Surfaces and Interfaces
·
2025
·
IF 6.3
Mihong Cao,Lucheng Li,Wenfeng Yuan,Jun Chen
In order to solve the problems of insufficient adsorption electrolyte capacity and small specific surface area caused by the smooth surface and few pores of Super P spherical conductive particles, this work uses concentrated sulfuric acid (H 2 SO 4 ) for surface etching of Super P conductive particles to explore the influence of different etching time on the micromorphology of SP conductive agent and the behaviors of LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM-523) batteries. After etched by concentrated H 2 SO 4 , the surface of SP conductive agent changes from “capillary” structure to fluffy “plush” structure, effectively improving the conductivity specific surface area of the conductive agent particles. Compared with the pristne SP-0H conductive agent, the batteries using 1.5% of concentrated H 2 SO 4 etched SP-1H, SP-2H and SP-20H conductive agent have smaller EIS impedance value, larger area of CV curves, and smaller potential difference of the redox peaks. As a result, the initial charging/discharging capacities of SP-1H, SP-2H and SP-20H conductive batteries were 178.7/183.0, 187.6/183.9, 178.9/180.8 mAh/g with corresponding ICE of 102.4%, 98.0% and 101.1% respectively, which were much higher than the pristine SP-0H conductive battery (182.0/173.7 mAh/g with ICE of 95.4%). In addition, the SP-1H, SP-2H and SP-20H batteries also show significantly improved cycle performance and rate cycle capabilities, showing more superior comprehensive behaviors, which can provide a new modification insights for the exploration of new conductive agent in NCM-523 of high-performance lithium ion batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yuci Xin,Yong Wu,Xingan Dong,Yuhan Li,Zhenxiang Cheng,Jianli Wang,Xiaolong Guo,Peng Yu
Amorphous electrocatalysts display several unique advantages in electricity-driven water splitting compared to their crystalline analogs, but understanding their structure–activity relationships remains a major challenge. Herein, we show that the d- and p-electronic states of amorphous Ni-Fe-B can be subtly manipulated by varying the Ni and Fe contents. The optimal Ni-Fe-B alloy exhibits a high performance in the oxygen evolution reaction (OER), as supported by its impressive stability (no clear degradation after 100 h) and considerably lower overpotential compared to those of its crystalline analogs. Based on theoretical calculations, different Ni and Fe contents can cause significant shifts in the d-band levels of Ni and Fe and the p-band level of B, thus altering the OER activity. Additionally, the energy difference between the d- and p-band centers (ΔE ad-p ) may be an effective index for use in reflecting the structure–activity relationship of an amorphous Ni-Fe-B alloy in the OER. An amorphous Ni-Fe-B alloy with a smaller ΔE ad-p displays a higher intrinsic activity. This study supplies a unique direction for use in constructing the structure–activity relationships of amorphous electrocatalysts by revealing the role of ΔE ad-p , which promotes fundamental research and the practical application of amorphous electrocatalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Huanhui Zhan,Ju Liu,Ping Wang,Chenfei Wang,Zhongguo Wang,Muhua Chen,Xinbao Zhu,Bo Fu
In the field of building energy conservation , the development of biodegradable biomass aerogels with excellent mechanical performance, flame retardancy and thermal insulation properties is of particular importance. Here, a directional freeze-drying method was used for fabricating composite sodium alginate (SA) aerogels containing functionalized ammonium polyphosphate (APP) flame retardant . In particular, APP was coated with melamine (MEL) and phytic acid (PA) by a supramolecular assembly process. Through optimizing the flame retardant addition, the SA-20 AMP sample exhibited excellent flame retardant and thermal insulation properties, with the limiting oxygen index of 38.2 % and the UL-94 rating of V-0. Such aerogels with anisotropic morphology demonstrated a low thermal conductivity of 0.0288 (W/m·K) in the radial direction (perpendicular to the lamellar structure). In addition, as-obtained aerogels displayed remarkable water stability and mechanical properties, indicating significant potential for practical applications.
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PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Penglun Zheng,Haihan Zhao,Yawei Meng,Junwei Li,Qizhao You,Quanyi Liu
Epoxy resin (EPs) coatings for aircraft need to have good flame retardant properties and toughness. On the other hand, to meet the needs of sustainable development, EPs also have high environmental friendliness and low cost requirements. In light of this, a one-pot approach was used to create a bio-based phosphorus‑nitrogen synergistic flame retardant (MDV) employing DOPO, vanillin, and MA as raw materials. The results showed that MDV can give EP superb flame retardancy and toughness. With the addition of 3 wt% MDV, the tensile and flexural strengths of EP composites increased by 13.6 % and 14.5 %, respectively, and the impact strength increased from 13.9 KJ/m 2 to 43.1 KJ/m 2 . The excellent toughness enhancement comes from the fact that the structure of MDV itself can preferentially consume and dissipate energy when counteracting external impacts. In addition, MDV/EP also has excellent flame retardant properties, showing good self-extinguishing capability off fire in tests. Compared with pure EP, the total heat release (THR) and peak heat release rate (PHRR) of 7-MDV/EP composites were reduced by 45.3 % and 64.5 %, respectively. Mechanistic analyzes showed that the segregation of the condensed phase and the gas-phase flame-retardant effect both originated from the P/N synergistic effect, which was the source of the excellent flame-retardant effect of MDV/EP.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fanjun Yu,Zhichen Ba,Zhizun Gao,Yonggui Wang,Yanjun Xie,Haigang Wang,Zhe Qiu,Zefang Xiao
The development of effective and eco-friendly wood-based functional composites is crucial for maximizing the value of forest resources. In this paper, we propose a novel method for preparing an aqueous-phase flame retardant (MPUC) using carboxymethylation alkali lignin, phytic acid, and melamine-urea-glyoxal resin. This approach aims to manufacture modified wood (MW/MPUC) with exceptional flame-retardant and smoke-suppressing properties. The results from the cone calorimeter test indicate that the modified wood achieved a remarkable reduction of up to 56.8 % in total heat release and an impressive 92.3 % decrease in total smoke production. Furthermore, the limiting oxygen index increased significantly from 23.6 % (natural wood) to 41.5 % (MW/MPUC-2). Notably, all modified wood successfully passed the V-1 test for UL-94 flammability rating. Further, our investigation into the gas-phase products formed during pyrolysis and the condensed-phase system created after combustion has led us to propose potential flame-retardant mechanisms for these flame retardants. Moreover, modified wood had improved mechanical properties and dimensional stability than natural wood. In addition, we extended the application of MPUC-2 flame-retardant to other flammable materials and demonstrated its excellent flame-retardant properties. Thus, the proposed strategy provided a new approach for preparing wood-based flame-retardant composites with lignin-based N-P flame retardants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jian Yu,Jianfei Xiao,Yuan Wang,Tian C. Zhang,Ji Li,Ge He,Shaojun Yuan
Biomass-derived carbon aerogels have attracted considerable attention for applications in CO 2 capture and supercapacitors (SCs). However, these carbon aerogel materials often suffer from an insufficient number of active sites. In this study, a novel N, P co-doped porous carbon aerogel with a hierarchical structure was synthesized using cellulose biomass as the raw material, a NaOH/urea system as the solvent and activator, and urea and urea phosphate as heteroatom dopants. Owing to the synergistic effects of heteroatom co-doping and the hierarchical pore structure, the optimal sample, NPCA-600–0.5, exhibited a large specific surface area of 582.9 m 2 /g and a high pore volume of 0.187 cm 3 /g. It demonstrated a CO 2 adsorption capacity of 2.89 mmol/g (25 °C, 1 bar), along with high CO 2 /N 2 selectivity and excellent recyclability, retaining 91 % efficiency after 10 cycles. As a SC electrode, NPCA-600–0.5 achieved a high specific capacitance of 238 F/g at 1 A/g, maintaining 80 % of its initial capacitance after 5000 cycles at 10 A/g. This work not only provides a promising adsorbent and electrode material for CO 2 capture and supercapacitors, but also offers valuable insights for the design of advanced carbon-based materials.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Tianyu Shen,Yuanxinyi Zhou,Dong Wu,Hongyu He,Aijuan Xie,Shiping Luo
In this study, a rapid and sensitive electrochemical sensor (ZnCo 2 O 4 @NC) based on metal-organic frame (MOF)-derived metal oxide material (ZnCo 2 O 4 ) and chitosan derived nitrogen-doped carbon material (NC) was successfully constructed for the simultaneous determination of acetaminophen (APAP) and p-aminophenol (PAP). A series of electrochemical experiments proved that the MOF derived ZnCo 2 O 4 @NC composite has excellent electrochemical response to APAP and PAP in the phosphate buffer saline (PBS) (pH 7.0). The current response varies linearly with the increase of APAP concentration in the range of 8.0 μmol L −1 to 520 μmol L −1 and PAP concentration in the range of 6.0 μmol L −1 to 420 μmol L −1 . The sensitivity and limit of detection (LOD) of ZnCo 2 O 4 @NC for APAP and PAP detection are 0.1024 and 0.2749 μA μmol L −1 cm −2 , 0.0608 and 0.2489 μmol L −1 , respectively. The ZnCo 2 O 4 @NC composite modified electrode exhibits good selectivity, reproducibility and stability. Additionally, in the detection for acetaminophen sustained-release tablets, the recovery rates of APAP are in the range of 90.00 % –100.00 %. The theoretical content is consistent with our detection results, showing that this method has good accuracy in actual sample analysis. This study provides an innovative idea to improve electrochemical performance of simultaneous detection of acetaminophen and p-aminophenol through the comprehensive strategy of structural design, heteroatom doping.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanming Wang,Ruijie Guo,Jie Zhang,Huifang Wang,Baolong Niu,Hong Yan
In general, the addition of flame retardants may lead to the degradation of the mechanical properties of polymers, despite enhancing their flame retardancy. However, flame-retardant coatings have the potential to provide good flame resistance to polymers without compromising their inherent mechanical properties. In this study, we applied highly adhesive and flexible polysiloxane flame-retardant coatings (196 μm) to polypropylene , resulting in reductions of 74.9 %, 58.0 %, 80.0 %, and 56.4 % in peak heat release rate , peak smoke production rate, fire growth rate, and mass loss, respectively. By incorporating the lab-synthesized DOPO-modified polysiloxane (APID), the flame-retardant efficiency of ammonium polyphosphate (APP) was greatly enhanced. The primary film-forming agent, (3-aminopropyl) triethoxysilane (APTES), played a key role in maintaining the compatibility of APP and APID with the coating, as well as facilitating the formation of a robust Si O Si crosslinked network structure that strengthened the resulting char layer. The interactivity between the various components, including hydrogen bonds and crosslinked network structures, contributed to improved uniformity, thermal stability, and adhesion of the coatings. Moreover, the coatings exhibited resistance to ultraviolet radiation and water. Our findings suggest that highly flexible and adhesive flame-retardant coatings hold significant potential for applications in polymer protection. These promising results provide a viable pathway for improving the fire protection of polymers through the use of high-adhesive intumescent flame-retardant coatings.
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COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 4
·745-752
·
IF 1.967
Wang Jianying,Ma Xiaofei,Wei Lai,Zhu Xiang,Zhu Yuhua,Wang Gang,Mei Tao,Li Jinhua,Wang Xianbao
A novel kind of p(HEMA-co-AA) fluorescent hydrogels with high strength are first generated through one-step photopolymerization of 2-hydroxyethyl methacrylate (HEMA), acrylic acid (AA), and HEMA-modified carbon dots (HMCDs). Herein, HMCDs are used as new nontoxic fluorescent crosslinking centers. The novel HMCDs-based fluorescent hydrogels not only display stable photoluminescence, but have high mechanical strength. The fluorescent properties of the HMCDs-based hydrogel films are similar as that of CDs solution and stable for a prolonged duration. Besides, the fluorescent intensity of HMCDs-based hydrogels can be changed by controlling the HMCD content. The tensile strength of the fluorescent hydrogels with 1 wt% HMCD content can reach up to ~ 12 MPa, higher than that of the conventional hydrogels. More importantly, the mechanical properties can be adjusted by changing the water content and HMCD content. The enhanced mechanical strength is probably attributed to the relatively ordered hierarchical microstructure.
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Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 8
·944-949
·
IF 3.692
Shuai Hao,Ninghua Chen,Qin Liu,Ying Xie,Honggang Fu,Yingchun Yang
Graphical Take a Ni : NiO@Ni-P nanosheet arrays behave as efficient electrocatalyst benefiting from the synergistic effect between NiO and Ni-P. As a durable 3D catalytic electrode for oxygen evolution reaction, NiO@Ni-P/Ti exhibits a high activity achieving a geometrical catalytic current density of 10 mA cm −2 at an overpotential of 292 mV in 1.0 m KOH. Cost-effective and highly-efficient electrocatalysts for the oxygen evolution reaction are crucial for electrolytic hydrogen production. Here, we report core–shell NiO@Ni-P nanosheet arrays as a high-performance 3D catalyst for water oxidation electrocatalysis. Such nanoarrays demand overpotentials of 292 and 350 mV to drive geometrical catalytic current densities of 10 and 100 mA cm −2 , respectively, with an activity superior to its NiO and Ni-P counterparts. Notably, this catalyst also shows a high long-term electrochemical durability with a Faradaic efficiency of 98.1 %. Density functional theory calculation reveals that the superior activity benefits from the synergistic effect between NiO and Ni-P.
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Asian Journal of Pharmaceutical Sciences
·
2025
·
IF 11.9
Zhiyuan Tang,Yuening Sun,Quanhua Yi,Qian Ding,Yang Ding,Jianfei Huang
The effective intracellular accumulation of doxorubicin (DOX) is crucial for improving antitumor efficacy, which is severely impeded by limited drug penetration, uncontrollable drug release, and drug resistance. In this study, a thermal-deformative polymer embedding ultrasmall ceria (CeO 2 ) was rationally designed for deep tumor drug shuttling and hypoxia reversal to improve chemotherapy. Structurally, the CeO 2 nanozyme was covalently grafted with a polymer of p(NIPAM-co-AM) that could sharply shrink for DOX loading, which was consolidated with polydopamine (PDA) film encapsulation. Thereafter, a tumor penetration guide of apolipoprotein A-I (apoA-I) conjugated iRGD peptide (apoA-I-iRGD) was further decorated onto the PDA shell via Michael addition for preparing CeO 2 P/DOX@iAPDA. With the aid of apoA-I-iRGD, CeO 2 P/DOX@iAPDA penetrated both the tumor spheroids (∼78 μm) and the tumors of the mouse model deeply. After internalization by tumor cells and triggering by low pH in lysosomes, rapid DOX release was achieved by peeling off the PDA shell and thermosensitive deformation of p(NIPAM-co-AM). CeO 2 P/DOX@iAPDA provided 66.4% tumor suppression in 4T1-derived tumor spheroids and 63.2% in 4T1-tumor-bearing mice, respectively. Preliminary mechanistic research involving western blotting and immunohistochemistry revealed that CeO 2 P/DOX@iAPDA reversed resistance through the through HIF-1α-P-gp/lipid axis. Collectively, this study intelligently integrated CeO 2 nanozymes, temperature-sensitive polymers, and imitated biochemical modifications to improve chemotherapy for breast cancer.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Lai Liu,Ye Tian,Jiangang Yu,Huizhen Yao
Copper zinc sulphide (CZS) due to high conductivity, fast photoresponse and good stability has attracted rising attention in optoelectronic field. Constructing heterojunctions with rational energy bands alignment can accelerate carrier separation to improve the performance of CZS-based photoelectric device. Herein, p-CZS/n-TiO 2 core-shell nanorods heterojunction film was successfully fabricated for the first time. CZS nanoparticles (NPs) were directly loaded on the surface of TiO 2 nanorods (NRs) through a simple chemical bath deposition. Photoelectrochemical (PEC) photodetector based on CZS/TiO 2 composite film was designed and interfacial charge kinetics has also been investigated. The CZS/TiO 2 PEC device exhibits fast response speed of 95/56 ms, high responsivity of 7.1 mA W -1 and detectivity of 5.6 × 10 12 Jones at a bias voltage of 1 V. The light on/off ratio of self-powered CZS/TiO 2 PEC device achieves 5.6 × 10 3 , nearly 30.4 times higher than bare CZS PEC device. Furthermore, the photodetection performance of the CZS/TiO 2 PEC device can be effectively regulated by light power density and environment conditions, promoting its adaptability in multifarious practical applications. The findings suggest that CZS/TiO 2 heterostructure film devices have great potential for high-performance and energy-efficient PEC photodetectors.
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