides to synthesize cyclic carbonates via photothermal catalysis represents one of the effective strategies for achieving carbon neutrality. In this study, a facile one-step hydrothermal method was employed to synthesize a bimetallic photothermal catalyst FeCo@BPDC. This catalyst demonstrates remarkable efficiency in fixing CO2 to synthesize cyclic carbonates under atmospheric pressure and solvent-free conditions. Through comprehensive characterization and experimentation, the indispensability of bimetallic active sites has been convincingly demonstrated. Additionally, the incorporation of organic ligands significantly enhances the concentration of oxygen vacancies within the catalyst, thereby endowing it with excellent photocatalytic performance. This study presents a novel perspective for the design of photothermal catalysts that convert CO2 into value-added chemicals under mild conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yujie Xie,Bianyong Lian,Shuqi Deng,Qingqu Lin,Kaili Wang,Yun Zheng,Zewen Zhuang,Yao Liu,Kaian Sun,Wei Yan,Jiujun Zhang
CO and H 2 S poisoning of Pt-based catalysts for hydrogen oxidation reaction (HOR) stands as one of the long-standing hindrances to the widespread commercialization of proton exchange membrane fuel cells. In this paper, a Ru/Ti 4 O 7 catalyst is successfully synthesized by the microwave-thermal method. This Ru/Ti 4 O 7 catalyst shows a much higher noble metal mass activity than those of commercial PtRu/C and conventional Ru/C catalysts. The performance of the Ru/Ti 4 O 7 catalyst under the exist of CO or H 2 S shows insignificant current decay, which is far superior to commercial PtRu/C and Pt/C catalysts. In this Ru/Ti 4 O 7 catalyst, the electron transfer between Ru and Ti to form d-p orbital hybridization is considered to be responsible for the favorable catalytic HOR performance and the corresponding CO and H 2 S tolerance. The interaction mechanism formed by electron transfer may open a promising way for the subsequent development of anti-poisoning catalysts for PEM fuel cell hydrogen oxidation reaction.
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Journal of Energy Storage
·
2024
·
IF 8.9
Zhu-yu Li,Sheng Li,Le-ran Li,Qi Niu,Kai Li,Bin Hu,Qiang Lu
Thermochemical energy storage can overcome the drawbacks such as instantaneity, instability, and the incongruity between supply- and demand-side in the utilization of renewable energy. CaCO 3 /CaO is regarded as a promising material for thermochemical energy storage, whereas its stability still requires urgent improvement. In this paper, a new Al 2 O 3 and SiO 2 co-doped calcium-based material derived from eggshell (ES) was prepared for efficient heat storage. The physicochemical properties of synthesized materials were systematically analyzed. The regulation mechanisms of Al 2 O 3 and SiO 2 additions on the cyclic characteristics of heat storage materials were investigated by a thermogravimetric analyzer. The results displayed that ESCa-2.5Si2.5Al, prepared with a mass ratio of ES: Al 2 O 3 : SiO 2 = 95: 2.5: 2.5, demonstrated outstanding specific surface area of 14.64 m 2 /g and pore volume of 0.080 cm 3 /g, which were 2.74 and 5 times greater than those of ES-based CaO (ESCa), respectively. Meanwhile, SiO 2 and Al 2 O 3 could react with CaO to form Ca 3 Al 2 O 6 and Ca 2 SiO 4 , their synergistic effect could efficiently improve the sintering resistance of CaO. Therefore, ESCa-2.5Si2.5Al possessed excellent cyclic stability. Its initial energy storage density was 2273.19 kJ/kg, and the retention ratio reached 72.93 % after 20 cycles, significantly higher than that of ESCa (19.35 %). In addition, compared with ESCa, the heat storage temperature of ESCa-2.5Si2.5Al decreased from 792 °C to 778 °C, and its carbonation rate only slightly attenuated over 20 cycles, enabling rapid heat storage at lower temperatures and stable heat release.
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ACS Nano
·
2024
·
IF 15.8
Sen Jin,Zuhao Shi,Ruige Wang,Yitong Guo,Libo Wang,Qianku Hu,Kai Liu,Neng Li,Aiguo Zhou
Highly active and low-cost co-catalysts have a positive effect on the enhancement of solar H2 production. Here, we employ two-dimensional (2D) MBene as a noble-metal-free co-catalyst to boost semiconductor for photocatalytic H2 production. MoB MBene is a 2D nanoboride, which is directly made from MoAlB by a facile hydrothermal etching and manual scraping off process. The as-synthesized MoB MBene with purity >95 wt % is treated by ultrasonic cell pulverization to obtain ultrathin 2D MoB MBene nanosheets (∼0.61 nm) and integrated with CdS via an electrostatic interaction strategy. The CdS/MoB composites exhibit an ultrahigh photocatalytic H2 production activity of 16,892 μmol g–1 h–1 under visible light, surpassing that of pure CdS by an exciting factor of ≈1135%. Theoretical calculations and various measurements account for the high performance in terms of Gibbs free energy, work functions, and photoelectrochemical properties. This work discovers the huge potential of these promising 2D MBene family materials as high-efficiency and low-cost co-catalysts for photocatalytic H2 production.
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高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 27
·期 1
·133-143
·
IF 9.3
Hongjiao Chen,Kewei Zhang,Yanzhi Xia,Jian Li,Bin Hui
Coupling the urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) in seawater is desirable to produce sustainable and green hydrogen due to the reduced energy consumption. However, developing high-performance UOR/HER electrocatalysts in seawater instead of pure water remains a great challenge. Herein, (B,P,Co,Fe)-Ni anchored on Paulownia Wood (PW) is proposed to enhance the overall urea-(sea)water splitting performance. The resulting sample only needs a potential of 1.34 V to deliver a large current density of 100 mA cm−2 for alkaline UOR and features a remarkable durability to maintain 100 mA cm−2 for 100 h. The HER and UOR (HER||UOR) coupled system in alkaline seawater-urea electrolyte for producing H2 demonstrated a more significantly reduced electrolyzer voltage of 1.67 V obtained at 100 mA cm−2 in comparison to that of the HER||OER system (1.98 V). The well-aligned micro-channels and nanopores in wood frameworks not only improve the hydrophilicity and aerophobicity of the whole electrode, which is conducive to the penetration of the electrolyte and release of bubbles, but also shorten the transmission distance of ions and intermediates to accelerate the reaction kinetic process. Density functional theory calculations reveal that Co, Fe, P and B co-doping in Ni effectively adjusts the electronic structure, and the adsorption/desorption behavior of the urea reaction intermediates is regulated by the synergistic effect from multiple components, resulting in an excellent catalytic activity in seawater-urea media. This work promotes a better understanding of the surface electronic structure modulation of nanowood via doping strategy and offers great potential in the design of advanced UOR/HER catalysts for hydrogen production and urea wastewater treatment.
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DYES AND PIGMENTS
·
2024
·
IF 4.1
Xiqi Su,Le Wang,Xiao Zhang,Jin-Hua Xie,Yi Qu,Di Zhang,Li-June Ming
The extensive use of tetracycline antibiotics (TCs) renders their widespread in the environment that may cause bacterial resistance. Thus, detection of residual TCs and understanding of their broader roles and impacts in the environment and soil ecology are is of critical significance. This paper describes the investigation of a Mg (II)-specific fluorescent micro-probe (PCC–Mg) based on cyclotriphosphazene (Cpz) and curcumin for classical TC•HCl sensing with a low detection limit of 29 nM and a fast response time of less than 10 s. The sensing mechanism is presumably attributed to specific Mg 2+ binding with TCs since the fluorescence enhancement is not observed in the absence of Mg 2+ and not influenced by the presence of several metal ions and anions. The binding of Mg 2+ to curcumin/TC and the formation of TC-metal-curcumin ternary complex can be concluded with NMR and mass spectrometry . Moreover, for the purpose of easy applications, test strips are made to render visual detection of TC with noticeable and selective fluorescence enhancement. The formation of the ternary complex between Cur from the popular herb Curcuma longa and TC from Streptomyces spp. mediated by metal ions also hints a potential role of microbiolochemical-phytochemical interactions in maintaining biodiversity and equilibria in soil microecology.
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