Article
Chemistry, Physical
Rusiri Rathnasekara, Grant Mayberry, Parameswar Hari
Summary: In this study, the thermoelectric, electrochemical, and dielectric properties of four different ZnO morphologies were investigated. ZnO nanorods exhibited the most favorable properties in terms of thermoelectric, electrochemical, and dielectric performance.
Article
Chemistry, Physical
Gibson P. Scisco, Mark E. Orazem, Kirk J. Ziegler, Kevin S. Jones
Summary: The capacitances of electrochemical systems determined from cyclic voltammetry (CV) are affected by the constant-phase element (CPE) behavior, which can be illustrated by simulated circuits. The capacitance extracted from CV follows a power law relationship with sweep rate, and a critical sweep rate can be defined by comparing CV-obtained capacitance with that from electrochemical impedance spectroscopy (EIS) data, allowing for an effective time constant formulation for the circuits. Sweep rates at least two orders of magnitude below the critical rate should be used in CV to mitigate the influence of the system's time constant on the measured capacitance. Reporting CPE parameters R, Q, and alpha is recommended for more accurate comparisons of supercapacitors rather than capacitance vs. sweep rate data from CV measurements.
JOURNAL OF POWER SOURCES
(2021)
Article
Electrochemistry
N. Zolotareva, M. D. Grishin, Yu S. Panova, V. V. Sushchev, A. N. Kornev
Summary: The electrochemical reduction of a series of azines was studied using cyclic voltammetry. Different azines showed different reduction processes, some of which were reversible and some were irreversible. Important parameters, such as diffusion coefficients, transfer coefficients, electron transfer rate constants, and the Matsuda-Ayabe criteria of reversibility, were determined for these azines through experiments and calculations.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2022)
Article
Electrochemistry
Gabriel Boitel-Aullen, Laure Fillaud, Francois Huet, Iwona Nierengarten, Beatrice Delavaux-Nicot, Jean-Francois Nierengarten, Emmanuel Maisonhaute
Summary: The electrochemical behavior of a giant rotaxane with 10 electroactive ferrocene centers was studied using fast scan cyclic voltammetry and impedance measurements. The results showed that the redox centers are not equivalent, displaying different electron transfer rate constants possibly due to various conformations of the adsorbed molecule. Utilizing such systems in molecular devices effectively requires minimizing or controlling these dispersions.
Article
Chemistry, Multidisciplinary
Mohamed Awadein, Maxwell Sparey, Simon Grall, Ferry Kienberger, Nicolas Clement, Georg Gramse
Summary: We demonstrate the unprecedented sensitivity of microwave microscopy in probing local charge transfer reactions, visualizing surface reactions involving only a small number of molecules. Our heterodyne microwave sensing method enables highly sensitive local cyclic voltammetry (LCV) and local electrochemical impedance spectroscopy (LEIS) at the nanoscale. These techniques provide precise measurement of localized charge transfer kinetics, as illustrated in this study for a ferrocene self-assembled monolayer immersed in an electrolyte.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Physical
Muhammad Shafa, Iqbal Ahmad, Shahid Hussain, Muhammad Asif, Yi Pan, Rustem Zairov, Asma A. Alothman, Mohamed Ouladsmane, Zahid Ullah, Nabi Ullah, Chen Lai, Uzma Jabeen
Summary: A nanoalloy-based electrochemical sensor for H2O2 detection has been fabricated using chemical reduction methodology. The prepared samples were characterized by X-ray diffraction and scanning electron microscopy. Among all the compositions, Ag-Cu (9:1) nanoalloys showed the best performance in detecting H2O2.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Applied
Elmira Payami, Saeed Neshad, Alireza Aghaiepour, Reza Teimuri-Mofrad
Summary: This paper focuses on the synthesis of novel ferrocene-appended porphyrin architectures and their zinc metal complexes. Tetraferrocenylporphyrins were successfully synthesized via a direct tetramerization reaction, and related zinc complexes were prepared through a metalation reaction. The structures of the new organometallic compounds were confirmed, and their redox-active properties were characterized.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Chawki Awada, Hassan H. Hammud, Hawra A. Bukhamsin, Dolayl E. Al-Hudairi, Francesco Ruffino
Summary: In this study, a new electro-chemical sensor based on functionalized gold/graphene/Cu layers was developed for highly sensitive detection of glucose. The sensor showed increased sensitivity compared to standard sensors, as confirmed by surface enhanced Raman scattering and cyclic voltammetry measurements. The presence of 4-NTP molecules on the sensor surface improved its sensitivity for glucose detection. The sensor exhibited a dynamic range of 2.0-19.6 mM to 2.0-29.1 mM and a lower detection limit of 0.5 mM for glucose.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Naseem Akhtar, Malika Rani, Arshad Mahmood, Kashmala Tariq, G. Murtaza, Asma A. Alothman, Rahaf S. AL-zahrani, Sajid Ali, Naveed Kasuar Janjua, Aqeel Shah
Summary: This work successfully synthesized NaCr2O4/GO nanocomposite using co-precipitation method for energy storage applications. Characterizations such as SEM and XRD were performed to investigate the optical and structural properties. The nanocomposite showed reduced crystalline size and high specific capacitance, making it suitable for various applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Jose Rodrigo Quejigo, Benjamin Korth, Anne Kuchenbuch, Falk Harnisch
Summary: The study investigates the distribution of Geobacter spp. and their electrochemical performance within exemplary fixed-bed electrodes. Results show that approximately 10% of the bed volume, specifically near the current collector, achieves the majority of electroactivity. Despite Geobacter spp. dominating all sampled granules, engineered bed electrodes are needed to improve electron exchange between microorganisms and granules.
Article
Chemistry, Analytical
Simon M. Wikeley, Pablo Lozano-Sanchez, Marco Caffio, Tony D. James, Frank Marken
Summary: This paper presents the use of boronic acid-based synthetic organic receptor molecules attached to graphene in a new electrochemical sensor concept. The sensor utilizes surface redox polymer indicator displacement and graphene foam electrodes. The sensor shows a concentration-dependent Faradaic current response to lactic acid and can be optimized using impedance spectroscopy based on interfacial electron transfer resistance. Surface-active components from human serum are found to modify the sensor response without affecting its performance.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Firoz Shah Tuglak Khan, Amy L. Waldbusser, Maria C. Carrasco, Hadi Pourhadi, Shabnam Hematian
Summary: This study presents a facile strategy for preparing a series of ferricenium complexes with weakly coordinating anions, and thoroughly investigates their ground state electronic structures, revealing the significant impact of substituents on metal-ligand separations in oxidized species.
DALTON TRANSACTIONS
(2021)
Review
Chemistry, Physical
Samantha Michelle Gateman, Oumaima Gharbi, Hercilio Gomes de Melo, Kieu Ngo, Mirelle Turmine, Vincent Vivier
Summary: This article presents different techniques for experimentally determining the interfacial capacitance of an electrode for supercapacitor efficiency quantification. It discusses the apparent differences between the values obtained from cyclic voltammetry and electrochemical impedance spectroscopy analysis and the errors that can result from using constant phase element (CPE) analysis.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Chemistry, Analytical
Maria G. Trachioti, Alexandros Ch. Lazanas, Mamas I. Prodromidis
Summary: This article presents the most commonly used methods for calculating electrode electroactive area (A) and heterogeneous electron transfer rate constants (k(0)), emphasizing the importance of considering these parameters.
Article
Chemistry, Physical
Gururaj Kudur Jayaprakash, B. E. Kumara Swamy, Shashanka Rajendrachari, S. C. Sharma, Roberto Flores-Moreno
Summary: Cationic surfactants increase the number of surface active electron transfer (ET) sites on the carbon paste electrode (CPE) surface. A dual descriptor approach is proposed to locate the redox-active sites of different surfactants in a single plot, avoiding the need to separately plot oxidation and reduction sites. Results indicate that cetylpyridinium significantly increases the maximum number of ET sites on the CPE surface compared to other surfactants.
JOURNAL OF MOLECULAR LIQUIDS
(2021)