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KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

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Journal of Energy Chemistry 2017年第1期26卷 56-62页

作者： ChaitraK Vinny r T Sivaraman P Narendra reddy Chunyan Hu Krishna Venkatesh Vivek C S nagaraju N Kathyayini N Department of Nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara DistrictBangalore Rural 562112 KarnatakaIndia Naval Materials research Laboratory DRDOAmbernathThane 421506India Department of Chemistry St.Joseph’s College P.G.Centre.46Langford RoadShanthinagarBangaloreKarnataka 560027India research resource Centre Visveswaraya Technological UniversityBelagaviIndia College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China National Engineering research Center for Dyeing and Finishing of Textiles Donghua UniversityShanghai 201620China

Here we demonstrate the fabrication, electrochemical performance and application of an asymmetric supercapacitor (AS) device constructed with ss-Ni(OH)(2)/MWCNTs as positive electrode and KOH activated honeycomb-like porous carbon (K-PC) derived from banana fibers as negative electrode. Initially, the electrochemical performance of hydrothermally synthesized ss-Ni(OH)(2)/MWCNTs nanocomposite and K-PC was studied in a three-electrode system using 1 M KOH. These materials exhibited a specific capacitance (Cs) of 1327 Fig and 324 F/g respectively at a scan rate of 10 mV/s. Further, the AS device i.e., ss-Ni(OH)(2)/MWCNTs// K-PC in 1 M KOH solution, demonstrated a Cs of 156 F/g at scan rate of 10 mV/s in a broad cell voltage of 0-2.2 V. The device demonstrated a good rate capability by maintaining a Cs of 59 F/g even at high current density (25 A/g). The device also offered high energy density of 63 Wh/kg with maximum power density of 5.2 kW/kg. The AS device exhibited excellent cycle life with 100% capacitance retention at 5000th cycle at a high current density of 25 A/g. Two AS devices connected in series were employed for powering a pair of LEDs of different colors and also a mini fan. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Asymmetric supercapacitor device Activated porous carbon High energy density Cyclability Power source

Highly flexible conductive fabrics with hierarchically nanostructured amorphous nickel tungsten tetraoxide for enhanced electrochemical energy storage

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Nano research 2015年第12期8卷 3749-3763页

作者： Goli nagaraju ramesh Kakarla Sung Min Cha Jae Su Yu Department of Electronics and radio Engineering Institute for Wearable Convergence Electronics Kyung Hee University 1 Seocheon-dong Giheung-gu Yongin-si Gyeonggi-do 446-701 Republic of Korea Department of Environmental Science and Engineering Kyung Hee University 1Seocheon-dong Giheung-gu Yongin-si Gyeonggido 446-701 Republic of Korea

Amorphous nickel tungsten tetraoxide （NiWO4） nanostructures （NSs） were successfully synthesized on a flexible conductive fabric （CF） using a facile one- step electrochemical deposition （ED） method. With an applied external cathodic voltage （-1.8 V for 15 min）, the amorphous NiWO4 NSs with burl-like morphologies adhered well on the seed-coated CF substrate. The burMike amorphous NiWO4 NSs on CF （NiWO4 NSs/CF） are employed as a flexible and binder-free electrode for pseudocapacitors, which exhibit remarkable electrochemical properties with high specific capacitance （1,190.2 F/g at 2 A/g）, excellent cyclic stability （92% at 10 A/g）, and good rate capability （765.7 F/g at 20 A/g） in 1 M KOH electrolyte solution. The superior electrochemical properties can be ascribed to the hierarchical structure and large specific surface area of the burl-like amorphous NiWO4 NSs/CF. This cost-effective facile method for the synthesis of metal tungsten tetraoxide nanomaterials on a flexible CF could be promising for advanced electronic and energy storage device applications.

关键词： amorphous NiWO4 nanostructures conductive fabrics electrochemical deposition electrochemical energystorage properties

Ionothermal Synthesis and Photoactivity of Ti_(17) and Ti_(19)-Oxo Clusters Functionalized by Sulfate and 1,10-Phenanthroline Ligands

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Chinese Journal of Chemistry 2023年第24期41卷 3605-3610页

作者： Kalpana Chintakrinda nagaraju Narayanam Guang-Hui Chen Jian Zhang Lei Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian35002 China University of Chinese Academy of Sciences Beijing100049 China

In this study,we successfully synthesized two titanium-oxo clusters,namely Ti_(19)(μ_(3)-O)_(19)(μ_(2)-O)_(10)(1,10-phn)_(2)(OiPr)_(18)](PTC-178)and(EMIm)_(3)[Ti_(17)(μ_(4)-O)_(4)(μ_(3)-O)_(16)(μ_(2)-O)_(4)(SO_(4))_(3)(μ_(2)-OiPr)_(4)(OiPr)_(13)](PTC-179).These clusters were synthesized using an ionothermal reaction and possess similar nuclearity(Ti19 ***17)***,we observed that these complexes exhibit varying activities for photocatalytic degradation of Methylene Blue(MB)dye and distinct photocurrent responses for photoelectrochemical studies due to their different surface-decorated *** study provides valuable insights into the design of Ti-oxo molecular clusters with similar nuclearity but different surface environments,allowing for the establishment of critical structure-property ***,our research contributes to the exploration of sustainable synthetic methods for high nuclearity TOCs using ionic liquids.

关键词： Ionic liquids Ti-Oxo Clusters(TOCs) Photocatalysis Synthesis design Cluster compounds

Ternary MOF‑Based redox Active Sites Enabled 3D‑on‑2D Nanoarchitectured Battery‑Type Electrodes for High‑Energy‑Density Supercapatteries

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Nano-Micro Letters 2021年第1期13卷 319-336页

作者： Goli nagaraju SChandra Sekhar Bhimanaboina ramulu SkKhaja Hussain DNarsimulu Jae Su Yu Institute for Wearable Convergence Electronics Department of Electronic EngineeringKyung Hee University1732 Deogyeong‑daeroGihung‑guYongin‑siGyeonggi‑do 17104Republic of Korea Department of Chemical Engineering College of EngineeringKyung Hee University1732 Deogyeong‑daeroGihung‑guYongin‑siGyeonggi‑do 17104Republic of Korea

Designing rationally combined metal-organic frameworks(MOFs)with multifunctional nanogeometries is of significant research interest to enable the electrochemical properties in advanced energy storage ***,we explored a new class of binderfree dual-layered Ni-Co-Mn-based MOFs(NCM-based MOFs)with three-dimensional(3D)-on-2D nanoarchitectures through a polarityinduced solution-phase method for high-performance *** hierarchical NCM-based MOFs having grown on nickel foam exhibit a battery-type charge storage mechanism with superior areal capacity(1311.4μAh cm^−2 at 5 mA cm^−2),good rate capability(61.8%;811.67μAh cm^−2 at 50 mA cm^−2),and an excellent cycling *** superior charge storage properties are ascribed to the synergistic features,higher accessible active sites of dual-layered nanogeometries,and exalted redox chemistry of multi metallic guest species,*** bilayered NCM-based MOFs are further employed as a battery-type electrode for the fabrication of supercapattery paradigm with biomass-derived nitrogen/oxygen doped porous carbon as a negative electrode,which demonstrates excellent capacity of 1.6 mAh cm^−2 along with high energy and power densities of 1.21 mWh cm^−2 and 32.49 mW cm^−2,***,the MOF-based supercapattery was further assembled with a renewable solar power harvester to use as a self-charging station for various portable electronic applications.

关键词： Metal-organic frameworks Dual layers redox chemistry Supercapattery renewable energy

A comparative pharmacological and phytochemical analysis of in vivo & in vitro propagated Crotalaria species

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Asian Pacific Journal of Tropical Medicine 2012年第1期5卷 37-41页

作者： Bellary nagaraju Devendra Nakka Srinivas Kusuma Sandeep Solmon Department of Biotechnology GITAM Institute of ScienceGITAM UniversityVisakhapatnam-530 045India Department of Bioinformatics GITAM Institute of ScienceGITAM UniversityVisakhapatnam- 530 045India

Objective:To compare the efficacy for *** and antioxidant activities of petroleum ether,chloroform,ethanol,and aqueous extracts of in vitro propagated plants and field grown plants of Crotalaria sps.,for against five human ***:The preliminary pbytochemistry,antimicrobial and antioxidant activities were evaluated using disc diffusion and DPPH radical scavenging ***:The ethanolic extract of in vitro raised Crotalaria retusa（***） was effective on tested microorganisms and optimal ZOI values of 38 mm was obtained against Pseudomonas aeruginosa（***）.The optimal concentration (IC50 required for 50%inhibition of the DPPH radical scavenging was 57.6μg/mL obtained for ethanolic extract of in vitro propagated *** in vitro propagated *** has significant pharmacological activities while the Crotalaria prostrate（***） and Crotalaria medicaginea（***） has low pharmacological *** was cleared that ethanolic extract of in vitro regenerated plants was most ***:These findings indicate compounds isolated from ethanolic extracts of Crotalaria sps..possesses pharmacological properties and potential to develop natural compounds based pharmaceutical *** IC50 values for ethanolic extracts of Crotalaria *** evaluated through the Linear regression analysis（r2≤1）.

关键词： Comparative studies Crotalaria species Pharmacological studies Phytochemistry Antioxidant activity

非晶态金属-磷酸铝催化正庚醛和苯甲醛羟醛缩合制茉莉醛(英文)

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催化学报 2015年第2期36卷 209-215页

作者： A. Hamza N. nagaraju Catalysis research Laboratory St. Joseph's College P.G. and Research Centre Bangalore 560027 India

Amorphous aluminophosphate(AlP) and metal-aluminophosphates(MAlPs, where M = 2.5 mol%Cu, Zn, Cr, Fe, Ce, or Zr) were prepared by coprecipitation method. Their surface properties and catalytic activity for the synthesis of jasminaldehyde through the aldol condensation of nheptanal and benzaldehyde were investigated. The nitrogen adsorption-desorption isotherms showed that the microporosity exhibited by the aluminophosphate was changed to a mesoporous and macroporous structure which depended on the metal incorporated, with a concomitant change in the surface area. Temperature-programmed desorption of NHand COrevealed that the materials possessed both acidic and basic sites. The acidic strength of the material was either increased or decreased depending on the nature of the metal. The basicity was increased compared to AlP. All the materials were X-ray amorphous and powder X-ray diffraction studies indicated the absence of metal oxide phases. The Fourier transform infrared analysis confirmed the presence of phosphate groups and also the absence of any M-O moieties in the materials. The selected organic reaction occurred only in the presence of the AlP and MAlPs. The selectivity for the jasminaldehyde product was up to 75% with a yield of 65%. The best conversion of nheptanal with a high selectivity to jasminaldehyde was obtained with FeAlP as the catalyst, and this material was characterized to have less weak acid sites and more basic sites.

关键词： Amorphous aluminophosphate Metal-aluminoposphate Surface property Acid-base bi-functional catalyst Aldol condensation Jasminaldehyde

Aggregation-induced emission luminogens for organic light-emitting diodes with a single-component emitting layer

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Aggregate 2023年第1期4卷 41-89页

作者： Jinhyo Hwang Peethani nagaraju Min Ju Cho Dong Hoon Choi Department of Chemistry Research Institute for Natural SciencesKorea UniversitySeongbuk-guSeoulRepublic of Korea

Organic light-emitting diodes(OLEDs)have garnered increasing attention as a promising candidate for application in next-generation displays and solid-state lighting *** doping technique commonly used to fabricate light-emitting layers(EMLs)of OLEDs disperses the emitting material in a host matrix to mitigate aggregation-induced quenching(ACQ).Alternatively,owing to their high efficiency and ease of manufacture,nondoped OLEDs have been developed as a substitute for doped *** fabricating nondoped OLEDs,it is essential to suppress the ACQ effect in the EML and efficiently utilize the generated excitons for radiative *** the discovery of aggregation-induced emission(AIE)by Tang et al.,significant work has been done to improve the stability and efficiency of nondoped OLEDs based on fluorescent AIE luminogens(AIEgens).Fluorescent AIEgens,synthesized using various molecular frameworks,such as silole,tetra/triphenylethylene,tetraphenylpyrazine,and tetraphenylbenzene,exhibit high photoluminescence quantum yields in the solid ***,many studies have reported that fluorescent AIEgen-based OLEDs have excellent external quantum efficiency and exhibit emission at various wavelengths,including deep-blue/blue/green *** the development of fluorescent AIEgens,delayed fluorescent AIEgens with efficient triplet utilization through reverse intersystem crossing and AIE properties have been adopted as ideal emitters and used in nondoped *** review systematically discusses and summarizes recent reports on the development of AIEgens for nondoped OLEDs by grouping them into fluorescent and delayed fluorescent *** purpose of this review is to provide deep insights into the design of novel AIEgens for high-performance nondoped OLEDs.

关键词： aggregation-induced emission nondoped emitting layer organic light-emitting diode

In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

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Journal of Magnesium and Alloys 2022年第12期10卷 3565-3575页

作者： Manchi nagaraju S.Chandra Sekhar Bhimanaboina ramulu Shaik Junied Arbaz Jae Su Yu Department of Electronics and Information Convergence Engineering Kyung Hee University1732 Deogyeong-aeroGihung-guYongin-siGyeonggi-do 17104Republic of Korea

Currently,bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical ***,we synthesized cobalt-magnesium selenates (CoSeO3-Mg Se O4,CMS) via a facile hydrothermal process,followed by *** first,cobalt-magnesium oxide (Co2.32Mg0.68O4,CMO) was in situ prepared by a one-pot hydrothermal *** investigation on the morphological change was performed by synthesizing the same CMO samples at different growth times by keeping the temperature *** CMO electrode designed for 8 h of growth time (CMO-8 h)with an attractive morphology showed a higher areal capacity of 101.7μAh cm-2(at 3 m A cm-2) than the other CMO electrodes prepared for 6 and 10 *** exalted performance was achieved by the selenization of the CMO-8 h sample to form the CMS *** 3 m A cm-2,the resulted CMS exhibited nearly three times higher capacity,i.e.,385.4μAh cm-2,than the CMO-8 h ***,an asymmetric cell fabricated with CMS as a positive electrode also revealed good energy storage *** the applied voltage between 0 and 1.5 V,the asymmetric cell demonstrated maximum energy density of 0.159 m Wh cm-2(18.6 Wh kg-1) and maximum power density of 18.47 m W cm-2(1938 W kg-1),***,novel magnesium-based metal selenates can act as an efficient electrode for energy storage.

关键词： Co2.32Mg0.68O4 CoSeO3–MgSeO4 In situ formation Energy storage Asymmetric cell

Ionic liquid-assisted hydrothermal synthesis of SnS nanoparticles:Electrode materials for lithium batteries,photoluminescence and photocatalytic activities

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Journal of Energy Chemistry 2018年第3期27卷 806-812页

作者： K.N.Manukumar G.nagaraju Brij Kishore C.Madhu N.Munichandraiah Department of Chemistry Siddaganga Institute of TechnologyTumkurKarnatakaIndia Department of Inorganic and Physical Chemistry Indian Institute of ScienceBangaloreKarnatakaIndiac Department of Physics.Siddaganga Institute of Technology.Tumkur KarnatakaIndia

Tin mono-sulphide（Sn S） nanoparticles（Nps） have been successfully synthesised through ionic liquid assisted hydrothermal method using hydrated tin（II） chloride as a precursor, thiourea as sulphur source precursors using 2-Methoxy ethyl methyl imidazolium methane sulfonate ionic liquid as co-solvent. The reitveld refinement on powder X-ray diffraction（PXrD） confirmed the presence of orthorhombic Sn S structure as major phase along with traces amount of Sn S2 and Sn2 S3. Diffuse reflectance spectrum studies revealed the energy band gap around 1.38 e V. TEM images confirmed the Sn S Nps with average particle size of 40 nm and HrTEM suggest good crystallinity. The electrochemical property for lithium storage behaviour shows an initial discharge capacity of 658 m Ah/g and it retains discharge capacity of 426 m Ah/g for 16 cycles, at current density 100 m A/g. The obtained results indicate that Sn S Nps to be one of the possible promising anode materials for next generation Lithium batteries. Photoluminescence study of Sn S Nps shows a strong green emission at 530 nm. Sn S Nps were also tested for the photocatalytic adsorption of methylene blue and rhodamine B.

关键词： Nanoparticles Lithium-ion batteries Ionic liquids Ionothermal