Article
Energy & Fuels
Nilufer Kocyigit, Metin Gencten, Mutlu Sahin, Yucel Sahin
Summary: The Ce/Cr redox flow battery system was experimentally studied for the first time in an aqueous acidic medium, providing valuable data for potential alternative redox couples in redox flow batteries through optimization of acid and active ion concentrations, as well as analysis of electrode surface morphology. Results showed promising cell potential and discharge capacity values, indicating the potential for further exploration of alternative redox couples in redox flow batteries.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Electrochemistry
Hurmus Gursu, Metin Gencten, Yucel Sahin
Summary: Phosphorus-doped graphene-based electrodes for VRFB positive electrodes show promising potential in significantly improving discharge capacity and energy efficiency.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Stepan Halada, Jakub Zlatnik, Petr Mazur, Jiri Charvat, Zdenek Slouka
Summary: Carbon-based nanostructured materials possess good electrochemical activity, but it is challenging to screen and test their activity efficiently. Creating a fixed bed on a planar current collector in a specially designed electrochemical cell solves this problem.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Zeyu Xu, Mingdong Zhu, Kaiyue Zhang, Xihao Zhang, Lixin Xu, Jianguo Liu, Tao Liu, Chuanwei Yan
Summary: Finite element simulations were used to guide the construction direction of electrode structures, leading to the successful construction of flow channels with high specific surface areas, enhancing the performance of VRFBs. The quenching-cracking strategy, deep learning technique, and fine structural modulation played key roles in achieving consistent and efficient electrode structures.
ENERGY STORAGE MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Erik Schroeter, Christian Stolze, Adrian Saal, Kristin Schreyer, Martin D. Hager, Ulrich S. Schubert
Summary: This study investigates an all-organic Nernstian potential-driven redox targeting system that combines a single-electrode material from organic radical batteries with a single redox couple of an aqueous, organic redox flow battery. The experimental results demonstrate that 78-90% of the theoretical capacity of the electrode material from the organic radical battery can be addressed when it is used as the redox target in the electrolyte tank of an operating aqueous organic redox flow battery.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Meng-Yue Lu, Wei-Wei Yang, Zhi-Kuo Zhang, Yong-Jian Yang, Qian Xu
Summary: This study proposes the use of an electrodeposited-lead electrode to improve the charge-discharge performance of vanadium redox flow batteries. The results show that the electrodeposited-lead electrode significantly enhances the electrochemical activity of the VO2+/VO+2 couple and increases the energy efficiency of the battery.
ELECTROCHIMICA ACTA
(2022)
Article
Electrochemistry
Trent A. Weiss, Gang Fan, Bertrand J. Neyhouse, Evan B. Moore, Ariel Furst, Fikile R. Brushett
Summary: Redox flow batteries (RFBs) face challenges due to complex failure modes, such as membrane crossover, leading to reduced capacity and cycling efficiency. Redox-active oligomers (RAOs) are proposed as a solution, but their impact on flow cell performance is not well understood. This study shows that oligomeric derivatives of TEMPO have lower diffusivities but maintain good charge transfer characteristics. The variations in mass transport rates lead to differences in flow cell polarization and cycling performance.
BATTERIES & SUPERCAPS
(2023)
Article
Nanoscience & Nanotechnology
Kausik Chanda, Soumen Maiti, Samrat Sarkar, Partha Bairi, Subhasish Thakur, Kausik Sardar, Nripen Besra, Nirmalya Sankar Das, Kalyan Kumar Chattopadhyay
Summary: The complex heterostructure of CuCo2O4 and MnO2 synthesized on flexible carbon fabric demonstrated high specific capacitance and stable rate capability, utilizing the geometrically intricate design. Optimization of the hybrid sample led to the specific capacitance of 1458 F/g at 0.5 A/g with stable rate capability and 93% retention of initial capacitance value after 5000 cycles, highlighting the superior electrochemical performance compared to pristine samples. The flexible symmetric solid-state supercapacitor achieved high gravimetric capacitance of 181.3 F/g and a high energy density of 64.1 Wh/kg, showing the impact of amalgamation of low dimensional nanoform in a geometrically intricate hybrid on device performance maximization.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Hyebin Kim, Jung S. Yi, Doohwan Lee
Summary: The study investigates the marked electrocatalytic effects of two-step B and O atomic doping of graphite-felt electrodes for vanadium redox reactions in a vanadium redox flow battery. By controlling the doping sequence and temperature via thermochemical reactions, the kinetic significance of the B and O surface centers for the reactions is identified, leading to improved catalytic activity and specific charge-discharge capacity of the electrodes. With a two-step O and B doping configuration, the B/O-GF electrode shows significantly higher voltage efficiency compared to pristine-GF, demonstrating the potential for enhanced performance in VRFB applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Electrochemistry
Fariba Alimola, Nasser Arsalani, Iraj Ahadzadeh
Summary: In this study, a new PDs-CoO nanocomposite was successfully synthesized as an electrode material for supercapacitors. The nanocomposite exhibits excellent electrical conductivity, high specific pseudocapacitance, and good cyclic stability. The experimental results confirm its promising electrochemical performance.
ELECTROCHIMICA ACTA
(2022)
Article
Electrochemistry
Alexandros Pasadakis-Kavounis, Funda Arslan, Mads Radmer Almind, David Aili, Johan Hjelm
Summary: In this study, a series of polybenzimidazole-polyvinylchloride polymer blends decorated with different quaternary ammonium groups were investigated. The blend with 90% polybenzimidazole content and decorated with DABCO showed superior performance, including low polarization resistance, low swelling, and high stability in acidic media. This suggests that quaternary ammonium functionalized polybenzimidazole-polyvinylchloride systems are excellent candidates for modification or fabrication of thinner membranes to reduce membrane resistance without compromising vanadium blocking properties.
BATTERIES & SUPERCAPS
(2023)
Article
Chemistry, Analytical
Pavel Loktionov, Roman Pichugov, Dmitry Konev, Mikhail Petrov, Alla Pustovalova, Anatoly Antipov
Summary: Optical spectroscopy is a promising method to address the challenge of monitoring the state of charge in vanadium redox flow batteries (VRFB), but existing approaches have limitations, such as limited applicability, uncertainty in accounting for electrolyte imbalance, and applicability restrictions for mixed acid electrolytes. The proposed method based on deconvolution of electrolyte absorption spectra successfully determines the SoC of VRFB and shows good accuracy in determining vanadium concentration and SoC in both half-cells. Additionally, this method allows for obtaining complex spectra, including new complexes in both positive and negative electrolytes.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Pavel Loktionov, Dmitry Konev, Roman Pichugov, Mikhail Petrov, Anatoly Antipov
Summary: An operando coulometric analysis method for assessing vanadium redox flow battery (VRFB) electrolyte is proposed, which detects the overall vanadium content and average oxidation state (AOS), and performs stably under imbalance conditions.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Ceramics
M. Shahsank, H. S. Bhojya Naik, H. N. Sumedha, G. Nagaraju
Summary: In this study, MoO3 nanoparticles were synthesized using tamarind seed powder as a novel fuel for a simple solution combustion method. The presence of carbon in the MoO3 nanoparticles provided excellent electrochemical performance, with initial discharge capacity of 1171 mAhg(-1) and stable capacity of 162 mAhg(-1) after 200 cycles, with a close to 100% Columbic efficiency.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Hyebin Kim, Jihun Paick, Jung S. Yi, Doohwan Lee
Summary: Heteroatom doping can enhance the electrokinetics of vanadium redox reactions in flow batteries, but this study found that the enhancements observed by p-type and n-type doping are primarily due to surface lattice defects. However, p-n type boron-nitrogen co-doping shows exceptional catalytic activity and significantly improves the efficiency and energy storage capacity of vanadium redox flow batteries.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Multidisciplinary
Betul Ok, Metin Gencten, Melih B. Arvas, Yucel Sahin
Summary: In this study, copper doped polyaniline and polypyrrole based materials were synthesized using an in situ chemical synthesis method, and their properties were characterized. The X-ray photoelectron spectroscopy analysis confirmed the doping of copper, and the scanning electron microscopy revealed the morphology of the copper doped conducting polymers. The study also showed that copper doping enhanced the capacitive properties of these materials.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Sibel Yazar, Melih Besir Arvas, Yucel Sahin
Summary: In this study, a Fe-doped polyaniline/dye-functional composite modified carbon felt electrode was synthesized, and the effect of acidic dye concentration on supercapacitor performance was investigated. The results showed that the capacitance increases due to the strong interaction between PANI and dye molecules, improving the performance of pseudocapacitive supercapacitors by providing potential redox materials.
Article
Chemistry, Multidisciplinary
Melih Besir Arvas, Hurmus Gursu, Metin Gencten, Yucel Sahin
Summary: In this study, S, N co-doped graphene-based electrodes were synthesized using Yucel's method. The prepared electrodes were characterized using spectroscopic, microscopic and electrochemical methods. The supercapacitor performances of the electrodes were evaluated through cyclic charge-discharge tests in specific electrolyte solutions, with the areal capacitance values varying with current density.
Article
Polymer Science
Yusuf Kahraman, Hurmus Gursu, Melih Besir Arvas, M. Giray Ersozoglu, Mohammadreza Nofar, A. Sezai Sarac, Yucel Sahin
Summary: In this study, S-doped graphene (SG) powders were prepared using a green, quick, and cheap method. The powders were used to prepare SG/polylactide (PLA) nanocomposites. The addition of low amounts of SG significantly improved the tensile strength and modulus of the nanocomposites. The applied potential and the structural properties of SGs had different effects on the final tensile properties of the nanocomposites.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Electrochemistry
Ebrar Dokur, Selen Uruc, Ozge Gorduk, Yucel Sahin
Summary: An electrochemical immunosensor using gold nanoparticles, EDOT, and Py was developed for sensitive detection of CEA. The sensor showed low-cost, selective, and rapid detection of CEA with excellent anti-interference ability against various substances. It is suitable for application in clinical screening.
Article
Materials Science, Multidisciplinary
Ayse Hacinecipoglu, Metin Gencten, Melih B. Arvas, Yucel Sahin
Summary: Thin films of cobalt oxides (CoO2, Co3O4) were prepared using the electrochemical method on pencil graphite and indium tin oxide surfaces, and the substrate effect on oxide formation was studied. The cobalt oxides were characterized using X-ray diffraction, Atomic force microscope, and Scanning electron microscope. The synthesis of cobalt oxide crystal structures was achieved on different substrates and at extremely low temperatures using cyclic voltammetry, suggesting the potential use of these electrodes in solar cell applications.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Electrochemistry
Sibel Yazar, Melih Besir Arvas, Yucel Sahin
Summary: Conducting polymer and carbon-based materials play important roles in supercapacitor applications, but their standalone use is limited. This study successfully synthesized supercapacitor electrodes with high specific capacitance and long-life performance.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Taskin Basili, Hilal Yildirim Kalyon, Metin Gencten, Mustafa Macit, Yucel Sahin
Summary: Novel oxime compounds and their complexes were synthesized and used as additives in the electrochemical preparation of poly(aniline-co-pyrrole). Spectroscopic characterization and performance testing were conducted on these materials and electrodes, demonstrating the potential of oxime compounds for high-performance supercapacitors.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Ebrar Dokur, Selen Uruc, Ozge Gorduk, Yucel Sahin
Summary: This study reports a new electrochemical sensor platform prepared using tetraoctylammonium ions (TOA(+)) for efficient determination of reduced beta-nicotinamide adenine dinucleotide (NADH). The sensor was characterized using various techniques and showed excellent analytical performance, including low detection limits, high sensitivity, stability, and specificity. The proposed TOA(+)/PGE-based sensor displayed good performance in detecting NADH levels in human blood samples, even in the presence of interfering species.
Article
Engineering, Electrical & Electronic
Melih Besir Arvas, Nilgun Karatepe, Metin Gencten, Yucel Sahin
Summary: Coin cell symmetrical supercapacitors were prepared using S,N co-doped graphene powders obtained through Yucel's Method with cyclic voltammetry. Characterization of the powders was performed through electrochemical, spectroscopic, and microscopic analysis. The specific capacitances of the coin cell symmetrical supercapacitors were determined through cyclic charge-discharge tests, with the highest specific capacitance reaching 188.3 F.g(-1), and the highest energy and power values being 163.4 Wh.kg(-1) and 2173.9 W.kg(-1), respectively.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Sezgin Yasa, Okyay Kumbasi, Melih Besir Arvas, Metin Gencten, Mutlu Sahin, Yucel Sahin
Summary: In this study, nitrogen doped graphene oxide (N-GO) and sulfur doped graphene oxide (S-GO) were synthesized and converted into composite form with polyaniline (PANI) to prepare triple composite electrode materials for supercapacitors. The heteroatom doped graphene oxides and PANI were characterized using spectroscopic and microscopic methods. The electrode materials showed excellent capacitive behavior and retained high efficiency after cyclic charge-discharge tests.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Selin Guemruekcue, Mukaddes oezcesmeci, Nilufer Kocyigit, Kerem Kaya, Ahmet Gul, Yuecel Sahin, Ibrahim oezcesmeci
Summary: Tridentate nitrogen donor ligands, such as 1,3-bis(2-pyridylimino)isoindole (BPIs), have been widely used in inorganic chemistry due to their easy synthesis, modifiable structure, and high stability. This study focused on the synthesis and characterization of a derivative of 1,3-bis(2-pyridylimino)isoindoline with a naphthoxy unit and its palladium complex. The modified electrodes, BPI-CF and PdBPI-CF, were investigated for their performance in a vanadium redox flow battery system, with discharge capacity maxima of approximately 301 mA h (1204 mA h L-1) and approximately 303 mA h (1212 mA h L-1) achieved, respectively.
DALTON TRANSACTIONS
(2023)
Review
Energy & Fuels
Sezgin Yasa, Ozan Aydin, Mohammed Al-Bujasim, Burak Birol, Metin Gencten
Summary: This article presents the most recent research on the recycling of active elements in Li-ion batteries, discussing the current techniques and procedures for recycling commonly used Li-ion battery types. It compiles and presents data on the effectiveness of different recycling processes and the reuse of recovered materials. The article aims to aid readers in their studies and research on the growing importance of recycling used Li-ion batteries.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Analytical
Nursel Olgac, Yucel Sahin, Lokman Liv
Summary: This article describes three novel electrochemical biosensing platforms for determining SARS-CoV-2 spike antigen. The platforms were characterized using various techniques and used to detect the antigen in clinical samples. The results showed that these biosensing platforms could be selectively and accurately used for COVID-19 diagnosis.
