Adding solid electroactive materials as energy boosters to flow battery tanks provides a path to electrical energy storing systems with unprecedently high specific energy and specific power, that can solve the needs of both automotive and stationary energy storage markets. This work reviews the physical and chemical principles behind this new class of flow batteries, the history of this technology, and the most promising research directions.
{"title":"Flow batteries with solid energy boosters","authors":"Y. Tolmachev, Svetlana V. Starodubceva","doi":"10.5599/jese.1363","DOIUrl":"https://doi.org/10.5599/jese.1363","url":null,"abstract":"Adding solid electroactive materials as energy boosters to flow battery tanks provides a path to electrical energy storing systems with unprecedently high specific energy and specific power, that can solve the needs of both automotive and stationary energy storage markets. This work reviews the physical and chemical principles behind this new class of flow batteries, the history of this technology, and the most promising research directions.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"33 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82432625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present special issue of the Journal of Electrochemical Science and Engineering presents contributions on various kinds of non-toxic conversion coatings on different metal substrates: steel, stainless steel, zinc, copper, aluminum, and the broad range of their properties and applications. Different functions require surface science and surface engineering at a molecular level and are related to the chemical, phase and morphological nature of their surfaces.
{"title":"Advances in processing and characterization of conversion coatings","authors":"J. Bajat","doi":"10.5599/jese.1521","DOIUrl":"https://doi.org/10.5599/jese.1521","url":null,"abstract":"The present special issue of the Journal of Electrochemical Science and Engineering presents contributions on various kinds of non-toxic conversion coatings on different metal substrates: steel, stainless steel, zinc, copper, aluminum, and the broad range of their properties and applications. Different functions require surface science and surface engineering at a molecular level and are related to the chemical, phase and morphological nature of their surfaces.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"71 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88507156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Diazinon or O,O-diethyl-O-(2-isopropyl-4-methyl-6-pyrimidinyl)-O,O-diethyl-O-(2- isopropyl-4-methyl-6-pyrimidinyl)- phosphorothioate, was first registered as an insecticide in the U.S. However, it was categorized in the limited group of pesticides due to high toxicity for birds, aquatic animals, and humans. Like other organophosphorus pesticides, this compound exhibits inhibitory effects on acetylcholinesterase enzyme. The inhibition of the enzyme leads to the accumulation of acetylcholine and causes the death of insects. DZN is considered a toxic compound for humans due to its high adsorption via skin and inhalation, which leads to the emergence of different symptoms of toxicity. When DZN is used for plants, the compound residues in crops enter the food chain, and hence, bring about different problems for human health. Moreover, the compound is easily washed by surface water and enters the groundwater. Its entrance into aquatic environments can negatively affect a wide range of non-targeted organisms. Thus, researchers are seeking to find fast and precise methods for the recognition of DZN. The electrochemical method for recognizing the compound in real samples is preferable to other analytical methods. Because this method can be used without spending time preparing the sample, it is simple, fast, and cost-effective. The present study is an overall review describing electrochemical-based methods for the recognition of DZN. Methods of modifying electrodes with CNT, polymers, biomolecules, and the simultaneous use of multiple methods are evaluated and compared. The influential factors contributing to the improvement of the signal response are also explained.
{"title":"Electrochemical strategies for detection of Diazinon: A review","authors":"Azadeh Lohrasbi‐Nejad","doi":"10.5599/jese.1379","DOIUrl":"https://doi.org/10.5599/jese.1379","url":null,"abstract":"Diazinon or O,O-diethyl-O-(2-isopropyl-4-methyl-6-pyrimidinyl)-O,O-diethyl-O-(2- isopropyl-4-methyl-6-pyrimidinyl)- phosphorothioate, was first registered as an insecticide in the U.S. However, it was categorized in the limited group of pesticides due to high toxicity for birds, aquatic animals, and humans. Like other organophosphorus pesticides, this compound exhibits inhibitory effects on acetylcholinesterase enzyme. The inhibition of the enzyme leads to the accumulation of acetylcholine and causes the death of insects. DZN is considered a toxic compound for humans due to its high adsorption via skin and inhalation, which leads to the emergence of different symptoms of toxicity. When DZN is used for plants, the compound residues in crops enter the food chain, and hence, bring about different problems for human health. Moreover, the compound is easily washed by surface water and enters the groundwater. Its entrance into aquatic environments can negatively affect a wide range of non-targeted organisms. Thus, researchers are seeking to find fast and precise methods for the recognition of DZN. The electrochemical method for recognizing the compound in real samples is preferable to other analytical methods. Because this method can be used without spending time preparing the sample, it is simple, fast, and cost-effective. The present study is an overall review describing electrochemical-based methods for the recognition of DZN. Methods of modifying electrodes with CNT, polymers, biomolecules, and the simultaneous use of multiple methods are evaluated and compared. The influential factors contributing to the improvement of the signal response are also explained.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"28 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76306276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The pulse plasma system is a surface modification method applied to steel samples. In the present study, the effect of the nozzle distance and pulse number parameters were investigated on the modification process. AISI 4140 steel was preferred as the substrate for modification. In this system, the battery capacity and voltage were constant, and, were selected as 800 mF and 3000 V, respectively. The AISI 4140 steel samples were modified by applying 5, 10, and 15 pulses with 40, 50 and 60 mm nozzle distance. The molybdenum consumable electrode was used during the process. The modified surfaces were examined by optical and scanning electron microscope (SEM) and analyzed by X-ray diffractometer (XRD). Vickers microhardness on the cross-section surface of the samples was measured under a load of 50 g for 15 s. Finally, the specimens were exposed to corrosion in 0.5 M NaCl solution. Corrosion tests were realized using the potentiodynamic polarization method. A modified layer on the steel was determined to consist of two layers, the compound layer and the diffusion layer. It was observed that the structure and thickness of the modified layer affect by pulse number and nozzle distance. New phases such as Fe2N, FeN, MoN, and γ-Fe in the modified layer have occurred. The hardness value of the treated sample has risen about 4-5 times than the untreated, depending on applied process parameters. In general, the pulse plasma treatment has improved the corrosion resistance of treated samples. It was observed that while intergranular corrosion has formed on the unmodified surface, pitting corrosion has appeared on the unmodified surfaces.
脉冲等离子体系统是一种用于钢样品表面改性的方法。本文研究了喷嘴距离和脉冲数参数对改性过程的影响。首选AISI 4140钢作为基体进行改性。在本系统中，电池容量和电压恒定，分别选择800 mF和3000 V。分别以40、50和60 mm的喷嘴距离施加5、10和15个脉冲对AISI 4140钢试样进行改性。在此过程中使用了钼消耗性电极。用光学显微镜、扫描电镜(SEM)和x射线衍射仪(XRD)对改性后的表面进行了分析。在50g载荷作用15 s下，测量试样横截面表面的维氏显微硬度。最后，将试样置于0.5 M NaCl溶液中腐蚀。采用动电位极化法进行腐蚀试验。确定了钢表面改性层由复合层和扩散层两层组成。观察到脉冲数和喷嘴距离对改性层的结构和厚度的影响。在改性层中出现了Fe2N、FeN、MoN、γ-Fe等新相。根据应用的工艺参数，处理后样品的硬度值比未处理的硬度值提高了约4-5倍。总的来说，脉冲等离子体处理提高了处理样品的耐腐蚀性。观察到，在未改性的表面上形成了晶间腐蚀，而在未改性的表面上出现了点蚀。
{"title":"The effect of process parameters on microstructure and corrosion behavior of AISI 4140 steel modified by pulse plasma treatment","authors":"Yıldız Yaralı Özbek, A. Demirkıran","doi":"10.5599/jese.1259","DOIUrl":"https://doi.org/10.5599/jese.1259","url":null,"abstract":"The pulse plasma system is a surface modification method applied to steel samples. In the present study, the effect of the nozzle distance and pulse number parameters were investigated on the modification process. AISI 4140 steel was preferred as the substrate for modification. In this system, the battery capacity and voltage were constant, and, were selected as 800 mF and 3000 V, respectively. The AISI 4140 steel samples were modified by applying 5, 10, and 15 pulses with 40, 50 and 60 mm nozzle distance. The molybdenum consumable electrode was used during the process. The modified surfaces were examined by optical and scanning electron microscope (SEM) and analyzed by X-ray diffractometer (XRD). Vickers microhardness on the cross-section surface of the samples was measured under a load of 50 g for 15 s. Finally, the specimens were exposed to corrosion in 0.5 M NaCl solution. Corrosion tests were realized using the potentiodynamic polarization method. A modified layer on the steel was determined to consist of two layers, the compound layer and the diffusion layer. It was observed that the structure and thickness of the modified layer affect by pulse number and nozzle distance. New phases such as Fe2N, FeN, MoN, and γ-Fe in the modified layer have occurred. The hardness value of the treated sample has risen about 4-5 times than the untreated, depending on applied process parameters. In general, the pulse plasma treatment has improved the corrosion resistance of treated samples. It was observed that while intergranular corrosion has formed on the unmodified surface, pitting corrosion has appeared on the unmodified surfaces.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"21 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81533068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new voltammetric sensor is proposed for the determination of bisphenol A, using a glassy carbon electrode (GCE) modified with Fe3O4/graphene oxide (GO) nanocomposite. The modification of the electrode surface was performed by dispersion drop-casting. The electrochemical behavior of bisphenol A was evaluated by cyclic voltammetry (CV). The oxidation peak was observed during the anodic potential scan at potentials of 0.45 V. Higher anodic peak currents (Ipa) were observed at Fe3O4/GO/GCE modified electrode than at bare GCE. The electrochemical determination by differential pulse voltammetry (DPV) revealed a linear response in the concentration range of 1.0×10-7 to 5.0×10-5 M, with a detection limit of 9.0×10-8 M. The proposed method was successfully applied using water samples, with good recoveries.
{"title":"Fe3O4/GO nanocomposite modified glassy carbon electrode as a novel voltammetric sensor for determination of bisphenol A","authors":"Fariba Beigmoradi, H. Beitollahi","doi":"10.5599/jese.1482","DOIUrl":"https://doi.org/10.5599/jese.1482","url":null,"abstract":"A new voltammetric sensor is proposed for the determination of bisphenol A, using a glassy carbon electrode (GCE) modified with Fe3O4/graphene oxide (GO) nanocomposite. The modification of the electrode surface was performed by dispersion drop-casting. The electrochemical behavior of bisphenol A was evaluated by cyclic voltammetry (CV). The oxidation peak was observed during the anodic potential scan at potentials of 0.45 V. Higher anodic peak currents (Ipa) were observed at Fe3O4/GO/GCE modified electrode than at bare GCE. The electrochemical determination by differential pulse voltammetry (DPV) revealed a linear response in the concentration range of 1.0×10-7 to 5.0×10-5 M, with a detection limit of 9.0×10-8 M. The proposed method was successfully applied using water samples, with good recoveries.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"45 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81547970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Ushchapovskiy, V. Vorobyova, G. Vasyliev, O. Linyucheva
The process of electrodeposition of nickel coatings from electrolytes based on a deep eutectic solvent (DES) mixture of choline chloride and lactic acid with a molar ratio of 1:3 was studied. The physicochemical properties and characteristics of DES, namely, conductivity, FT-IR and NMR analysis were determined. FT-IR results confirmed that H-bonds occurring between two components in DES were the main force leading to the eutectic formation. Electrochemical techniques were used to characterize the deposition process and scanning electron microscopy was used to study the deposit morphology. Based on polarization measurements, it has been found that at NiCl2·6H2O content of 1.14 M and a temperature of 75 °C, the limiting current density of nickel electrodeposition was near 2 A dm-2. The polarization of the cathodic nickel deposition varied within -0.63 to 1.1 V at current density of 0.25 A dm-2 It has been shown that an increase of water content in the electrolyte does not significantly affect the current efficiency of the nickel electrodeposition process, which was in a range 85-93 %. However, the increase in water content contributes to the increase of heterogeneity and crystal grains size distribution of galvanic deposits. The established values of the Wagner number indicate the predominance of the primary current density distribution in the process of electrodeposition of nickel coatings. Galvanic coatings possess a highly developed nanostructured surface, exhibit increased capillary properties, and can be used as electrode materials for the process of electrolysis of water.
研究了氯化胆碱与乳酸摩尔比为1:3的深共熔溶剂(DES)电解液电沉积镍镀层的工艺。测定了DES的物理化学性质和特征，即电导率、FT-IR和NMR分析。FT-IR结果证实了DES中两组分之间的氢键是导致共晶形成的主要力量。利用电化学技术对沉积过程进行表征，并利用扫描电镜对沉积形貌进行研究。在NiCl2·6H2O含量为1.14 M、温度为75℃时，电沉积镍的极限电流密度接近2 a dm-2。在0.25 A dm-2的电流密度下，阴极镍沉积的极化变化范围在-0.63 ~ 1.1 V之间。结果表明，电解液含水量的增加对镍电沉积过程的电流效率影响不显著，在85 ~ 93%之间。但随着水含量的增加，电镀层的非均质性和晶粒尺寸分布增加。瓦格纳数的确定值表明，在镍镀层电沉积过程中，初级电流密度分布占主导地位。电镀层具有高度发达的纳米结构表面，具有增强的毛细管性能，可以用作电解水过程的电极材料。
{"title":"Electrodeposition of polyfunctional Ni coatings from deep eutectic solvent based on choline chloride and lactic acid","authors":"D. Ushchapovskiy, V. Vorobyova, G. Vasyliev, O. Linyucheva","doi":"10.5599/jese.1451","DOIUrl":"https://doi.org/10.5599/jese.1451","url":null,"abstract":"The process of electrodeposition of nickel coatings from electrolytes based on a deep eutectic solvent (DES) mixture of choline chloride and lactic acid with a molar ratio of 1:3 was studied. The physicochemical properties and characteristics of DES, namely, conductivity, FT-IR and NMR analysis were determined. FT-IR results confirmed that H-bonds occurring between two components in DES were the main force leading to the eutectic formation. Electrochemical techniques were used to characterize the deposition process and scanning electron microscopy was used to study the deposit morphology. Based on polarization measurements, it has been found that at NiCl2·6H2O content of 1.14 M and a temperature of 75 °C, the limiting current density of nickel electrodeposition was near 2 A dm-2. The polarization of the cathodic nickel deposition varied within -0.63 to 1.1 V at current density of 0.25 A dm-2 It has been shown that an increase of water content in the electrolyte does not significantly affect the current efficiency of the nickel electrodeposition process, which was in a range 85-93 %. However, the increase in water content contributes to the increase of heterogeneity and crystal grains size distribution of galvanic deposits. The established values of the Wagner number indicate the predominance of the primary current density distribution in the process of electrodeposition of nickel coatings. Galvanic coatings possess a highly developed nanostructured surface, exhibit increased capillary properties, and can be used as electrode materials for the process of electrolysis of water.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"11 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86987171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Nazario-Naveda, S. Rojas-Flores, Moisés Gallozzo-Cardenas, L. Juárez-Cortijo, L. Angelats-Silva
In this study, the effect of operating temperature at 55 °C on xLi2MnO3-(1-x)LiMn0.5Ni0.5O2 electrodes during the charge/discharge process at different current densities was investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for structural and morphological analysis of the fabricated cathode materials, while charge-discharge curves and differential capacity were used to study the electrochemical behavior. Results confirm the formation of the structures with two phases associated with the components of the layered material. It was found that at 55 °C, a capacity higher than 357 mAh g-1 could be achieved at a voltage of 2.5-4.8 V vs. Li/Li+, which was larger than the capacity achieved at room temperature. At 55 °C, a change in valence could be observed during charging and discharging due to the change in the position of the peaks associated with Mn and Ni, highlighting cathodic material with x = 0.5 as the material that retains the layered structure at this temperature. This work confirms the good performance of electrodes made with this material at elevated temperatures and gives a better understanding of its electrochemical behavior.
本研究考察了不同电流密度下，55℃工作温度对xLi2MnO3-(1-x)LiMn0.5Ni0.5O2电极充放电过程的影响。利用x射线衍射(XRD)和扫描电镜(SEM)对制备的正极材料进行了结构和形态分析，并利用充放电曲线和差分容量对其电化学行为进行了研究。结果证实了两相结构的形成与层状材料的成分有关。研究发现，在55℃下，在2.5 ~ 4.8 V vs. Li/Li+电压下，电池容量可达到357 mAh g-1以上，比室温下的容量要大。在55°C时，由于Mn和Ni相关峰位置的变化，在充放电过程中可以观察到价态的变化，突出显示x = 0.5的阴极材料在该温度下保留了层状结构。这项工作证实了用这种材料制成的电极在高温下的良好性能，并对其电化学行为有了更好的理解。
{"title":"Influence of operating temperature on the activation efficiency of Li-ion cells with xLi2MnO3-(1-x)LiMn0.5Ni0.5O2 electrodes","authors":"R. Nazario-Naveda, S. Rojas-Flores, Moisés Gallozzo-Cardenas, L. Juárez-Cortijo, L. Angelats-Silva","doi":"10.5599/jese.1458","DOIUrl":"https://doi.org/10.5599/jese.1458","url":null,"abstract":"In this study, the effect of operating temperature at 55 °C on xLi2MnO3-(1-x)LiMn0.5Ni0.5O2 electrodes during the charge/discharge process at different current densities was investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for structural and morphological analysis of the fabricated cathode materials, while charge-discharge curves and differential capacity were used to study the electrochemical behavior. Results confirm the formation of the structures with two phases associated with the components of the layered material. It was found that at 55 °C, a capacity higher than 357 mAh g-1 could be achieved at a voltage of 2.5-4.8 V vs. Li/Li+, which was larger than the capacity achieved at room temperature. At 55 °C, a change in valence could be observed during charging and discharging due to the change in the position of the peaks associated with Mn and Ni, highlighting cathodic material with x = 0.5 as the material that retains the layered structure at this temperature. This work confirms the good performance of electrodes made with this material at elevated temperatures and gives a better understanding of its electrochemical behavior.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"2 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79256492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohammed Saquib Khan, Preeti Shakya, N. Bhardwaj, Deependra Jhankal, A. Sharma, M. K. Banerjee, K. Sachdev
Flexible electronic devices find wide application in wearable electronics and foldable gadgets. This article reports chemical vapor deposited (CVD) few-layers graphene for a solid-state flexible supercapacitor device. Raman spectroscopy analysis reveals up to five layers in the graphene samples. Polyvinyl alcohol-Na2SO4 hydrogel membrane is used as a gel polymer electrolyte (GPE). 50 nm thick silver (Ag) deposited on polyethylene terephthalate (PET) through E-beam deposition served as the flexible current collector for the device. Galvanostatic charge-discharge (GCD) executed on the fabricated device to analyze its electrochemical performance yielded a specific areal capacitance of 15.3 mF cm-2 at 0.05 mA cm-2 current density. The obtained power density of the fabricated device is 0.53 µWh cm-2 at a power density of 25 µW cm-2.
柔性电子器件在可穿戴电子产品和可折叠电子产品中有着广泛的应用。本文报道了一种用于固态柔性超级电容器器件的化学气相沉积(CVD)多层石墨烯。拉曼光谱分析显示石墨烯样品中多达五层。聚乙烯醇- na2so4水凝胶膜作为凝胶聚合物电解质(GPE)。50 nm厚的银(Ag)通过电子束沉积在聚对苯二甲酸乙二醇酯(PET)上，作为器件的柔性集流器。通过恒流充放电(GCD)对制备的器件进行电化学性能分析，在0.05 mA cm-2电流密度下，其比面电容为15.3 mF cm-2。当功率密度为25 μ W cm-2时，器件的功率密度为0.53µWh cm-2。
{"title":"Chemical vapor deposited graphene-based quasi-solid-state ultrathin and flexible sodium-ion supercapacitor","authors":"Mohammed Saquib Khan, Preeti Shakya, N. Bhardwaj, Deependra Jhankal, A. Sharma, M. K. Banerjee, K. Sachdev","doi":"10.5599/jese.1411","DOIUrl":"https://doi.org/10.5599/jese.1411","url":null,"abstract":"Flexible electronic devices find wide application in wearable electronics and foldable gadgets. This article reports chemical vapor deposited (CVD) few-layers graphene for a solid-state flexible supercapacitor device. Raman spectroscopy analysis reveals up to five layers in the graphene samples. Polyvinyl alcohol-Na2SO4 hydrogel membrane is used as a gel polymer electrolyte (GPE). 50 nm thick silver (Ag) deposited on polyethylene terephthalate (PET) through E-beam deposition served as the flexible current collector for the device. Galvanostatic charge-discharge (GCD) executed on the fabricated device to analyze its electrochemical performance yielded a specific areal capacitance of 15.3 mF cm-2 at 0.05 mA cm-2 current density. The obtained power density of the fabricated device is 0.53 µWh cm-2 at a power density of 25 µW cm-2.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"29 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90096367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A highly selective electrochemical sensor modified with CuFe2O4 nanoparticles and the ionic liquid was constructed for the detection of vanillin. The sensor could recognize vanillin from its analogs and possible coexistent substances. The response peak current and vanillin concentration showed a good linear relationship in the range of 0.01 - 300.0 μM, with a sensitivity of 0.0923 μA μM-1. The detection limit was 0.008 μM (S/N = 3). Besides, the reproducibility and stability measurements were also evaluated. It was applied to the determination of vanillin in real samples with satisfactory results.
{"title":"An electrochemical sensor for detection of vanillin in food samples using CuFe2O4 nanoparticles/ionic liquids modified carbon paste electrode","authors":"Afsaneh Hajializadeh","doi":"10.5599/jese.1395","DOIUrl":"https://doi.org/10.5599/jese.1395","url":null,"abstract":"A highly selective electrochemical sensor modified with CuFe2O4 nanoparticles and the ionic liquid was constructed for the detection of vanillin. The sensor could recognize vanillin from its analogs and possible coexistent substances. The response peak current and vanillin concentration showed a good linear relationship in the range of 0.01 - 300.0 μM, with a sensitivity of 0.0923 μA μM-1. The detection limit was 0.008 μM (S/N = 3). Besides, the reproducibility and stability measurements were also evaluated. It was applied to the determination of vanillin in real samples with satisfactory results.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"125 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90567616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a comprehensive overview of recent developments in the many different types of biopolymer coatings used in biomedical applications is presented. Biopolymer coatings have tremendous promise in various biological applications due to their adaptability. Polymer coatings may be used to improve surface qualities to fulfill certain criteria or to include extra capabilities for various biomedical applications. This analysis focuses mostly on certain polymers for usage in coating applications as well as a variety of polymer coatings that provide enhanced functionalization. The most recent findings from relevant research have been presented on using polymer coatings on nanoparticles for biological applications. Moreover, the latest research on biopolymer coatings for improved tissue engineering and drug delivery on various substrates and nanoparticles has been reported. Additionally, the most recent scientific breakthroughs have been compiled.
{"title":"Applications of biopolymer coatings in biomedical engineering","authors":"Jashanpreet Sing, Simranjit Singh, R. Gill","doi":"10.5599/jese.1460","DOIUrl":"https://doi.org/10.5599/jese.1460","url":null,"abstract":"In this paper, a comprehensive overview of recent developments in the many different types of biopolymer coatings used in biomedical applications is presented. Biopolymer coatings have tremendous promise in various biological applications due to their adaptability. Polymer coatings may be used to improve surface qualities to fulfill certain criteria or to include extra capabilities for various biomedical applications. This analysis focuses mostly on certain polymers for usage in coating applications as well as a variety of polymer coatings that provide enhanced functionalization. The most recent findings from relevant research have been presented on using polymer coatings on nanoparticles for biological applications. Moreover, the latest research on biopolymer coatings for improved tissue engineering and drug delivery on various substrates and nanoparticles has been reported. Additionally, the most recent scientific breakthroughs have been compiled.","PeriodicalId":15660,"journal":{"name":"Journal of Electrochemical Science and Engineering","volume":"11 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77464035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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