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Boosting the catalytic activity toward oxygen reduction via a heterostructure of porous iron oxide-decorated 2D NiO/NG nanosheets

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Journal of Energy Chemistry 2024年第6期93卷 669-681,I0016页

作者： kakali maiti Matthew T.Curnan Hyung Jun Kim Kyeounghak Kim Jeong Woo Han Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbuk 37673Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Department of Chemical Engineering Clean-Energy Research InstituteHanyang UniversitySeoul 04763Republic of Korea CSIR-Institute of Minerals and Materials Technology RRL CampusAcharya ViharBhubaneswarOdisha 751013India

As a noble metal substitute,two-dimensional(2D)hierarchical nano-frame structures have attracted great interest as candidate catalysts due to their remarkable advantages-high intrinsic activity,high electron mobility,and straightforward surface ***,they may replace Pt-based catalysts in oxygen reduction reaction(ORR)***,a simple method is developed to design hierarchical nano-frame structures assembled via 2D NiO and N-doped graphene(NG)*** procedure can yield nanostructures that satisfy the criteria correlated with improved electrocatalytic performance,such as large surface area,numerous undercoordinated atoms,and high defect ***,porous NG nanosheet architectures,featuring NiO nanosheets densely coordinated with accessible holey Fe_(2)O_(3) moieties,can enhance mesoporosity and balance *** improvements can facilitate charge transport and expose formerly inaccessible reaction sites,maximizing active site density *** functional theory(DFT)calculations reveal favored O_(2) adsorption and dissociation on Fe_(2)O_(3) hybrid structures when supported by 2D NiO and NG nanomaterials,given 2D materials donated charge to Fe_(2)O_(3) active *** systematic studies reveal that synergistic contributions are responsible for enriching the catalytic activity of Fe_(2)O_(3)@NiO/NG in alkaline media-encompassing internal voids and pores,unique hierarchical support structures,and concentrated N-dopant and bimetallic atomic ***,this work expands the toolbox for designing and synthesizing highly efficient 2D/2D shelled functional nanomaterials with transition metals,endeavoring to benefit energy conversion and related ORR applications.

关键词： N-doped graphene Holey Fe_(2)O_(3)nanocrystals NiO nanosheets High catalytic performance ORR

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Wet chemical synthesis of La_(9.83–x)Sr_xSi_6O_(26+δ)(0≤x≤0.50) powders, characterization of intermediate and final products

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Journal of Rare Earths 2015年第3期33卷 320-326页

作者： Kioupis D. Argyridou M. Gaki A. kakali G. National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. Athens 15773 Greece

In this paper we reported the preparation and extensive characterization of La9.83–x Sr x Si6O26＋δ（0≤x≤0.50） precursors, intermediate and final products. The sintering reactions, the phase formation, the structure as well as the powders＇ morphology were studied by means of thermogravimetric analysis, X-ray diffraction（XRD）, Fourier-transform infrared spectroscopy（FTIR） and scanning electron microscopy（SEM）. Moreover, the effect of stoichiometry on precursor＇s structure and morphology as well as on intermediate and final products was reported. As was concluded pure La9.83Si6O26＋δ, La9.38Sr0.45Si6O26＋δ and La9.33Sr0.50Si6O26＋δ could be prepared after sintering at 1400 °C for 20 h while La9.68Sr0.15Si6O26＋δ and La9.53Sr0.30Si6O26＋δ compounds contained minor traces（〈3.5%） of La2Si2O7 secondary phase. Concerning the synthesis, there have been no previous reports on the preparation of pure La9.83Si6O26＋δ, La9.38Sr0.45Si6O26＋δ and La9.33Sr0.50Si6O26＋δ compounds. The final powders consisted of spherical particles and an increase of Sr content seemed to inhibit sintering phenomena. The existence of interstitial oxygen at intermediate crystallographic positions of apatite structure had great effect on Si O4 sub-structure distortion. The increase of Sr content led to a major reduction of interstitial oxygen quantity and the refutation of silicon tetrahedron distortion.

关键词： lanthanum silicates synthesis modified Pechini method characterization rare earths

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Conductivity and electric properties of La_(1-x)Sr_xMnO_(3-δ)nanopowders

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Journal of Rare Earths 2009年第4期27卷 651-654页

作者： R.J.Wiglusz A.Gaki G.kakali A.Chuchmaa W.Strek Institute for Low Temperature and Structure Research Polish Academy of Sciences P.O.Box 937 50-442 Wroctaw Poland Chemical Engineering Department National Technical University Athens 9 Heroon Polytechniou Str. 15773 Athens Greece Electrotechnical Institute Division Electrotechnology and Materials Wroctaw Poland

La1-xSrxMnO3-δ was synthesized by the Pechini＇s method. The XRD pattern and TEM indicate the formation of the perovskite without the presence of secondary phases. It was found that La0.8Sr0.2MnO3-δsample prepared at 1000℃ in air atmospheres, contains about 13.11% of the manganese as Mn4＋ and 86.89% of the manganese as Mn3＋. The electric measurements were carded out for La0.8Sr0.2MnO3-δ nanoceramics by using impedance spectroscopy methods and found to be 0.1 S/cm at 250 ℃ similar to the typical value of La0.8Sr0.2MnO3-δ materials. Its dependence on reciprocal temperature shows quite complicated mechanism of conduction.

关键词： LSMO Pechini's method perovskite impedance spectroscopy rare earths

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Studies on RTD of Metalloids in the Blast Furnace

Studies on RTD of Metalloids in the Blast Furnace

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第五届国际炼铁科技大会

作者： Mukherjee kakali Prakash Swatantra National Metallurgical Laboratory

The paper presents a mathematical model to simulate residence time distribution （RTD） of metalloids in the lower region of blast furnace. It involves hybridization of models of slag rheology, momentum transfer phenomena of metal droplet descent through slag systems and metalloids transfer models for both dropping and hearth zone. The RTD simulation model offers a sober analysis of the blast furnace process variables and operational constraints to improve both its hot metal quality and productivity.

关键词： residence time distribution (RTD) metalloids lower region of blast furnace transport phenomena

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The Effect of Elevated Temperatures on the Composition and Structure of Blended Cement Pastes and Mortars

The Effect of Elevated Temperatures on the Composition and S...

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the 6th International Symposium on Cement & Concrete and Canmet/Aci International Symposium on Concrete Technology for Sustainable Development

作者： G.kakali R.Leventi V.Benekis S.Tsivilis National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. 15773 Athens Greece National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. 15773 Athens Greece National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. 15773 Athens Greece National Technical University of Athens School of Chemical Engineering 9 Heroon Polytechniou St. 15773 Athens Greece

In the present paper, the cohesion of blended cement pastes and mortars upon heating, is studied. Natural pozzolana, fly ash, ground granulated blastfurnace slag, metakaolin and limestone were used as

关键词： Blended cement, pastes, mortars, high temperature.

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硅中磷扩散的工艺模拟试验——一种新的模型

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微电子学 1985年第1期 46-49页

作者： G.Eranna D.kakali 肖辉扬

本文提出一种在硅内进行磷扩散的新工艺模型。该模型是基于对两个扩散系数采用两个独立的高斯分布得到的磷分布曲线是吻合的这一概念以及该分布曲线的弯曲和尾状结构这一结果之上的。

关键词：分布曲线扩散系数

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Adiponectin: Probe of the molecular paradigm associating diabetes and obesity

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World Journal of Diabetes 2015年第1期6卷 151-166页

作者： kakali Ghoshal Maitree Bhattacharyya Department of Biochemistry University of Calcutta

Type 2 diabetes is an emerging health challenge all over the world as a result of urbanization, high prevalence of obesity, sedentary lifestyle and other stress related factors compounded with the genetic prevalence. The health consequences and economic burden of the obesity and related diabetes mellitus epidemic are enormous. Different signaling molecules secreted by adipocytes have been implicated in the development of obesity and associated insulin resistance in type 2 diabetes. Human adiponectin, a 244-amino acid collagen-like protein is solely secreted by adipocytes andacts as a hormone with anti-inflammatory and insulinsensitizing properties. Adiponectin secretion, in contrast to secretion of other adipokines, is paradoxically decreased in obesity which may be attributable to inhibition of adiponectin gene transcription. There are several mechanisms through which adiponectin may decrease the risk of type 2 diabetes, including suppression of hepatic gluconeogenesis, stimulation of fatty acid oxidation in the liver, stimulation of fatty acid oxidation and glucose uptake in skeletal muscle, and stimulation of insulin secretion. To date, no systematic review has been conducted that evaluate the potential importance of adiponectin metabolism in insulin resistance. In this review attempt has been made to explore the relevance of adiponectin metabolism for the development of diabetes mellitus. This article also identifies this novel target for prospective therapeutic research aiming successful management of diabetes mellitus.

关键词： Adiponectin Obesity Dyslipidemia Type 2diabetes mellitus Insulin resistance

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变黑白头翁提取物降低亚砷酸盐对小鼠精细胞的毒性(英文)

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中西医结合学报 2012年第12期10卷 1433-1442页

作者： Asmita Samadder Jayeeta Das Sreemanti Das Durba Das Arnab De kakali Bhadra Anisur Rahman Khuda-Bukhsh Cytogenetics and Molecular Biology Laboratory Department of Zoology University of Kalyani Entomology Laboratory Department of Zoology University of Kalyani

目的:研究变黑白头翁提取物降低亚砷酸盐对小鼠精细胞毒性的作用。方法:给予实验小鼠亚砷酸钠(20mg/kg每日),并分别在第30、60、90天对小鼠进行检测。亚砷酸盐中毒小鼠被分为2组,其中一组给予变黑白头翁提取物(35mg/kg),另一组给予85%... 详细信息

目的:研究变黑白头翁提取物降低亚砷酸盐对小鼠精细胞毒性的作用。方法:给予实验小鼠亚砷酸钠(20mg/kg每日),并分别在第30、60、90天对小鼠进行检测。亚砷酸盐中毒小鼠被分为2组,其中一组给予变黑白头翁提取物(35mg/kg),另一组给予85%乙醇。通过检测小鼠精细胞凋亡标志蛋白CYP1A1、p53及caspase3的活性,确定细胞及DNA的损伤情况,并测定睾丸毒性标志物的水平。通过圆二色光谱仪及熔化温度数据检测变黑白头翁提取物与DNA的相互作用情况。结果:亚砷酸盐中毒小鼠的所有细胞凋亡标志蛋白及睾丸毒性标志物的水平均有所上升,而经变黑白头翁提取物治疗的小鼠上述各项指标均降低或恢复至正常水平。变黑白头翁提取物与DNA相互作用,引起了DNA结构和构象的变化。结论:变黑白头翁提取物可作为砷中毒引起的生殖功能损害的治疗药物给予研究和开发。

关键词：白头翁属植物提取物亚砷酸盐类细胞凋亡精细胞小鼠

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