Edna Jerusa Pacheco Sampaio, Adilar Gonçalves dos Santos Júnior, Cristiano Campos Araújo, Célia de Fraga Malfatti
{"title":"A Review on Pseudocapacitors: Advances in Nb Oxide - Sodium-Ion Systems","authors":"Edna Jerusa Pacheco Sampaio, Adilar Gonçalves dos Santos Júnior, Cristiano Campos Araújo, Célia de Fraga Malfatti","doi":"10.37155/2717-526x-0501-6","DOIUrl":"https://doi.org/10.37155/2717-526x-0501-6","url":null,"abstract":"Pseudocapacitive supercapacitors have emerged as an important alternative to storage electrochemical energy. Among the several possible configurations of material for electrodes and electrolyte composition, the combination of oxides containing niobium and electrolytes based on sodium-ion has been presented as a very promising set. This review summarizes the main advances in the development of supercapacitors that use the Nb oxide - sodium-ion system. The electrochemical energy storage mechanisms are described and the influence of the type of electrolyte (aqueous or non-aqueous) is discussed. It was possible to verify that non-aqueous electrolytes are widely more used to assemble the Nb oxide - sodium-ion arrangements. For these systems the energy storage is controlled by the mechanism of intercalation/deintercalation of sodium-ions in the oxide structure. Despite non-aqueous electrolytes exhibit the advantage of operating in a wider window potential, they have disadvantages such as low electrical conductivity and sluggish Na+ kinetics. To overcome these aspects, works in the field have generally focused on improving the properties of the oxides, especially concerning its conductivity through core@shell systems, composites or doping. On the other hand, few studies were found in the literature concerning the Nb oxide - sodium-ion systems that use aqueous electrolytes. Nevertheless, these works showed promising results such as an expansion of the potential window usually used in aqueous electrolytes or the possibility to apply the Nb oxide as cathode or anode.","PeriodicalId":491216,"journal":{"name":"Advanced Materials Science and Technology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135551073","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}
{"title":"The Effect of Ultrasonic Cavitation on Surficial Properties of Metals and Industrial Processes","authors":"Haitao Zheng, Mkhulu Mathe","doi":"10.37155/2717-526x-0501-5","DOIUrl":"https://doi.org/10.37155/2717-526x-0501-5","url":null,"abstract":"Ultrasonic cavitation is a phenomenon that occurs when high-frequency sound waves are introduced into a liquid medium, causing the formation and collapse of small bubbles within the liquid. These bubbles generate high-energy shock waves that can change the surface of nearby materials, leading to various physical and chemical effects. In this review, we briefly summarized the influence of ultrasonic cavitation on the surficial properties of metals and some industrial processes, particularly focusing on the effects of surface roughness, surface cleaning, and surface activation/modification and surface corrosion.","PeriodicalId":491216,"journal":{"name":"Advanced Materials Science and Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135441089","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}
{"title":"An Insight to the Various Applications of Hydroxyapatite","authors":"Quentin Ray Tjieh Lim, Xin Yi Cheng, Chien Yi Wee","doi":"10.37155/2717-526x-0502-1","DOIUrl":"https://doi.org/10.37155/2717-526x-0502-1","url":null,"abstract":"","PeriodicalId":491216,"journal":{"name":"Advanced Materials Science and Technology","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134980875","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}
{"title":"The Thermal Kinetics of Methanol Oxidation on Pt/MWCNT Electrocatalysts in Alkaline Media","authors":"Haitao Zheng, Mmalewane Modibedi","doi":"10.37155/2717-526x-0501-7","DOIUrl":"https://doi.org/10.37155/2717-526x-0501-7","url":null,"abstract":"In this study, the thermal electrooxidation of methanol on a Pt/MWCNT catalyst was examined in alkaline media across the temperature range of 298-363 K. The investigation utilized cyclic voltammetry (CV), quasi-state polarization, and electrochemical impedance spectroscopy (EIS) methods to explore the kinetics of the methanol electrooxidation reaction (MEOR). At elevated temperatures, the kinetics of methanol electro-oxidation on the Pt/MWCNT catalyst within an alkaline solution (1.0 mol/L KOH) were notably accelerated compared to room temperature. This acceleration can be attributed to the reduced methanol dehydrogenation reaction at relatively low temperatures. The Tafel slopes experienced changes as the temperature increased. These variations in Tafel slopes are likely linked to alterations in the rate-determining step of the MEOR as a function of temperature. The EIS outcomes revealed a decrease in charge-transfer resistance as temperature increased. This phenomenon is associated with the interplay between interfacial and diffusion impedances, as well as the surface roughness of the highly dispersed electrode surface.","PeriodicalId":491216,"journal":{"name":"Advanced Materials Science and Technology","volume":"2020 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136054193","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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