Article
Chemistry, Analytical
L. K. Bieniasz
Summary: The study develops a theory on chronoamperometric Faradaic current at cylindrical electrodes, with two procedures designed to compute special functions in the theory. Numerical experiments show that the effect of unequal diffusion coefficients on the current is significant, even when the difference is small.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: The theory of single potential step chronoamperometry for the ErevCirr reaction mechanism involving reversible charge transfer and an (pseudo-) first order irreversible homogeneous follow-up chemical reactions at a cylindrical wire electrode has not been previously considered in literature, except for fragmentary results. A new theory is presented in this paper, with numerical procedures elaborated and implemented in C++ to efficiently compute a special trivariate function to describe nonlimiting Faradaic current. The effects of electrode curvature and homogeneous reaction rate constant on the current are briefly investigated and discussed using the freely available code for the procedures.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: This paper develops a general theory for large-signal controlled-potential experiments for the catalytic ErevCrev ' mechanism at cylindrical wire electrodes, with numerical procedures implemented for computing special functions related to chronoamperometric and cyclic voltammetric currents. The procedures are fast, accurate, and can be useful for validating digital simulation methods for electrochemistry and analyzing experimental data.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Electrochemistry
L. K. Bieniasz
Summary: This paper investigates the single potential step chronoamperometry for the CrevErev and ErevCrev reaction mechanisms at planar, spherical, and cylindrical electrodes involving reversible electrochemical and reversible homogeneous chemical reactions. The study finds that for a given electrode type, the currents for both reaction mechanisms can be described by the same mathematical function dependent on a mechanism-specific parameter gamma. Formulas for Laplace transforms of these functions are determined for the three electrode types studied. Numerical algorithms are described to calculate these functions reliably, efficiently, and accurately. The algorithms provide a maximum relative error of about 10(-15) and take computational time ranging from 10(-6) s to 10(-2) s per single function value. A C++ code implementing these algorithms is provided.
ELECTROCHIMICA ACTA
(2023)
Article
Mathematics, Applied
L. K. Bieniasz, S. McKee, B. D. Sleeman
Summary: This study discusses the application of Jaeger integrals in various physical phenomena and introduces a new integral that can be perceived as a generalization of the J(0,1;t) integral. The paper also presents a method to compute this integral with high precision using standard floating point variables.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Chemistry, Analytical
Tim Tichter, Dirk Andrae, Christina Roth
Summary: The paper derives analytical solutions for cylindrical and hollow-cylindrical electrodes with reflective and transmissive boundaries using Laplace transformation techniques, as well as explicit equations for concentration profiles of a Cottrellian potential step experiment. These expressions are given in terms of infinite series involving Bessel functions, and it is shown that computing only a few terms of these series is sufficient for accurate calculation of the desired time-dependent mass-transfer function or current. This method renders the numerical inversion of Laplace transformations obsolete and provides a mathematical supplement to the recent theory.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: This paper presents a high-precision algorithm for simulating singular transients in chronoamperometry and cyclic voltammetry. The algorithm is applied to integral equations with diffusion and (pseudo-)first order homogeneous reactions, and simulations are conducted for three example cases. The results are successful when the parameters are moderate, but a divergence is observed when the parameters are too large due to unavoidable roundoff errors.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Review
Chemistry, Analytical
Ersin Demir, Hulya Silah, Bengi Uslu
Summary: This study reviews the electrochemical methods based on electrode modification with phthalocyanines and discusses their sensor applications in the determination of drugs, pesticides, organic materials, and metals.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Dianmei Song, Wei Xu, Yi-Ge Zhou
Summary: Traditional modified electrodes often suffer from catalytic particle aggregation and multilayered electrode surface due to the drop-casting method. We propose a new in situ modification approach by dipping the electrode in a suspension of diluted nanoparticles, which allows for spatial isolation of the nanoparticles on the electrode surface. The resulting modified electrode shows negligible nanoparticle aggregation, significantly improved average activity, and enhanced mass transport conditions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Analytical
Hulya Silah, Cem Erkmen, Ersin Demir, Bengi Uslu
Summary: This paper provides a comprehensive review of the most recent developments in indium tin oxide (ITO) based electrochemical chemosensors and biosensors. It focuses on the sensor applications and properties of modified ITO electrodes in the determination of biomarkers, pathogens, pesticides, drugs, etc., and discusses the future possibilities and prospects of ITO electrodes.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2021)
Article
Electrochemistry
L. K. Bieniasz
Summary: This study presents an extension of the theory of a chronoamperometric experiment for a reversible charge transfer and a pseudo-first order reversible homogeneous reaction in a catalytic mechanism. Diffusion transport is assumed on a planar electrode. The study focuses on the case when the diffusion coefficients of the redox couple members are unequal and the homogeneous reaction is reversible. The derived non-trivial expressions for the Laplace transform of the non-limiting Faradaic current involve doubly nested complex square roots and are inverted numerically. The results obtained are of interest in the studies of homogeneous redox catalysis for electrochemical energy sources.
ELECTROCHIMICA ACTA
(2023)
Article
Mathematics, Applied
Stephen J. Gardiner, Hermann Render
Summary: This paper establishes extension results for functions which are harmonic on a subdomain of an infinite cylinder and vanish on a relatively open subset of the cylindrical surface, contributing to the understanding of functions within cylindrical domains.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2022)
Article
Chemistry, Physical
Mohamed Abd-Elsabour, Abdulrahman G. Alhamzani, Mortaga M. Abou-Krisha
Summary: This article investigates the electrochemical oxidation of methanol at various nickel-modified electrodes in NaOH solution, and finds that the newly developed poly-p-PD/Ni(II)/GE electrode exhibits higher catalytic activity for methanol oxidation. The electrochemical activity and diffusion-controlled process at the surface of the poly-p-PD/Ni(II)/GE electrode are also analyzed.
Article
Mathematics, Applied
Javier Segura
Summary: The study characterizes the best bounds for ratios of modified Bessel functions in the form of B(alpha, beta, gamma, x) = (alpha + beta 2 + gamma 2x2)/x. By choosing appropriate alpha, beta, and gamma, and ensuring that B(alpha, beta, gamma, x) is a sharp approximation for (13,,(x) = I,,-1(x)/I,,(x) as x-+0+ (respectively x-+ +infinity), and that the graphs of B(alpha, beta, gamma, x) and (13,,(x) are tangent at some x = x* > 0, B(alpha, beta, gamma, x) becomes an upper (respectively lower) bound for (13,,(x) for any positive x, and it is optimal at x*. The same holds true for the ratio (13,,(x) = K,,+1(x)/K,,(x), but with interchanged upper and lower bounds (and slightly more restricted range for nu). Bounds with maximum accuracy at 0+ and +infinity are obtained in the limits x*-+ 0+ and x*-+ +infinity, and for these cases, coefficients have simple expressions. For finite and positive x*, uniparametric families of bounds are provided, which closely approximate the optimal bounds and maintain their confluence properties.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2023)
Article
Chemistry, Physical
Weiwei Zhang, Boli Nie, Meifang Wang, Shuanghao Shi, Lei Gong, Wenjie Gong, Hao Pang, Xiaowan Liu, Benzhe Li, Yuanyuan Feng, Yan-Chao Wu
Summary: The development of high-efficiency and green corrosion inhibitors for Q235 steel under acidic conditions is of great significance. Resveratrol was chemically modified to resveratro-3-O-beta-D-glucopyranoside (R3GP) to enhance its solubility and complexation ability with metal ions. The study found that R3GP showed superior inhibitive efficiency compared to traditional resveratrol, forming a corrosion-protective film on the steel surface and exhibiting stable adsorption capacity.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2017)
Article
Electrochemistry
L. K. Bieniasz
ELECTROCHIMICA ACTA
(2018)
Article
Electrochemistry
L. K. Bieniasz
ELECTROCHIMICA ACTA
(2018)
Correction
Chemistry, Analytical
L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2018)
Article
Chemistry, Analytical
D. Barnas, L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2018)
Article
Chemistry, Analytical
L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2018)
Article
Electrochemistry
L. K. Bieniasz
ELECTROCHIMICA ACTA
(2019)
Article
Electrochemistry
L. K. Bieniasz
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Analytical
D. Barnas, L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2019)
Article
Chemistry, Analytical
L. K. Bieniasz
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2019)
Article
Electrochemistry
L. K. Bieniasz
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: The study develops a theory on chronoamperometric Faradaic current at cylindrical electrodes, with two procedures designed to compute special functions in the theory. Numerical experiments show that the effect of unequal diffusion coefficients on the current is significant, even when the difference is small.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: This paper develops a general theory for large-signal controlled-potential experiments for the catalytic ErevCrev ' mechanism at cylindrical wire electrodes, with numerical procedures implemented for computing special functions related to chronoamperometric and cyclic voltammetric currents. The procedures are fast, accurate, and can be useful for validating digital simulation methods for electrochemistry and analyzing experimental data.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
L. K. Bieniasz
Summary: The theory of single potential step chronoamperometry for the ErevCirr reaction mechanism involving reversible charge transfer and an (pseudo-) first order irreversible homogeneous follow-up chemical reactions at a cylindrical wire electrode has not been previously considered in literature, except for fragmentary results. A new theory is presented in this paper, with numerical procedures elaborated and implemented in C++ to efficiently compute a special trivariate function to describe nonlimiting Faradaic current. The effects of electrode curvature and homogeneous reaction rate constant on the current are briefly investigated and discussed using the freely available code for the procedures.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Mathematics, Applied
Michael Vynnycky, Sean McKee, Leslaw Bieniasz
Summary: An analytical and numerical investigation was conducted on a nonlinear reaction-diffusion partial differential equation in models of transient controlled-potential experiments in electroanalytical chemistry, aiming to determine the relationship between the concentration of a chemical species and its flux at a reacting electrode. It was found that a known relation for the steady-state case could be used in a singular perturbation expansion for the time-dependent case, but encountering a phenomenon akin to switchbacking when trying to determine the second term to extend the validity of the solution.
SIAM JOURNAL ON APPLIED MATHEMATICS
(2021)
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)