PURE AND APPLIED CHEMISTRY
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2012
·Vol. 85
·期 2
·417-425
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IF 2.789
Xiao Wang,Feng Hao,Huiyuan Chen,Gang Wang,Jianbao Li,Hong Lin
Single-crystalline anatase TiO 2 nanorods (TiO 2 -SANRs) were synthesized through a facile solvothermal method and successfully applied as the photoanodes for efficient dye-sensitized solar cells (DSCs). The prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The power conversion efficiencies of TiO 2 -SANRs decorated Degussa P25 nanoparticle solar cells increased by 13.5 % compared with commercial Degussa P25 TiO 2 solar cells under standard illumination conditions (AM 1.5G, 100 mW/cm –2 ). The improved performance of the TiO 2 -SANRs decorated Degussa P25 nanoparticle solar cells was primarily ascribed to the enhanced short-circuit photocurrent density ( J sc ) despite a declined dye-loading capacity. The light-scattering effect in the long-wavelength region, as evidenced from the incident photon-to-current conversion efficiency (IPCE) response and the diffuse reflectance spectroscopy was recognized as the main reason for the photocurrent enrichment.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Zong-Pin Fu,Qi-Jie Zhou,Yun-Peng Zhao,Yu-Fa Wu,Fang-Jing Liu,Mei Zhong,Jian Li,Jing Liang,Jing-Pei Cao
The abundant bridging bonds and side chains in lignin make the selective cleavage of its C-O bonds a promising approach for achieving efficient conversion. Herein, Cu/CoOx-CeO 2 catalysts were prepared and the effects of their physical and chemical structures on C-O bond hydrogenolysis activity were investigated. The results indicated that incorporating an appropriate amount of CeO 2 as a support facilitated the doping of Co n+ cations into the CeO 2 lattice, enhancing oxygen vacancy concentration. Additionally, the Cu K-edge X-ray absorption near-edge structure (XANES) spectra revealed that Cu exists in a mixed valence state (Cu δ+ , 0 < δ < 2) within the catalyst. Reaction pathway regulation was achieved through strategic modulation of reaction conditions. When isopropanol was used as the solvent under a N 2 atmosphere, 2-phenoxy-1-phenylethanol (2-PPE-ol) was completely converted at 180 °C within 2 h, yielding ethylbenzene and cyclohexanol with 100 % selectivity. Conversely, when n -hexane was employed as the solvent, dehydrogenation of the C α -OH group generated hydrogen radicals, which promoted cleavage of the C β -O bond in the β-O-4 ketone intermediate, resulting in phenol and 1-phenylethanol with 100 % selectivity. Isotopic labeling and active hydrogen tracking experiments revealed that the active hydrogen in catalyst transfer hydrogenolysis (CTH) originated from the solvent, whereas self-hydrogen-transfer hydrogenolysis (SHTH) relied on hydrogen derived from the C α -OH group of 2-PPE-ol. This work provides valuable insights into the directional conversion of lignin into high-value chemicals and efficient energy utilization.
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SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Han Zhang,Qiyi Lu,Fumei Zuo,Ruo Yuan,Shihong Chen
A novel “signal-on” biosensor for the detection of concanavalin A (Con A) was designed utilizing an enzymatic reaction to in situ generate coreactant of poly(9,9-di- n -octylfluorenyl-2,7-diyl) (PFO). Firstly, PFO polymers were wrapped with graphene oxide nanosheets to obtain GO@PFO nanocomposite, which was modified onto the surface of the electrode as a matrix for immobilizing phenoxy-derivatized dextran (Dexp) through π-π stacking interaction. Then Con A interacted with Dexp through the specific carbohydrate-protein interaction. Finally, glucose oxidase (GOx) and lactate oxidase (LOx) decorated gold nanoparticles@C 60 -Polyamidoamine (Au@C 60 -PAMAM) was bound onto Con A via a biospecific interaction between Con A and the internal residues of GOx, thus achieving a sandwich structure. In this construction strategy, LOx catalyzed the oxidation of lactate to in situ generate H 2 O 2 , which could act as the coreactant of PFO to enhance the ECL intensity. Due to the excellent ECL property of PFO–H 2 O 2 system, our prepared biosensor showed a wide linear range from 0.001 ng/mL to 10 ng/mL, and a low detection limit down to 0.0003 ng/mL. The integration of excellent ECL property of PFO–H 2 O 2 system and excellent catalytic activity of Au@C 60 -PAMAM would open a new and promising platform for fabricating ECL biosensors and biocatalysts.
研究领域:
分析化学
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生物传感器
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电化学
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纳米技术
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高影响因子
JOURNAL OF CONTROLLED RELEASE
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2022
·
IF 11.467
Jie Bai,Huijuan Zhang,Zhi Yang,Pinglan Li,Bin Liu,Dan Li,Shuang Liang,Qimeng Wang,Zekun Li,Jipeng Zhang,Shanan Chen,Guohua Hou,Yuan Li
Diabetes mellitus is a long-term chronic disease characterized by abnormal high level blood glucose (BG). An artificial closed-loop system that mimics pancreatic β-cells and releases insulin on demand has potential to improve the therapeutic efficiency of diabetes. Herein, a lectin Concanavalin A modified oxidized starch nanogel was designed to regulate glucose dynamically according to different glucose concentrations. The nanogels were formed by double cross-linking the Concanavalin A and glucose units on oxidized starch via specific binding and amide bonds to achieve the high drug loading and glucose responsiveness. The results showed that oxidized starch nanogels prolonged the half-life of antidiabetic peptide drug exenatide and released it in response to high BG concentrations. It could absorb BG at a high level and maintain glucose homeostasis. Besides, the oxidized starch nanogels performed well in recovering regular BG level from hyperglycemia state and maintaining in euglycemia state that fitted in a biological rhythm. In addition, the nanogels showed high biocompatibility in vivo and could improve plasma half-life and therapeutic efficacy of exenatide. Overall, the nanogels protected peptide drugs from degradation in plasma as a glucose-responsive platform showing a high potential for peptide drugs delivery and antidiabetic therapy.
研究领域:
药学
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纳米技术
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生物医学工程
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药物递送系统
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糖尿病研究
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DOI
PubMed
高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Yanmei Kong,Wenjing He,Shanhu Chen,Asad Ali,Dandan Lyu,Liang Shen,Zhi Qun Tian
The trade-off between activity and durability of the oxygen redox reaction (OER and ORR) catalysts, caused by sluggish kinetics and distinct reaction requirements, seriously hinders the application of rechargeable Zn O 2 batteries. Although precious metal catalysts show high activity, they are constrained by cost. Transition-metal catalysts are promising alternatives, but their strong adsorption of oxygen intermediates leads to high reaction energy barriers. Herein, we developed a Co N,SC catalyst (with S atoms doped in the second coordination layer of Co N sites) via coordination reactions and ball milling method. The Co N,SC electrocatalyst exhibits excellent bifunctional performance, with a low potential difference of 0.63 V between the E 1/2(ORR) and the OER overpotential. More importantly, the homemade Zn O 2 battery has a high discharge peak power density of 265.82 mW · cm −2 , a specific capacity of 792.18 mAh · g Zn −1 , and excellent charge-discharge stability with highly reversible energy conversion efficiency. DFT calculations indicate doping with S can enhance the conductivity of the catalysts, adjust the state electron density of the Co N site, and make the d-band center of the Co 3d orbital move down. Therefore, the adsorption energy barriers of the Co N sites to the rate-determining step (O 2 → *OOH in ORR; *OH → *O in OER) are significantly reduced, thus promoting the oxygen redox catalysis reaction kinetics. Our findings open new opportunities for the rational design of non-noble metal catalysts to enhance ORR and OER performance and further improve Zn O 2 battery activities.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Wenling Wu,Haiqiang Wang,Puze Wang,Yang Cheng,Yuan Fang,Jiang Guo,Ting Zhao,Jianfeng Zhu
Two-dimensional (2D) layered MXene (e.g., Ti 3 C 2 T x ) is a research focus for zinc-ion capacitors (ZICs) electrodes due to its large specific surface area and high conductivity. However, its practical use is constrained by two critical bottlenecks: low theoretical capacitance and severe interlayer stacking, which directly reduce Zn 2+ transport efficiency and electroactive site accessibility. Constructing hierarchical structures addresses this by providing efficient Zn 2+ diffusion pathways, abundant electroactive sites, and excellent structural stability. This work prepared a 1D/2D hierarchical CoN-CNTs@PANI/Ti 3 C 2 T x composite via in-situ polymerization and electrostatic self-assembly. First, 1D CoN-CNTs provide polyaniline (PANI) polymerization sites to suppress its volume expansion and to form conductive channels, while spiky PANI shells offer extra faradaic sites. Second, 1D CoN- CNTs@PANI nanotubes prevent the restacking of 2D Ti 3 C 2 T x nanosheets, and the conductive framework of 2D Ti 3 C 2 T x nanosheets further suppresses PANI volume change to enhance rate capability and cycling lifespan. Third, the 1D/2D structure leverages synergies to accelerate interfacial charge/ion transport and reaction kinetics, critical for high-power ZICs. As a result, the three-electrode tests showed the electrode delivered 861.7 F g −1 at 0.5 A g −1 and retained 91 % capacitance after 5000 cycles at 10 A g −1 . The assembled CoN-CNTs@PANI/Ti 3 C 2 T x //Zn ZIC achieved 91.2 Wh kg −1 at 1600 W kg −1 , with 86 % capacity retention after 5000 cycles at 2 A g −1 . This work establishes an advanced MXene-based hierarchical design strategy for high-performance ZIC electrodes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yutong Li,Qiuhong Wei,Haoyue Huang,Shujun Qiu,Yongpeng Xia,Yongjin Zou,Fen Xu,Lixian Sun,Hailiang Chu
Catalyst development remains a critical challenge in chemical hydrogen storage. In particular, efficient, cost-effective heterogeneous catalysts are essential for ammonia borane (NH 3 BH 3 , AB) hydrolysis to enable hydrogen generation. In this study, we developed a self-assembly strategy to fabricate a unique catalyst consisting of a Ru-modified CoN/CoP heterogeneous structure on an MXene support of Ti 3 C 2 T x , creating more multiphase interfaces. Through optimizing experimental conditions, a superior Ru–CoN/CoP@Ti 3 C 2 T x catalyst is achieved, which demonstrates a rapid hydrogen generation rate ( HGR = 1.43 × 10 5 mL min −1 ·g Ru −1 ) and a high turnover frequency ( TOF = 589.7 mol H2 ·mol Ru −1 ·min −1 ) at 25 °C, surpassing most previously reported Ru-based catalysts. The catalytic performance improvement of AB hydrolysis can be ascribed to a much lower apparent activation energy ( E a = 26.3 kJ mol −1 ) and the synergistic effect between CoN/CoP substrates and their interactions with Ru particles and Ti 3 C 2 T x carriers. This study highlights the potential of multi-interface cooperation in advancing the design of heterogeneous catalysts for AB hydrolysis.
研究领域:
催化化学
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材料科学
·
能源化学
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DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Xiangru Wei,Zeyu Hu,Cancan Li,Yali Zhang,Xianglin Xie,Hao Wang,Zhangxiong Wu
Carbon supported atomically dispersed transition metal–nitrogen (MN x ) catalysts are promising for catalysis. Synthesis of such catalysts with high densities of MN x sites is an important task. In this work, a facile and scalable method by combining freeze drying and hard templating is presented for the synthesis of N-doped mesoporous carbon supported high-density and exclusive CoN x sites (denoted as CoN x -NMCs). The influences of the drying method (freeze drying and regular drying) on the aggregation of the silica pore forming agent, the precursor and metal species and the properties and performances of the resulted catalysts are investigated. The strong Co 2+ /histidine and silica/histidine interactions and the homogeneous distribution of the SiO 2 nanoparticles for precursor physical isolation are essential to inhibit metal aggregation, sustain N dopant and generate high densities of CoN x sites. The CoN x -OMCs possess high surface areas (440–630 m 2 /g), uniform mesopores (~ 7 nm), high N contents (2.54–17.84 wt%) and abundant CoN x sites with high single cobalt atom loadings up to 1.7 wt%. The representative catalyst delivers outstanding catalytic performances for hydrogenation of a series of nitro compounds into amines with excellent conversions and selectivities and a high stability with H 2 as the reducing agent and water as the solvent. A series of control experimental results clearly reveal the critical role of the CoN x sites for the chemoselective hydrogenation and clarify the influences of the properties of the catalysts on their performances. The work may provide a general approach and some insight for the development of atomically dispersed MN x catalysts with a high metal atom utilization efficiency for the purpose of various catalytic applications.
研究领域:
催化
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材料科学
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化学工程
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2010472
·
IF 18.808
Jinjin Ban,Xiaohan Wen,Hongjie Xu,Zhuo Wang,Xinhong Liu,Guoqin Cao,Guosheng Shao,Junhua Hu
The structure design and atomic modulation of catalysts are two sides of the same coin, both of which are deemed critical factors to regulate the intrinsic electrocatalytic activity. Herein, cobalt single-atom anchored on nitrogen-doped graphene-sheet@tube (CoSAs-NGST) is derived from a novel Co, Zn-coordinated zeolitic imidazolate framework (CoZn-ZIF) in the presence of dicyandiamide. CoSAs-NGST exhibited a hybrid structure with a bamboo-like graphene tube and sheet. The atomic configuration of intrinsic defects is characterized by electron energy loss spectroscopy. The morphology differentiation from cake-shape structure to low-dimension hybrid not only enhances the dispersity of single atoms but also induces defect state evolution, which results in the formation of a CoN 4 -rich graphene tube. Density functional theory (DFT) modeling revealed that the coupling effect on oxygen reduction reaction and oxygen evolution reaction (ORR/OER) pathways of Co-N 4 -tube and Co-N 4 -sheet is responsible for the enhanced activity of CoSAs-NGST. In addition to the superb ORR/OER bifunctional catalytic performance, CoSAs-NGST also demonstrates a notably small charge–discharge voltage drop of 0.93 V when applied in the rechargeable zinc–air battery outperforming Pt/C + RuO 2 catalyst. The present study provides an insight into the relationship between the structure design and atomic modulation of the carbon based catalysts.
研究领域:
材料科学
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电化学
·
催化
·
能源存储
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DOI
高影响因子
EXPERIMENTAL PARASITOLOGY
·
2023
·
IF 2.1
Muhammad Ehsan,Rui-Si Hu,Meng Wang,Jun-Ling Hou,Muhammad Rashid,Muhammad Irfan Malik
Legumains belonging to C_13 peptidase family of proteins, and are ubiquitously disseminated among all vertebrate and invertebrate organisms, and have been implicated in innumerable biological and cellular functionality. Herein, we characterized and evaluated immunoregulatory characteristics of Legumain-1 from Fasciola gigantica (Fg-LGMN-1) during its interaction with host immune cells . The isopropyl-ß-d-thiogalactopyranoside (IPTG) stimulated RFg-LGMN-1 protein was positively detected by rat serum containing anti-RFg-LGMN-1 polyclonal antibodies . Furthermore, the uptake of RFg-LGMN-1 by goat monocytes was successfully confirmed using Immunofluorescence Assay (IFA). The immunohistochemical analysis revealed the native localization of LGMN-1 protein on the periphery and internal structures such as suckers, pharynx, and genital pore of the adult parasite, thereby validating its presence in excretory-secretory (ES) products of F. gigantica . The RFg-LGMN-1 co-incubated with concanavalin-A (Con-A) stimulated the increase of interleukin 2 (IL-2), IL-10, and IL-17 in monocytes derived from peripheral blood mononuclear cells (PBMCs) in the concentration-dependent manner. However, the IL-4 cytokine in response to the RFg-LGMN-1 protein declined. These results illuminated the role of LGMN-1 during the parasite-host interface. Our findings elaborated additional evidence that Legumain protein play a role in the manipulating host immune responses during parasite infections. However, further evaluation of RFg-LGMN-1 protein in context of its immunomodulatory roles should be conducted to enhance our understandings of the mechanisms employed by F. gigantica to evade host immune responses.
研究领域:
免疫学
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寄生虫学
·
分子生物学
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PubMed
高影响因子
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