JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 7
·077509
·
IF 3.9
Qi Wang,Wenjing Liu,Jinjin Zhang,Jianying Qu
In this work, Cu/N-C derived from MOF composites were synthesized and characterized by SEM, XRD, FTIR, XPS and EIS, which was modified on the glassy carbon electrode (GCE) to construct a novel electrochemical sensor (Cu/N-C/GCE). Due to the good electrical conductivity and abundant catalytic active sites of Cu/N-C, Cu/N-C/GCE exhibited excellent electrocatalytic performance for catechol (CC) and hydroquinone (HQ) with the oxidation peak potential difference of 112 mV. The proposed sensor could realize the simultaneous detection of CC and HQ successfully. Under optimal conditions, the redox peak currents of both CC and HQ have good linear relationship with their concentrations in the ranges of 0.50–100.00 μM and 0.50–150.00 μM with the detection limits for CC and HQ of 0.12 μM and 0.09 μM, respectively. At the same time, the sensor exhibits good stability, reproducibility and selectivity in the analysis of practical samples.
研究领域:
分析化学
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材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Haolong Nie,Jing Wen,Chaoqun Shang,Xiaomin Wang,Pu Hu
Zinc-ion batteries (ZIBs) are promising candidates for next-generation energy storage systems due to their high energy density and low cost. However, challenges such as poor cycling stability and sluggish kinetics hinder their practical application. In this study, we propose a novel heterostructure composed of microsphere V2O3 integrated with vanadium nitride (VN) and uniformly coated with carbon (V2O3/VN@C) to address these challenges. The optimized V2O3/VN@C heterostructure exhibits excellent stability during cycling within a voltage window of 0.1–1.3 V (vs Zn/Zn2+). The V2O3/VN@C electrode exhibits a large specific capacity (278 mA h g–1 at 200 mA g–1), remarkable cycling stability (96% capacity retention after 400 cycles at 200 mA g–1), improved rate capacity (141 mA h g–1 at 15 A g–1), and higher energy density besides. Furthermore, the investigation of the Zn-ion storage mechanism in the V2O3/VN@C electrode reveals that the heterostructure effectively enhances the conductivity and inhibits the phase transition of V2O3 to a high-valence state. During charging and discharging, the heterostructure facilitates the desolvation process of Zn[H2O]62+ and accelerates the charge transfer kinetics of the electrodes. The proposed strategy provides new opportunities for designing long-cycling and high-energy cathodes for AZIBs and beyond.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 3
·1-13
·
IF 2.8
Li Caixia,Lu Peng,Ma Xiaoxuan,Zhang Kun,Li Chenglong
The rapid advancement of wearable electronic devices demands high-performance sodium-ion battery (SIB) cathode materials, particularly in terms of stability and electrochemical performance. Sodium super ionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 3 (NVP) has attracted significant attention due to its unique framework structure and high theoretical capacity. However, the inherently low electrical conductivity of NVP limits large-scale application. To address this issue, a novel NVP@C-rGO composite was synthesized using metal–organic frameworks (MOF) and reduced graphene oxide (rGO). The structures of these two forms of carbon enhance the charge transfer kinetics of NVP and provide two stress-buffering layers, thereby improving the structural stability of the material while significantly facilitating charge transport. Electrochemical testing confirmed the effectiveness of this strategy: at a current density of 500 mA g⁻ 1 , the NVP@C-rGO composite retained 71.1% of capacity after 600 cycles, compared to only 21.2% for unmodified NVP. Furthermore, due to the synergistic effect between rGO and MOF-derived NVP, the composite achieved a high specific capacity of 89.9 mAh g⁻ 1 under the same conditions, while NVP reached only 62.7 mAh g⁻ 1 . This significant improvement in performance, combined with the exceptional cycling stability and rate capability of the NVP@C-rGO||HC-rGO full cell, highlights the potential of the composite as a next-generation energy storage material for flexible and wearable electronic devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 32
·1802281
·
IF 13.325
Chen Bai,Zhengyang Jia,Lina Song,Wei Zhang,Yi Chen,Fengchao Zang,Ming Ma,Ning Gu,Yu Zhang
To achieve the accurate diagnosis of tumor with the magnetic resonance imaging (MRI), nanomaterials-based contrast agents are developed rapidly. Here, a tumor targeting nanoprobe of c(RGDyK) modified ultrasmall sized iron oxide is reported with high saturation magnetization and high T 1 -weighted imaging capability, attributed to a large number of paramagnetic centers on the surface of nanoprobes and rapid water proton exchange rate (inner sphere model), as well as strong superparamagnetism (outer sphere model). These nanoprobes could actively target and gradually accumulate at the tumor site with a time-dependent T 1 –T 2 contrast enhancement imaging effect. In in vivo MRI experiments, the nanoprobes exhibit the best T 1 contrast enhancement at 30 min after intravenous administration, followed by gradually vanishing and generating T 2 contrast enhancement with increasing time at tumor site. This is likely due to time-dependent nanoprobes aggregation in tumor, in good agreement with in vitro experiment where aggregated nanoprobes display larger r 2 / r 1 value (19.1) than that of the dispersed nanoprobes (2.8). This dynamic property is completely different from other T 1 -T 2 dual-modal nanoprobes which commonly exhibit the T 1 - and T 2 -weighted enhancement effect at the same time. To sum up, these c(RGDyK) modified ultrasmall Fe 3 O 4 nanoprobes have significant potential to improve the diagnostic accuracy and sensitivity in MRI.
研究领域:
生物医学工程
·
纳米医学
·
影像诊断学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·1986-2000
·
IF 4.5
Xue Yi-Fan,Feng Jie,Song Yun-Cai,Li Wen-Ying
Breakage of the C–N bond is a structure sensitive process, and the catalyst size significantly affects its activity. On the active metal nanoparticle scale, the role of catalyst size in C–N bond cleavage has not been clearly elucidated. So, Ru catalysts with variable nanoparticle sizes were obtained by modulating the reduction temperature, and the catalytic activity was evaluated using 1,2,3,4-tetrahydroquinoline and o -propylaniline with different C–N bond hybridization patterns as reactants. Results showed a 13 times higher reaction rate for sp 3 -hybridized C–N bond cleavage than sp 2 -hybridized C–N bond cleavage, while the reaction rate tended to increase first and then decrease as the catalyst nanoparticle size increased. Different concentrations of terrace, step, and corner sites were found in different sizes of Ru nanoparticles. The relationship between catalytic site variation and C–N bond cleavage activity was further investigated by calculating the turnover frequency values for each site. This analysis indicates that the variation of different sites on the catalyst is the intrinsic factor of the size dependence of C–N bond cleavage activity, and the step atoms are the active sites for the C–N bond cleavage. When Ru nanoparticles are smaller than 1.9 nm, they have a strong adsorption effect on the reactants, which will affect the catalytic performance of the Ru catalyst. Furthermore, these findings were also confirmed on other metallic Pd/Pt catalysts. The role of step sites in C–N bond cleavage was proposed using the density function theory calculations. The reactants have stronger adsorption energies on the step atoms, and step atoms have d-band center nearer to the Fermi level. In this case, the interaction with the reactant is stronger, which is beneficial for activating the C–N bond of the reactant.
研究领域:
催化化学
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材料科学
·
理论化学
✓ 已验证
DOI
高影响因子
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
·
2018
·
IF 2.913
Liangliang Mu,Xiaoxue Yin,Yanhui Xiao,Xia Bian,Yanjian Yang,Liting Wu,Jianmin Ye
Collectins, a subfamily of the C-type lectins, are able to bind non-self glycoconjugates on the surface of microorganisms and inhibit infection by direct neutralization, agglutination and/or opsonization , which play important roles in innate immunity . In this study, a CL11X1-like collectin (OnCL11X1) was identified from Nile tilapia ( Oreochromis niloticus ) and characterized at expression and agglutination functional levels. The open reading frame of OnCL11X1 is 840 bp of nucleotide sequence encoding polypeptides of 279 amino acids . The deduced amino acid sequence is highly homology to teleost and similar to mammalian CL11X1, containing a canonical collagen-like region, a carbohydrate recognition domain and a neck region. Expression analysis revealed that the OnCL11X1 was highly expressed in the liver, and widely exhibited in other tissues including kidney, intestines and spleen. In addition, the OnCL11X1 expression was significantly up-regulated in spleen and anterior kidney following challenges with a Gram-positive bacterial pathogen ( Streptococcus agalactiae ) and a Gram-negative bacterial pathogen ( Aeromonas hydrophila ). The up-regulation of OnCL11X1 expression was also demonstrated in hepatocytes and macrophages in vitro stimulation with S. agalactiae and A. hydrophila . Recombinant OnCL11X1 protein was able to agglutinate both S. agalactiae and A. hydrophila in vitro and promote the phagocytosis by macrophages. Taken together, the results of this study indicated that OnCL11X1, possessing apparent agglutination and opsonization ability to bacterial pathogens, might be involved in host defense against bacterial infection in Nile tilapia.
研究领域:
免疫学
·
鱼类生物学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers in Energy
·
2025
·
IF 6.2
Tang Wenbin,Xia Shuyue,Chou Haiwen,Zhao Jianan,Zhou Yi,Huang Qinghong,Yu Nengfei,Wu Yuping
The oxygen reduction reaction (ORR) plays a crucial role in key processes of fuel cells and zinc-air batteries. To enable commercialization, reducing the platinum (Pt) content and increasing the specific activity per unit mass is essential. A promising approach involves synthesizing of Fe-N-C precursors via the polyaniline (PANI) pathway, which ensures a uniform distribution of Fe-N-C species and facilitates the subsequent adsorption of platinum ions. This leads to the formation of Pt-Fe bimetallic alloys. The synergistic interaction between Pt and Fe-N-C sites promotes the homogeneous dispersion of Pt and the formation of smaller particle sizes, which in turn enhances intrinsic activity and stability of the catalyst. Notably, the Pt/Fe-N-C catalyst, featuring an ultra-low Pt loading of just 1.79 wt%, exhibits a remarkable doubling of mass activity compared to conventional catalysts. Moreover, zinc-air batteries using this catalyst achieve an impressive peak power density of 200 mW/cm 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 3
·1892-1898
·
IF 3.159
Xuehua Yin,Jin Cai,Hongyan Feng,Zeming Wu,Jianmei Zou,Qingyun Cai
A novel ultrasensitive sensing system for rapid fluorescence detection of cytochrome c (cyt c) was proposed by combining aptamer-based bioassay with VS2 nanosheets. VS2 nanosheets with high fluorescence quenching ability were synthesized by the solution route. A cyt c-binding aptamer was tagged with the fluorescent dye carboxy fluorescein (FAM), acting as the probe. VS2 nanosheets can adsorb the probe and quench its fluorescence efficiently. However, the fluorescence of the probe was retained when it was incubated with cyt c and then mixed with VS2 nanosheet solution. The proposed sensing system shows high selectivity and sensitivity, giving a linear range of 0.75 nM to 50 μM, and a limit of detection of 0.50 nM.
研究领域:
纳米技术
·
生物传感器
·
分析化学
·
生物分析化学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3473-3482
·
IF 2.8
Liu Xiaofei,Wu Yuandong,Mei Dajiang,Wen Shaoguo
The pyrochlore-type material Co 2 Sb 2 O 7 @C was synthesized through high-temperature solid-state reactions. Co 2 Sb 2 O 7 and Co 2 Sb 2 O 7 @C were characterized by PXRD, XPS, SEM, EDS, and BET. At the current density of 200 mA g −1 , the first cycle discharge capacity of Co 2 Sb 2 O 7 @C is 1266 mAh g −1 . After 100 cycles, the specific discharge capacity can still reach 463 mAh g −1 , which is higher than the 76 mAh g −1 of Co 2 Sb 2 O 7 . With the increase in scanning rate, the contribution rate of the Co 2 Sb 2 O 7 @C pseudo-capacitor varies from 69.2 to 92.5%. The electrochemical performance is due to the conversion and alloying reaction of Li 3 Sb, the coating of amorphous carbon, and the contribution of pseudo-capacitance.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Zhangxing He,Yingqiao Jiang,Jing Zhu,Yuehua Li,Zhen Jiang,Huizhu Zhou,Wei Meng,Ling Wang,Lei Dai
In this paper, LiTi 2-x Sn x (PO 4 ) 3 /C (x = 0, 0.2, 0.3, 0.4) composites were synthesized by sol-gel approach, and were investigated as anodes for aqueous lithium ion battery . Sn doping with proper content has no obvious influence on phase and morphology of the composite, while excessive dosage of Sn can affect its crystal structure. Sn doping can enhance the electrochemical properties of LiTi 2 (PO 4 ) 3 /C (LC). Among LiTi 2-x Sn x (PO 4 ) 3 /C composites, LiTi 1.7 Sn 0.3 (PO 4 ) 3 /C (LC-Sn-0.3) demonstrates the best electrochemical properties. Most importantly, the rate performance of LC can be improved dramatically by Sn doping on Ti sites. LC-Sn-0.3 delivers a discharge capacity of 118.9, 115.3, and 104.2 mAh g −1 at 0.2, 6, and 20 C (1 C = 150 mA g −1 ), respectively, with significant increase of 15.2, 27.4, and 41.9 mAh g −1 compare with LC. In addition, LC-Sn-0.3 exhibits superior cycling performance. The capacity retention for LC-Sn-0.3 can keep 76.8% after 1000 cycles at relatively high rate of 10 C, while only 51.7% of initial discharge capacity is retained for LC. Our study reveals that Sn doping on Ti sites is an efficient and facile method to improve the performance of LiTi 2 (PO 4 ) 3 /C composite for aqueous lithium ion battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Qingtao Liu,Weihao Liu,Xin Wan,Weiwei Chen,Xiaozhi Liu,Xiaofang Liu,Jiaxiang Shang,Jungang Miao,Dong Su,Xin Sun,Jianglan Shui
Zeolitic imidazolate framework-8 (ZIF-8) is widely used as precursor for carbon-supported single-metal-atom catalysts (M–N–C), but typically yields amorphous carbon with poor stability in proton-exchange-membrane fuel cells (PEMFCs). Traditional methods would lose active site density while increasing the graphitization degree. Here, this study reports that ultra-small nano ZIF-8 can produce graphene-nanostacks-based Fe–N–C that has improvements on both activity and stability. First, anti-sintering nanoporous ZIF-8 (nano-ZIF8) particles are synthesized with unit size of 8 nm (the smallest so far) using a destruction-reconstruction strategy. In situ microscopy reveals that the volatilization of Zn has a decisive effect on the graphitization degree of ZIF-8 and such process is size-dependent. Nano-ZIF8 particles have completed Zn volatilization before graphitization process beginning, leading to graphene nanostacks. These nanostacks preferentially host edge-type FeN 4 sites, which have doubled intrinsic activity and much improved stability compared with conventional Fe−N−C. In PEMFC, the catalyst achieves an activity of 48.5 mA cm − 2 @0.9V iR -free , meeting the US Department of Energy 2025 activity target. In addition, quantitative analysis of active site density is conducted in PEMFC for the first time using nitrite stripping voltammetry. The unique graphitization behavior of nano-ZIF8 paves a new avenue for advancing M–N–C catalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2018
·
IF 4.805
Chao Zhang,Yugang Song,Zhihui Sang,Lingpeng Zhan,Yu Rao
A strategy combining O- and N-containing directing groups has been developed for the synthesis of 2,2′-biaryl via Pd-mediated C–H bond activation and oxidative coupling. This new transformation may proceed through a mechanism involving Pd(II) and Pd(IV) intermediates. We found the use of PTSA and HFIP to be critical for the reaction and suggest that these reagents could serve as efficient ligands for this C–C bond formation. This methodology provides broad functional group tolerance, excellent reactivity, and high yields.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）