ADVANCED ENGINEERING MATERIALS
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2024
·
IF 3.4
Fei Chen,Chengbao Liu,Leizhi Zheng,Feng Chen,Junchao Qian,Yongbin Qiu,Xianron Meng,Zhigang Chen
Nickel hydroxide (Ni(OH) 2 ) is recognized as a promising material for electrodes in supercapacitors owing to its exceptional theoretical specific capacitance. However, Ni(OH) 2 has several drawbacks, including a short cycle life, susceptibility to volume expansion, and poor electrical conductivity. In this work, Ni(OH) 2 nanosheets anchored on layered g-C 3 N 4 /C (Ni(OH) 2 –g–C 3 N 4 /C) are designed by biological template induction and a hydrothermal method. Ni(OH) 2 –g–C 3 N 4 /C has unique petal-like structures, which can provide a vertical charge transport channel to increase reaction potential of the material during the charge–discharge process. The introduction of biomass carbon can solve the problem of the bulk phase accumulation of g-C 3 N 4 and can also improve the overall conductivity of the composite. Compared to Ni(OH) 2 (522 F g −1 ), g-C 3 N 4 /C (76.2 F g −1 ), and g-C 3 N 4 (16 F g −1 ), the Ni(OH) 2 –g–C 3 N 4 /C-0.75 (NGC-0.75) composite exhibits the highest specific capacitance of 1034 F g −1 at 1 A g −1 . Furthermore, after 5000 cycles at 5 A g −1 , the capacitance of the material is maintained at 85.97%. Meanwhile, the asymmetric supercapacitor based on the NGC-0.75 shows a high energy density of 18.29 Wh kg −1 at the power density of 400.02 W kg −1 with excellent cyclic stability of 127.45% over 10 000 cycles.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Meng Jiashen,Hong Xufeng,Xiao Zhitong,Xu Linhan,Zhu Lujun,Jia Yongfeng,Liu Fang,Mai Liqiang,Pang Quanquan
Molten salt aluminum-sulfur batteries are based exclusively on resourcefully sustainable materials, and are promising for large-scale energy storage owed to their high-rate capability and moderate energy density; but the operating temperature is still high, prohibiting their applications. Here we report a rapid-charging aluminium-sulfur battery operated at a sub-water-boiling temperature of 85 °C with a tamed quaternary molten salt electrolyte. The quaternary alkali chloroaluminate melt – possessing abundant electrochemically active high-order Al-Cl clusters and yet exhibiting a low melting point – facilitates fast Al 3+ desolvation. A nitrogen-functionalized porous carbon further mediates the sulfur reaction, enabling the battery with rapid-charging capability and excellent cycling stability with 85.4% capacity retention over 1400 cycles at a charging rate of 1 C. Importantly, we demonstrate that the asymmetric sulfur reaction mechanism that involves formation of polysulfide intermediates, as revealed by operando X-ray absorption spectroscopy, accounts for the high reaction kinetics at such temperature wherein the thermal management can be greatly simplified by using water as the heating media.
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Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Zhaoshun Liu,Junli Xu,Fang Zhang,Lu Ji,Jiaxin Yang,Zhongning Shi
High-entropy materials have received increasing attention due to their unique physicochemical characteristics and remarkable properties for oxygen evolution reaction (OER). The synthesis of high-entropy metal phosphides (HEMPs) has rarely been reported owing to the incompatibility between different metal ions and phosphorus. Herein, the phosphorus vacancies (Pv) enriched N-doped C HEMPs (N-C@CoNiMnCuFeP/NF) for OER were prepared by a facile ZIF-derived phosphide method. Abundant Pv and amorphous structures increase the active sites and modulate the electronic structure of electrocatalyst to improve the OER performance. Besides, the synergistic effect among the metallic elements is beneficial for enhancing the electrocatalytic activity. Accordingly, HEMP-450 shows outstanding catalytic performance with the overpotential of 199 mV and continuously reacts for 140 hours without performance degradation for OER at 100 mA cm −2 . This work demonstrates a simple template strategy for reasonably preparing HEMPs electrocatalyst with rich Pv.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Jiaojiao Ding,Tiexiang Gao,Songlin Liu,Zhezhe Li,Baifei Hu,Junping Zhen,Xiaowei Yao,Hongtao Liu,Haiming Hu
Epimedin C, an anti-cardiovascular disease natural compound derived from Herba Epimedii , exhibits low oral bioavailability, with its metabolism closely related to the gut microbiota. In this study, we investigated the roles of intestinal bacteria in the catabolism of epimedin C. We discovered that a strain of Parabacteroides distasonis QZH 1201 ( P. distasonis ) from human fecal samples can convert epimedin C to 2”-O-rhamnosylicariside II and baohuoside I. More importantly, we identified an α-L-rhamnosidase enzyme from P. distasonis (PdRha), which plays a crucial role in this process by efficiently transforming epimedin C into icariside I. PdRha showed optimal activity at pH 6 and a temperature of 50 °C. Under the condition that the final concentration of epimedin C was 0.5 mM, its conversion efficiency reached 78.72 %. Additionally, we investigated the substrate profile of PdRha and discovered that it can hydrolyze rutin, naringin, and icariin, releasing isoquercitrin, prunin, and icariside I. Molecular docking was performed to gain insights into the enzymatic mechanism. This study provides valuable insights into how a common intestinal symbiotic bacterium processes an important natural flavonoid.
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Chemistry-An Asian Journal
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2024
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IF 3.5
Yicheng Wang,Qiyu Zhang,Chenxu Wang,Ayeza,Yating Zhang,Chao Hu
The utilization of renewable energy for electrocatalytic carbon dioxide reduction reaction (CO 2 RR) represents a pivotal technology in sustainable carbon conversion. Single-atom catalysts (SACs) featuring transition metal-nitrogen-carbon (M−N−C) structures have demonstrated exceptional electrocatalytic efficacy in CO 2 RR by maximizing atom efficiency. Nevertheless, further investigation is warranted to optimize the catalytic performance of SACs through the selection of suitable carbon sources and supports, as well as the modulation of the microenvironment surrounding individual metal atoms. In this study, a sulfur-doped Ni−N−C catalyst was prepared using a two-step strategy involving metal ion adsorption and thermal decomposition, with porous ion exchange resin serving as the carbon source. Due to the uniform distribution of single atom active centers on the resin-based carbon support and sulfur doping, this catalyst efficiently converts CO 2 into CO with a Faradaic efficiency exceeding 90 % within the range of −0.69~−1.29 V (vs. RHE), reaching a maximum value of 97.7 % (−0.79 V vs. RHE). Theoretical calculations indicate that second-shell sulfur doping effectively promotes coupled transfer of protons and electrons, leading to a significant reduction in Gibbs free energy barriers for CO 2 RR intermediate products.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinli Ye,Haiyang Zhang,Hao Yu,Jianqing Xu,Shan Li,Xiaomin Ma,Wei Xu,Junxiong Zhang
High-performance SiC aerogels are sought after for their superior thermal insulation and absorption properties, especially in applications such as electromagnetic stealth for aero engines and high-temperature radar stealth. However, achieving SiC aerogel with both temperature resistance and strong wave absorption while controlling their properties remains a significant challenge. This study investigates the influence of reactant concentrations on the structure, thermal insulation, and absorption performance of SiC aerogels synthesized via the sol-gel method. The aerogel synthesized with a n(C):n(Si) ratio of 1:2 showed superior thermal insulation. Additionally, it showed excellent electromagnetic wave absorption, with a minimum reflection loss of −53.80 dB at 6.16 GHz and a maximum effective absorption bandwidth of 3.10 GHz at a thickness of 2.40 mm. Furthermore, the maximum compressive strength of C/SiC@SiC reached 0.98 MPa, a notable improvement of 81.48 % compared to the pristine C/SiC matrix. The maximum effective absorption bandwidth of C/SiC@SiC was increased to 6.06 GHz at 2.35 mm, and the surface center temperature decreased from 183.1 °C for C/SiC to 130.1 °C for C/SiC@SiC. Overall, this study offers valuable insights into the development of advanced absorption and thermal insulation materials, providing a foundation for further research and innovation in this field.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Xu Xian,Lan Ling,Xu Jiangong,Liang Zheng,Tan Jin,Wang Haiyong,Qiu Songbai
The development of biodegradable materials from biomass is a crucial strategy for leveraging biomass resources. A key component in this process is 2,5-bis(hydroxymethyl)furan (BHMF), a significant biomass-derived platform chemical. However, producing BHMF with high selectivity through the selective hydrogenation of 5-hydroxymethylfurfural, while avoiding the creation of unwanted byproducts, is a complex challenge. In our research, we have developed a novel catalyst featuring a magnetic core. This catalyst, which consists of platinum loaded onto a graphene-like shell, has been applied to the catalytic hydrogenation of HMF in an aqueous environment. Under the optimized conditions of 373 K, 3 MPa H 2 , and 1 h reaction time, a BHMF yield exceeding 99% was achieved. This method presents a promising and effective approach for the high-value conversion of biomass waste into polymer materials and pharmaceutical chemicals. Graphical Abstract
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-16
·
IF 5.3
Meng Jingjing,Han Lu,Li Lu,Yin Xue-bo,Zheng Jing
Manganese dioxide (MnO 2 )-based heterogeneous catalysts have gained significant attention in nanozyme research due to their exceptional oxidase-mimicking capabilities. This work reports the rational design of MnO 2 functionalized magnetic carbon nanotubes (Fe 3 O 4 @C@MnO 2 ) through a multistep synthesis strategy. The magnetic N-doped hollow carbon substrate (Fe 3 O 4 @C) was first synthesized via controlled pyrolysis of FeOOH-coated polydopamine precursors. Subsequent interfacial redox reaction with KMnO 4 enabled the in situ deposition of ultrathin MnO 2 nanosheets on the nanotube substrate, forming a triple-component coaxial architecture. This hollow structure not only facilitates dense MnO 2 deposition but also maintains robust magnetic responsiveness. The obtained Fe 3 O 4 @C@MnO 2 exhibits remarkable enzyme-mimetic capability, catalyzing TMB chromogenic conversion with 0.92-fold enhanced catalytic performance relative to pristine MnO 2 . Systematic mechanistic studies reveal that tannic acid (TA) competitively inhibits ·OH radical generation via MnO 2 -TA complexation, while the carbon interlayer enhances electron transfer efficiency. Owing to the superior enzyme-mimetic performance of Fe 3 O 4 @C@MnO 2 and their inhibition effect by TA, a sensitive colorimetric biosensing assay was fabricated, achieving a TA detection limit of 0.029 μM with a 0.096–4.82 μM linear concentration range. This work exemplifies the synergy of structural engineering and component optimization in designing multifunctional nanozymes, showing potential applications in food quality monitoring, environmental analysis, and point-of-care diagnostics. Graphical
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Jie Yang,Lixia Ma,Yuqi Zhang,Xuqian Zhao,Shouren Zhang,Luo Huang,Yunpeng Fang,Xiaojie Zhou,Jianghao Kang,Ruibin Jiang
The design of low-cost and highly efficient bifunctional electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is challengeable, which limits the commercial application of rechargeable zinc-air battery. Herein, an efficient ORR and OER bifunctional electrocatalyst (NiFe-LDH/F x −FeN 4 /C) is composed of nickel/iron-based heterostructures sparsely grown on carbon black (CB) with single FeN 4 sites. The NiFe-LDH/F x − FeN 4 /C electrocatalysts are prepared through the pyrolysis of hemin chloride adsorbed on CB, followed by in-situ hydrothermal growth of NiFe-LDH/F x heterostructures. The NiFe-LDH/F x heterostructures are composed of NiFe-LDH, (NH 4 ) 3 FeF 6 , and NiF 2 . The elevated valence states of Fe and Ni in heterostructures significantly increase the OER activity. The mesopores and large pores of the NiFe-LDH/F x − FeN 4 /C facilitate the exposure of active sites and enhance mass transfer. These features contribute to the outstanding bifunctional activity of NiFe-LDH/F x − FeN 4 /C, achieving a half-wave potential of 0.906 V for the ORR, an OER overpotential of 246 mV at 10 mA cm −2 , and an extremely small voltage gap of 0.57 V. Additionally, the NiFe-LDH/F x − FeN 4 /C-based RZAB also exhibits a peak power density of 209 mW cm −2 and charging/discharging cycling stability for 445 h. This work establishes a novel strategy for the preparation of highly efficient bifunctional electrocatalysts through in-situ growth and heterostructure engineering.
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Nanoscale Advances
·
2025
·
IF 4.6
Shahzad Hussain,Resham Siddique,Muhammad Nadeem,Eman Zafar,Sadia Manzoor,Jawwad A Darr
The rapid advancement of highly integrated electronics demands next generation electromagnetic interference (EMI) shielding materials that combine lightweight, ultrathin, flexible, and mechanically robust properties with exceptional shielding effectiveness (SE) to mitigate signal crosstalk and ensure device reliability. In this work, we demonstrate the fabrication of high-performance EMI shields using highly conductive, additive-free aqueous Ti3C2Tx (T = O, OH, Cl, F) MXene dispersions synthesized under both harsh and mild etching conditions. These dispersions were engineered into freestanding thin films and functionalized cotton fabrics via vacuum-assisted filtration, enabling tunable EMI shielding properties through precise control of etchant chemistry, flake size, microstructure, thickness, and MXene loading. The EMI shielding improved with film thickness and the 13 μm thick film demonstrated exceptional EMI shielding of 60 dB. The freestanding heat treated Ti3C2Tx film with minimal thickness of 5 µm achieved a remarkable shielding effectiveness of 71 dB (which is 37% higher than the untreated film) corresponding to 99.99999% EMI attenuation. This film also exhibited an ultrahigh absolute shielding effectiveness (SSET) of 72,300 dB cm2 g−1, surpassing all previously reported MXene-based shields of comparable thickness. The improved stability was attributed to thermal conversion of surface OH groups to O-terminations, reducing interflake spacing and enhancing conductivity. The coated cotton fabric achieved an unprecedented SE of 82 dB due to the excellent wave attenuation associated with its porous structure. Notably, the fabric retained its shielding performance even after six months of ambient exposure, highlighting exceptional environmental stability. This study establishes critical structure-property relationships, revealing that induced porosity, meta-structure effects, large flake size, and optimized surface terminations synergistically enhance EMI shielding. By elucidating the interplay between material parameters and shielding performance, this work provides a foundational framework for designing advanced EMI mitigation technologies, paving the way for scalable, high-performance shielding solutions in next-generation flexible and wearable electronics.
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JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 7
·1-8
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IF 2.8
Liu Huiping,Sui Luyu,Luo Shilei,Wang Zixin,Xu Meng,Zhong Ming,Hou Haoqing,Peng Xinwen
Polyimide (PI) is very popular in polymer film capacitors due to its excellent performance and easy film-forming properties. However, its relatively low dielectric constant (approximately 3–4) limits its application and development in the field of high-performance capacitors. In general, dielectric constant can be enhanced effectively by adding special filler materials into polyimide. In this study, core–shell structured C@SiC nanoparticles were synthesized via a hydrothermal method. Novel polyimide composites (C@SiC/PI) were obtained by dispersing C@SiC nanoparticles into polyamic acid, followed by thermal imidization. The dielectric constant of C@SiC/PI composite material is as high as 40.2, which is 11.4 times that of pure PI. The maximal discharging energy density reached up to 2.49 J cm −3 with 10% C@SiC nanoparticles, which is almost 3 times higher than pure PI under identical conditions. Additionally, the composites have excellent thermal stability with a decomposition temperature of 5% above 530℃. The tensile strength of the composite film is in the range of 89.7–130.50 MPa, and the elongation at break is between 5.4% and 9.1%, maintaining good mechanical properties. Consequently, the fabricated composites hold significant promise for applications in polymer thin-film capacitors and flexible electronics.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Min Zhou,Ruru Xiong,Xuanxuan Wang,Huishuang Li,Lijuan Wang,Guixia Ling,Peng Zhang
Hyperpigmentation (HP) is mainly triggered by ultraviolet irradiation or local inflammation, and the free radicals generated by these two factors are the core inducers of various skin diseases. This study proposes a multipathway and highly efficient treatment strategy for melanin deposition. A microneedle (MN) system based on hydrolyzed collagen (HC) and polyvinylpyrrolidone (PVP) was designed to precisely deliver Chlamydomonas reinhardtii (C. reinhardtii) and potassium 4-MSK (C.r&4-MSK-MN) to skin tissues. C. reinhardtii contains unique antioxidant components such as arsenoproteins, polyunsaturated fatty acids (PUFAs), and algal polysaccharides, which distinguish it from other microalgae like Chlorella. In vitro free radical scavenging experiments show that at a concentration of 1 × 109 cells/mL, C. reinhardtii exhibits scavenging rates of 89.26%, 101.44%, and 103.57% against DPPH·, ABTS·+, and ·OH radicals, respectively. In addition, potassium 4-methoxysalicylate (4-MSK) can inhibit tyrosinase activity and promote skin metabolism. Therefore, C.r&4-MSK-MN has the following advantages: on one hand, C.r&4-MSK-MN successfully breaks through the skin barrier, directly delivering C. reinhardtii cells to the target site to scavenge free radicals and reduce the stimuli for melanin production. On the other hand, 4-MSK inhibits tyrosinase activity to reduce melanin synthesis and, at the same time, promotes skin metabolism to reduce melanin deposition on the skin surface, achieving multipathway reduction of melanin deposition. Experimental results showed that in animal models, C.r&4-MSK-MN significantly reduces the epidermal thickness of rats and substantially decreases melanin production. This research outcome not only provides a new strategy for the treatment of melanin deposition but also confirms that microalgae have potential application prospects in the fields of skin care (such as whitening and antiaging) and cosmeceuticals.
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