APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wen Wen Xie,Tong Zhen Tian,Min Yang,Nian Wu Li,Le Yu
Rational design of effective bifunctional inexpensive oxygen electrocatalyst is highly important for Zn-air batteries (ZABs), which can accelerate both oxygen reduction/evolution reactions at the oxygen electrode. Herein, we present the formation of hierarchical hollow frameworks of dual-sided Fe/Fe 3 C@N-doped carbon nanotubes (FNCHFs) through a template-engaged method. Benefitting from the synergistic effect between the robust hollow frameworks and in-situ grown dual-sided N-doped carbon nanotubes, the FNCHF electrocatalyst presents enhanced mass/electron transport with high structural stability. As a result, the FNCHFs based bifunctional oxygen electrode demonstrates a desirable oxygen electrocatalytic activity and stability with a half-wave potential of 0.863 V for oxygen reduction and an overpotential of 340 mV to reach the current density of 10 mA cm −2 for oxygen evolution. The corresponding ZAB exhibits a high peak power density of 206 mW cm −2 , a high specific capacity of 781 mAh g Zn −1 , and a good cycling stability more than 300 h.
✓ 已验证
产品关联
DOI
高影响因子
Fundamental Research
·
2022
·
IF 0
Feng Ma,Xuan Liu,Xiaoming Wang,Jiashun Liang,Jianyu Huang,Cameron Priest,Jinjia Liu,Shuhong Jiao,Tanyuan Wang,Gang Wu,Yunhui Huang,Qing Li
Transition metal supported N-doped carbon (M-N-C) catalysts for oxygen reduction reaction (ORR) are viewed as the promising candidate to replace Pt-group metal (PGM) for proton exchange membrane fuel cells (PEMFCs). However, the stability of M-N-C is extremely challenging due to the demetalation, H 2 O 2 attack, etc. in the strongly oxidative conditions of PEMFCs. In this study, we demonstrate the universal effect of Zn on promoting the stability of atomically dispersed M-N x /C (M = Co, Fe, Mn) catalysts and the enhancement mechanism is unveiled for the first time. The best-performing dual-metal-site Zn-Co-N-C catalyst exhibits a high half-wave potential ( E 1/2 ) value of 0.81 V vs. reversible hydrogen electrode (RHE) in acid and outstanding durability with no activity decay after 15,000 accelerated degradation test (ADT) cycles at 60 °C, surpassing most reported Co-based PGM-free catalysts in acid media. For comparison, the Co-N-C in the absence of Zn suffers from a rapid degradation after ADT due to the demetalation and higher H 2 O 2 yield. X-ray adsorption spectroscopy (XAS) and density functional theory (DFT) calculations suggest the more negative formation energy (by 1.2 eV) and increased charge transfer of Zn-Co dual-site structure compared to Co-N-C could strength the Co-N bonds against the demetalation and the optimized d-band center accounts for the improved ORR kinetics.
✓ 已验证
产品关联
DOI
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Hui-Chao GUAN,Xiao-Tong SONG,Gui-Bao LIU,Shu-Mei YUE
Complexes [Zn(pbm)(5-hip)3] ( 1 ), [Zn(pbm)(5-nip) 3 ] ( 2 ), [Mn(pbm)(H 3 btc) 2 (H 2 O)] ( 3 ) and [Mn(pbm)(5-nip) 3 ] ( 4 ), where H 2 HIPA = 5-hydroxyisophthalic acid, H 2 nip = 5-nitroisophthalic acid, H 3 btc = trimesic acid and pbm (pyridine benzene chelate material) = 2-(2-pyridyl)benzimidazole, were identified via single-crystal XRD analyses. 1, 2 and 4 pertain to the monoclinic space group C 2/ c , while 3 belongs to the triclinic space group P ① . The interplay of CT-DNA with those complexes was delineated using ultraviolet, fluorescence, and circular dichroism (CD) spectroscopy and viscosity measurements. Complexes 1, 2, 3 and 4 interact with CT-DNA in an electrostatic or grooving mode. We wish to offer a theory-wise foundation for developing anti-tumor medicines.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Hui Peng,Faqiang Wang,Danyang Wang,Shuzhen Cui,Wenbo Hou,Guofu Ma
Aqueous Zn–MnO2 batteries have received much attention due to their low cost, safety, reliability, and large storage capacity. However, the sluggish ion/electron transport kinetics of bulk MnO2 inevitably decreases the rate capability and cycle stability of Zn–MnO2 batteries. Herein, hierarchical MnO2 nanosheet arrays self-anchored and grown in polyaniline-derived carbon nanotubes (PCNT@MnO2, denoted as PCMO) with enhanced stability are prepared by employing PCNT as both a substrate and a sacrificial reductant. The hollow PCNT conductive skeleton feature and robust integrated MnO2 nanosheet arrays in PCMO are not only favorable for enhancing electronic conductivity and accelerating electronic migration but also provide effective nucleation sites for the growth of MnO2 nanosheets and unimpeded ion channels, resulting in high specific capacity, rapid ion-diffusion kinetics, and long-term cycle stability. Specifically, the optimized PCMO material (PCMO-2) can deliver 264 mAh g–1 at 0.2 A g–1 after 120 cycles without obvious capacity decay, superior to the bare MnO2 material. Moreover, the as-fabricated PCMO//Zn battery can exhibit a high energy density of 320.2 Wh kg–1 at a power density of 120 W kg–1. The rational design of low-cost and integrated core–shell architecture with robust contact between MnO2 nanosheet arrays and a hollow conductive skeleton is expected to achieve cost-effective and high-performance Zn–MnO2 batteries.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Fu,Chonghua Shi,Zhitong Li,Jiajin Nie,Shaowei Yao
Herein, a unique dodecahedron composite material of Zn-Co bimetallic zeolitic imidazolate frameworks (ZIFs) and carbon nanotubes (CNTs) is synthesized by a simple room temperature static precipitation-annealing process. As an anode material for lithium-ion batteries (LIBs), the designed nanomaterials exhibits excellent lithium storage performance and cycle performance. It demonstrates a high discharge specific capacity of 720.9 mAh g -1 at 100 mA g -1 . Besides, a high reversible capacity of 608.7 mAh g -1 at a current density of 500 mA g -1 after 300 cycles. The significant improvement in the electrochemical performance of Zn/Co-ZIFs/CNTs nanocomposite can be attributed to the strong synergy between Zn/Co-ZIFs and CNTs.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Muhammad Sohail,Bin Xie,Bingzhi Li,He Huang
The significance of antioxidant activity determination in health sciences and food technology has become a hot research area as it is directly related to oxidative stress which is affiliated with several diseases and food deterioration. Herein, we fabricated a Zn-CDs-based (Zn-doped carbon dots-based) bioanalytical probe for the estimation of antioxidant activity index (AAI) to cope with the truncated robustness, high interference effect in complex samples, photo-bleaching, and low stability of the traditional techniques. Besides, the novel AAI standardized the presentation of the results by considering the transducer, Zn-CDs, concentration as reported results vary diversely for the same sample. In principle, free radicals quenched the fluorescence of the probe via inner filter effect and dynamic quenching. The presence of antioxidants hindered the fluorescence quenching by sequestering the free radicals from the reaction. The designed nanoreagent was validated for its applications using ascorbic acid , human serum, topical cosmetic formulation, and tomato juice samples. The bioanalytical probe demonstrated precise linearity, high robustness, low interference effect, and analytical equivalence when compared to the DPPH free radical assay. Hence, it can be used for the diagnosis and follow-up of oxidative stress-related ailments, developing and characterizing cosmeceuticals, analysis of antioxidant-containing formulations, and assessing and controlling the quality of food products. It is the first report to explore the antioxidant feature of Zn-CDs and its advantage for the estimation of AAI.
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2022
·
IF 4.035
Shi-bin Lu,Ying Meng,Hai-bo Wang,Xian-wei Jiang,Jin Yang,Ning Wei,Lin Jin,Li-juan Wan,Hao Tang,Qian-qian Hou
A porous 3D cross-linked conductive network pierced by multi-wall carbon nanotubes (MWCNTs) was successfully designed from zeolitic imidazolate framework-8 (ZIF-8). Zn@NPC@MWCNTs composites were tailored by the facile regulating the mass ratios and thermal annealing treatment. Due to the combination of less eddy current loss and dielectric loss together with multiple reflection attenuation caused by a unique structure. With a 10 wt% filler loading, the Zn@NPC@MWCNTs composites carbonized at 800 °C show two high reflection loss ( RL ) values with different thicknesses. An RL value is −53.18 dB with 4.09 mm thickness in the C-Band (4–8 GHz), and a minimum RL can reach −74.83 dB (10.8 GHz) with a matching thickness of 2.749 mm. The effective absorption bandwidth is 4 GHz (from 8 to 12 GHz, RL ≤ −10 dB), which just covers the full X-band. Low cost and easy preparation can also provide advantages to develop MOF-based materials as effective EMW absorbents.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanjun Pang,Xinxin Luan,Kefeng Zhang,Yuxiang Liu,Lu Li,Congxia Xie,Jinhui Pang
In this study, we have successfully prepared a freeze-resistant conductive hydrogel with a fast polymerization rate and excellent mechanical and adhesive properties. In this paper, hydrogels capable of rapid polymerization in a short time were prepared based on the TA@WSCA-Zn (WSCA, water-soluble cellulose acetate; TA@WSCA, tannic acid-coated WSCA suspension; TA@WSCA-Zn, a certain amount of zinc chloride (ZnCl 2 ) was added to TA@WSCA suspension;) autocatalytic system at room temperature or low temperature. TA@WSCA-Zn forms a stable reversible quinone-catechol redox reaction to activate the decomposition of ammonium persulfate (APS, initiator) to produce SO 4 −· radicals, which triggers the ultra-fast polymerization of amphoteric ([2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl), SBMA) and acrylic monomers (AA). To improve the frost resistance and electrical conductivity of the hydrogels, we also introduced amphoteric ions, which can provide migration channels for Zn 2+ and greatly increase the migration rate. The TA@WSCA-7.5/PSA hydrogel (PSA, hydrogel prepared by polymerization of acrylic acid and SBMA as monomers;) can achieve tensile strength and toughness of 1.33 MPa and 4.89 MJ m −3 . It can provide excellent electrical conductivity and interfacial adhesion over a temperature range of 25 to −60 °C. In addition, the supercapacitor assembled from the TA@WSCA-7.5/PSA hydrogel electrolyte still has good capacitance characteristics after folding and 10,000 charge/discharge cycles, with a capacitance retention of 93.33 % and an excellent cycle life. This autocatalytic system provides a new strategy and approach for the preparation of freeze-resistant conductive hydrogel electrolytes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD QUALITY
·
2021
·
IF 2.45
Tingting Liu,Shanshan Zhang,Nan Wang,Xinle Xu,Hongcheng Liu,Dawei Wang,Yanrong Zhang
With Auricularia cornea Ehrenb polysaccharide (ACEP) as raw material, the purpose of the study was to prepare Auricularia cornea Ehrenb polysaccharide-zinc (ACEP-Zn) complex. Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and other means are used to analyze the physical-chemical properties and structure of ACEP and ACEP-Zn, to investigate the inhibition of α-glycosidase and α-amylase enzymes, and to explore its effects on the glucose metabolism of insulin-resistant HepG2 cells. Nuclear magnetic resonance (NMR) results show that a group of COO-, -CH3, and -OH in the sugar chain binds to Zn2+. Compared with the original polysaccharides, the surface morphology of ACEP-Zn changed obviously, and the molecular weight (Mn) of ACEP-Zn decreased, but the molecular agglomeration of ACEP-Zn increased. Moreover, the inhibitory effect of ACEP-Zn on α-glucosidase and α-amylase was stronger than that of the original polysaccharide. The results indicated that the structure of Auricularia cornea Ehrenb polysaccharide was changed obviously after the zinc complex, and its hypoglycemic activity was enhanced in vitro. In the cell experiment, the glucose consumption of IR-HepG2 cells was significantly increased at a concentration of 50–200 μg/mL (). The activity of SOD and NOS significantly increased (), and the activity of intracellular PK increased (). Therefore, it was speculated that the hypoglycemic effect of Auricularia cornea Ehrenb polysaccharide combined with zinc was related to the alleviation of liver cell damage caused by oxidative stress and the improvement of glucose metabolism of IR-HepG2 cells. The study provides a theoretical basis for the application of the polysaccharide-zinc complex in the hypoglycemic functional food field.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52041
·
IF 3.125
Zhiyuan Song,Jie Wang,Qian Tao,Yang Yu,Hui Zhang,Chuanqun Hu,Hongyu Cen,Xuan Zheng,Tao Hu,Chonggang Wu
Zn-salt poly(styrene– ran –cinnamic acid) (SCA–Zn) ionomers were successfully synthesized via the melt neutralization of poly(styrene– ran –cinnamic acid) (SCA), which has a comparable molecular weight ( = 217,000) to commercial polystyrene (PS), with different mass fractions of ZnO (0.62, 1.6, and 3.9 wt.%) and the successful synthesis was confirmed by Fourier transform infrared spectroscopy. The mechanical properties, heat resistance, and processibility of the PS, SCA, and SCA–Zn samples were characterized. Compared to SCA, the three SCA–Zn ionomers exhibited significantly higher α cN values, with the ionomers containing 1.6 and 3.9 wt.% ZnO were 11.4% and 68.6% higher than that of SCA, respectively. Compared to commercial PS, SCA–Zn also exhibited significant improvements in heat resistance (glass transition temperature and vicat softening temperature both improved by about 20 °C) and impact toughness ( α cN values of the ionomers containing 1.6 and 3.9 wt.% ZnO were 69.6% and 156.5% higher than that of PS), while the processability of SCA–Zn was not significantly worse than that of PS. This method efficiently improves both the toughness and heat resistance of PS, providing an efficient way to expand the market application of styrenic resins.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xin Li,Tong Wu,Zhiqiang Jia,Tong Hao,Hong Zheng
A widely applicable Zn-DMTD-MOGs was prepared via direct construction strategy. • Zn-DMTD-MOGs shows great potential for trace heavy metals removal from real water. • DFT provides a local coordination cluster model for amorphous MOGs at atomic scale. • Synergistic chelating/monodentate coordination and LMCT enable efficient lead capture. Metal-organic gels (MOGs) have attracted extensive attention in the field of heavy metal removal, owing to their advantages including ease of surface modification, good stability, hierarchical pore structure, tunable functional groups, and mild and facile preparation conditions. However, the existing MOGs still leave considerable room for performance improvement. To produce MOGs with enhanced adsorption sites, high specific surface area, and greater pore volume, this study combined ultrasound-assisted nucleation with a high-concentration reaction strategy and triethylamine-mediated deprotonation, thereby enabling direct coordination between 2,5-Dimercapto-1,3,4-thiadiazole (DMTD) and Zn 2+ . Then, Zn-DMTD-MOGs material with higher-density N and S adsorption sites was successfully synthesized. The material exhibits a disordered particle-stacked amorphous structure with abundant mesopores (3–24 nm). Adsorption experiments demonstrate that the material achieves a trace Pb(II) removal efficiency of 96.98% within 10 s. The material achieves wide applicability over a low concentration range (≤ 42 mg/L) and a broad pH range (3.5–10.5), along with favorable stability, good reusability, and applicability to real water matrices. A local coordination cluster model was obtained through density functional theory (DFT) geometry optimization, and a synergistic chelating/monodentate coordination and ligand-to-metal charge transfer (LMCT) mechanism was established. The analysis reveals that the material adsorbs Pb(II) primarily through chelation at dual N/S sites and monodentate coordination at single S sites. This mechanism endows Zn-DMTD-MOGs with ultrafast adsorption kinetics and excellent cyclic stability, making them promising candidates for heavy metal remediation in drinking water sources. Download: Download high-res image (120KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Yuting He,Hongtao Li,Yi Wang,Yufei Jia,Yongning Liu,Qiang Tan
M−N−C (M = Fe, Co, Ni, etc.) catalyst owns high catalytic activity in the oxygen catalytic reaction which is the most likely to replace the Pt-based catalysts. But it is still a challenge to further increase the active site density. This article constructs the high-efficiency FeMn-N/S-C-1000 catalyst to realize ORR/OER bifunctional catalysis by hetero-atom, bimetal (Fe, Mn) doped simultaneously strategy. When evaluated it as bi-functional electro-catalysts, FeMn-N/S-C-1000 exhibits excellent catalytic activity ( E 1/2 = 0.924 V, E j =10 = 1.617 V) in alkaline media, outperforms conventional Pt/C, RuO 2 and most non-precious-metal catalysts reported recently. Such outstanding performance is owing to N, S co-coordinated with metal to form multi-types of single atom, dual atom active sites to carry out bi-catalysis. Importantly, nitrite poison test provides the proof that the active sites of FeMn-N/S-C are more than that of single-atom catalysts to promote catalytic reactions directly. To better understand the local structure of Fe and Mn active sites, XAS and DFT were employed to reveal that FeMn-N 5 /S-C site plays the key role during catalysis. Notably, the FeMn-N/S-C-1000 based low-temperature rechargeable flexible Zn-air also exhibits superior discharge performance and extraordinary durability at −40 °C. This work will provide a new idea to design diatomic catalysts applied in low-temperature rechargeable batteries.
✓ 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）