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Structure and electrochemical performance of delafossite AgFeO_(2)nanoparticles for supercapacitor electrodes

International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 201-213页

作者： Choulong Veann Thongsuk Sichumsaeng Ornuma Kalawa Narong Chanlek Pinit Kidkhunthod Santi Maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand SUT center of excellence on Advanced Functional materials Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Synchrotron Light Research Institute Nakhon Ratchasima 30000Thailand Department of Physics Universitas Negeri MalangMalang 65145Indonesia

Delafossite AgFeO_(2)nanoparticles with a mixture of 2H and 3R phases were successfully fabricated by using a simple co-precipitation *** resulting precursor was calcined at temperatures of 100,200,300,400,and 500℃to obtain the delafossite AgFe0_(2)*** morphology and microstructure of the prepared AgFeO_(2)samples were characterized by using field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),N_(2) adsorption/desorption,X-ray absorption spectroscopy(XAS),and Xray photoelectron spectroscopy(XPS)techniques.A three-electrode system was employed to investigate the electrochemical properties of the delafossite AgFeO_(2)nanoparticles in a 3 M KOH *** delafossite AgFeO_(2)nanoparticles calcined at 100℃(AFO100)exhibited the highest surface area of 28.02 m^(2)·g^(-1)and outstanding electrochemical performance with specific capacitances of 229.71 F·g^(-1)at a current density of 1 A·g^(-1)and 358.32 F·g^(-1)at a scan rate of 2 mV·s^(-1).This sample also demonstrated the capacitance retention of 82.99% after 1000 charge/discharge cycles,along with superior specific power and specific energy values of 797.46 W·kg^(-1)and 72.74Wh·kg^(-1),*** findings indicate that delafossite AgFeO_(2)has great potential as an electrode material for supercapacitor applications.

关键词： nanoparticles delafossite electrochemical properties X-ray absorption spectroscopy co-precipitation supercapacitor

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Optimization of CO_2 adsorption capacity and cyclical adsorption/desorption on tetraethylenepentamine-supported surface-modified hydrotalcite

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Journal of Environmental Sciences 2018年第3期30卷 293-305页

作者： Nutthavich Thouchprasitchai Nuthapol Pintuyothin Sangobtip Pongstabodee Department of Chemical technology Faculty of Science Chulalongkorn University center of excellence on petrochemical and materials technology Chulalongkorn University

The objective of this research was to investigate CO2adsorption capacity of tetraethylenepentamine-functionalized basic-modified calcined hydrotalcite（TEPA/b-c HT）sorbents at atmospheric pressure formed under varying TEPA loading levels,temperatures,sorbent weight to total gaseous flow rate（W/F）ratios and CO2concentrations in the influent *** TEPA/b-c HT sorbents were characterized by means of X-ray diffraction（XRD）,Fourier transform infrared spectrometry（FT–IR）,thermal gravimetric analysis（TGA）,Brunauer–Emmet–Teller（BET）analysis of nitrogen（N2）adsorption/desorption and carbon–hydrogen–nitrogen（CHN）elemental ***,a full 2~4factorial design with three central points at a 95%confidence interval was used to screen important factor（s）on the CO2adsorption *** revealed that85.0%variation in the capacity came from the influence of four main factors and the15.0%one was from their interactions.A face-centered central composite design response surface method（FCCCD–RSM）was then employed to optimize the condition,the maximal capacity of 5.5–6.1 mmol/g was achieved when operating with a TEPA loading level of 39%–49%（W/W）,temperature of 76–90℃,W/F ratio of 1.7–2.60（g·sec）/cm^3and CO2concentration of 27%–41%（V/V）.The model fitted sufficiently the experimental data with an error range of±1.5%.From cyclical adsorption/desorption and selectivity at the optimal condition,the 40%TEPA/b-c HT still expressed its effective performance after eight cycles.

关键词： CO2 capture Tetraethylenepentamine Calcined hydrotalcite Optimization

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CO_2 capture performance of bi-functional activated bleaching earth modified with basic-alcoholic solution and functionalization with monoethanolamine: isotherms, kinetics and thermodynamics

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Journal of Environmental Sciences 2016年第10期28卷 126-137页

作者： Sangobtip Pongstabodee Phuwadej Pornaroontham Nuthapol Pintuyothin Nuttapol Pootrakulchote Nutthavich Thouchprasitchai Department of Chemical technology Faculty of Science Chulalongkorn University center of excellence on petrochemical and materials technology Chulalongkorn University

CO2 capture performance of bifunctional activated bleaching earth （ABE） was investigated at atmospheric pressure. The sorbents were characterized by means of X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET）, Caron-Hydrogen-Nitrogen analysis （CHN）, Fourier transform infrared （FT-IR） and thermal gravimetric analysis （TGA）. The CO2 capacity was enhanced uia basic-modification and monoethanolamine （MEA） loading of the ABE sorbent to obtain a bifunctional surface property. Here, basic-modified calcined ABE with a 30 wt.% MEA loading （SAB-30） showed the highest CO2 capture capacity, but this was decreased with excess MEA loading （〉 30 wt.%）. At a 10% （V/V） initial CO2 concentration feed, the maximum capacity of SAB-30 increased from 2.71 mmol/g at 30~C {without adding moisture to the feed） to 3.3 mmol/g at 50℃ when adding 10% （V/V） moisture to the feed. Increasing the moisture concentration further reduced the maximum CO2 capacity due to the blocking effect of the excess moisture on the sorbent surface. However, SAB-30 could completely capture COg even in a 100% （V/V） initial CO2 concentration feed. A maximum CO2 capacity of 5.7 mmol/g for SAB-30 was achieved at 30℃. Varying the ratio of sorbent weight to total flow rate of the gas stream had no discernible effect on the equilibrium CO2 capture capacity. Avrami＇s equation and Toth＇s isotherm model provided a good fitting for the data and suggested the presence of more than one reaction pathway in the CO2 capture process and the heterogeneous adsorption surface of SAB-30. Thermodynamics studies revealed that CO2 capture on the bifunctional SAB-30 is feasible, spontaneous and exothermic in nature.

关键词： Carbon dioxideCaptureActivated bleaching earthBifunctional surface

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Effect of plating bath composition on chemical composition and oxygen reduction reaction activity of electrodeposited Pt–Co catalysts

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Rare Metals 2019年第2期38卷 95-106页

作者： Pranee Puangsombut Nisit Tantavichet Department of Chemical technology Faculty of ScienceChulalongkorn University center of excellence on petrochemical and materialstechnology Chulalongkorn University Research Unit of Advanced materials for Energy Storage Chulalongkorn University

Platinum–cobalt(Pt–Co) alloy electrocatalysts were prepared on pretreated carbon cloth by electrodeposition from different plating baths with the aim of finding suitable plating bath conditions that could control the chemical composition of the Pt–Co alloy electrodeposits over a wide range(from 0 to 100 at% Pt) and then to study the relationship of the deposit composition on the oxygen reduction reaction(ORR) electroactivity. The type of supporting electrolyte, the solution pH, Pt and Co concentrations of the plating bath and the current density used for electrodeposition all play a crucial role in the composition of the electrodeposited Pt–Co alloy. Pt contents in all the Pt–Co alloys deposited in H_2SO_4 are at a relatively high and narrow level(83 at%–97 at% Pt), regardless of the electrodeposition conditions used. While the Pt contents in the Pt–Co alloys deposited in Na_2SO_4 could reach a very low and broad level(5 at%–97 at% Pt), evidence of Co oxide formation is observed. Of the three supporting electrolytes studied, only NaCl effectively produces Pt–Co deposits over a wide range of compositions(8–90 at% Pt)by controlling the Pt and Co concentrations of the plating bath and using the high enough current density. The results show a qualitative correlation between Pt–Co deposit composition and ORR activity, where Pt–Co alloy catalysts with ≥ 45 at% Pt tend to yield higher ORR activities than the pure Pt catalyst, with the best ORR performance obtained from the Pt–Co alloy catalyst with 78 at% Pt.

关键词： Pt–Co alloy Electrodeposition Electrocatalyst Oxygen reduction reaction Proton exchange membrane fuel cell

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Nanoparticles for the treatment of spinal cord injury

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Neural Regeneration Research 2025年第6期20卷 1665-1680页

作者： Qiwei Yang Di Lu Jiuping Wu Fuming Liang Huayi Wang Junjie Yang Ganggang Zhang Chen Wang Yanlian Yang Ling Zhu Xinzhi Sun Department of Orthopedic Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Neurosurgery The First Affiliated Hospital of Chongqing Medical UniversityChongqingChina

Spinal cord injuries lead to significant loss of motor, sensory, and autonomic functions, presenting major challenges in neural regeneration. Achieving effective therapeutic concentrations at injury sites has been a slow process, partly due to the difficulty of delivering drugs effectively. Nanoparticles, with their targeted delivery capabilities, biocompatibility, and enhanced bioavailability over conventional drugs, are garnering attention for spinal cord injury treatment. This review explores the current mechanisms and shortcomings of existing treatments, highlighting the benefits and progress of nanoparticle-based approaches. We detail nanoparticle delivery methods for spinal cord injury, including local and intravenous injections, oral delivery, and biomaterial-assisted implantation, alongside strategies such as drug loading and surface modification. The discussion extends to how nanoparticles aid in reducing oxidative stress, dampening inflammation, fostering neural regeneration, and promoting angiogenesis. We summarize the use of various types of nanoparticles for treating spinal cord injuries, including metallic, polymeric, protein-based, inorganic non-metallic, and lipid nanoparticles. We also discuss the challenges faced, such as biosafety, effectiveness in humans, precise dosage control, standardization of production and characterization, immune responses, and targeted delivery in vivo. Additionally, we explore future directions, such as improving biosafety, standardizing manufacturing and characterization processes, and advancing human trials. Nanoparticles have shown considerable progress in targeted delivery and enhancing treatment efficacy for spinal cord injuries, presenting significant potential for clinical use and drug development.

关键词： antioxidants axon regeneration biocompatible materials drug carriers nanoparticles nerve regeneration neuroinflammatory diseases neuroprotection spinal cord injury stem cells

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Mechanical and wear properties of Al-Al_3Mg_2 nanocomposites prepared by mechanical milling and hot pressing

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International Journal of Minerals,Metallurgy and materials 2013年第3期20卷 290-297页

作者： A. Zolriasatein R.A. Khosroshahi M. Emamy N. Nemati Faculty of materials Engineering Sahand University of Technology center of excellence for High Performance materials School of Metallurgy and Materials University of Tehran

β-A13Mg2 intermetallic was used as a reinforcing agent to improve the mechanical properties of an aluminum matrix. Different amounts of A13Mg2 nanoparticles （ranging from 0wt% to 20wt%） were milled with aluminum powders in a planetary ball mill for 10 h. Consolidation was conducted by uniaxial pressing at 400β under a pressure of 600 MPa for 2 h. Microstructural characterization confirms the uniform distribution of A13Mg2 nanoparticles within the matrix. The effects of nano-sized A13Mg2 content on the wear and mechanical properties of the composites were also investigated. The results show that as the A13Mg2 content increases to higher levels, the hardness, compressive strength, and wear resistance of the nanocomposites increase significantly, whereas the relative density and ductility decrease. Scanning electron microscopy （SEM） analysis of worn surfaces reveals that a transition in wear mechanisms occurs from delamination to abrasive wear by the addition of A13Mg2 nanoparticles to the matrix.

关键词： nanocomposites intermetallics mechanical milling hot pressing wear compressive strength hardness

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Preparation and Characteristics of Poly(butylene adipate-coterephthalate)/Polylactide Blend Films via Synergistic Efficiency of Plasticization and Compatibilization

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Chinese Journal of Polymer Science 2019年第1期37卷 68-78页

作者： Worasak Phetwarotai Neeranuch Phusunti Duangdao Aht-Ong Department of materials Science and technology Faculty of Science Prince of Songkla University Bioplastic Research Unit Department of Materials Science and Technology Faculty of Science Prince of Songkla University Department of Chemistry Faculty of Science Prince of Songkla University Department of materials Science Faculty of Science Chulalongkorn University center of excellence on petrochemical and materials technology

Polylactide(PLA)films blended with poly(butylene adipate-co-terephthalate)(PBAT)were hot melted using a twin screw extruder with the addition of triethyl citrate(TEC)as a plasticizer and toluene diisocyanate(TDI)as a *** synergistic effects of the two additives on the mechanical,thermal,and morphological properties of the PLA/PBAT blend films were *** influence of TEC content on the plasticized PLA films and the effect of TDI’s presence on the PLA/PBAT blend films were also studied by comparing them with neat *** results showed a pronounced increase in elongation at break of the plasticized PLA films with increasing TEC levels,but a slight reduction in thermal ***,the addition of TEC and TDI to the blend system not only synergistically enhanced the tensile properties and tensile-impact strength of the PLA/PBAT blends,but also affected their crystallinity and cold crystallization rate,a result of the improvement of interfacial interaction between PLA and PBAT,including the enhancement of their chain *** synergy of the plasticization and compatibilization processes led to the improvement of tensile properties,tensile-impact strength,and compatibility of the blends,accelerating cold crystallization without affecting crystallization.

关键词： Polylactide Plasticization Compatibilization Blend Crystallization

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Synthesis and Properties of Hydroxytelechelic Polyisobutylenes by End Capping with tert-Butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane

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Chinese Journal of Polymer Science 2019年第9期37卷 936-942页

作者： Jing Li Kang-Da Wu Huang Shan Jing-Han Zhang Ming Zhao Guang-Bi Gong Wen-Li Guo Yi-Bo Wu College of materials Science & Engineering Beijing Institute of Petrochemical Technology Beijing 102617 China Lanzhou petrochemical Research center Petrochina Lanzhou 730060 China Beijing Key Laboratory of Specialty Elastomer Composite materials Beijing Institute of Petrochemical Technology Beijing 102617 China

The low-activity cationic monomer tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane was synthesized by Grignard reaction and hydroxyl-protection reaction. Living polyisobutylene chains were initially synthesized by controlled cationic polymerization and then capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane. The hydrolysis of these polyisobutylenes end capped with tert-butyl-dimethyl-(4-methyl-pent-4-enyloxy)-silane gave rise to hydroxytelechelic polyisobutylene. NMR analysis confirmed that the hydrolysis was complete. Results also showed that a low polymerization temperature favored the participation of tert-butyl-dimethyl-(4- methyl-pent-4?enyloxy)-silane in the end-capping reaction. Moreover, polyisobutylene-based polyurethane exhibited greater acid resistance than commercial polyurethane.

关键词： Carbocationic polymerization Polyisobutylene Hydrolysis Polyisobutylene-based polyurethane

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Investigation of adsorption/desorption performance by aminopropyltriethoxysilane grafted onto different mesoporous silica for post-combustion CO_(2) capture

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Clean Energy 2020年第2期4卷 120-131页

作者： Pailin Muchan Chintana Saiwan Manit Nithitanakul The Petroleum and petrochemical College Chulalongkorn UniversitySoi Chula 12Phyathai RoadPathumwanBangkok 10330Thailand center of excellence on petrochemical and materials technology Chulalongkorn UniversityBangkok 10330Thailand

Mesoporous silicas with hexagonal structure(MCM-41 and SBA-15)and cubical interconnected pore structure(KIT-6)were synthesized and modified with aminopropyltriethoxysilane(APTES)for using as adsorbents in carbon-dioxide(CO_(2))-adsorption *** CO_(2)-adsorption experiment was carried out at room temperature and atmospheric pressure using 15%CO_(2) with a flow rate of 20 mL/min and the desorption experiment was carried out at 100℃ under N_(2) balance with a flow rate of 20 mL/*** adsorption capacity and adsorption rate of all modified mesoporous silicas were enhanced due to the presence of primary amine in the structure,which was able to form a fast chemical reaction with CO_(2).All adsorbents showed good adsorption performance stability after using over five adsorption/desorption *** to the effect of the adsorbents’porous structure on the adsorption/desorption process,an adsorbent with sufficient pore-size diameter and pore volume together with interconnected pore,KIT-6,represents a promising adsorbent that gave the optimum adsorption/desorption performance among *** showed reasonable adsorption capacity with a high rate of *** addition,it could also be regenerated with 99.72% efficiency using 12.07 kJ/mmol CO_(2) of heat duty for regeneration.

关键词： CO_(2)adsorption mesoporous silica adsorption capacity adsorption rate heat duty for adsorbent regeneration

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Facile preparation of polybenzoxazine-based carbon microspheres with nitrogen functionalities:effects of mixed solvents on pore structure and supercapacitive performance

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 1072-1086页

作者： Uthen Thubsuang Suphawadee Chotirut Apisit Thongnok Archw Promraksa Mudtorlep Nisoa Nicharat Manmuanpom Sujitra Wongkasemjit Thanyalak Chaisuwan School of Engineering and technology Walailak UniversityNakhon Si Thammarat 80160Thailand School of Science Walailak UniversityNakhon Si TTiammarat 80160Thailand The Petroleum and petrochemical College Chulalongkom UniversityBangkok 10330Thailand center of excellence on petrochemical and materials technology Bangkok 10330Thailand

In this study,polybenzoxazine(PBZ)-based carbon microspheres were prepared via a facile method using a mixture of formaldehyde(F)and dimethylformamide(DMF)as the *** PBZ microspheres were successfully obtained at the F/DMF weight ratios of 0.4 and *** microspheres exhibited high nitrogen contents after *** microstructures of all the samples showed an amorphous phase and a partial graphitic *** porous carbon with the F/DMF ratio of 0.4 showed significantly higher specific capacitance(275.1 F·g^-1)than the reference carbon(198.9 F·g^-1)at 0.05 A-g This can be attributed to the synergistic electrical double-layer capacitor and pseudo-capacitor behaviors of the porous carbon with the F/DMF ratio of *** presence of nitrogen/oxygen functionalities induced pseudo-capacitance in the microspheres,and hence increased their total specific *** activation with CO2,the specific surface area of the carbon microspheres with the F/DMF ratio of 0.4 increased from 349 to 859 m^2•g^-1 and the specific capacitance increased to 424.7 F·g^-1 This value is approximately two times higher than that of the reference *** results indicated that the F/DMF ratio of 0.4 was suitable for preparing carbon microspheres with good supercapacitive *** nitrogen/oxygen functionalities and high specific surface area of the microspheres were responsible for their high capacitance.

关键词： PBZ carbon porous materials microsphere supercapacitor

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