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Cotton pads-derived carbon materials/reduced graphene oxide modified with polypyrrole for electrode of supercapacitors

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Journal of Energy Chemistry 2024年第7期94卷 41-53页

作者： Ofelia marias-Pinedo Elvis OLopez Ivonne EMonje RSoria-Martinez Antony Bazan-Aguilar Clemente Alfredo Luyo Caycho Gabriel Angel Planes Angelica Maria Baena-Moncada Laboratorio de Investigacion de Electroquimica Aplicada Facultad de Ciencias de la Universidad Nacional de IngenieriaAv.Tupac Amaru 210RimacLimaPeru Department of Experimental Low Energy Physics Brazilian Center for Research in Physics(CBPF)Rio de Janeiro22290-180Brazi Universidad Tecnologica del Peri Av.Arequipa 26515046 LimaPeru Centeror theevelopmentof Adanced Materials and Nanotechlogy Universidad NacionaldeIngeneria33LimaP Departamento de Quimica Universidad Nacional de Rio CuartoInstituto de Investigaciones en Tecnologias Energeticas y Materiales Avanzados(IITEMA)Ruta Nac.36Km 601(X5804BYA)RioCuartoCordobaArgentina

This study investigates the influence of electropolymerization conditions on the deposition of polypyrrole(PPy)onto cotton-derived carbon fiber(Cf)modified with reduced graphene oxide(rGO)for supercapacitors applications using an experimental/theorical *** surface modification of Cf by rGO and/or by PPy electrodeposited at 10,25 and 50 mV s^(-1) was thoroughly examined physicochemical and *** electrodes comprising Cf-rGo-PPy,synthesized via electropolymerization at 25 mV s^(-1),demonstrated a remarkable increase in capacitance,showcasing~742 f g^(-1) compared to 153 f g^(-1) for ***,N_(2)-surface area,XPS,and TD-DfT approach revealed that the higher capacitance observed in Cf-rGo-PPy electrodes underscores the influence of morphology and charged nitrogen species on the electrochemical performance of these modified ***,this electrode material achieves a specific capacitance retention of~96%of their initial capacitance after 10000 cycles at 0.5 A g^(-1) measured in a two-electrodes cell *** work also discusses the influence of the scan rate used for pyrrole electropolymerization on the pseudocapacitance contribution of PPy and its possible effect on the porosity of the *** results highlight the importance of appropriate electropolymerization conditions that allow obtaining the synergistic effect between Cf,rGO and PPy.

关键词： Supercapacitors Cotton pads-derived carbon fibers rGO PPy TD-DfT

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Energetic Analysis of Gasification of Aqueous Biomass in Supercritical Water

Energetic Analysis of Gasification of Aqueous Biomass in Sup...

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The 18th European Biomass Conference and Exhibition

作者： marias.f. Letellier S. Cezac P. Serin J.P. Demarthon R.

The aim of this work is to investigate the field of gasification of aqueous biomass in supercritical water. In order to achieve this analysis, a mathematical model（based on thermodynamical equilibrium assumption） is built. This model allows not only for the computation of the solid, liquid and gas phases produced in a process composed of a gasification reactor and a separator unit, but also, for the computation of the energy requirements or yield in these specific units. The composition of these three phases is computed in terms of fractions of CH4, H2, H2 O, CO, CO2, H2 S, NH3, C6H5 OH, CH3 COOH, CH3 CHO, C（s） and minerals. The model also predicts the lower heating value of the gas leaving the process. The main problem that is encountered in the derivation of this mathematical model is the estimation of the activities of the chemical species present in the mixture as well as the enthalpy of this mixture. In this work, these evaluations are performed using Peng-Robinson equation of state. Results of the model are presented in the frame of gasification of vinasse which is an aqueous residue from the alcohol production industry. It is shown that some specific conditions exist where it is not necessary to yield energy to the reactor to convert the incoming biomass into a gas for which the lower heating value can reach 5MJ/kg with a gasification efficiency of 85%.

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Spawning induction and fecundity of commercial native fish species from the São francisco River basin,Brazil,under hatchery conditions

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Agricultural Sciences 2013年第8期4卷 382-388页

作者： fábio Pereira Arantes Yoshimi Sato Edson Vieira Sampaio Elizete Rizzo Nilo Bazzoli Laboratório de Ictiohistologia Departamento de MorfologiaUniversidade Federal de Minas Gerais(UFMG)Belo HorizonteBrasil Estacao de Hidrobiologia e Piscicultura de Três marias Companhia de Desenvolvimento dos Vales do Sao Francisco e Parnaíba(CODEVASF)Três MariasBrasil Programa de Pós-Graduacao em Zoologia de Vertebrados Pontifícia Universidade Católicade Minas GeraisPUC MinasBelo HorizonteBrasil

In order to exploit native fish species for aquaculture, basic parameters of artificial reproducetion and estimates of reproductive potential for this fish must be determined to improve hatchery success. We analyze seven Brazilian commercial fish. Spawning was induced using the hypophysation method, with injection of crude carp pituitary extract (CCPE). Characiformes species signaled the spawning time with behavioral alterations (usually circular movements). The time of oocyte extrusion varied from 5.3 ± 0.3 h in Salminus franciscanus to 8.6 ± 0.1 h in Prochilodus argenteus after the second CCPE injection. The greatest diameter of a vitellogenic oocyte was registered for P. argenteus (873.9 ± 122.2 μm) and the smallest was for Pimelodus maculates (465.4 ± 36.3 μm). The diameter of vitellogenic oocytes was very similar among species belonging to the same family. The highest ROI values were registered for Prochilodus costatus(27.0 ± 3.5 μm) and P. argenteus (23.4 ± 3.7 μm), while the lowest values were found in Pseudoplatystoma corruscans (4.6 ± 0.9 μm) and P. maculatus (6.0 ± 1.3 μm). Absolute fecundity (number of oocytes released at spawning) was lowest in P. maculatus and highest in P. corruscans. Relative fecundity (Rf) presented a high correlation (r = 0.98 to 0.99) with gonad weight, indicating high efficiency of spawning. The Rf also presented a high correlation with body weight (r = 0.88 to 0.97) and total length (r = 0.86 to 0.92). The highest Rf was registered for Leporinus obtusidens, and the lowest was for P. corruscans. Released fecundity had a negative correlation with the diameter of vitellogenic oocytes and with the height of the follicular cells, and a positive correlation with the thickness of the zona pelucida. These results indicate that the species studied herein are suitable candidates for aquaculture due to their reproductive and zootechnical characteristics.

关键词： Spawning Induction fecundity Oocyte Neotropical fish Sao francisco River

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