Article
Electrochemistry
Luke Gundry, Gareth Kennedy, Jonathan Keith, Martin Robinson, David Gavaghan, Alan M. Bond, Jie Zhang
Summary: In this study, a computer program was developed using mathematical optimization and Bayesian inference algorithms to parameterize large amplitude AC voltammetric data for quantifying parameters and uncertainties in complex electrochemical reactions. The harmonic based Bayesian inference methods outperformed other methods in parameterizing the thermodynamics and electrode kinetics of the close to reversible processes. The study confirmed the robustness of the objective functions and validated the Bayesian inference methods using noisy synthetic and experimental data.
Article
Chemistry, Analytical
Ghadeer A. R. Y. Suaifan, Mohammad F. Khanfar, Mayadah B. Shehadeh, Asmaa Alnajajrah, Raghad Abuhamdan, Sameer Ahmad Hasan
Summary: This study successfully developed an electroanalytical electrode for the detection of albendazole (ABZ) active ingredient in pharmaceutical dosage form and contaminated animal-derived products. The modified electrode demonstrated high sensitivity and applicability, making it suitable for quality control in the pharmaceutical and food industry.
Review
Chemistry, Multidisciplinary
Si-Xuan Guo, Cameron L. Bentley, Minkyung Kang, Alan M. Bond, Patrick R. Unwin, Jie Zhang
Summary: This article introduces two advanced spatiotemporal voltammetric techniques for electrocatalytic studies, which provide important insights into the electrochemical reduction of CO2. Fourier transformed large-amplitude alternating current voltammetry allows the resolution of rapid electron-transfer processes, while scanning electrochemical cell microscopy provides high-resolution activity maps and potentiodynamic movies of catalyst surfaces.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Electrochemistry
Kelline Alaide Pereira Sousa, Franciele de Matos Morawski, Carlos Eduardo Maduro de Campos, Renato Luis Tamme Parreira, Mauricio Jeomar Piotrowski, Glaucio Regis Nagurniak, Cristiane Luisa Jost
Summary: Theoretical and electrochemical behavior of the herbicide fluometuron was investigated using a glassy carbon electrode for the first time. The study found that fluometuron exhibited an irreversible profile with a well-defined anodic peak through cyclic voltammetry. The presence of defects on the electrode surface induced the dissociation and adsorption of fluometuron, affecting the electroanalysis. Differential pulse voltammetry was successfully employed for the determination of fluometuron under optimized conditions.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Izabela Bargiel, Joanna Smajdor, Anna Gorska, Beata Paczosa-Bator, Robert Piech
Summary: The newly developed voltametric method for highly sensitive propranolol determination showed good linearity and detection limit in experiments, high recovery rates in real samples, and good signal repeatability.
Article
Automation & Control Systems
Chengcheng Li, Junhao Zhang, He Wen
Summary: An accurate and fast amplitude estimation method for sine-waves distorted by harmonics and noise is proposed in this article, using a three-point interpolation discrete Fourier transform method based on maximum sidelobe decay windows. The proposed method is accelerated by a guaranteed stable recursive method. The impact of noise on the amplitude estimation and the error caused by spectral interference are investigated, verifying the accuracy and effectiveness of the proposed method through simulation and experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Chemistry, Analytical
Jessica Scremin, Gabriel J. Mattos, Robert D. Crapnell, Samuel J. Rowley-Neale, Craig E. Banks, Elen R. Sartori
Summary: A novel electrochemical sensor utilizing a modified glassy carbon electrode covered with a poly(allylamine hydrochloride) film was proposed in this study, allowing for simultaneous determination of dopamine, paracetamol, amlodipine, and rosuvastatin with linear concentration ranges and low detection limits. This sensor showed successful application in environmental, pharmaceutical, and biological samples for the simultaneous determination of these analytes.
Article
Chemistry, Physical
Joanna Wasag, Malgorzata Grabarczyk
Summary: A copper film modified glassy carbon electrode and a novel copper film with carbon nanotubes modified screen-printed electrode were used for anodic stripping voltammetric measurement of ultratrace levels of Cd(II). The optimal electroanalytical performance of the working electrodes was achieved in electrolyte 0.1 M HCl and 2 x 10(-4) M Cu(II), with detection limits and repeatability values established for both types of electrodes. The calibration curves showed linear ranges for trace determination of cadmium in different environmental water samples.
Article
Chemistry, Multidisciplinary
Alister R. Dale-Evans, Martin J. Robinson, Henry O. Lloyd-Laney, David J. Gavaghan, Alan M. Bond, Alison Parkin
Summary: This study investigated the impact of pH on the reversible disulfide bond redox reaction in Escherichia coli hydrogenase maturation factor HypD. Surprisingly, the two-step one-electron transfer model continued to provide the best fit to the data across a range of pH, instead of transitioning to a concerted two-electron redox reaction as expected.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Analytical
Debora A. R. Moreira, Dilton M. Pimentel, Mariane O. B. Arrieiro, Sandro L. Barbosa, Rodrigo A. B. da Silva, Wallans T. P. dos Santos
Summary: This study reports the voltammetric behavior and determination of clonidine (CLO) using an unmodified glassy carbon electrode (GCE) for the first time. CLO exhibited only an irreversible oxidation process on the GCE at pH 12 (vs Ag/AgCl). The determination of CLO was optimized in 0.1 mol L-1 phosphate buffer solution at pH 12.0 using differential pulse voltammetry (DPV), providing a good linear range and low limit of detection for quality control of this drug in pharmaceutical samples. The proposed GCE-DPV method demonstrated good accuracy and analytical performance for CLO determination in pharmaceutical samples, offering a faster, simpler, and lower-cost alternative for quality control compared to other methods.
Article
Chemistry, Analytical
Negar Mohammadi, Manochehr Bahmaei, Amirabdolah Mehrdad Sharif
Summary: In this study, simultaneous electrochemical measurement of Acetaminophen, Tyrosine, and Codeine was discussed for the first time. A CuZnO-Fe3O4/rGO nanocomposite was prepared and successfully applied for the amendment of a glassy carbon electrode surface. The sensor demonstrated good performance in monitoring analytes in urine and human blood plasma, showing good agreement with results obtained using the HPLC method.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Sorina Negrea, Adelina A. Andelescu, Sorina Ilies (b Motoc), Carmen Cretu, Liliana Cseh, Mircea Rastei, Bertrand Donnio, Elisabeta Szerb, Florica Manea
Summary: A complex matrix nanoplatform based on a metallomesogen was successfully fabricated for a high-performance electrochemical hybrid sensor. The composition with the highest carbon nanotubes content exhibited the best electrochemical signal for uric acid detection, outperforming the commercial zinc electrode.
Article
Chemistry, Analytical
Vahid Riahifar, Nahid Haghnazari, Fatemeh Keshavarzi, Elahe Ahmadi
Summary: This study introduced a sensitive sensor for detecting MET based on a modified glassy carbon electrode using Fe3O4@PPy core-shell and ErGO. The sensor was characterized using FE-SEM and EIS, showing better analytical performance compared to other modified electrodes for MET detection. The sensor exhibited a wide linear range and low detection limit, with good reproducibility, sensitivity, and long-term performance, making it a promising candidate for MET determination in urine and serum samples.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Saeed Hajmalek, Shohreh Jahani, Mohammad Mehdi Foroughi
Summary: This study developed a FeNi3 nanoalloy-modified glassy carbon electrode for the individual and simultaneous detection of paracetamol and tramadol drugs, showing high selectivity and sensitivity. The synthesized electrode demonstrated multiple strengths, including simplicity, high stability, potent reproducibility, and excellent regeneration via simple polishing. FeNi3/GCE was successfully applied in serum and urine specimens and pharmaceutical preparations, confirming its practicality in detecting both paracetamol and tramadol.
Article
Materials Science, Multidisciplinary
Gloria E. Uwaya, Omolola E. Fayemi
Summary: In this study, electrochemical sensors for choline detection were fabricated using green-synthesized metal oxides combined with functionalized multi-walled carbon nanotubes. The sensors showed enhanced reactivity towards choline oxidation and were proven to be selective, reproducible, stable, and applicable for real sample sensing in choline dietary supplements.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Nanoscience & Nanotechnology
Laura Garcia-Quintana, Nagore Ortiz-Vitoriano, Haijin Zhu, Gene M. Nolis, Javier Herrero-Martin, Maria Echeverria, Juan Miguel Lopez del Amo, Maria Forsyth, Alan M. Bond, Patrick C. Howlett, Cristina Pozo-Gonzalo
Summary: A series of hybrid electrolytes composed of diglyme and ionic liquids have been investigated for Na-O-2 batteries. Different chemical compositions of the ILs affect the size, purity, and distribution of the discharge products. By controlling the physicochemical properties of the electrolyte and the speciation of Na+ and superoxide radical anion, the nucleation and growth phenomena, as well as electrolyte stability, can be optimized to improve battery performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Applied
Dilini Bopitiya, Sixuan Guo, Milton T. W. Hearn, Jie Zhang, Louise E. Bennett
Summary: Recently, it has been discovered that autoxidation mediated by ascorbic acid (AA) and other ingredients in energy beverages can generate hydrogen peroxide (H2O2). In this study, cyclic voltammetry and the FOX assay were used to monitor the production and stability of H2O2 generated by AA and redox-active ingredients at short and long incubation times, respectively. The levels of H2O2 in energy drinks were found to be stable or increased upon vessel opening. A predictive model showed that H2O2 peaked after 1 day and declined over time. This research highlights the importance of monitoring H2O2 levels and modifying formulations to avoid AA autoxidation in beverages.
Article
Nanoscience & Nanotechnology
Tengteng Qin, Jiaqi Niu, Xiaoqiang Liu, Chaoyao Geng, Anthony P. O'Mullane
Summary: Co/Fe bimetallic hydroxide nanosheets were deposited on polypyrrole nanotubes, followed by coating with polydopamine and zeolitic imidazolate frameworks (ZIF)-67 to form a composite catalyst precursor. After calcination, the resultant composite catalyst consisted of Co2Fe alloy nanoparticles, nitrogen-doped carbon nanotubes (NCNTs), and a Co-Nx activated carbon net. The composite exhibited high electrocatalytic activity in both the oxygen reduction and evolution reactions, making it a promising catalyst for Zn-air batteries and other applications. The superior catalytic activity was attributed to the synergy between the Co-Nx activated carbon net and Co2Fe alloy.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Peng Zhou, Si-Xuan Guo, Linbo Li, Tadaharu Ueda, Yoshinori Nishiwaki, Liang Huang, Zehui Zhang, Jie Zhang
Summary: In this study, highly efficient carbon supported Ni-MoO2 heterostructured catalysts were reported for the electrochemical hydrogenation (ECH) of phenol in 0.10 M aqueous sulfuric acid (pH 0.7) at 60 degrees C. Catalysts with high and low densities of oxygen vacancy (O-v) sites achieved the highest yields of cyclohexanol and cyclohexanone, 95% and 86%, respectively, with faradaic efficiencies of approximately 50%. The enhanced phenol adsorption strength attributed to the O-v density was found to be responsible for the superior catalytic efficiency. This work provides a promising avenue for the rational design of advanced electrocatalysts for the upgrading of phenolic compounds.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Junma Tang, Priyank Kumar, Zhenbang Cao, Jialuo Han, Torben Daeneke, Dorna Esrafilzadeh, Anthony P. O'Mullane, Jianbo Tang, Arifur Rahim, Kourosh Kalantar-Zadeh
Summary: By using mechanical energy as the stimulus and liquid metal gallium (Ga) together with nickel (Ni) particles as co-catalysts, renewable biofuels can be converted into mainly H-2 and C2H4 at near room temperature. This approach offers an alternative for H-2 and C2H4 production without high reaction temperatures and fossil fuel hydrocarbons.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Ziyang Wu, Ting Liao, Sen Wang, Wei Li, Binodhya Wijerathne, Wanping Hu, Anthony P. O'Mullane, Yuantong Gu, Ziqi Sun
Summary: In this study, Fe-doped MFe-LDHs (M = Co, Ni, Cu, Mn) were synthesized to investigate the influence of Fe on their electrocatalytic activity for the oxygen evolution reaction (OER). It was found that the Fe content had a significant impact on the catalytic performance, with an optimal Fe content resulting in the highest OER activity. Excess Fe, however, compromised the activity. Additionally, a volcano relationship was observed between the intermediate adsorption and Fe content, and intermediate adsorption capacitance was identified as a new activity descriptor for electrocatalysts.
MATERIALS HORIZONS
(2023)
Article
Environmental Sciences
Daniel K. Sarfoa, Arshdeep Kaura, David L. Marshall, Anthony P. O'Mullane
Summary: By using a simple copper electrode under cathodic conditions, reactive nitrosonium ions can be electrochemically generated for the degradation of different classes of synthetic organic dyes. This process can be achieved in an aqueous HNO3/KNO3 electrolyte at a relatively low cathodic potential of -0.5 V RHE at room temperature. The rapid decolorisation and mineralisation of various dye types have been demonstrated, showing potential for the remediation of polluted waterways.
Article
Chemistry, Physical
Anbrah E. Alzubidi, Alan M. Bond, Lisandra L. Martin
Summary: Published data suggests that sparingly soluble metal complexes of TCNQF1-n, where n=0, 1, 2, 4, can act as heterogeneous catalysts for the slow [Fe(CN)6]3- =4- -S2O2-3/S4O2-6 reaction in water. However, this study shows that the coordination polymer CuTCNQF4 can participate as a homogeneous catalyst through a small concentration of dissolved TCNQF1-4. UV-visible spectrophotometry was used to study the catalysis of the redox reaction in the presence of various catalysts. The findings suggest the need to reevaluate the mechanism of catalysis by TCNQF4 based solids.
Review
Chemistry, Multidisciplinary
Peng Zhou, Jie Zhang
Summary: Replacing conventional fossil resources with renewable raw materials is crucial for achieving carbon neutrality and alleviating the energy crisis. Biomass, due to its natural abundance and ability to fix CO2, is considered a promising candidate for this purpose. Electrochemical conversion of biomass offers advantages such as operating at ambient conditions, scalability, and green generation of equivalents. This review discusses recent progress in electrochemical transformation of biomass, including catalysts, strategies for enhancing efficiency, and mechanistic understanding.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Physical
Madhurima Barman, Venkata Sai Sriram Mosali, Alan M. Bond, Jie Zhang, A. Sarkar
Summary: This study investigates the effects of morphology, specific surface area, and relative content of Cu/Cu-oxide in CuO-derived Cu electrocatalysts on the current density and product formation during electrochemical carbon dioxide reduction reaction (eCO(2)RR). The results show that the Cu-content of the CuO-derived Cu electrocatalysts determines the type of products and their corresponding faradic efficiencies, with higher initial Cu-content resulting in higher faradic efficiencies at lower negative potentials. Furthermore, it is found that high Cu-content, regardless of morphology, is particularly important for the formation of methane and formate. Therefore, this study reveals the relative roles of specific surface area and Cu/CuO-content of CuO-derived Cu electrocatalysts on the current densities, product formation, and associated faradic efficiencies in eCO(2)RR.
Article
Chemistry, Physical
Anbrah E. Alzubidi, Alan M. Bond, Lisandra L. Martin
Summary: Mechanistic variation in catalysis through substituent-based redox tuning is well established. Fluorination of TCNQ provides a significant variation in the redox potentials of the TCNQF(n)(0/1-) and TCNQF(n)(1/2-) processes. The catalysis of the ferrocyanide-thiosulfate redox reaction in aqueous solution occurs via different mechanisms depending on the presence of fluorinated or non-fluorinated catalysts. Thermodynamic data explain the observed differences in the catalytic mechanisms for the two systems. CuTCNQF(n) coordination polymers, previously considered as insoluble and heterogeneous catalysts, are shown to act as homogeneous catalysts in the ferricyanide-thiosulfate reaction.
Article
Biochemistry & Molecular Biology
Ruchika Ojha, Peter C. Junk, Alan M. Bond, Glen B. Deacon
Summary: Pt-IV coordination complexes were synthesized by oxidizing the antitumor agent [Pt-II(p-BrC6F4)NCH2CH2NEt2}Cl(py)]. Experimental data showed that excess H2O2 and elevated temperature favored the oxidation of the ligand, while a smaller amount of H2O2 at room temperature favored the oxidation of the metal, resulting in the formation of platinum(IV) complexes.
Article
Materials Science, Multidisciplinary
Thom R. Harris-Lee, Enrico Della Gaspera, Frank Marken, Jie Zhang, Cameron L. Bentley, Andrew L. Johnson
Summary: Aerosol-assisted chemical vapor deposition (AACVD) was used to fabricate highly nanostructured mixed anatase-rutile phase TiO2 using new and bespoke precursors. The precursor syntheses involved two steps and the suitability for AACVD was assessed using thermogravimetric analysis. The resulting TiO2 films showed exceptional OH- oxidation performance and promise for use in photoanodes for water splitting applications.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Kanyarat Sarageng, Wanpawee Wongprom, Weesuda Noorith, Panjaphong Lertsathitphong, Jessica Crawford, Norased Nasongkla, Anthony P. O'Mullane, Benchaporn Lertanantawong
Summary: This study reports a simple and rapid method for synthesis of fluorescent gallium oxyhydroxide (GaOOH) nanoparticles from liquid Ga. The aspect ratio of the GaOOH nanoparticles can be controlled by varying the concentration of H2O2, solution pH, probe energy, and sonication time. Surface modification with cyclodextrin is also demonstrated to achieve biocompatibility for potential biomedical applications such as cell uptake and fluorescence imaging.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jonathan G. Love, Anthony P. O'Mullane, Fanny A. Boulaire, Ian D. R. Mackinnon
Summary: The transition from a fossil fuel economy to a hydrogen economy requires careful consideration of the technological and environmental implications. Fuel cell technologies have a significant impact on the sustainability of hydrogen energy pathways, and hydrogen derived from fossil fuels is not viable in a future economy. Therefore, a sustainable energy economy is more important.
SUSTAINABLE ENERGY & FUELS
(2022)