Pub Date : 2024-10-01DOI: 10.1016/j.ijoes.2024.100815
Issam saber , Khadija dahmani , Otmane Kharbouch , Zakia Aribou , Soumya Ferraa , Nouf H. Alotaibi , Marouane El-alouani , Rachid Hsissou , Basheer M. Al-Maswari , Mouhsine Galai , Mohamed Ebn Touhami , Zaroual Aziz , M.S. El youbi
During this study, two inorganic glasses materials with chemical compositions of (1−x) (2Bi2 O3 ⋅B2 O3)–x BaO (with x=0.2 (BiB-Ba0.2) and x=0.6 and (BiB-Ba0.6)) were synthetized characterized and investigated as viable, ecofriendly, and sustainable inhibitors to mitigate copper corrosion in a highly caustic solution containing 0.5 M H2SO4 solution. To evaluate inhibition processes, several techniques were employed, including potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM). Furthermore, the results show that the two inhibitors studied, BiB-Ba0.2 and BiB-Ba0.6, have higher corrosion inhibition efficiencies at the optimum concentration (10−3 M), reaching 91.2 % and 90.8 %, respectively. Moreover, these findings suggest that the two inorganic compounds elaborated possess inhibitors of mixed types. Copper oxide (Cu2O) production is markedly delayed when the two inhibitors are added to the acid medium, according to the findings of the XRD, FTIR, SEM/EDS, and AFM investigations. This outcome is explained by the development of a shield that lessens surface damage to copper metal, producing a smoother surface morphology.
{"title":"Enhancing copper corrosion resistance in highly caustic environments: Evaluation of environmentally friendly inorganic inhibitors and mechanistic insights","authors":"Issam saber , Khadija dahmani , Otmane Kharbouch , Zakia Aribou , Soumya Ferraa , Nouf H. Alotaibi , Marouane El-alouani , Rachid Hsissou , Basheer M. Al-Maswari , Mouhsine Galai , Mohamed Ebn Touhami , Zaroual Aziz , M.S. El youbi","doi":"10.1016/j.ijoes.2024.100815","DOIUrl":"10.1016/j.ijoes.2024.100815","url":null,"abstract":"<div><div>During this study, two inorganic glasses materials with chemical compositions of (1−x) (2Bi<sub>2</sub> O<sub>3</sub> ⋅B<sub>2</sub> O<sub>3</sub>)–x BaO (with x=0.2 (BiB-Ba<sub>0.2</sub>) and x=0.6 and (BiB-Ba<sub>0.</sub>6)) were synthetized characterized and investigated as viable, ecofriendly, and sustainable inhibitors to mitigate copper corrosion in a highly caustic solution containing 0.5 M H<sub>2</sub>SO<sub>4</sub> solution. To evaluate inhibition processes, several techniques were employed, including potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM). Furthermore, the results show that the two inhibitors studied, BiB-Ba<sub>0.2</sub> and BiB-Ba<sub>0.6</sub>, have higher corrosion inhibition efficiencies at the optimum concentration (10<sup>−3</sup> M), reaching 91.2 % and 90.8 %, respectively. Moreover, these findings suggest that the two inorganic compounds elaborated possess inhibitors of mixed types. Copper oxide (Cu<sub>2</sub>O) production is markedly delayed when the two inhibitors are added to the acid medium, according to the findings of the XRD, FTIR, SEM/EDS, and AFM investigations. This outcome is explained by the development of a shield that lessens surface damage to copper metal, producing a smoother surface morphology.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100815"},"PeriodicalIF":1.3,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424300","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 : 2024-09-21DOI: 10.1016/j.ijoes.2024.100809
Zhenghui Ge , Haoran Wu , Qifan Hu , Haitao Zhu , Yongwei Zhu
To improve the processing quality during the Jet electrochemical machining (JECM) process, a single-orifice nozzle and dual-orifice nozzles with different inclination angles were designed, where the fluid dynamic behavior was numerically simulated. Then, through the L49 (74) orthogonal design and error analysis, the influence of nozzle dimension on the flow field characteristics was analyzed. Finally, the nozzle with optimal structure and dimension was obtained and validated by experiment. Results show that the dual-orifice nozzles had better flow field uniformity than the single-orifice nozzle. In the dual-orifice nozzle, the increase of the inlet inclination angle can improve the flow field uniformity. The influence of the nozzle dimension parameters on the flow field uniformity is prioritized as follows: the outlet slit width > upper chamber diameter > the height of the inflow chamber > the height of the transition chamber. After optimization, the optimal dimension parameters were obtained under the upper chamber diameter of 16 mm, the jet outlet slit width of 0.4 mm, the height of the inflow chamber of 7 mm, and the height of the transition chamber of 23 mm. The flow velocity dispersions under the pressures of 0.3, 0.4, and 0.5 MPa can be reduced by 25.41 %, 25.17 %, and 28.16 %. The findings can help understand the flow behavior and guide the structure optimization for improving JECM quality.
{"title":"Uniformity enhancement of flow field through optimizing nozzle structure for jet electrochemical machining","authors":"Zhenghui Ge , Haoran Wu , Qifan Hu , Haitao Zhu , Yongwei Zhu","doi":"10.1016/j.ijoes.2024.100809","DOIUrl":"10.1016/j.ijoes.2024.100809","url":null,"abstract":"<div><div>To improve the processing quality during the Jet electrochemical machining (JECM) process, a single-orifice nozzle and dual-orifice nozzles with different inclination angles were designed, where the fluid dynamic behavior was numerically simulated. Then, through the L<sub>49</sub> (7<sup>4</sup>) orthogonal design and error analysis, the influence of nozzle dimension on the flow field characteristics was analyzed. Finally, the nozzle with optimal structure and dimension was obtained and validated by experiment. Results show that the dual-orifice nozzles had better flow field uniformity than the single-orifice nozzle. In the dual-orifice nozzle, the increase of the inlet inclination angle can improve the flow field uniformity. The influence of the nozzle dimension parameters on the flow field uniformity is prioritized as follows: the outlet slit width > upper chamber diameter > the height of the inflow chamber > the height of the transition chamber. After optimization, the optimal dimension parameters were obtained under the upper chamber diameter of 16 mm, the jet outlet slit width of 0.4 mm, the height of the inflow chamber of 7 mm, and the height of the transition chamber of 23 mm. The flow velocity dispersions under the pressures of 0.3, 0.4, and 0.5 MPa can be reduced by 25.41 %, 25.17 %, and 28.16 %. The findings can help understand the flow behavior and guide the structure optimization for improving JECM quality.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100809"},"PeriodicalIF":1.3,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320102","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 : 2024-09-20DOI: 10.1016/j.ijoes.2024.100804
Suben Sri Shiam , Jyotisman Rath , Amirkianoosh Kiani
Aqueous Zinc-ion Batteries (AZIBs) have garnered significant attention as promising alternatives to conventional lithium-ion batteries, owing to their inherent advantages such as high energy density, affordability, and non-flammability. Despite their potential, achieving high-performance cathode materials remains a challenge, necessitating a delicate balance between electrochemical properties and considerations of environmental toxicity and human health. This comprehensive review delves into recent advancements in transition metal oxide cathodes, focusing on their potential to address safety, toxicity, cost, and feasibility concerns. The importance of toxicity has emerged prominently in recent years, fueled by increasing awareness of environmental and health impacts associated with energy storage technologies. Meanwhile, feasibility encompasses not only the electrochemical performance of cathode materials but also considerations of scalability, cost-effectiveness, and compatibility with large-scale energy storage applications. The review begins with a brief yet focused overview of Zinc batteries, providing an accurate classification, foundational understanding, and overview of current challenges. It then delves into contemporary concerns surrounding toxicity, cost, and feasibility of transition metal oxide cathode materials. In subsequent sections, various works involving oxide cathodes of Ti, Fe, Mn, and other relevant transition metals are thoroughly examined for their ability to meet these considerations. Lastly, key strategies directed towards mitigation of toxicity issues and cost-effective development of ZIBs is provided along with valuable insights into the future direction of AZIB research and development.
{"title":"Advances in transition metal oxide cathodes for zinc-ion batteries – A review focusing on safety and toxicity","authors":"Suben Sri Shiam , Jyotisman Rath , Amirkianoosh Kiani","doi":"10.1016/j.ijoes.2024.100804","DOIUrl":"10.1016/j.ijoes.2024.100804","url":null,"abstract":"<div><div>Aqueous Zinc-ion Batteries (AZIBs) have garnered significant attention as promising alternatives to conventional lithium-ion batteries, owing to their inherent advantages such as high energy density, affordability, and non-flammability. Despite their potential, achieving high-performance cathode materials remains a challenge, necessitating a delicate balance between electrochemical properties and considerations of environmental toxicity and human health. This comprehensive review delves into recent advancements in transition metal oxide cathodes, focusing on their potential to address safety, toxicity, cost, and feasibility concerns. The importance of toxicity has emerged prominently in recent years, fueled by increasing awareness of environmental and health impacts associated with energy storage technologies. Meanwhile, feasibility encompasses not only the electrochemical performance of cathode materials but also considerations of scalability, cost-effectiveness, and compatibility with large-scale energy storage applications. The review begins with a brief yet focused overview of Zinc batteries, providing an accurate classification, foundational understanding, and overview of current challenges. It then delves into contemporary concerns surrounding toxicity, cost, and feasibility of transition metal oxide cathode materials. In subsequent sections, various works involving oxide cathodes of Ti, Fe, Mn, and other relevant transition metals are thoroughly examined for their ability to meet these considerations. Lastly, key strategies directed towards mitigation of toxicity issues and cost-effective development of ZIBs is provided along with valuable insights into the future direction of AZIB research and development.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100804"},"PeriodicalIF":1.3,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1452398124003468/pdfft?md5=28b60b3f4222f7d147e056add27d4d73&pid=1-s2.0-S1452398124003468-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310681","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 : 2024-09-19DOI: 10.1016/j.ijoes.2024.100805
Chen Li , Yujuan Zhang
The urea oxidation reaction (UOR) has potential application in water electrolysis-assisted hydrogen generation, fuel cells, and the treatment of urea-containing wastewater. In this work, the composite (Cr-NiO/CWF) was synthesized by anchoring Cr and NiO onto carbonized wood fiber (CWF) by hydrothermal method combined with pyrolysis, utilizing biomass wood fiber (WF) as the precursor for the carbon substrate. The optimal Cr-NiO/CWF has significant UOR activity, and the current density (j) can reach 310.40 mA cm−2 at 1.67 V, while the required potential for UOR is 1.36 V at the j value of 10 mA cm−2. After 12 h of long-term chronoamperometry (CA) testing, the j retention rate of Cr-NiO/CWF is 90 %. The excellent properties of Cr-NiO/CWF composites are mainly ascribed to the effective modulation of the electronic structure by Cr doping, which optimizes the adsorption behavior of the reactants and products. Cr-NiO nanoparticles enhance the carrier mobility and accelerate the electron transfer rate between Cr-NiO and carbon substrate. Moreover, Cr-NiO nanoparticles are tightly anchored onto the nitrogen-doped carbon substrate to enhance the stability of the composite.
尿素氧化反应（UOR）有望应用于水电解辅助制氢、燃料电池和含尿素废水的处理。本研究以生物质木纤维（WF）为碳基质前驱体，通过水热法结合热解将铬和氧化镍锚定在碳化木纤维（CWF）上，合成了复合材料（Cr-NiO/CWF）。最佳的 Cr-NiO/CWF 具有显著的铀氧化还原活性，在 1.67 V 的电压下，电流密度（j）可达到 310.40 mA cm-2，而在 j 值为 10 mA cm-2 时，铀氧化还原所需的电位为 1.36 V。经过 12 小时的长期精密计时器（CA）测试，Cr-NiO/CWF 的 j 值保持率为 90%。Cr-NiO/CWF 复合材料的优异性能主要归功于掺杂铬对电子结构的有效调节，从而优化了反应物和产物的吸附行为。Cr-NiO 纳米粒子增强了载流子迁移率，加快了 Cr-NiO 与碳基底之间的电子转移速度。此外，Cr-NiO 纳米粒子被紧密地固定在掺氮的碳基底上，从而提高了复合材料的稳定性。
{"title":"Cr-doped NiO nanocrystals anchored on wood-based carbon for enhanced electrocatalytic oxidation of urea","authors":"Chen Li , Yujuan Zhang","doi":"10.1016/j.ijoes.2024.100805","DOIUrl":"10.1016/j.ijoes.2024.100805","url":null,"abstract":"<div><p>The urea oxidation reaction (UOR) has potential application in water electrolysis-assisted hydrogen generation, fuel cells, and the treatment of urea-containing wastewater. In this work, the composite (Cr-NiO/CWF) was synthesized by anchoring Cr and NiO onto carbonized wood fiber (CWF) by hydrothermal method combined with pyrolysis, utilizing biomass wood fiber (WF) as the precursor for the carbon substrate. The optimal Cr-NiO/CWF has significant UOR activity, and the current density (j) can reach 310.40 mA cm<sup>−2</sup> at 1.67 V, while the required potential for UOR is 1.36 V at the j value of 10 mA cm<sup>−2</sup>. After 12 h of long-term chronoamperometry (CA) testing, the j retention rate of Cr-NiO/CWF is 90 %. The excellent properties of Cr-NiO/CWF composites are mainly ascribed to the effective modulation of the electronic structure by Cr doping, which optimizes the adsorption behavior of the reactants and products. Cr-NiO nanoparticles enhance the carrier mobility and accelerate the electron transfer rate between Cr-NiO and carbon substrate. Moreover, Cr-NiO nanoparticles are tightly anchored onto the nitrogen-doped carbon substrate to enhance the stability of the composite.</p></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100805"},"PeriodicalIF":1.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S145239812400347X/pdfft?md5=3ce343f8d16b6686b2fbb81fd4693276&pid=1-s2.0-S145239812400347X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270613","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 : 2024-09-19DOI: 10.1016/j.ijoes.2024.100806
Yachao Tu , Haoxiang Lin , Mingliang Chen , Zhonggang Zhang , Weiqiang Cai , Zhaoyi Zhu
Hydrogen produced from renewable sources is crucial for reducing carbon emissions and mitigating the impact of greenhouse gases. Solid Oxide Electrolysis Cells (SOECs) offer high efficiency in this regard, making them a focus of significant research interest. This study introduces a novel approach using numerical simulations to design a Y-shaped flow channel interconnector for the first time. A three-dimensional multiphysics coupling mathematical model is developed to investigate hydrogen production via water electrolysis in SOECs. Comparative analysis between the new Y-shaped flow channel and traditional straight channel SOEC models covers component distribution, temperature field, electrolyte current density, and thermal stress. Simulation results indicate a 20.72 % increase in hydrolysis rate with the Y-shaped channel under a counter-flow arrangement compared to the conventional straight channel. The rhombic connectors in the Y-shaped design lead to a more uniform current density distribution, with a maximum current density higher by approximately 647 A/m2 than the straight channel. However, the Y-shaped channel exhibits higher temperatures, resulting in larger thermal stress.
利用可再生资源生产氢气对于减少碳排放和减轻温室气体的影响至关重要。固体氧化物电解池（SOEC）在这方面具有很高的效率，因此成为研究的重点。本研究首次采用数值模拟的新方法来设计 Y 型流道互联器。研究还建立了一个三维多物理场耦合数学模型，以研究 SOECs 中通过电解水制氢的情况。新的 Y 型流道与传统直流道 SOEC 模型之间的比较分析包括成分分布、温度场、电解质电流密度和热应力。模拟结果表明，在逆流布置下，Y 型流道的水解率比传统直流道提高了 20.72%。Y 型设计中的菱形连接器使电流密度分布更加均匀，最大电流密度比直槽高出约 647 A/m2 。不过，Y 型通道的温度更高，导致热应力更大。
{"title":"Design and numerical analysis of a Y-shaped flow channel for enhanced hydrogen production in solid oxide electrolysis cells","authors":"Yachao Tu , Haoxiang Lin , Mingliang Chen , Zhonggang Zhang , Weiqiang Cai , Zhaoyi Zhu","doi":"10.1016/j.ijoes.2024.100806","DOIUrl":"10.1016/j.ijoes.2024.100806","url":null,"abstract":"<div><div>Hydrogen produced from renewable sources is crucial for reducing carbon emissions and mitigating the impact of greenhouse gases. Solid Oxide Electrolysis Cells (SOECs) offer high efficiency in this regard, making them a focus of significant research interest. This study introduces a novel approach using numerical simulations to design a Y-shaped flow channel interconnector for the first time. A three-dimensional multiphysics coupling mathematical model is developed to investigate hydrogen production via water electrolysis in SOECs. Comparative analysis between the new Y-shaped flow channel and traditional straight channel SOEC models covers component distribution, temperature field, electrolyte current density, and thermal stress. Simulation results indicate a 20.72 % increase in hydrolysis rate with the Y-shaped channel under a counter-flow arrangement compared to the conventional straight channel. The rhombic connectors in the Y-shaped design lead to a more uniform current density distribution, with a maximum current density higher by approximately 647 A/m<sup>2</sup> than the straight channel. However, the Y-shaped channel exhibits higher temperatures, resulting in larger thermal stress.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100806"},"PeriodicalIF":1.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323022","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 : 2024-09-18DOI: 10.1016/j.ijoes.2024.100803
Minggang Zheng , Han Liang , Wenxie Bu , Cheng Qu , Xiaoxu Hu , Zhihu Zhang
The gas diffusion layer (GDL) is a crucial component in proton exchange membrane fuel cells (PEMFCs), significantly affecting mass transport and overall cell performance. Due to the pronounced pressure gradients and uneven mass transfer between the inlet and outlet of the serpentine flow field, this study proposes the design of a GDL with a concentration gradient to optimize performance. Leveraging topological optimization algorithms, the research focuses on enhancing the mass transport properties and improving cell efficiency. The optimization process considers the pressure distribution, oxygen concentration, and water content within the serpentine flow field as boundary conditions. By optimizing the porosity and permeability of the GDL in different regions, the study aims to enhance the GDL's mass transport capabilities. Simulation results demonstrate that initializing the porosity at 1 provides superior optimization, significantly enhancing mass transfer and overall cell performance. Although increased permeability contributes to improved mass transport, its impact is less significant compared to porosity optimization. Therefore, GDL porosity is identified as the dominant factor in enhancing cell performance, while permeability adjustments play a secondary role.
{"title":"Porosity and permeability optimization of PEMFC cathode gas diffusion layer based on topology algorithm","authors":"Minggang Zheng , Han Liang , Wenxie Bu , Cheng Qu , Xiaoxu Hu , Zhihu Zhang","doi":"10.1016/j.ijoes.2024.100803","DOIUrl":"10.1016/j.ijoes.2024.100803","url":null,"abstract":"<div><div>The gas diffusion layer (GDL) is a crucial component in proton exchange membrane fuel cells (PEMFCs), significantly affecting mass transport and overall cell performance. Due to the pronounced pressure gradients and uneven mass transfer between the inlet and outlet of the serpentine flow field, this study proposes the design of a GDL with a concentration gradient to optimize performance. Leveraging topological optimization algorithms, the research focuses on enhancing the mass transport properties and improving cell efficiency. The optimization process considers the pressure distribution, oxygen concentration, and water content within the serpentine flow field as boundary conditions. By optimizing the porosity and permeability of the GDL in different regions, the study aims to enhance the GDL's mass transport capabilities. Simulation results demonstrate that initializing the porosity at 1 provides superior optimization, significantly enhancing mass transfer and overall cell performance. Although increased permeability contributes to improved mass transport, its impact is less significant compared to porosity optimization. Therefore, GDL porosity is identified as the dominant factor in enhancing cell performance, while permeability adjustments play a secondary role.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100803"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323020","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 : 2024-09-18DOI: 10.1016/j.ijoes.2024.100802
Xiaohua Chen, Zhanshan Wang, Shuang Yu, Guixia Li
The corrosion inhibition properties of carbon steel in 3.50 % NaCl corrosion solution were studied by using a compound rust inhibitor composed of alkanol amine and calcium nitrate. The electrochemical impedance spectrum and surface microscopic tests on steel corrosion were carried out under the condition of 3.500 % NaCl corrosion solution, and the AC impedance spectrum curve and microscopic morphology of different proportion of rust inhibitors (alkanol amines, calcium nitrite) on steel corrosion in concrete were obtained. The influence of composite rust inhibitors on steel corrosion process was analyzed. The results show that the composite rust inhibitor composed of 0.50 % alcoholamine and 0.50 % calcium nitrite can prolong the time of steel corrosion and decrease the corrosion rate, in the same environment, the corrosion rate of the steel bar is only 1.27 mm year−1, and the corrosion inhibition efficiency (η) is 97.8 %. Comparing the microstructure of each group, it was found that the passivation film on the surface of the steel bar with the composite rust inhibitor was dense, and no rust spots were found, which protected the steel bar well and achieved the effect of rust inhibition.
{"title":"Corrosion inhibition of carbon steel in NaCl solution Using a mixture of alkanol amine and calcium nitrite: Electrochemical and microscopic evaluation","authors":"Xiaohua Chen, Zhanshan Wang, Shuang Yu, Guixia Li","doi":"10.1016/j.ijoes.2024.100802","DOIUrl":"10.1016/j.ijoes.2024.100802","url":null,"abstract":"<div><div>The corrosion inhibition properties of carbon steel in 3.50 % NaCl corrosion solution were studied by using a compound rust inhibitor composed of alkanol amine and calcium nitrate. The electrochemical impedance spectrum and surface microscopic tests on steel corrosion were carried out under the condition of 3.500 % NaCl corrosion solution, and the AC impedance spectrum curve and microscopic morphology of different proportion of rust inhibitors (alkanol amines, calcium nitrite) on steel corrosion in concrete were obtained. The influence of composite rust inhibitors on steel corrosion process was analyzed. The results show that the composite rust inhibitor composed of 0.50 % alcoholamine and 0.50 % calcium nitrite can prolong the time of steel corrosion and decrease the corrosion rate, in the same environment, the corrosion rate of the steel bar is only 1.27 mm year<sup>−1</sup>, and the corrosion inhibition efficiency (η) is 97.8 %. Comparing the microstructure of each group, it was found that the passivation film on the surface of the steel bar with the composite rust inhibitor was dense, and no rust spots were found, which protected the steel bar well and achieved the effect of rust inhibition.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100802"},"PeriodicalIF":1.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142424393","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 : 2024-09-17DOI: 10.1016/j.ijoes.2024.100795
Moussa Ouakki , Zakia Aribou , Fatima El Hajri , Elhachmia Ech-chihbi , Zakaria Benzekri , Redouane Lachhab , Bousalham Srhir , Martin Patrick , Rafa Almeer , Mouhsine Galai , Said Boukhris , Mohammed Cherkaoui
Two new quinazoline derivatives were investigated in this research, namely 12-(4-methoxyphenyl) and 3,3-dimethyl-12-(4-nitrophenyl)-3,4,5,12-tetrahydrobenzo[4,5]imidazo[2, 1-b]quinazolin-1(2 H)-one (Q-NO2). In 1 M hydrochloric acid (HCl), −3,3-dimethyl-3,4,5,12-tetrahydrobenzo[4,5]imidazo[2,1-b]quinazolin-1(2 H)-one (Q-OMe) proved to be an extremely effective corrosion inhibitor for mild steel. The maximum inhibition efficiencies of 94.7 % for Q-NO2 and 96.7 % for Q-OMe were achieved when the performance of the inhibitors was evaluated using potentiodynamic polarization (PDP), electrochemical frequency modulation (EFM) and electrochemical impedance spectroscopy (EIS). According to these findings, the Q-NO2 and Q-OMe molecules have a remarkable ability to generate a dense, resistant protective film on the mild steel surface. This protective film acted as a barrier, effectively blocking the penetration of corrosive ions and their interaction with the mild steel substrate. The adsorption characteristics of these inhibitors on the mild steel surface conform to the Langmuir adsorption isotherm. PDP experiments show that Q-NO2 and Q-OMe act as mixed-type inhibitors for mild steel in 1.0 M HCl. Surface characterization by energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) determined that a protective layer had formed on the steel surface, preventing corrosion. The experimental results were corroborated by theoretical insights from density functional theory (DFT), which further clarified the molecular adsorption processes. This work highlights the potential of Q-NO2 and Q-OMe as effective inhibitors to protect mild steel in acidic situation.
{"title":"A study on the corrosion inhibition impact of newly synthesized quinazoline derivatives on mild steel in 1.0 M HCl: Experimental, surface morphological (SEM-EDS and FTIR) and computational analysis","authors":"Moussa Ouakki , Zakia Aribou , Fatima El Hajri , Elhachmia Ech-chihbi , Zakaria Benzekri , Redouane Lachhab , Bousalham Srhir , Martin Patrick , Rafa Almeer , Mouhsine Galai , Said Boukhris , Mohammed Cherkaoui","doi":"10.1016/j.ijoes.2024.100795","DOIUrl":"10.1016/j.ijoes.2024.100795","url":null,"abstract":"<div><div>Two new quinazoline derivatives were investigated in this research, namely 12-(4-methoxyphenyl) and 3,3-dimethyl-12-(4-nitrophenyl)-3,4,5,12-tetrahydrobenzo[4,5]imidazo[2, 1-<em>b</em>]quinazolin-1(2 H)-one (<strong>Q-NO</strong><sub><strong>2</strong></sub>). In 1 M hydrochloric acid (HCl), −3,3-dimethyl-3,4,5,12-tetrahydrobenzo[4,5]imidazo[2,1-<em>b</em>]quinazolin-1(2 H)-one (<strong>Q-OMe</strong>) proved to be an extremely effective corrosion inhibitor for mild steel. The maximum inhibition efficiencies of 94.7 % for <strong>Q-NO</strong><sub><strong>2</strong></sub> and 96.7 % for <strong>Q-OMe</strong> were achieved when the performance of the inhibitors was evaluated using potentiodynamic polarization (PDP), electrochemical frequency modulation (EFM) and electrochemical impedance spectroscopy (EIS). According to these findings, the <strong>Q-NO</strong><sub><strong>2</strong></sub> and <strong>Q-OMe</strong> molecules have a remarkable ability to generate a dense, resistant protective film on the mild steel surface. This protective film acted as a barrier, effectively blocking the penetration of corrosive ions and their interaction with the mild steel substrate. The adsorption characteristics of these inhibitors on the mild steel surface conform to the Langmuir adsorption isotherm. PDP experiments show that <strong>Q-NO</strong><sub><strong>2</strong></sub> and <strong>Q-OMe</strong> act as mixed-type inhibitors for mild steel in 1.0 M HCl. Surface characterization by energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) determined that a protective layer had formed on the steel surface, preventing corrosion. The experimental results were corroborated by theoretical insights from density functional theory (DFT), which further clarified the molecular adsorption processes. This work highlights the potential of <strong>Q-NO</strong><sub><strong>2</strong></sub> and <strong>Q-OMe</strong> as effective inhibitors to protect mild steel in acidic situation.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100795"},"PeriodicalIF":1.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323021","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 : 2024-09-17DOI: 10.1016/j.ijoes.2024.100801
Xiaolong Li , Yanfeng Liu , Heng Zuo , Yuehong Song , Fengying Chen
In this work, the effects of Zn2+ on the electrochemical activity of positive electrolyte were researched by cyclic voltammetry(CV), AC impedance. The results of CV showed that the positive electrolyte containing 2 wt% Zn2+ as additive had the best electrochemical activity. Compared with the electrolyte without any additive, the electrolyte with 2 wt% Zn2+ obviously enhanced electrochemical activity and reversibility of Farady reaction. In addition, the kinetic study of the mass transfer process indicated that the diffusion coefficient obviously increased. Besides, the results of electrochemical impedance spectroscopy implied that the internal charge transfer resistance of the electrolyte electrochemical system containing Zn2+ as an additive was significantly reduced. This indicated that the charge transfer was significantly accelerated, which was beneficial to the improvement of the electrochemical activity. Moreover, the study of the electrolyte stability showed that the electrolyte containing Zn2+ had superior stability yet after 30 cycles’ scanning.
{"title":"The effect of Zn2+ on the positive electrolyte for all-vanadium redox flow battery","authors":"Xiaolong Li , Yanfeng Liu , Heng Zuo , Yuehong Song , Fengying Chen","doi":"10.1016/j.ijoes.2024.100801","DOIUrl":"10.1016/j.ijoes.2024.100801","url":null,"abstract":"<div><p>In this work, the effects of Zn<sup>2+</sup> on the electrochemical activity of positive electrolyte were researched by cyclic voltammetry(CV), AC impedance. The results of CV showed that the positive electrolyte containing 2 wt% Zn<sup>2+</sup> as additive had the best electrochemical activity. Compared with the electrolyte without any additive, the electrolyte with 2 wt% Zn<sup>2+</sup> obviously enhanced electrochemical activity and reversibility of Farady reaction. In addition, the kinetic study of the mass transfer process indicated that the diffusion coefficient obviously increased. Besides, the results of electrochemical impedance spectroscopy implied that the internal charge transfer resistance of the electrolyte electrochemical system containing Zn<sup>2+</sup> as an additive was significantly reduced. This indicated that the charge transfer was significantly accelerated, which was beneficial to the improvement of the electrochemical activity. Moreover, the study of the electrolyte stability showed that the electrolyte containing Zn<sup>2+</sup> had superior stability yet after 30 cycles’ scanning.</p></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 10","pages":"Article 100801"},"PeriodicalIF":1.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1452398124003432/pdfft?md5=088d194760c54b6a8625f23f7c8237fd&pid=1-s2.0-S1452398124003432-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238674","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 : 2024-09-17DOI: 10.1016/j.ijoes.2024.100799
Song Wan , Lin Tang
This study investigates the rancidity development in four edible oils (corn, mustard, soybean, and sunflower) over a 12-month storage period using a novel approach combining electrochemical techniques and machine learning. Cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry were employed to characterize oil oxidation. Electrochemical parameters showed strong correlations with traditional chemical indicators, such as the DPV peak current at +0.2 V with p-anisidine value (r = 0.94, p < 0.001). A Random Forest model, trained on electrochemical data, accurately predicted Total Oxidation (TOTOX) values, achieving an R² of 0.96 and RMSE of 2.18 for the test set. The model effectively captured oxidation trends across oil types, with the highest accuracy for mustard oil (MAE: 1.21) and lower performance for sunflower oil (MAE: 2.15). Feature importance analysis revealed charge transfer resistance and DPV peak currents as the most influential predictors. This approach offers rapid, non-destructive assessment of oil quality, potentially improving quality control in the food industry. However, challenges such as electrode fouling and complex sample preparation need to be addressed for practical implementation.
{"title":"Comprehensive electrochemical and machine learning-based study of rancidity in four edible oils over various storage periods","authors":"Song Wan , Lin Tang","doi":"10.1016/j.ijoes.2024.100799","DOIUrl":"10.1016/j.ijoes.2024.100799","url":null,"abstract":"<div><p>This study investigates the rancidity development in four edible oils (corn, mustard, soybean, and sunflower) over a 12-month storage period using a novel approach combining electrochemical techniques and machine learning. Cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry were employed to characterize oil oxidation. Electrochemical parameters showed strong correlations with traditional chemical indicators, such as the DPV peak current at +0.2 V with p-anisidine value (r = 0.94, p < 0.001). A Random Forest model, trained on electrochemical data, accurately predicted Total Oxidation (TOTOX) values, achieving an R² of 0.96 and RMSE of 2.18 for the test set. The model effectively captured oxidation trends across oil types, with the highest accuracy for mustard oil (MAE: 1.21) and lower performance for sunflower oil (MAE: 2.15). Feature importance analysis revealed charge transfer resistance and DPV peak currents as the most influential predictors. This approach offers rapid, non-destructive assessment of oil quality, potentially improving quality control in the food industry. However, challenges such as electrode fouling and complex sample preparation need to be addressed for practical implementation.</p></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 11","pages":"Article 100799"},"PeriodicalIF":1.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1452398124003419/pdfft?md5=0f08bb25c65699c6f2ee0d6a7c61e071&pid=1-s2.0-S1452398124003419-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142270611","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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