Pub Date : 2024-10-29DOI: 10.1016/j.ijoes.2024.100855
V. Silambuselvi , P. Jeyabarathi , Navnit Jha , K. Angaleeswari , TRK Kumar , L. Rajendran
The mathematical model of facilitated transport systems in steady-state conditions is discussed. The nonlinear component associated with chemical reactions and diffusion in nonlinear equations forms the basis of this model. By solving the nonlinear equation using the Adomian decomposition method, we can obtain the analytical expression of the concentration of species. The simple expression of the facilitation factor ( ratio between the total flux of solute and that of the absence of carrier) is also reported. The parameters' influence on species concentration and facilitation factors are discussed. A good agreement is obtained when we compare the numerical results for all parameter values with new analytical results.
{"title":"Theoretical analysis of facilitated diffusion process in a liquid membrane: Adomian decomposition method","authors":"V. Silambuselvi , P. Jeyabarathi , Navnit Jha , K. Angaleeswari , TRK Kumar , L. Rajendran","doi":"10.1016/j.ijoes.2024.100855","DOIUrl":"10.1016/j.ijoes.2024.100855","url":null,"abstract":"<div><div>The mathematical model of facilitated transport systems in steady-state conditions is discussed. The nonlinear component associated with chemical reactions and diffusion in nonlinear equations forms the basis of this model. By solving the nonlinear equation using the Adomian decomposition method, we can obtain the analytical expression of the concentration of species. The simple expression of the facilitation factor ( ratio between the total flux of solute and that of the absence of carrier) is also reported. The parameters' influence on species concentration and facilitation factors are discussed. A good agreement is obtained when we compare the numerical results for all parameter values with new analytical results.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100855"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1016/j.ijoes.2024.100858
Liang Zhang , Jinming Wu , Mingli Xiao , Shuo Zhang , Shengchao Ren , Dongsheng Luo , Feihu Xi , Huan Liu , Yaoguang Li , Quansheng Li , Yanqiu Jing
This study presents a novel electrochemical aptasensor for the ultrasensitive detection of lead(II) ions in tobacco products. The sensor utilizes a G-quadruplex forming DNA aptamer (5′-GGGTGGGTGGGTGGGT-3′) immobilized on gold nanoparticles (AuNPs) with an average diameter of 73.2 nm. The aptamer-Pb2+ interaction, characterized by circular dichroism and isothermal titration calorimetry, revealed a dissociation constant of 0.28 ± 0.03 μM. Optimized sensor fabrication conditions included 1 μM aptamer concentration and 16-h incubation time. The aptasensor exhibited two linear ranges: 0.2072–103.6 μg/L and 103.6–1072 μg/L, with a detection limit of 37 ng/L. The sensor maintained selectivity in the presence of interfering ions at 100-fold higher concentrations. The sensor demonstrated excellent stability, retaining 92.1 % of its initial response after 30 days, and high reproducibility with an inter-batch RSD of 5.3 %. This aptasensor offers a promising platform for rapid and sensitive Pb2+ detection in complex matrices.
{"title":"Aptamer-functionalized gold nanoparticles for fast and selective electrochemical sensing of lead in tobacco","authors":"Liang Zhang , Jinming Wu , Mingli Xiao , Shuo Zhang , Shengchao Ren , Dongsheng Luo , Feihu Xi , Huan Liu , Yaoguang Li , Quansheng Li , Yanqiu Jing","doi":"10.1016/j.ijoes.2024.100858","DOIUrl":"10.1016/j.ijoes.2024.100858","url":null,"abstract":"<div><div>This study presents a novel electrochemical aptasensor for the ultrasensitive detection of lead(II) ions in tobacco products. The sensor utilizes a G-quadruplex forming DNA aptamer (5′-GGGTGGGTGGGTGGGT-3′) immobilized on gold nanoparticles (AuNPs) with an average diameter of 73.2 nm. The aptamer-Pb<sup>2+</sup> interaction, characterized by circular dichroism and isothermal titration calorimetry, revealed a dissociation constant of 0.28 ± 0.03 μM. Optimized sensor fabrication conditions included 1 μM aptamer concentration and 16-h incubation time. The aptasensor exhibited two linear ranges: 0.2072–103.6 μg/L and 103.6–1072 μg/L, with a detection limit of 37 ng/L. The sensor maintained selectivity in the presence of interfering ions at 100-fold higher concentrations. The sensor demonstrated excellent stability, retaining 92.1 % of its initial response after 30 days, and high reproducibility with an inter-batch RSD of 5.3 %. This aptasensor offers a promising platform for rapid and sensitive Pb<sup>2+</sup> detection in complex matrices.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100858"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1016/j.ijoes.2024.100853
J. Arul Vinayagan , P. Jeyabarathi , L. Rajendran , S.Murali Krishnan
A mathematical model of potentiometric enzyme electrodes of general shape for a steady-state condition has been proposed. Two nonlinear reaction-diffusion equations for the Michaelis-Menten equation are employed to create the model. These equations describe the amounts of substrates and products in the catalytic layer. Analytical expressions for substrate and product concentrations and the related flux response have been generated for all parameters using the three analytical techniques. The analytical solutions generated thoroughly characterize two kinetic parameters: the unsaturation/saturation parameter and the reaction/diffusion parameter.
The influence of the parameters on the biosensor sensitivity is also discussed. Numerical simulation (Scilab/Matlab) has been performed to validate the new analytical results. There is a noticeable good agreement between the theoretical and numerical results.
{"title":"Theoretical analysis of the steady-state responses of an innovative general flexible enzyme-electrode in potentiometric biosensors","authors":"J. Arul Vinayagan , P. Jeyabarathi , L. Rajendran , S.Murali Krishnan","doi":"10.1016/j.ijoes.2024.100853","DOIUrl":"10.1016/j.ijoes.2024.100853","url":null,"abstract":"<div><div>A mathematical model of potentiometric enzyme electrodes of general shape for a steady-state condition has been proposed. Two nonlinear reaction-diffusion equations for the Michaelis-Menten equation are employed to create the model. These equations describe the amounts of substrates and products in the catalytic layer. Analytical expressions for substrate and product concentrations and the related flux response have been generated for all parameters using the three analytical techniques. The analytical solutions generated thoroughly characterize two kinetic parameters: the unsaturation/saturation parameter and the reaction/diffusion parameter.</div><div>The influence of the parameters on the biosensor sensitivity is also discussed. Numerical simulation (Scilab/Matlab) has been performed to validate the new analytical results. There is a noticeable good agreement between the theoretical and numerical results.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100853"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.ijoes.2024.100856
Fuchun Sun , Ya Gao , Bin Yang , Yongcui Li , Yuzhen Wu , Suhui Sun , Zhe Ma , Beibei Jiang , Manman Hou
Carbon-coated sulfides have arisen as effective electrocatalysts for the hydrogen evolution reaction (HER) due to their unique electronic structure and high catalytic activity. However, incorporating two different dopants into the carbon matrix and ensuring uniform coating on the sulfide surface requires precise control and remain a challenge. Herein, using a Co-based zeolitic imidazolate framework (Co-ZIF) as both the Co source and the nano structural template, Co9S8 particles decorated on N,S-codoped carbon (Co9S8@NSC) have been synthesized by sequential oxidation-sulfidation strategy. High porosity and tunable structure of Co-ZIF allows for precise control over the morphology and composition of the material, resulting in a uniform coating of Co9S8 on the N,S-codoped carbon. Meanwhile, the doping of nitrogen and sulfur into carbon can modulate the electronic properties and surface chemistry of the carbon support, further enhancing the interaction between the catalyst and reactants. As expect, Co9S8@NSC exhibits an overpotential of 201 mV at 10 mA cm−2 in 0.5 M H2SO4. Interestingly, Co9S8@NSC also displays good stability with negligible potential loss for 10 h at the current density of 10 mA cm−2.
碳涂层硫化物因其独特的电子结构和高催化活性，已成为氢进化反应（HER）的有效电催化剂。然而，在碳基体中加入两种不同的掺杂剂并确保硫化物表面涂层的均匀性需要精确控制，这仍然是一项挑战。在此，我们采用钴基沸石咪唑酸盐框架（Co-ZIF）作为钴源和纳米结构模板，通过顺序氧化-硫化策略合成了装饰在掺杂 N、S 的碳（Co9S8@NSC）上的 Co9S8 颗粒。Co-ZIF 的高孔隙率和可调结构可精确控制材料的形态和组成，从而在 N、S-掺杂碳上形成均匀的 Co9S8 涂层。同时，在碳中掺入氮和硫可以调节碳载体的电子特性和表面化学性质，进一步增强催化剂与反应物之间的相互作用。正如预期的那样，Co9S8@NSC 在 0.5 M H2SO4 中 10 mA cm-2 的过电位为 201 mV。有趣的是，Co9S8@NSC 还显示出良好的稳定性，在 10 mA cm-2 的电流密度下，10 小时的电位损失可以忽略不计。
{"title":"MOF-derived cobalt sulfide particles decorated on N,S-codoped carbon as electrocatalysts for hydrogen production from water","authors":"Fuchun Sun , Ya Gao , Bin Yang , Yongcui Li , Yuzhen Wu , Suhui Sun , Zhe Ma , Beibei Jiang , Manman Hou","doi":"10.1016/j.ijoes.2024.100856","DOIUrl":"10.1016/j.ijoes.2024.100856","url":null,"abstract":"<div><div>Carbon-coated sulfides have arisen as effective electrocatalysts for the hydrogen evolution reaction (HER) due to their unique electronic structure and high catalytic activity. However, incorporating two different dopants into the carbon matrix and ensuring uniform coating on the sulfide surface requires precise control and remain a challenge. Herein, using a Co-based zeolitic imidazolate framework (Co-ZIF) as both the Co source and the nano structural template, Co<sub>9</sub>S<sub>8</sub> particles decorated on N,S-codoped carbon (Co<sub>9</sub>S<sub>8</sub>@NSC) have been synthesized by sequential oxidation-sulfidation strategy. High porosity and tunable structure of Co-ZIF allows for precise control over the morphology and composition of the material, resulting in a uniform coating of Co<sub>9</sub>S<sub>8</sub> on the N,S-codoped carbon. Meanwhile, the doping of nitrogen and sulfur into carbon can modulate the electronic properties and surface chemistry of the carbon support, further enhancing the interaction between the catalyst and reactants. As expect, Co<sub>9</sub>S<sub>8</sub>@NSC exhibits an overpotential of 201 mV at 10 mA cm<sup>−2</sup> in 0.5 M H<sub>2</sub>SO<sub>4</sub>. Interestingly, Co<sub>9</sub>S<sub>8</sub>@NSC also displays good stability with negligible potential loss for 10 h at the current density of 10 mA cm<sup>−2</sup>.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100856"},"PeriodicalIF":1.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1016/j.ijoes.2024.100854
Yan Liang , Jiahao Hu , Chaohang Lou , Tao Zhang
In view of the inherent complexity of the oilfield environment, improving the corrosion resistance of pipeline systems is a crucial factor in ensuring a stable energy supply. Copper as an alloying element has the potential to improve the corrosion resistance of other metal materials. In this study, 11Cr martensitic stainless steel with different copper contents was prepared and tempered at different temperatures to investigate its corrosion properties and corrosion mechanism in oilfield produced fluids. The electrochemical behavior of 11Cr martensitic stainless steel in two kinds of oilfield produced fluid was analyzed utilizing electrochemical testing methods. Electrochemical experiments have demonstrated that the specimen with 0.5 % copper content exhibited the lowest corrosion rate after tempering at 600℃, particularly in polymer flooding produced fluid. Furthermore, the polarization curve and EIS analysis indicated that copper content and tempering temperature exerted a significant effect on corrosion resistance. The result from the surface morphology examination indicate that the dispersed precipitation of copper elements significantly improves the corrosion resistance of martensitic stainless steels.
{"title":"Electrochemical corrosion behavior of martensitic stainless steel in an oilfield environment","authors":"Yan Liang , Jiahao Hu , Chaohang Lou , Tao Zhang","doi":"10.1016/j.ijoes.2024.100854","DOIUrl":"10.1016/j.ijoes.2024.100854","url":null,"abstract":"<div><div>In view of the inherent complexity of the oilfield environment, improving the corrosion resistance of pipeline systems is a crucial factor in ensuring a stable energy supply. Copper as an alloying element has the potential to improve the corrosion resistance of other metal materials. In this study, 11Cr martensitic stainless steel with different copper contents was prepared and tempered at different temperatures to investigate its corrosion properties and corrosion mechanism in oilfield produced fluids. The electrochemical behavior of 11Cr martensitic stainless steel in two kinds of oilfield produced fluid was analyzed utilizing electrochemical testing methods. Electrochemical experiments have demonstrated that the specimen with 0.5 % copper content exhibited the lowest corrosion rate after tempering at 600℃, particularly in polymer flooding produced fluid. Furthermore, the polarization curve and EIS analysis indicated that copper content and tempering temperature exerted a significant effect on corrosion resistance. The result from the surface morphology examination indicate that the dispersed precipitation of copper elements significantly improves the corrosion resistance of martensitic stainless steels.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100854"},"PeriodicalIF":1.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.ijoes.2024.100852
D. Sujatha , R.Usha Rani , G. Vennila , A. Marimuthu , M. Renugadevi , L. Rajendran
This paper discusses the steady-state nonlinear reaction-diffusion processes in porous catalysts. This model is based on a nonlinear second-order differential equation that includes a nonlinear term associated with the Michaelis-Menten and non-Michaelis-Menten kinetics of the reaction. The nonlinear equations can be approximately solved using the Taylors series, modified Taylors series and Akabri-Ganji technique to obtain the concentration of dissolved species. The influence of the half-saturation parameter and the characteristic reaction rate on concentration is explored. Sensitivity analysis of parameters is discussed. Our analytical findings were compared with numerical solutions.
{"title":"Understanding the nonlinear reactive transport model in porous catalysts","authors":"D. Sujatha , R.Usha Rani , G. Vennila , A. Marimuthu , M. Renugadevi , L. Rajendran","doi":"10.1016/j.ijoes.2024.100852","DOIUrl":"10.1016/j.ijoes.2024.100852","url":null,"abstract":"<div><div>This paper discusses the steady-state nonlinear reaction-diffusion processes in porous catalysts. This model is based on a nonlinear second-order differential equation that includes a nonlinear term associated with the Michaelis-Menten and non-Michaelis-Menten kinetics of the reaction. The nonlinear equations can be approximately solved using the Taylors series, modified Taylors series and Akabri-Ganji technique to obtain the concentration of dissolved species. The influence of the half-saturation parameter and the characteristic reaction rate on concentration is explored. Sensitivity analysis of parameters is discussed. Our analytical findings were compared with numerical solutions.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100852"},"PeriodicalIF":1.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.ijoes.2024.100851
Huibo Liu
This study presents a novel electrochemical aptasensor for the detection of methamphetamine, utilizing a biosynthesized graphene oxide-gold nanoparticle (GO-AuNP) composite. The nanocomposite was synthesized using Shewanella oneidensis MR-1, offering a green and cost-effective alternative to traditional chemical methods. Characterization by UV–vis spectroscopy, TEM, XRD, and FTIR confirmed the successful formation of the GO-AuNP composite, with AuNPs averaging 18.3 ± 3.7 nm in diameter uniformly distributed on GO sheets. The aptasensor was optimized for aptamer concentration (10 μM), incubation time (30 minutes), and pH (7.4). Electrochemical impedance spectroscopy measurements revealed a linear relationship between the change in charge transfer resistance and the logarithm of methamphetamine concentration from 0.5 nM to 500 nM. The aptasensor achieved a detection limit of 0.15 nM, surpassing many existing methods. Cross-reactivity studies with potential interferents showed minimal response, with all tested compounds exhibiting less than 15 % relative signal compared to methamphetamine. The sensor demonstrated good reproducibility (RSD = 4.8 %) and retained over 90 % of its initial response after 30 days of storage. Analysis of spiked urine samples yielded recovery rates between 96.8 % and 103.5 %, validating the aptasensor's potential for real-world applications in sports doping control and clinical diagnostics.
{"title":"Highly selective detection of methamphetamine in urine using biosynthesized graphene oxide-gold nanoparticle composite modified electrodes","authors":"Huibo Liu","doi":"10.1016/j.ijoes.2024.100851","DOIUrl":"10.1016/j.ijoes.2024.100851","url":null,"abstract":"<div><div>This study presents a novel electrochemical aptasensor for the detection of methamphetamine, utilizing a biosynthesized graphene oxide-gold nanoparticle (GO-AuNP) composite. The nanocomposite was synthesized using Shewanella oneidensis MR-1, offering a green and cost-effective alternative to traditional chemical methods. Characterization by UV–vis spectroscopy, TEM, XRD, and FTIR confirmed the successful formation of the GO-AuNP composite, with AuNPs averaging 18.3 ± 3.7 nm in diameter uniformly distributed on GO sheets. The aptasensor was optimized for aptamer concentration (10 μM), incubation time (30 minutes), and pH (7.4). Electrochemical impedance spectroscopy measurements revealed a linear relationship between the change in charge transfer resistance and the logarithm of methamphetamine concentration from 0.5 nM to 500 nM. The aptasensor achieved a detection limit of 0.15 nM, surpassing many existing methods. Cross-reactivity studies with potential interferents showed minimal response, with all tested compounds exhibiting less than 15 % relative signal compared to methamphetamine. The sensor demonstrated good reproducibility (RSD = 4.8 %) and retained over 90 % of its initial response after 30 days of storage. Analysis of spiked urine samples yielded recovery rates between 96.8 % and 103.5 %, validating the aptasensor's potential for real-world applications in sports doping control and clinical diagnostics.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100851"},"PeriodicalIF":1.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.ijoes.2024.100848
Hongzhi Jin , Dongxu Sun , Ming Wu , Dongshu Wu
The riser sections of offshore pipelines are subject to cathodic potentials, alternating wet-dry (AWD) cycles and stresses in the service environment. The hydrogen permeation of X80 offshore pipeline with different cathodic potentials, dry/wet ratios, and constant tensile stress in AWD environment were investigated by the self made experimental equipment, which includes the three modules, i.e., the constant stress loading, the two-component cell hydrogen permeation, and AWD environment. Results showed that hydrogen permeation current fluctuates with the AWD, which is different from that in the bulk solution. In one AWD cycle, the permeation increases in the wetting stage and decreases in the dry stage. The smaller the dry/wet ratio, the longer the hydrogen permeation current keeps high level which is caused by the dense corrosion product layer. The hydrogen permeation currents in the elastic stress are greater than those in the plastic deformation, and unstressed conditions is the smallest.
{"title":"Hydrogen permeation behavior of X80 pipeline steel under alternating wet-dry environment in the South China Sea","authors":"Hongzhi Jin , Dongxu Sun , Ming Wu , Dongshu Wu","doi":"10.1016/j.ijoes.2024.100848","DOIUrl":"10.1016/j.ijoes.2024.100848","url":null,"abstract":"<div><div>The riser sections of offshore pipelines are subject to cathodic potentials, alternating wet-dry (AWD) cycles and stresses in the service environment. The hydrogen permeation of X80 offshore pipeline with different cathodic potentials, dry/wet ratios, and constant tensile stress in AWD environment were investigated by the self made experimental equipment, which includes the three modules, i.e., the constant stress loading, the two-component cell hydrogen permeation, and AWD environment. Results showed that hydrogen permeation current fluctuates with the AWD, which is different from that in the bulk solution. In one AWD cycle, the permeation increases in the wetting stage and decreases in the dry stage. The smaller the dry/wet ratio, the longer the hydrogen permeation current keeps high level which is caused by the dense corrosion product layer. The hydrogen permeation currents in the elastic stress are greater than those in the plastic deformation, and unstressed conditions is the smallest.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100848"},"PeriodicalIF":1.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-23DOI: 10.1016/j.ijoes.2024.100846
Ying Geng , Chun-yong Zhang , Lin Zhu , Hao-yu Wang , Ji-rong Bai , Jing-jing Huang , Zhen-long Zhao
Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co3O4@Mn3O4/Mn2O3 catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec‐1, by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg-1 and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.
{"title":"Catalytic Properties of PEDOT-Co3O4@Mn3O4/Mn2O3 Nanomaterials in HER Reactions and Their Application in Capacitors.","authors":"Ying Geng , Chun-yong Zhang , Lin Zhu , Hao-yu Wang , Ji-rong Bai , Jing-jing Huang , Zhen-long Zhao","doi":"10.1016/j.ijoes.2024.100846","DOIUrl":"10.1016/j.ijoes.2024.100846","url":null,"abstract":"<div><div>Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co<sub>3</sub>O<sub>4</sub>@Mn<sub>3</sub>O<sub>4</sub>/Mn<sub>2</sub>O<sub>3</sub> catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec<sup>‐1</sup>, by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg<sup>-1</sup> and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100846"},"PeriodicalIF":1.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.ijoes.2024.100847
Ahmed A. Al-OWAIS , Ibrahim S. El-Hallag , Elsayed El-Mossalamy
This study reports the electrochemical investigation of the Anthracen-9-ylmethylene derivatives (anthracen-9-ylmethylene-(3,4-dime-thyl-isoxazol-5-yl)-amine) compound on a glassy carbon electrode (GCE), employing chronoamperometry, chronocoulometry, convolutive voltammetry transforms, and numerical simulation techniques. The experiments were performed in a solution containing 0.1 mol L−1 tetraethylammonium perchlorate (TEAP) in methylene chloride solvent (CH2Cl2). The oxidation process of the compound involved two sequential electron transfers. The first redox process involves the loss of a single electron transfer, leading to the formation of a radical cation followed by an irreversible chemical step, and the subsequent transformation of electron transfer produces a di-cation through an additional irreversible chemical process. The experimental kinetic parameters (α, ks, E°, D, and kc) were determined via the electrochemical techniques used. The numerical simulation method was used for confirmation and verification of the determined chemical and electrochemical parameters. The electrode pathway was found to follow an ECirrECirr mechanism, providing valuable insights into the examination electrochemical performance of Anthracen-9-ylmethylene derivatives' on a GC electrode. Examination of the anthracen-9-ylmethylene derivatives via chronocoulometry experiments confirmed that the mass transport of the investigated species is controlled by the diffusion process.
{"title":"The electrochemical characteristics of derivatives of anthracen-9-ylmethylene at a glassy carbon electrode in methylene chloride","authors":"Ahmed A. Al-OWAIS , Ibrahim S. El-Hallag , Elsayed El-Mossalamy","doi":"10.1016/j.ijoes.2024.100847","DOIUrl":"10.1016/j.ijoes.2024.100847","url":null,"abstract":"<div><div>This study reports the electrochemical investigation of the Anthracen-9-ylmethylene derivatives <strong>(</strong>anthracen-9-ylmethylene-(3,4-dime-thyl-isoxazol-5-yl)-amine) compound on a glassy carbon electrode (GCE), employing chronoamperometry, chronocoulometry, convolutive voltammetry transforms, and numerical simulation techniques. The experiments were performed in a solution containing 0.1 mol L<sup>−1</sup> tetraethylammonium perchlorate (<em>TEAP</em>) in methylene chloride solvent (<em>CH</em><sub>2</sub><em>Cl</em><sub>2</sub>). The oxidation process of the compound involved two sequential electron transfers. The first redox process involves the loss of a single electron transfer, leading to the formation of a radical cation followed by an irreversible chemical step, and the subsequent transformation of electron transfer produces a di-cation through an additional irreversible chemical process. The experimental kinetic parameters (<em>α</em>, <em>k</em>s, <em>E</em>°, <em>D</em>, and <em>k</em>c) were determined via the electrochemical techniques used. The numerical simulation method was used for confirmation and verification of the determined chemical and electrochemical parameters. The electrode pathway was found to follow an <em>EC</em><sub>irr</sub><em>EC</em><sub>irr</sub> mechanism, providing valuable insights into the examination electrochemical performance of Anthracen-9-ylmethylene derivatives' on a GC electrode. Examination of the anthracen-9-ylmethylene derivatives via chronocoulometry experiments confirmed that the mass transport of the investigated species is controlled by the diffusion process.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100847"},"PeriodicalIF":1.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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