A5014545593- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Conducting polymers and applications
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Ionic liquids properties and applications
- Electrocatalysts for Energy Conversion
- Electric and Hybrid Vehicle Technologies
- Fuel Cells and Related Materials
- Electrochemical sensors and biosensors
- Graphene research and applications
- Advanced Sensor and Energy Harvesting Materials
- Nanomaterials for catalytic reactions
Poznań University of Technology
2016-2024
École Polytechnique Fédérale de Lausanne
2023
Highly tunable properties of materials used for the construction electrochemical capacitors make them a perfect choice broad scope applications with high power demand. The ability to design system according expected power/energy profile allows being considered as powerful alternatives conventional and batteries. Carbon developed specific surface area are most common electrode components because their cost, versatile form, availability, easiness processing, eco-friendly character. Biomass is...
This paper reports on the performance of supercapacitor operating in aqueous acetic acid salts. Lithium, sodium and magnesium acetate solutions at various concentrations have been selected as electrolytes. Maximum operational voltage overall capacitor determined by several electrochemical techniques. Floating galvanostatic charge/discharge tests proved promising high voltages (1.5 V); capacitance values retained more than 80% initial value for all tested Additionally, due to ability operate...
This paper provides a comprehensive overview of the recent state art in research on neutral, water-based electrolyte, i.e., 1 mol⋅L−1 Li2SO4 solution, for sustainable electrochemical capacitors. The fundamental physicochemical properties aqueous electrolytic solutions (conductivity, viscosity, etc.) are discussed together with performance carbon-based In addition to critical review findings field, discusses new data obtained operando approach; discussion is supported by from quartz crystal...
This paper reports on the long-term performance of electrochemical capacitor operating in 1 mol⋅L−1 KI solution subjected to two ageing protocols, i.e., galvanostatic cycling and potentiostatic floating. Ageing tests have been performed at similar voltage conditions (1.5 V), estimated from coulombic energetic efficiency as well self-discharge analysis. The end-of-life criterion (80% initial capacitance retained) was same for both procedures. influence methodology structural textural changes...
This paper reports on the ageing mechanisms in symmetric, carbon/carbon electrochemical capacitors operating with a 1 mol⋅L−1 LiNO3 aqueous electrolyte. The carbon electrodes were subjected to constant polarization protocol (i.e., floating) at various voltages and analysed post-mortem by N2 sorption 77 K, Raman spectroscopy, Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), elemental analysis. approach allowed real capacitor performance deterioration be simulated....
In this study, carbon felt (CF) electrodes were chemically treated using alkali metal salt (potassium nitrate) in the molten state as a mild oxidizing agent. Various temperatures range of 380–500 °C and oxidation duration (up to 12 h) analyzed order find most appropriate conditions. As-prepared felts electrochemically investigated three-electrode setup well lab-scale vanadium redox flow battery (VRFB). The included additional in-situ potential measurements allowing measure polarization each...
Successful implementation of silicon nanostructures as suitable electrodes for microcapacitors performing at low temperatures (down to −40 °C) has been realized.
This paper reports the successful attempts of symmetric aqueous electrochemical capacitor (EC) lifespan extension. A novel exploitation procedure, i.e., alternate floating, is herein proposed. Since only positive electrode ages remarkably in EC systems with LiNO3 as electrolyte, it demonstrated that polarization allows properties negative to be fully exploited. In our approach both electrodes play role and one alternately; carbon were subjected standard voltage-holding polarization. To...
The concept of a double-redox electrochemical capacitor operating in an aqueous electrolyte.
A comprehensive comparison of electrochemical capacitors (ECs) with various aqueous alkali metal sulfate solutions (Li2SO4, Na2SO4, Rb2SO4, and Cs2SO4) is reported. The EC a less conductive 1 mol L-1 Li2SO4 solution demonstrates the best long-term performance (214 h floating test) compared to highly Cs2SO4 (200 h). Both positive negative electrodes are affected by extensive oxidation hydrogen electrosorption, respectively, during aging process, as proven SBET fade. Interestingly, carbonate...
Electrochemical capacitors are attractive power sources, especially when they able to operate at high frequency (high current regime). In order meet this requirement their constituents should be made of conductivity materials with a suitable porosity. study, enhanced and simultaneously capacitance (120 F g−1 1 Hz or 10 A g−1) electrode material obtained from carbonized adenine precursor is presented. micro/mesoporous character the carbon optimal pore size ratio surface area was proven by...
Supercapacitors are essential components for energy storage devices in many fields, including renewable systems, electric vehicles, and portable electronics [1]. Carbon nanotube arrays have shown great promise use supercapacitors due to their high surface area excellent electrical conductivity. However, the specific capacitance of these needs be increased improve overall supercapacitor. This study presents an innovative approach enhance on-chip vertically-aligned carbon (VACNT) structures...
Electrochemical capacitors (ECs) are high-power energy storage devices able to operate for thousands of cycles. Nevertheless, their calendar and cycle life is limited, especially when high voltage applied. On the other hand, that parameter (voltage, U) significantly increases values according equation E=0.5CU 2 . Therefore, there a particular need understanding ageing performance fade reasons in order prolong supercapacitor operation. Herein, effect ageing-related phenomena water-based ECs...