15 research outputs found
Smartphone-integrated electrochemical (bio) sensors as smart and reliable analytical tools
No full textProof of concept of flexible supercapacitors fabricated with carbon gels and MnO2 printed on carbon cloth
No full textUp to now, the scientific community has achieved a significant progress in designing innovative, flexible and conductive materials, paving the way for the advancement of cutting-edge electronic devices dedicated for smart wearable applications. Herein, the introduction of carbon cloth (CC)-based platform for energy storage devices was adopted for nanomaterial coating and improved multilayer adhesion. Using carbon xerogel (CX) and manganese dioxide (MnO2) printed on CC, an asymmetric supercapacitor was developed, achieving a high specific capacitance of 213 F g−1, energy density of 24 Wh·kg−1, at a power density of 180 W kg−1, and low self-discharge rate with a voltage retention of 72 % after 22 h. This work paves the way for the adoption of carbon cloth thanks to its outstanding features as a promising and flexible platform to drive the development of next-generation smart and wearable electronic devices dedicated for healthcare and environmental monitoring applications.This research was funded by ERA.NET Network (www.m-era.net/) through INNENERMAT project, and from grants PID2020-113001RB-I00 and PCI2020-112039 funded by MCIN/AEI/10.13039/501100011033. The author Achref Chebil thanks the European Union – Next Generation EU from the Italian Ministry of Environment and Energy Security POR H2 AdP MMES/ENEA with involvement of CNR and RSE, PNRR - Mission 2, Component 2, Investment 3.5 "Ricerca e sviluppo sull'idrogeno", CUP: B93C22000630006.Peer reviewe
High power density supercapacitor devices based on nickel foam-coated rGO/MnCo2O4 nanocomposites
No full textNew nanocomposite electrode material of rGO/MnCo2O4 was freely loaded on flexible substrate on nickel foam and prepared by a simple, cost-effective, and eco-friendly pathway. The results show that the spinel manganese cobaltite (MnCo2O4) with reduced graphene oxide (rGO) nanocomposite forms a uniform deposit and densely covers on the nickel foam (NF). The electrochemical measurements were investigated in three methods, such as cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The synergistic effects from rGO and MnCo2O4 deliver outstanding an excellent electrochemical performance that was not realized by any of these components alone. The electroactive material exhibits a high specific capacitance of Csp = 808 F/g at 2 mV/s in 1 M KOH solution. Furthermore, this device delivers an excellent power density of P = 7658 W/kg and a high energy density of E = 15.2 Wh/kg. More importantly, cycling retention is 135% after 1000 charge/discharge cycles. This study proposes that the as-prepared (rGO/MnCo2O4)/nickel foam has a potential application and a promising candidate for energy storage devices. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.Ministère de l’Enseignement Supérieur et de la Recherche Scientifique, MESRSThe authors received financial support from the Ministry of Higher Education and Scientific Research of Tunisia. Achref Chebil has studied in Ates polymer research group between 23 May 2019 and 7 August 2019 in Tekirdag Namik Kemal University, Turkey
Supercapacitor and battery performances of multi-component nanocomposites: Real circuit and equivalent circuit model analysis
No full textThis work presents a state of the art review of energy storage systems and its applications integrating an alternative technology for the electrical energy generation known as supercapacitors and batteries. Indeed, this review focuses on supercapacitors and batteries as energy storage systems. The state of the art review contains an analysis of the evolution of electroactive materials and a classical modeling based on electric equivalent circuits. The synthesis of electrical circuits from physics-based batteries and supercapacitor models that represent con-servation and diffusion interactions is the subject of this research. To create the circuits, the suggested synthesis technique employs model discretization, linearization, balanced model order reduction, and passive network synthesis. Physical models are used to create circuits with various topologies. There is no such complex inves-tigation to the best of our knowledge, has not been reported and is expected to lead to breakthrough de-velopments to obtain nanocomposites
Reliability of electrode materials for supercapacitors and batteries in energy storage applications: a review
No full textSupercapacitors and batteries are among the most promising electrochemical energy storage technologies available today. Indeed, high demands in energy storage devices require cost-effective fabrication and robust electroactive materials. In this review, we summarized recent progress and challenges made in the development of mostly nanostructured materials as well as fabrication routes for energy storage devices. Indeed, we systematically sorted out the design principles of electrode materials such as lithium-ion, lead-acid, lithium-sulfur, nickel-cadmium, nickel-metal hydride, and sodium-ion for rechargeable batteries electrode and supercapacitors (SCs) electrode materials following by systematic discussions on electric double-layer capacitors, pseudocapacitors, and hybrid SCs behavior
Design, development and optimization of highly reliable 2 V solid-state supercapacitor device based on graphene-doped carbon gel and MnO2 electrodes
No full textSupercapacitors are revolutionising smart electronics devices by offering an excellent lifetime, outstanding energy and high power densities. In this context, we report on the synthesis of manganese dioxide using a convenient co-precipitation method, exploring its application as a positive pseudocapacitive electrode material, as well as the synthesis of carbon xerogel for use as a negative electrode, alongside the use of a solid-state electrolyte based on Na+-form Aquivion membrane. When the device is merged in an asymmetric external configuration, the resulting solid-state supercapacitor exhibits good electrochemical performance, as demonstrated by: i) a high specific capacitance of 110 F·g−1, ii) a high energy density of 16.7 Wh·kg−1 at a power density of 207 W·kg−1; and iii) an outstanding capacitance retention of 78 % after 50,000 cycles with an expanded voltage window of 2 V. To demonstrate their practical applicability, the developed devices were connected in series to power a fan and red LEDs with an external and internal configurations (up to 4 V), successfully powering them for several minutes. The proposed fabrication approach is simple to scale up and provides a sustainable, cost-effective manufacturing process for freestanding electrodes based on carbon xerogel/MnO2 nanocomposites towards next generation smart electronic devices.This research is funded by M-ERA.NET Network through INNENERMAT project, and from grants PID2020-113001RB-I00 and PCI2020-112039 funded by MCIN/AEI/10.13039/501100011033. The author A.C. thanks the European Union – Next Generation EU from the Italian Ministry of Environment and Energy Security POR H2AdP MMES/ENEA with involvement of CNR and RSE, PNRR - Mission 2, Component 2, Investmento 3.5, CUP B93C22000630006 “Ricerca e sviluppo sull' idrogeno”, for his postdoc position.Peer reviewe
Insight into iodine-doped carbon xerogel electrodes on the capacitance and long-term stability of quasi-solid-state supercapacitors
No full textCurrent efforts to enhance the electrochemical performance of supercapacitors are primarily driven by advancements in nanostructured electrode materials, particularly through the optimization of electrical double-layer capacitance and pseudo-capacitance mechanisms. In this context, we demonstrate the feasibility of developing a supercapacitor employing carbon xerogel (CX)-based electrodes, a sulfonated poly(ether-ether-ketone) (SPEEK) membrane, and a potassium iodide (KI) redox additive in a sodium sulfate (Na2SO4) electrolyte. The Na+-form SPEEK membrane acting as an ion conductor and electronic insulator, while the incorporation of potassium iodide (KI) at positive electrode significantly enhances the device's electrochemical metrics, achieving a high specific capacitance of 200 F·g−1, an energy density of 18.5 Wh·kg−1 and low self-discharge rates. Electrochemical impedance spectroscopy further revealed outstanding stability, low resistance, and high capacitance retention over 20,000 charge–discharge cycles and additional 300 h of voltage-hold (floating) within a wide voltage window from 0 to 1.6 V. These findings highlight the strong potential of the developed quasi-solid-state supercapacitors as promising candidates for next-generation energy storage devices.The authors would like to acknowledge Dr. Pietro Staiti for conceiving the initial ideas, designing and implementing the carbon–iodine structure, and conducting the first set of experiments on this system.
The author A.C. thanks the European Union – Next Generation EU from the Italian Ministry of Environment and Energy Security POR H2 AdP MMES/ENEA with involvement of CNR and RSE, PNRR - Mission 2, Component 2, Investment 3.5 “Ricerca e sviluppo sull’idrogeno”, CUP: B93C22000630006 for his postdoc position.Peer reviewe
Att skapa trygga och tillgängliga boendemiljöer : Hur man med relativt små medel och insatser kan förbättra tillgängligheten i befintliga fastigheter
No full textDet befintliga bostadsbeståndet i Sverige står inför stora utmaningar och restaurering är ett faktum då vi inte bygger bostäder i samma takt som vår befolkning ökar. Rapporten syftar till att möjliggöra för äldre och funktionshindrade att bo kvar längre i sina hem men även underlätta och förebygga för personer som idag inte har några rörelsehinder att enkelt förflytta sig i och kring den egna bostaden. Rapporten påvisar vilken förbättringspotential ur ett tillgänglighetsperspektiv som finns för en flerfamiljsfastighet från 1987 som ägs och förvaltas av HSB hyresfastigheter samt hur de skall arbeta för att skapa trygga och tillgängliga boendemiljöer i sitt bostadsbestånd så att de uppfyller kraven för högsta nivå i inventeringsverktyget TIBB. Arbetet är avgränsat till att utreda förbättringspotential och komma med konkreta åtgärdsförslag för en fastighet Mimer 10, Hörnellgatan 18 som HSB i Skellefteå äger, och undersöka entréer, gemensamhetsutrymmen och lägenheternas planlösningar. Rapporten baseras på en mix av kvalitativa och kvantitativa undersökningsmetoder vilka kompletterar varandra väl för aktuell studie. Två stycken fallstudier har utförts varav en replikation och diskussioner med sakkunnig har förekommit vid framtagande av åtgärdsförslag för att säkerställa validiteten. Författaren kom fram till en rad förbättringsåtgärder som kan implementeras i fastigheten vilket resulterade i en åtgärd- och prioriteringslista. Framför allt så handlade det om nivåutjämnande åtgärder samt att införa dörrautomatik till gemensamma utrymmen. I samråd med uppdragsgivaren HSB så framtogs ett förslag på att omvandla befintligt cykelförråd till ett permobil-, rullstol- och rollatorförråd och illustrationer för detta har upprättats i arkitektprogrammet ArchiCAD. I den undersökta fastigheten så är medelåldern för de boende hög och många skulle gynnas av en mer tillgänglig boendemiljö. För att vara en attraktiv hyresvärd så gäller det att lyssna på hyresgästernas behov och att ständigt sträva efter att höja kvalitén på fastigheterna. Utförs åtgärderna enligt framtagna förslag så kommer fastigheten Mimer 10 att uppfylla högsta tillgänglighetsnivå enligt inventeringsverktyget TIBB. The existing housing stock in Sweden is standing in front of a big challenge and restoration is a must when we are not building in the same rate that our population increases. This report is aiming to enable older people and those with disability to live longer in their homes and also to facilitate those that do not have a disability to easier move in and about their own homes. This report highlights improvements from an availability perspective for a multi-family property from 1987 that is owned and administrated by HSB rental property and shows how they shall work to make a safe and available housing environment in their housing stock, so that they can fulfill the claims of highest rank in the inventory tool TIBB. The report is defined to investigate potential improvement and propose measures for a building Mimer 10, Hörnellgatan 18 that is owned by HSB in Skellefteå and also to investigate entry’s, common areas and the apartments floorplan. The report is based on a mix of qualitative and quantitative methods which complements each other well for this study. Two case studies have been implemented and discussion with expert in availability have occurred to establishment a proposal to ensure the validity. The author concluded a line of improvements that can be implemented in the property which resulted in a measure- and priority list. Above all it was about level balancing measures and to introduce automatic doors to common areas. In consolation with the employer HSB there was a proposal develop to convert the existing bicycles storehouse to an electric wheelchair and walker storehouse, illustrations for this have been created in the architect program ArchiCAD. In the investigated property the average age for the tenants is high and many would benefit from a more accessible living environment. To be an attractive landlord it is important to listen to the tenants´ needs and continually strive to raise the quality of the property. If the arrangements are carried out and developed like the proposal suggests, the property Mimer 10 will fulfil the highest level of availability according to the inventory tool TIBB.
Towards a sustainable future: Advances and roadmap of activated carbon as a cost-effective bio-nanomaterial for electrochemical devices
No full textInternational audienc
Cyclooxygenase-2 Expression in Bladder Cancer and Patient Prognosis: Results from a Large Clinical Cohort and Meta-Analysis
No full text27/02/14 meb. Open access paper, OK to pu
