Pub Date : 2024-11-16DOI: 10.1016/j.ijoes.2024.100880
Inhan Kang, Jungwon Kang
This study prepared Co3O4/Super P/Multi-walled carbon nanotube (MWCNT) free-standing films through a simple vacuum filtration method. The free-standing films showed that Co3O4 particles were well dispersed within the Super P and MWCNT network backbone without deforming oxide materials, confirmed by scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns. Employing Co3O4/Super P/MWCNT free-standing films as an anode electrode in lithium-ion batteries is superior to conventional electrode procedures because a binder is not required, and the current collector and laminate process are required. Moreover, the Co3O4/Super P/MWCNT electrodes showed remarkable capacity and rate capability compared to that of conventional laminated Co3O4/carbon composites. The enhanced electrochemical performance of Co3O4/Super P/MWCNT electrodes could be attributed to the extraordinary electrical conduction of MWCNT in nature and its stable connection between the conductive substrate and active materials. Furthermore, this connection offers the integrity of the electrode despite volume variation during Lithium (Li)-ion intercalation and deintercalation.
本研究通过简单的真空过滤方法制备了 Co3O4/Super P/多壁碳纳米管（MWCNT）独立薄膜。经扫描电子显微镜（SEM）图像和 X 射线衍射（XRD）图证实，独立薄膜显示 Co3O4 颗粒很好地分散在 Super P 和 MWCNT 网络骨架中，氧化物材料没有变形。在锂离子电池中使用 Co3O4/Super P/MWCNT 独立薄膜作为阳极电极优于传统电极工艺，因为不需要粘合剂，也不需要集流器和层压工艺。此外，与传统的层压 Co3O4/碳复合材料相比，Co3O4/Super P/MWCNT 电极显示出显著的容量和速率能力。Co3O4/Super P/MWCNT 电极电化学性能的增强可归因于自然界中 MWCNT 的超强导电性及其在导电基底和活性材料之间的稳定连接。此外，尽管在锂（Li）离子插层和脱插层过程中电极的体积会发生变化，但这种连接仍能保证电极的完整性。
{"title":"Facile preparation of Co3O4/Super P/multi-walled carbon nanotube films for high-performance Li-ion battery anodes","authors":"Inhan Kang, Jungwon Kang","doi":"10.1016/j.ijoes.2024.100880","DOIUrl":"10.1016/j.ijoes.2024.100880","url":null,"abstract":"<div><div>This study prepared Co<sub>3</sub>O<sub>4</sub>/Super P/Multi-walled carbon nanotube (MWCNT) free-standing films through a simple vacuum filtration method. The free-standing films showed that Co<sub>3</sub>O<sub>4</sub> particles were well dispersed within the Super P and MWCNT network backbone without deforming oxide materials, confirmed by scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns. Employing Co<sub>3</sub>O<sub>4</sub>/Super P/MWCNT free-standing films as an anode electrode in lithium-ion batteries is superior to conventional electrode procedures because a binder is not required, and the current collector and laminate process are required. Moreover, the Co<sub>3</sub>O<sub>4</sub>/Super P/MWCNT electrodes showed remarkable capacity and rate capability compared to that of conventional laminated Co<sub>3</sub>O<sub>4</sub>/carbon composites. The enhanced electrochemical performance of Co<sub>3</sub>O<sub>4</sub>/Super P/MWCNT electrodes could be attributed to the extraordinary electrical conduction of MWCNT in nature and its stable connection between the conductive substrate and active materials. Furthermore, this connection offers the integrity of the electrode despite volume variation during Lithium (Li)-ion intercalation and deintercalation.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100880"},"PeriodicalIF":1.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704276","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}
The present study reveals the micellization nature of cetyltrimethylammonium bromide (CTAB) in aqueous solutions of sodium alginate (SA) with short-chain alcohols (containing 1–3 carbon number) and glycerol using the conductometric method at temperatures from 305.55 to 325.55 K with 5 K interval. The aggregation property has been characterized by assessing critical micelle concentration (CMC) from conductivity (κ) versus surfactant concentration plots. The micellar variables such as CMC and the extent of counterion binding (β) demonstrate the dependency on the variation in solvent categories, composition of the solvent mixture, and working temperatures. For the CTAB + SA (0.01 %, w/w) mixed system at 310.55 K, the increased CMC values were acquired with increasing quantity of alcohols and glycerol introduced. The CMC values showed a rising trend with the escalation of working temperature. The negative Gibbs free energy values were attained for the CTAB + SA system in all investigating solvents, which stated the spontaneous occurrence of aggregation of the employed system. In aqueous alcohols media, the enthalpy changes () were attained as positive and negative at lower and elevated investigated temperatures respectively; while in aqueous glycerol environment, the values were acquired to be all negative at inspected temperatures. The entropy changes () were realized to be positive for the investigated cases. The compensation temperature (Tc) values have been achieved to be in the series of 241.91 K to 318.75 K which showed a good analogy to the literature stated data for the micellization of amphiphiles. The attained knowledge from the present investigation might help in improving the formulations in industries including pharmaceuticals, foods, and cosmetics.
本研究采用电导法，在 305.55 至 325.55 K 温度范围内，以 5 K 为间隔，揭示了十六烷基三甲基溴化铵（CTAB）在海藻酸钠（SA）与短链醇（含 1-3 个碳原子数）和甘油的水溶液中的胶束化性质。根据电导率 (κ)与表面活性剂浓度的关系图评估临界胶束浓度 (CMC)，从而确定聚集特性。CMC 和反离子结合程度 (β)等胶束变量表明，它们与溶剂类别、混合溶剂成分和工作温度的变化有关。对于在 310.55 K 下的 CTAB + SA（0.01%，w/w）混合体系，随着引入的醇和甘油数量的增加，CMC 值也随之增加。随着工作温度的升高，CMC 值呈上升趋势。在所有研究溶剂中，CTAB + SA 体系的吉布斯自由能（ΔGm0）均为负值，这表明所使用的体系会自发发生聚集。在醇类水介质中，焓变化（ΔHmo）在较低和较高的研究温度下分别为正值和负值；而在甘油水环境中，ΔHmo 值在检测温度下均为负值。在调查的情况下，熵变化（∆Smo）均为正值。补偿温度 (Tc) 值介于 241.91 K 至 318.75 K 之间，与两性化合物胶束化的文献数据非常相似。本研究获得的知识可能有助于改进制药、食品和化妆品等行业的配方。
{"title":"Assessment of cationic amphiphile-biopolymer interactions: Effects of organic compounds and temperature on association phenomena","authors":"Maria Akhtar , Javed Masood Khan , Manoj Kumar Banjare , Sharmin Akhter Maya , Md. Rafikul Islam , Shahed Rana , Md. Anamul Hoque , Mahbub Kabir","doi":"10.1016/j.ijoes.2024.100879","DOIUrl":"10.1016/j.ijoes.2024.100879","url":null,"abstract":"<div><div>The present study reveals the micellization nature of cetyltrimethylammonium bromide (CTAB) in aqueous solutions of sodium alginate (SA) with short-chain alcohols (containing 1–3 carbon number) and glycerol using the conductometric method at temperatures from 305.55 to 325.55 K with 5 K interval. The aggregation property has been characterized by assessing critical micelle concentration (CMC) from conductivity (<em>κ</em>) versus surfactant concentration plots. The micellar variables such as CMC and the extent of counterion binding (<em>β</em>) demonstrate the dependency on the variation in solvent categories, composition of the solvent mixture, and working temperatures. For the CTAB + SA (0.01 %, w/w) mixed system at 310.55 K, the increased CMC values were acquired with increasing quantity of alcohols and glycerol introduced. The CMC values showed a rising trend with the escalation of working temperature. The negative Gibbs free energy <span><math><mrow><msubsup><mrow><mo>(</mo><mi>Δ</mi><mi>G</mi></mrow><mrow><mi>m</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>)</mo></mrow></math></span> values were attained for the CTAB + SA system in all investigating solvents, which stated the spontaneous occurrence of aggregation of the employed system. In aqueous alcohols media, the enthalpy changes (<span><math><msubsup><mrow><mo>∆</mo><mi>H</mi></mrow><mrow><mi>m</mi></mrow><mrow><mi>o</mi></mrow></msubsup></math></span>) were attained as positive and negative at lower and elevated investigated temperatures respectively; while in aqueous glycerol environment, the <span><math><msubsup><mrow><mo>∆</mo><mi>H</mi></mrow><mrow><mi>m</mi></mrow><mrow><mi>o</mi></mrow></msubsup></math></span> values were acquired to be all negative at inspected temperatures. The entropy changes (<span><math><msubsup><mrow><mo>∆</mo><mi>S</mi></mrow><mrow><mi>m</mi></mrow><mrow><mi>o</mi></mrow></msubsup></math></span>) were realized to be positive for the investigated cases. The compensation temperature (<em>T</em><sub>c</sub>) values have been achieved to be in the series of 241.91 K to 318.75 K which showed a good analogy to the literature stated data for the micellization of amphiphiles. The attained knowledge from the present investigation might help in improving the formulations in industries including pharmaceuticals, foods, and cosmetics.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100879"},"PeriodicalIF":1.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704300","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 : 2024-11-13DOI: 10.1016/j.ijoes.2024.100877
Cheng Chang , Ruijie Wang
Large-scale lithium-ion batteries play an important role in the electric vehicle market and the thermal runaway (TR) behaviour of batteries is one of the significant threats to the passengers. In this study, we conducted a series of thermal abuse tests concerning single battery and battery box to investigate the TR behaviour of a large-capacity (310 Ah) lithium iron phosphate (LiFePO4) battery and the TR inhibition effects of different extinguishing agents. The study shows that before the decomposition of the solid electrolyte interphase (SEI) film, temperature consistency within the battery were maintained and it was advisable to use temperature detectors. With the destruction of the internal structure of the battery and the uneven temperature distribution at the subsequent battery reaction stage, a large amount of combustible gas was released when the safety valve was opened. The combustible gas fire detector is used to improve alarm reliability and provided a stable early warning response time. Based on this TR behaviour, a LiFePO4 battery box with a standard size of 1060 × 660 × 250 mm was constructed. The TR inhibition effect of two different extinguishing agents (heptafluoropropane and perfluorohexanone) were investigated using a metal tube spraying method with a spraying dose of 1.8 kg (spraying rate of 0.06 kg/s) and a spraying pressure of 2.5 MPa. The results showed that using either of these, satisfy the requirements for TR inhibition in large-capacity LiFePO4 batteries and the flames could be completely extinguished without any reignition, and the chain reaction of the surrounding batteries was effectively prevented. Moreover, heptafluoropropane was proven to have a shorter fire-extinguishing time, whereas perfluorohexanone had the advantage of inhibiting temperature rise. This study provides valuable experimental results for early warning and inhibition of TR in large-capacity LiFePO4 batteries for electric vehicles.
{"title":"Experimental investigation of thermal runaway behaviour and inhibition strategies in large-capacity lithium iron phosphate (LiFePO4) batteries for electric vehicles","authors":"Cheng Chang , Ruijie Wang","doi":"10.1016/j.ijoes.2024.100877","DOIUrl":"10.1016/j.ijoes.2024.100877","url":null,"abstract":"<div><div>Large-scale lithium-ion batteries play an important role in the electric vehicle market and the thermal runaway (TR) behaviour of batteries is one of the significant threats to the passengers. In this study, we conducted a series of thermal abuse tests concerning single battery and battery box to investigate the TR behaviour of a large-capacity (310 Ah) lithium iron phosphate (LiFePO<sub>4</sub>) battery and the TR inhibition effects of different extinguishing agents. The study shows that before the decomposition of the solid electrolyte interphase (SEI) film, temperature consistency within the battery were maintained and it was advisable to use temperature detectors. With the destruction of the internal structure of the battery and the uneven temperature distribution at the subsequent battery reaction stage, a large amount of combustible gas was released when the safety valve was opened. The combustible gas fire detector is used to improve alarm reliability and provided a stable early warning response time. Based on this TR behaviour, a LiFePO<sub>4</sub> battery box with a standard size of 1060 × 660 × 250 mm was constructed. The TR inhibition effect of two different extinguishing agents (heptafluoropropane and perfluorohexanone) were investigated using a metal tube spraying method with a spraying dose of 1.8 kg (spraying rate of 0.06 kg/s) and a spraying pressure of 2.5 MPa. The results showed that using either of these, satisfy the requirements for TR inhibition in large-capacity LiFePO<sub>4</sub> batteries and the flames could be completely extinguished without any reignition, and the chain reaction of the surrounding batteries was effectively prevented. Moreover, heptafluoropropane was proven to have a shorter fire-extinguishing time, whereas perfluorohexanone had the advantage of inhibiting temperature rise. This study provides valuable experimental results for early warning and inhibition of TR in large-capacity LiFePO<sub>4</sub> batteries for electric vehicles.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100877"},"PeriodicalIF":1.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704277","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 : 2024-11-13DOI: 10.1016/j.ijoes.2024.100875
Sun Li , Zhang Xianzhen , Jia Qihua , Zhang Zhongming , Zhang Huabo
NiW/TiO2 composite coatings were electrodeposited on the surface of Q235B steel to investigate the effect of different TiO2 particle concentrations on the deposition rate, thickness, chemical composition, and surface morphology of the composite coatings. The corrosion resistance of the NiW/TiO2 composite coatings and their photocatalytic degradation of methylene blue in simulated wastewater were examined and verified. The NiW/TiO2 composite coating electrodeposited from a plating solution with 15 g/L TiO2 particle exhibited the fastest deposition rate (402 mg/h) and the largest thickness (23.92 μm). All electrodeposited NiW/TiO2 composite coatings comprised C, Ti, Ni and W, with granular surface morphology. Increasing the TiO2 particle concentration in the plating solution enhanced the mass transfer rate of Ni ions, thereby increasing the Ni and Ti contents in the composite coating. However, at an excessive TiO2 particle concentration of 20 g/L, the viscosity increased and the transfer rate of particles and nickel ions decreased, resulting in a decrease in the Ni and Ti contents in the composite coating. Among all NiW/TiO2 composite coatings, the NiW/TiO2 composite coating electrodeposited from a plating bath containing 15 g/L TiO2 particle demonstrated optimal corrosion resistance with the most positive corrosion potential (-0.533 V) and the lowest corrosion current density (8.6×10−6 A/cm2). The electrodeposited NiW/TiO2 composite coatings effectively degraded the methylene blue in the simulated wastewater, achieving an optimal degradation efficiency of 60.7 %.
在 Q235B 钢表面电沉积了 NiW/TiO2 复合涂层，研究了不同浓度的 TiO2 粒子对复合涂层的沉积速率、厚度、化学成分和表面形貌的影响。研究并验证了 NiW/TiO2 复合涂层的耐腐蚀性及其在模拟废水中对亚甲基蓝的光催化降解能力。从含有 15 g/L TiO2 粒子的电镀液中电解沉积的 NiW/TiO2 复合镀层的沉积速率最快（402 mg/h），厚度最大（23.92 μm）。所有电沉积的 NiW/TiO2 复合镀层都由 C、Ti、Ni 和 W 组成，表面形态呈颗粒状。提高镀液中 TiO2 粒子的浓度可提高 Ni 离子的传质速率，从而增加复合镀层中 Ni 和 Ti 的含量。然而，当 TiO2 颗粒浓度过高（20 g/L）时，粘度增加，颗粒和镍离子的转移率降低，导致复合镀层中的 Ni 和 Ti 含量下降。在所有 NiW/TiO2 复合镀层中，从含 15 g/L TiO2 粒子的电镀液中电解沉积的 NiW/TiO2 复合镀层具有最佳的耐腐蚀性，腐蚀电位最正（-0.533 V），腐蚀电流密度最低（8.6×10-6 A/cm2）。电沉积的 NiW/TiO2 复合涂层能有效降解模拟废水中的亚甲基蓝，最佳降解效率为 60.7%。
{"title":"Study on the corrosion resistance of electrodeposited NiW/TiO2 composite coating and its application in methylene blue degradation in simulated wastewater","authors":"Sun Li , Zhang Xianzhen , Jia Qihua , Zhang Zhongming , Zhang Huabo","doi":"10.1016/j.ijoes.2024.100875","DOIUrl":"10.1016/j.ijoes.2024.100875","url":null,"abstract":"<div><div>NiW/TiO<sub>2</sub> composite coatings were electrodeposited on the surface of Q235B steel to investigate the effect of different TiO<sub>2</sub> particle concentrations on the deposition rate, thickness, chemical composition, and surface morphology of the composite coatings. The corrosion resistance of the NiW/TiO<sub>2</sub> composite coatings and their photocatalytic degradation of methylene blue in simulated wastewater were examined and verified. The NiW/TiO<sub>2</sub> composite coating electrodeposited from a plating solution with 15 g/L TiO<sub>2</sub> particle exhibited the fastest deposition rate (402 mg/h) and the largest thickness (23.92 μm). All electrodeposited NiW/TiO<sub>2</sub> composite coatings comprised C, Ti, Ni and W, with granular surface morphology. Increasing the TiO<sub>2</sub> particle concentration in the plating solution enhanced the mass transfer rate of Ni ions, thereby increasing the Ni and Ti contents in the composite coating. However, at an excessive TiO<sub>2</sub> particle concentration of 20 g/L, the viscosity increased and the transfer rate of particles and nickel ions decreased, resulting in a decrease in the Ni and Ti contents in the composite coating. Among all NiW/TiO<sub>2</sub> composite coatings, the NiW/TiO<sub>2</sub> composite coating electrodeposited from a plating bath containing 15 g/L TiO<sub>2</sub> particle demonstrated optimal corrosion resistance with the most positive corrosion potential (-0.533 V) and the lowest corrosion current density (8.6×10<sup>−6</sup> A/cm<sup>2</sup>). The electrodeposited NiW/TiO<sub>2</sub> composite coatings effectively degraded the methylene blue in the simulated wastewater, achieving an optimal degradation efficiency of 60.7 %.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100875"},"PeriodicalIF":1.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651404","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 : 2024-11-13DOI: 10.1016/j.ijoes.2024.100878
Yuqiong Liu , Ruirui Yang , Mengjia Zhao , Haochang Guo , Yuqi Liu , Haiyan Yan , Zhenguo Liu
This study reports the development of a sensitive electrochemical sensor for paracetamol detection based on a layer-by-layer self-assembled poly(diallyl dimethylammonium chloride)/β-cyclodextrin (PDDA/β-CD) composite film. The optimized 5-bilayer PDDA/β-CD modified glassy carbon electrode exhibited enhanced electron transfer kinetics and analyte preconcentration. Scanning electron microscopy revealed a porous, three-dimensional network structure, while X-ray photoelectron spectroscopy confirmed the successful incorporation of both PDDA and β-CD components. Electrochemical impedance spectroscopy showed a minimum charge transfer resistance of 119 Ω for the 1-bilayer modified electrode. The sensor showed two distinct linear response intervals (0.01–50 μM and 50–500 μM) and was able to detect concentrations as low as 0.03 μM. The investigation into pH dependence suggested that paracetamol oxidation follows a two-electron, two-proton mechanism, with the best results observed at pH 7.0. The modified electrode showed excellent selectivity, maintaining its response in the presence of common interferents at 10-fold excess concentrations. The sensor showed consistent results (relative standard deviation (RSD) = 3.2 %, n = 5) and remained stable over time, maintaining 92 % of its original performance after a month. Practical applicability was demonstrated through accurate paracetamol determination in pharmaceutical formulations (recoveries 98.6–101.2 %) and spiked urine samples (recoveries 97.8–102.5 %). The proposed PDDA/β-CD composite sensor offers a simple, cost-effective, and environmentally friendly platform for paracetamol analysis in pharmaceutical and practical applications.
{"title":"Layer-by-layer self-assembled poly(diallyldimethylammonium chloride)/cyclodextrin composite materials for the electrochemical detection of paracetamol","authors":"Yuqiong Liu , Ruirui Yang , Mengjia Zhao , Haochang Guo , Yuqi Liu , Haiyan Yan , Zhenguo Liu","doi":"10.1016/j.ijoes.2024.100878","DOIUrl":"10.1016/j.ijoes.2024.100878","url":null,"abstract":"<div><div>This study reports the development of a sensitive electrochemical sensor for paracetamol detection based on a layer-by-layer self-assembled poly(diallyl dimethylammonium chloride)/β-cyclodextrin (PDDA/β-CD) composite film. The optimized 5-bilayer PDDA/β-CD modified glassy carbon electrode exhibited enhanced electron transfer kinetics and analyte preconcentration. Scanning electron microscopy revealed a porous, three-dimensional network structure, while X-ray photoelectron spectroscopy confirmed the successful incorporation of both PDDA and β-CD components. Electrochemical impedance spectroscopy showed a minimum charge transfer resistance of 119 Ω for the 1-bilayer modified electrode. The sensor showed two distinct linear response intervals (0.01–50 μM and 50–500 μM) and was able to detect concentrations as low as 0.03 μM. The investigation into pH dependence suggested that paracetamol oxidation follows a two-electron, two-proton mechanism, with the best results observed at pH 7.0. The modified electrode showed excellent selectivity, maintaining its response in the presence of common interferents at 10-fold excess concentrations. The sensor showed consistent results (relative standard deviation (RSD) = 3.2 %, n = 5) and remained stable over time, maintaining 92 % of its original performance after a month. Practical applicability was demonstrated through accurate paracetamol determination in pharmaceutical formulations (recoveries 98.6–101.2 %) and spiked urine samples (recoveries 97.8–102.5 %). The proposed PDDA/β-CD composite sensor offers a simple, cost-effective, and environmentally friendly platform for paracetamol analysis in pharmaceutical and practical applications.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100878"},"PeriodicalIF":1.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704278","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}
Corrosion of mild steel, particularly in acidic environments such as hydrochloric acid (HCl), remains a critical issue due to its impact on material durability, economic costs, and safety concerns. This study introduces 14-(p-tolyl)-14H-dibenzo[a,j]xanthene (ZM5), a novel and highly effective organic corrosion inhibitor, to mitigate this challenge. Employing advanced electrochemical techniques: electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP), we evaluated ZM5’s performance in a 1 M HCl solution, revealing an impressive inhibition efficiency of 94.7 %. Surface characterization using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) further confirmed the formation of a robust protective film on the steel surface, shedding light on ZM5’s adsorption mechanisms. Complementing the experimental findings, Density Functional Theory (DFT) simulations provided theoretical insights into the anti-corrosion mechanism of ZM5, aligning well with observed results. These findings underscore ZM5's potential as a highly promising corrosion inhibitor for industrial applications, effectively enhancing the corrosion resistance of mild steel in aggressive environments.
低碳钢的腐蚀，尤其是在盐酸（HCl）等酸性环境中的腐蚀，由于其对材料耐久性、经济成本和安全问题的影响，仍然是一个关键问题。本研究引入了 14-（对甲苯基）-14H-二苯并[a,j]呫吨（ZM5）这种新型高效有机缓蚀剂，以缓解这一挑战。我们采用先进的电化学技术：电化学阻抗光谱（EIS）和电位极化（PDP），评估了 ZM5 在 1 M HCl 溶液中的性能，结果显示其抑制效率高达 94.7%，令人印象深刻。利用扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDX）进行的表面表征进一步证实了钢表面形成了一层坚固的保护膜，从而揭示了 ZM5 的吸附机制。作为对实验结果的补充，密度泛函理论（DFT）模拟从理论上揭示了 ZM5 的防腐蚀机理，并与观察结果完全吻合。这些发现凸显了 ZM5 作为一种极具工业应用前景的缓蚀剂的潜力，它能有效提高低碳钢在侵蚀性环境中的耐腐蚀性。
{"title":"Evaluation of 14-(p-tolyl)-14H-dibenzo[a,j]xanthene as a highly efficient organic corrosion inhibitor for mild steel in 1 M HCl: Electrochemical, theoretical, and surface characterization","authors":"Azzeddine Belkheiri , Khadija Dahmani , Mohamed Khattabi , Khaoula Mzioud , Otmane Kharbouch , Mouhsine Galai , Nadia Dkhireche , Zakaria Benzekri , Said Boukhris , Rafa Almeer , Basheer M. Al-Maswari , Mohamed Ebn Touhami","doi":"10.1016/j.ijoes.2024.100873","DOIUrl":"10.1016/j.ijoes.2024.100873","url":null,"abstract":"<div><div>Corrosion of mild steel, particularly in acidic environments such as hydrochloric acid (HCl), remains a critical issue due to its impact on material durability, economic costs, and safety concerns. This study introduces 14-(p-tolyl)-14H-dibenzo[<em>a</em>,<em>j</em>]xanthene (ZM5), a novel and highly effective organic corrosion inhibitor, to mitigate this challenge. Employing advanced electrochemical techniques: electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP), we evaluated ZM5’s performance in a 1 M HCl solution, revealing an impressive inhibition efficiency of 94.7 %. Surface characterization using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) further confirmed the formation of a robust protective film on the steel surface, shedding light on ZM5’s adsorption mechanisms. Complementing the experimental findings, Density Functional Theory (DFT) simulations provided theoretical insights into the anti-corrosion mechanism of ZM5, aligning well with observed results. These findings underscore ZM5's potential as a highly promising corrosion inhibitor for industrial applications, effectively enhancing the corrosion resistance of mild steel in aggressive environments.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100873"},"PeriodicalIF":1.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704299","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 : 2024-11-09DOI: 10.1016/j.ijoes.2024.100872
Junhua Liu , Ying Wu , Fengwei Yan , Yu Yan , Fei Wang , Guangchao Zhang , Ling Zeng , Yin Ma , Jiahao Guo , Yuchun Li
Prolonged exposure of Q355B steel to the marine environment renders it susceptible to corrosion from seawater salt spray. In this study, inorganic zinc-rich coatings incorporating different components of graphene and calcium carbonate as anti-corrosion strategy were designed and aimed to improving their corrosion resistance. The anti-corrosion performance of these coating on Q355B was evaluated using scanning electron microscopy (SEM), X-ray diffraction (XRD), Potentiodynamic polarization tests and electrochemical impedance spectroscopy. Results indicated that the coating of 2G-1.5CaCO3-ZRC exhibited a corrosion current density of 1.565 × 10−5A cm−2 and an impedance value of 734.6 Ω after immersion in simulated seawater solution for seven days. Compared with the untreated coating, this formulation demonstrated reduced corrosion current density and increased impedance values, indicating that the incorporation of graphene and calcium carbonate effectively mitigated corrosion rates while prolonging the materials protection duration. This work delivers the potential application in the field of protection for metal structures in seaport areas.
{"title":"Enhancing corrosion resistance of Q355B steel in marine environments using graphene doped inorganic zinc-rich coatings","authors":"Junhua Liu , Ying Wu , Fengwei Yan , Yu Yan , Fei Wang , Guangchao Zhang , Ling Zeng , Yin Ma , Jiahao Guo , Yuchun Li","doi":"10.1016/j.ijoes.2024.100872","DOIUrl":"10.1016/j.ijoes.2024.100872","url":null,"abstract":"<div><div>Prolonged exposure of Q355B steel to the marine environment renders it susceptible to corrosion from seawater salt spray. In this study, inorganic zinc-rich coatings incorporating different components of graphene and calcium carbonate as anti-corrosion strategy were designed and aimed to improving their corrosion resistance. The anti-corrosion performance of these coating on Q355B was evaluated using scanning electron microscopy (SEM), X-ray diffraction (XRD), Potentiodynamic polarization tests and electrochemical impedance spectroscopy. Results indicated that the coating of 2G-1.5CaCO<sub>3</sub>-ZRC exhibited a corrosion current density of 1.565 × 10<sup>−5</sup>A cm<sup>−2</sup> and an impedance value of 734.6 Ω after immersion in simulated seawater solution for seven days. Compared with the untreated coating, this formulation demonstrated reduced corrosion current density and increased impedance values, indicating that the incorporation of graphene and calcium carbonate effectively mitigated corrosion rates while prolonging the materials protection duration. This work delivers the potential application in the field of protection for metal structures in seaport areas.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100872"},"PeriodicalIF":1.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651402","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 : 2024-11-06DOI: 10.1016/j.ijoes.2024.100849
Ying Wang, Wei He
This study presents a novel electrochemical fingerprinting method for Buzhong Yiqi Tang extract granules using a diamond-graphene composite electrode. The electrode was fabricated through chemical vapor deposition of graphene on high-pressure high-temperature synthetic diamond, resulting in a few-layer graphene coating as confirmed by Raman spectroscopy (I₂D/IG ratio ≈ 1.2) and XPS analysis (78 % sp² C-C signal). Cyclic voltammetry revealed four anodic and three cathodic peaks, while differential pulse voltammetry provided enhanced resolution with eight distinct oxidation peaks. The method demonstrated high sensitivity (LODs 0.08–0.15 mg/mL) and good linearity (R² > 0.995) over a concentration range of 0.5–10 mg/mL. Comparison of fingerprints from individual herb extracts (Astragalus membranaceus, Panax ginseng, and Glycyrrhiza uralensis) elucidated the origins of major peaks in the Buzhong Yiqi Tang profile. Principal component analysis of fingerprints successfully differentiated between samples from three manufacturers, accounting for 87.3 % of total variance. Strong correlations (r > 0.92) were observed between key DPV peak intensities and HPLC-determined concentrations of traditional chemical markers. The rapid analysis time, minimal sample preparation, and holistic representation of multiple electroactive components make this approach a promising complement to existing chromatographic methods for quality assessment of traditional Chinese medicine formulations.
{"title":"Investigation of electrochemical fingerprints for Buzhong Yiqi Tang extract granules using diamond-graphene composite electrode","authors":"Ying Wang, Wei He","doi":"10.1016/j.ijoes.2024.100849","DOIUrl":"10.1016/j.ijoes.2024.100849","url":null,"abstract":"<div><div>This study presents a novel electrochemical fingerprinting method for Buzhong Yiqi Tang extract granules using a diamond-graphene composite electrode. The electrode was fabricated through chemical vapor deposition of graphene on high-pressure high-temperature synthetic diamond, resulting in a few-layer graphene coating as confirmed by Raman spectroscopy (I₂<sub>D</sub>/I<sub>G</sub> ratio ≈ 1.2) and XPS analysis (78 % sp² C-C signal). Cyclic voltammetry revealed four anodic and three cathodic peaks, while differential pulse voltammetry provided enhanced resolution with eight distinct oxidation peaks. The method demonstrated high sensitivity (LODs 0.08–0.15 mg/mL) and good linearity (R² > 0.995) over a concentration range of 0.5–10 mg/mL. Comparison of fingerprints from individual herb extracts (Astragalus membranaceus, Panax ginseng, and Glycyrrhiza uralensis) elucidated the origins of major peaks in the Buzhong Yiqi Tang profile. Principal component analysis of fingerprints successfully differentiated between samples from three manufacturers, accounting for 87.3 % of total variance. Strong correlations (r > 0.92) were observed between key DPV peak intensities and HPLC-determined concentrations of traditional chemical markers. The rapid analysis time, minimal sample preparation, and holistic representation of multiple electroactive components make this approach a promising complement to existing chromatographic methods for quality assessment of traditional Chinese medicine formulations.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100849"},"PeriodicalIF":1.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651403","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 : 2024-11-05DOI: 10.1016/j.ijoes.2024.100869
Guobin Yang , Huaiyan Qi , Xueying Wu , An Liu , Shaohua Zhang , Jintao Zhang
The corrosion inhibition performance of the thioureido imidazoline (TU-IM) corrosion inhibitor, along with three surfactants, was assessed for X80 carbon steels in a CO2-saturated NaCl solution using weight loss tests, electrochemical and microstructural characterization. Results demonstrate that the corrosion-inhibition efficiency of surfactants improves with increasing alkyl-chain length in the following order: cetyltrimethylammonium bromide (CTAB) > tetradecyltrimethylammonium bromide (TTAB) > dodecyltrimethylammonium bromide (DTAB). A synergistic corrosion inhibition effect between TU-IM and DTAB/TTAB was observed, with the best performance achieved using 10 mg/L TU-IM and 10 mg/L DTAB/TTAB (inhibition efficiency: 97.68 %), which is mainly attributed to the cooperative adsorption of both substances. By contrast, the synergistic inhibition capability of TU-IM with the surfactants decreased as the alkyl-chain length increased, and even an antagonistic effect was noted for the combination of TU-IM + CTAB owing to the competitive adsorption between the surfactant and the corrosion inhibitor.
{"title":"Synergistic inhibition effect of thioureido imidazoline and cationic surfactants with different alkyl chain lengths on X80 carbon steel in CO2-saturated NaCl solutions","authors":"Guobin Yang , Huaiyan Qi , Xueying Wu , An Liu , Shaohua Zhang , Jintao Zhang","doi":"10.1016/j.ijoes.2024.100869","DOIUrl":"10.1016/j.ijoes.2024.100869","url":null,"abstract":"<div><div>The corrosion inhibition performance of the thioureido imidazoline (TU-IM) corrosion inhibitor, along with three surfactants, was assessed for X80 carbon steels in a CO<sub>2</sub>-saturated NaCl solution using weight loss tests, electrochemical and microstructural characterization. Results demonstrate that the corrosion-inhibition efficiency of surfactants improves with increasing alkyl-chain length in the following order: cetyltrimethylammonium bromide (CTAB) > tetradecyltrimethylammonium bromide (TTAB) > dodecyltrimethylammonium bromide (DTAB). A synergistic corrosion inhibition effect between TU-IM and DTAB/TTAB was observed, with the best performance achieved using 10 mg/L TU-IM and 10 mg/L DTAB/TTAB (inhibition efficiency: 97.68 %), which is mainly attributed to the cooperative adsorption of both substances. By contrast, the synergistic inhibition capability of TU-IM with the surfactants decreased as the alkyl-chain length increased, and even an antagonistic effect was noted for the combination of TU-IM + CTAB owing to the competitive adsorption between the surfactant and the corrosion inhibitor.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100869"},"PeriodicalIF":1.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651644","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 : 2024-11-05DOI: 10.1016/j.ijoes.2024.100870
Xianwen Zhang , Hao Peng , Feiyue Cao , Yaoyi Cao , Qingxin Liu , Chizhou Tang , Taotao Zhou
The electrochemical conversion of carbon dioxide (CO2) into basic chemicals or carbon-based fuels is a promising new strategy for carbon resource utilization. Within this domain, solid-electrolyte CO2 electrolyzer demonstrate significant potential for the continuous production of pure formic acid solutions. This study, leveraging a 4 cm2 visualization electrolyzer, explores the impact of three working condition parameters on performance: working voltage, gas flow rate, and the intermediate chamber water flow rate. It compares the variations in current density, formic acid concentration, and the distribution of liquid water on the cathode side under different working conditions. The results indicate that the working voltage, current density, and formic acid yield are all positively correlated; overly low gas flow rates can lead to CO2 deficiency and diminished electrolyzer performance; concentration control of the formic acid solution is effectively achieved by adjusting the intermediate chamber water flow rate; and during the electrolyzer reaction process, almost all of the liquid water is positioned at the bends downstream of the cathode flow channel.
{"title":"Study on the influence characteristics of multi-working condition parameters on membrane electrode type CO2 electrolyzer","authors":"Xianwen Zhang , Hao Peng , Feiyue Cao , Yaoyi Cao , Qingxin Liu , Chizhou Tang , Taotao Zhou","doi":"10.1016/j.ijoes.2024.100870","DOIUrl":"10.1016/j.ijoes.2024.100870","url":null,"abstract":"<div><div>The electrochemical conversion of carbon dioxide (CO<sub>2</sub>) into basic chemicals or carbon-based fuels is a promising new strategy for carbon resource utilization. Within this domain, solid-electrolyte CO<sub>2</sub> electrolyzer demonstrate significant potential for the continuous production of pure formic acid solutions. This study, leveraging a 4 cm<sup>2</sup> visualization electrolyzer, explores the impact of three working condition parameters on performance: working voltage, gas flow rate, and the intermediate chamber water flow rate. It compares the variations in current density, formic acid concentration, and the distribution of liquid water on the cathode side under different working conditions. The results indicate that the working voltage, current density, and formic acid yield are all positively correlated; overly low gas flow rates can lead to CO<sub>2</sub> deficiency and diminished electrolyzer performance; concentration control of the formic acid solution is effectively achieved by adjusting the intermediate chamber water flow rate; and during the electrolyzer reaction process, almost all of the liquid water is positioned at the bends downstream of the cathode flow channel.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"19 12","pages":"Article 100870"},"PeriodicalIF":1.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651643","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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