Joule
·
2020
·
IF 29.155
Anyi Mei,Yusong Sheng,Yue Ming,Yue Hu,Yaoguang Rong,Weihua Zhang,Shulin Luo,Guangren Na,Chengbo Tian,Xiaomeng Hou,Yuli Xiong,Zhihui Zhang,Shuang Liu,Satoshi Uchida,Tae-Woong Kim,Yongbo Yuan,Lijun Zhang,Yinhua Zhou,Hongwei Han
Summary The stability of perovskite solar cells (PSCs) has been considered as the largest obstacle to their commercialization. Herein, we observed that the main failure mechanism for MAPbI 3 perovskite is the escape of methylammonium (MA) iodide at the grain boundaries in an open space or the reconstruction of crystal in a confined small space, as well as the irreversible long-distance ionic migration under the multiple actions of light, heat, and electrical bias. Strengthened with bifunctional organic molecular of 5-ammoniumvaleric acid (5-AVA) iodide at the grain boundaries, the MAPbI 3 crystal was localized in the nanoscale, and thus, the decomposition or reconstruction was inhibited and the ionic migration became reversible. As a result, we propose a reliable approach to make PSCs meet stability standards of IEC61215:2016 qualification tests. A printable PSC filled with (5-AVA) X MA 1-X PbI 3 has been working for more than 9,000 h at a maximum power point of 55°C ± 5°C without obvious decay.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yu-Yang Liu,Shan Xu,Xiao-Xin Li,Run-Han Li,Xin-Ting Cai,Hui-Zhen Zhong,Jiang Liu,Qing Huang,Lei Zhang,Shun-Li Li,Ya-Qian Lan
Developing strategies and photocatalysts for C(sp3)-H bond functionalization under simple and mild conditions is important but challenging. Here, we report two redox heterocluster-based frameworks, named Ni5-PW12 and Ni5-V16, in which the terminal oxygen atoms of polyoxometalates are directly coordinated to metal atoms in metal–organic clusters. Due to the coexisting strong oxidation and reduction capacities, both of these photocatalysts achieve photocatalytic C(sp3)-H bond oxidative imination through combining oxidation of methyl aromatics and reduction of nitro aromatics reactions. The experimental and theoretical results reveal that benefiting from the short distance between the clusters, the rapid charge transfer and mass transfer processes would enhance the photocatalytic reactivity and inhibit side reactions. More importantly, all of the photocatalytic reactions are carried out in mild conditions at room temperature without any additional solvents, photosensitizers, oxidizing or reducing agents, or cocatalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tian Huang,Jing Zhao,Haijun Li,Wei Zhou,Jintao Wang,Jianliang Shen,Jicai Chen,Xiangwen Liao
Infections caused by methicillin-resistant Staphylococcus aureus ( MRSA ) are a significant public health challenge, necessitating the development of innovative antibacterial strategies. Nanomaterials are recognized for their ability to serve as photothermal conversion agents, transforming light energy into heat for antibacterial applications. These materials act as biological enzymes capable of generating reactive oxygen species (ROS), leveraging their catalytic activity to combat infections. While they show considerable promise, enhancing their ROS-generating efficiency and overall catalytic performance remains a critical challenge. In this work, a high catalytic bimetallic nanoplatform was developed, building on “large electronegativity difference induction/etch-assisted/diffusion termination” mechanism to improve antibacterial efficacy. The synthesized nanoparticles were found to exhibit exceptional photothermal conversion efficiency and surface defects, enabling efficient bacterial eradication. Both in vitro and in vivo experiments demonstrated that H-Pt 3 Sn nanoparticles effectively eliminated MRSA while significantly inhibiting and disrupting biofilms formed by the pathogen. The nanoparticles also facilitated tissue repair by modulating macrophage-related molecular markers. In conclusion, this study presents a promising photothermal synergistic nanosystem with high catalytic functionality for advanced anti-infective applications.
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JOURNAL OF MASS SPECTROMETRY
·
2015
·Vol. 50
·期 1
·212-219
·
IF 2.379
Huixin Wang,Bing Wang,Zhonglin Wei,Hao Zhang,Xinhua Guo
A good understanding of gas-phase fragmentation chemistry of peptides is important for accurate protein identification. Additional product ions obtained by sodiated peptides can provide useful sequence information supplementary to protonated peptides and improve protein identification. In this work, we first demonstrate that the sodiated a 3 ions are abundant in the tandem mass spectra of sodium-cationized peptides although observations of a 3 ions have rarely been reported in protonated peptides. Quantum chemical calculations combined with tandem mass spectrometry are used to investigate this phenomenon by using a model tetrapeptide GGAG. Our results reveal that the most stable [a 3 + Na − H] + ion is present as a bidentate linear structure in which the sodium cation coordinates to the two backbone carbonyl oxygen atoms. Due to structural inflexibility, further fragmentation of the [a 3 + Na − H] + ion needs to overcome several relatively high energetic barriers to form [b 2 + Na − H] + ion with a diketopiperazine structure. As a result, low abundance of [b 2 + Na − H] + ion is detected at relatively high collision energy. In addition, our computational data also indicate that the common oxazolone pathway to generate [b 2 + Na − H] + from the [a 3 + Na − H] + ion is unlikely. The present work provides a mechanistic insight into how a sodium ion affects the fragmentation behaviors of peptides. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
ACS Nano
·
2023
·
IF 17.1
Changhao Zhu,Xuye He,Yun Shi,Zhenkang Wang,Baojiu Hao,Wanhao Chen,Hao Yang,Lifang Zhang,Haoqing Ji,Jie Liu,Chenglin Yan,Jinqiu Zhou,Tao Qian
Despite the numerous advantages of aqueous Zn batteries, their practical application under cryogenic conditions is hindered by the freezing of the electrolyte because the abundance of hydrogen bonds (H-bonds) between H2O molecules drives the aqueous system to transform to an orderly frozen structure. Here, a design of H-bond interactions based on the guiding ideology of “strong replaces weak” is proposed. The strong H-bonds formed between introduced eutectic components and water molecules break down the weak H-bonds in the original water molecule network, which contributes to an ultralow freezing point and a high ionic conductivity of 1.7 mS cm–1 at −40 °C. Based on multiperspective theoretical simulations and tailor-made in situ cooling Raman characterizations, it has been demonstrated that substituting weak H-bonds with strong H-bonds facilitates the structural reshaping of Zn2+ solvation and remodeling of the H-bond network in the electrolyte. Endowed with this advantage, reversible and stable Zn plating/stripping behaviors could be realized at −40 °C, and the full cells display a high discharge capacity (200 mA h g–1) at −40 °C with ∼75% capacity retention after 1000 cycles. This study will expand the design philosophy of antifreezing aqueous electrolytes and provide a perspective to promote the adoption of Zn metal batteries for cryogenic environment large-scale energy storage.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yu Han,Qiang He,Yuqun Fang,Jingkai Nie,Weinan Qin,Hao Liu,Kai Zhu
Phase change materials (PCMs) offer great potential for realizing zero-energy thermal management due to superior cold storage and stable phase change temperatures. However, the widespread use of PCMs is consistently impeded by issues such as liquid leakage and solid rigidity. Here, we present a simple yet effective strategy for developing highly flexible polymer-based phase change materials. Our approach involves creating a dual three-dimensional (3D) cross-linked network of acrylamide (AM) and sodium alginate (SA) within a poly(vinyl alcohol) (PVA) matrix. The synergy between H-bonds and AM-SA networks significantly enhances the mechanical strength, thermal stability, and leakage resistance of PVA@AM-SA. Our research offers a promising approach to designing phase change materials with both high latent heat capacity and exceptional mechanical strength, making them ideal for use in wearable thermal management applications.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chen Cai,Jiayin Chen,Wei Fu,Shuying Ning,Hao Zhou,Muhammad Kashif,Yaxin Su
The Ce-modified OMS-2 catalyst (Ce x -OMS-2) was synthesized by the hydrothermal synthesis method, after which its catalytic efficacy in the selective reduction of NO by CO was assessed. The experiments showed that Ce 0.08 -OMS-2 was capable of 100% NO conversion between 175 and 300 °C when 0.05%NO, 0.1%CO, 5%O 2 and N 2 were used as equilibrium gases, and the N 2 selectivity peaked at 93.2% at 175 °C. Additionally, Ce 0.08 -OMS-2 exhibits good sulfur resistance in the presence of 0.02% SO 2 and maintains more than 88% NO conversion at 175–275 °C. By using BET, XPS, H 2 -TPR, NH 3 -TPD, and In situ DRIFTS to characterize the catalysts, the effects of doping the active metal Ce on the physicochemical characteristics of OMS-2 catalysts were under investigation. In conclusion, the improvement of the low-temperature activity of the Ce x -OMS-2 catalyst is facilitated by lower agglomeration and crystallinity , larger specific surface area, smaller average pore size, enhanced surface oxygen vacancies, increased Mn 4+ concentration, and richer Brønsted acid. Reaction gas adsorbed species and intermediates on the catalyst surface were dynamically captured during In situ DRIFTS experiments. The CO-SCR reaction of the catalyst was found to follow the E-R mechanism below 200 ℃ and the L-H mechanism at 200–350 ℃.
研究领域:
环境科学
·
催化化学
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Kaifu Lin,Jiawei Wang,Shujie Qiao,Zhiyong Guo
As one of the most direct methods to construct molecular scaffolds in fine chemicals, C–H bond oxidation is a hot research area in catalysis. One-dimensional covalent organic frameworks (1D-COFs) developed recently have attracted growing attention for catalytic applications owing to their unique edge microstructure. Herein, a novel crystalline 1D-COF (FZU-66) was constructed and further decorated with cobalt(II), which led to excellent heterogeneous catalytic performance in the C–H bond oxidation of ethylbenzene. In an aqueous solution at room temperature within 16 h, the conversion is nearly 100%, while the acetophenone selectivity is around 99%. More impressively, the designed single-dispersed cobalt(II)-coordinated 1D-COF (FZU-66-Co) retained good catalytic activity while maintaining high crystallinity after at least five consecutive recycling experiments. This work will prompt the application of porous polymers in the catalyzed oxidation of C–H bonds and make it an efficient and sustainable platform for activating C–H bonds of aromatic hydrocarbons.
研究领域:
催化化学
·
材料科学
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高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Libin Wang,Ting Shu,Songtao Guo,Shi Chen,Yingjun Jiang,Xianluo Hu
ABSTRACT Owing to sluggish ionic mobility at low temperatures, supercapacitors , as well as other energy-storage devices, always suffer from severe capacity decay and even failure under extreme low-temperature circumstances. Solar-thermal-enabled self-heating promises an attractive approach to overcome this issue. Here, we report a unique H-bonding charge-transfer complex with a high photothermal conversion efficiency of 79.5% at 405 nm based on chloranilic acid and albendazole . Integrated with a microsupercapacitor, the chloranilic acid-albendazole complex (CAC) film prompts an apparent temperature increase of 22.7 °C under 1 sun illumination at −32.6 °C, effectively elevating the working temperature of devices. As a result, the rate capability of the microsupercapacitor has been significantly improved with a 17-fold increase in capacitance at a current density of 60 μA cm −2 , leading to outstanding low-temperature performances. Importantly, the integrated device is capable of working at a low temperature of −30 °C in the open air, which demonstrates the potential of CAC in practical applications for low-temperature ultracapacitive energy-storage devices.
研究领域:
材料科学
·
能源存储技术
·
光电化学
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Zhijun Liu,Junxiang Lu,Meng Xu,Shaochun Li,Anjie Zhou,Yongjuan Geng,Sai Zhang
This study presents the development of h-BN/PDMS composite coatings through hydroxylation treatment and modification of hexagonal boron nitride (h-BN) using a vinyl silane coupling agent. The study aims to address the limitations of conventional PDMS coatings, specifically their inadequate mechanical strength and poor resistance to weathering. The innovation lies in the improved dispersion of h-BN within the PDMS matrix, which was achieved via the surface grafting of vinyl groups. This approach, combined with the intrinsic layered structure and high thermal conductivity of h-BN, led to a synergistic enhancement in the mechanical performance and protective functionality of the coating. Experimental results demonstrated that incorporating 8% modified h-BN increased the tensile strength of the coating to 5.206 MPa, an improvement of 110.6% over pure PDMS, and reduced erosion depth to 2.7 μm. Furthermore, the coating exhibited minimal adhesive strength loss after UV aging (from 1.085 to 1.012 MPa). Under acidic conditions (pH = 2), the composite coating reduced the mortar strength loss by 53.1%. In seawater immersion and 25 freeze-thaw cycles, the mass loss rates of the test blocks decreased by 55.9% and 90.4%, respectively. In addition, the high UV reflectance (97.6%) and oxygen barrier properties of h-BN significantly mitigated the photo-oxidative degradation of the PDMS matrix. This study proposes a theoretical foundation and process optimization strategy for designing high-performance protective coatings suitable for use on concrete and electronic components in extreme environments.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·
IF 4.3
Yuan-Yang Guo,Ze-Hua Tian,Yu-Chen Han,Dandan Ma,Tianju Shao,Zhiyong Jiang
Graphical Chemically stable Hantzsch ester is discovered to be an efficient and economical NAD(P)H mimic as sacrificial electron source in in vitro bioconversions. Biocatalysis has emerged as a valuable and reliable tool for industrial and academic societies, particularly in fields related to bioredox reactions. The cost of cofactors, especially those needed to be replenished at stoichiometric amounts or more, is the chief economic concern for bioredox reactions. In this study, a readily accessible, inexpensive, and bench-stable Hantzsch ester is verified as the viable and efficient NAD(P)H mimic by four enzymatic redox transformations, including two non-heme diiron N -oxygenases and two flavin-dependent reductases. This finding provides the potential to significantly reduce the costs of NAD(P)H-relying bioredox reactions.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Peng Chu,Lindong Ma,Hongli Liu,Zongwei Zhang,Yuhao Liu,Weiqiang Xie,Wenshuo Cao,Mingwei Li,Yuanhang Zhou
Aluminum borate fibers are promising candidates for high-temperature thermal insulation owing to their excellent thermal stability, good chemical resistance, and relatively low density. Herein, we report a simple method for preparing porous Al 18 B 4 O 33 /h-BN composite fibers via electrospinning and stepwise heat treatment, using an aluminum isopropoxide/aluminum nitrate (AIP-AN) complex as the aluminum source and nanoscale h-BN as the boron source. The incorporation of h-BN not only promotes the in-situ formation of the Al 18 B 4 O 33 phase but also affects the fiber's pore structure. Meanwhile, the heterogeneous interface formed between h-BN and the Al 18 B 4 O 33 may introduce additional interfacial thermal resistance, thereby synergistically reducing thermal conductivity and improving thermal insulation performance. The resulting composite fibers exhibited a highly porous structure, with a high specific surface area of 53.9175 m 2 g −1 , a low density of 0.025 g cm −3 , and a low thermal conductivity of 0.0417 W m −1 K −1 . The porous Al 18 B 4 O 33 /h-BN composite fibers demonstrate significant potential for thermal insulation in extreme environments, offering a viable approach to developing high-performance ceramic fiber insulation materials.
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