Mihye Wu, Jungdon Suk, J. Jo, Yeon Kim, Sungho Choi, Dong-Wook Kim, Yongku Kang, Ha-Kyun Jung
{"title":"Carbon-Free AZO/Ru Cathode for Li-Air Batteries","authors":"Mihye Wu, Jungdon Suk, J. Jo, Yeon Kim, Sungho Choi, Dong-Wook Kim, Yongku Kang, Ha-Kyun Jung","doi":"10.1149/2.0011507EEL","DOIUrl":"https://doi.org/10.1149/2.0011507EEL","url":null,"abstract":"","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0011507EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64303534","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}
We report a new characterization method that detects liquid water breakthrough in porous materials by measuring changes in relative humidity and electrochemical impedance simultaneously. Unlike previous work based on capillary pressure, a four-chamber tool was developed to monitor the pressure and dew point temperature across porous transport layer materials. This approach can characterize the structure and water transport behavior of carbonaceous materials for polymer electrolyte fuel cells and electrolyzers. The changes in the dew point, impedance, and pressure provide a reliable and fast indicator to predict the liquid water breakthrough.
{"title":"An Approach to Measure the Water Breakthrough in Porous Carbon Materials","authors":"M. Schwager, S. Dhanushkodi, W. Mérida","doi":"10.1149/2.0071504EEL","DOIUrl":"https://doi.org/10.1149/2.0071504EEL","url":null,"abstract":"We report a new characterization method that detects liquid water breakthrough in porous materials by measuring changes in relative humidity and electrochemical impedance simultaneously. Unlike previous work based on capillary pressure, a four-chamber tool was developed to monitor the pressure and dew point temperature across porous transport layer materials. This approach can characterize the structure and water transport behavior of carbonaceous materials for polymer electrolyte fuel cells and electrolyzers. The changes in the dew point, impedance, and pressure provide a reliable and fast indicator to predict the liquid water breakthrough.","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0071504EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64328024","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}
We report an impedance biosensor utilizing a Si electrode created by wet chemical deposition atop 6061 Al alloy. The sensor electrode is created by galvanic/electroless Si deposition from an electrolyte containing 10 mM HF and 20 mM Na2SiF6 in 80 wt% formic acid, followed by antibody immobilization. The impedance response of the sensor electrode to increasing concentrations of peanut protein Ara h 1, a common food allergen, can be fit to an equivalent circuit containing three RC loops. The circuit element most sensitive to antigen binding is the charge transfer resistance, yielding a detection limit of 4 ng/mL. Biosensors that utilize electrochemical impedance spectroscopy have been employed with a wide variety of immobilized biomolecules, including antibodies, receptor proteins, aptamers, and ssDNA. These biomolecules must be immobilized atop a conductive and biocompatible substrate, which is most commonly accomplished by amide bond formation to carboxylate-terminated Au-thiol self-assembled monolayers. However, Au-thiol self-assembly chemistry has been reported to have inadequate stability for many applications, with a shelf life limited to days to weeks. In addition, most sensors need to be calibrated, which for antibodybased biosensors requires antibody unfolding. For this reason, durable chemistry for antibody immobilization is also needed for biosensor regeneration during such a calibration procedure. In addition to Au, other biocompatible substrate materials that have been employed for impedance biosensors include C, Si, Pt, Ti, and ITO. Si is intriguing as a biosensor substrate, since it is directly below C in the periodic table, so Si-C bonds are of comparable strength to C-C and Si-Si bonds. Additional advantages of Si substrates for biosensors include easier incorporation into ULSI devices and easier surface preparation relative to C. Room temperature combined galvanic and electroless deposition of compact Si films was recently reported from concentrated formic acid. Here these Si films are used for immobilization of the mouse monoclonal antibody to peanut protein Ara h 1, and subsequent impedance detection of the protein antigen. Peanuts are considered one of the most dangerous food allergens, with severe anaphylactic reactions causing over 100 fatalities in the United States alone each year. Nine possible allergens within peanuts have been identified, Ara h 1 to Ara h 8, and peanut oleosin, with Ara h 1 the most widely studied.
我们报告了一种阻抗生物传感器，利用湿化学沉积在6061铝合金上的硅电极。传感器电极由含有10 mM HF和20 mM Na2SiF6的电解液在80 wt%甲酸中进行电/化学硅沉积而成，然后进行抗体固定化。该传感器电极对花生蛋白Ara h 1(一种常见的食物过敏原)浓度增加的阻抗响应可以适用于包含三个RC回路的等效电路。对抗原结合最敏感的电路元件是电荷转移电阻，检测限为4 ng/mL。利用电化学阻抗谱的生物传感器已被广泛应用于各种固定化生物分子，包括抗体、受体蛋白、适体和ssDNA。这些生物分子必须固定在导电和生物相容性的底物上，这通常是通过酰胺键形成羧基端金硫醇自组装单层来完成的。然而，据报道，金硫醇自组装化学在许多应用中稳定性不足，其保质期仅限于几天到几周。此外，大多数传感器需要校准，这对于基于抗体的生物传感器需要抗体展开。因此，在这样的校准过程中，生物传感器的再生也需要持久的抗体固定化学。除Au外，其他生物相容性衬底材料已用于阻抗生物传感器，包括C、Si、Pt、Ti和ITO。作为生物传感器衬底，硅是很有趣的，因为它在元素周期表中直接低于C，所以硅-C键的强度与C-C和硅-硅键相当。用于生物传感器的Si衬底的其他优点包括更容易并入ULSI器件，相对于c更容易进行表面制备。最近报道了用浓甲酸在室温下结合电法和化学法沉积致密的Si薄膜。在这里，这些Si薄膜用于固定小鼠花生蛋白Ara h 1单克隆抗体，并随后进行蛋白抗原的阻抗检测。花生被认为是最危险的食物过敏原之一，仅在美国，每年就有100多人因严重的过敏反应而死亡。花生中已经确定了9种可能的过敏原，Ara h1到Ara h8和花生油蛋白，其中Ara h1被研究得最广泛。
{"title":"Impedance Biosensor Utilizing a Si Substrate Deposited by Wet Methods","authors":"B. Falola, R. Radhakrishnan, I. Suni","doi":"10.1149/2.0081507EEL","DOIUrl":"https://doi.org/10.1149/2.0081507EEL","url":null,"abstract":"We report an impedance biosensor utilizing a Si electrode created by wet chemical deposition atop 6061 Al alloy. The sensor electrode is created by galvanic/electroless Si deposition from an electrolyte containing 10 mM HF and 20 mM Na2SiF6 in 80 wt% formic acid, followed by antibody immobilization. The impedance response of the sensor electrode to increasing concentrations of peanut protein Ara h 1, a common food allergen, can be fit to an equivalent circuit containing three RC loops. The circuit element most sensitive to antigen binding is the charge transfer resistance, yielding a detection limit of 4 ng/mL. Biosensors that utilize electrochemical impedance spectroscopy have been employed with a wide variety of immobilized biomolecules, including antibodies, receptor proteins, aptamers, and ssDNA. These biomolecules must be immobilized atop a conductive and biocompatible substrate, which is most commonly accomplished by amide bond formation to carboxylate-terminated Au-thiol self-assembled monolayers. However, Au-thiol self-assembly chemistry has been reported to have inadequate stability for many applications, with a shelf life limited to days to weeks. In addition, most sensors need to be calibrated, which for antibodybased biosensors requires antibody unfolding. For this reason, durable chemistry for antibody immobilization is also needed for biosensor regeneration during such a calibration procedure. In addition to Au, other biocompatible substrate materials that have been employed for impedance biosensors include C, Si, Pt, Ti, and ITO. Si is intriguing as a biosensor substrate, since it is directly below C in the periodic table, so Si-C bonds are of comparable strength to C-C and Si-Si bonds. Additional advantages of Si substrates for biosensors include easier incorporation into ULSI devices and easier surface preparation relative to C. Room temperature combined galvanic and electroless deposition of compact Si films was recently reported from concentrated formic acid. Here these Si films are used for immobilization of the mouse monoclonal antibody to peanut protein Ara h 1, and subsequent impedance detection of the protein antigen. Peanuts are considered one of the most dangerous food allergens, with severe anaphylactic reactions causing over 100 fatalities in the United States alone each year. Nine possible allergens within peanuts have been identified, Ara h 1 to Ara h 8, and peanut oleosin, with Ara h 1 the most widely studied.","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0081507EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64332794","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}
C. Lim, A. S. Alavijeh, M. Lauritzen, Joanna Kolodziej, S. Knights, E. Kjeang
A CeO2 supported membrane electrode assembly (MEA) was fabricated by hot-pressing CeO2-coated electrodes and a PFSA ionomer membrane. Upon application of a combined chemical and mechanical accelerated stress test (AST), the CeO2 supported MEA showed six times longer lifetime and 40 times lower fluoride emission rate than a baseline MEA without cerium. The membrane in the CeO2 supported MEA effectively retained its original thickness and ductility despite the highly aggressive AST conditions. Most of the cerium applied on the anode migrated into the membrane and provided excellent mitigation of joint chemical and mechanical membrane degradation.
{"title":"Fuel Cell Durability Enhancement with Cerium Oxide under Combined Chemical and Mechanical Membrane Degradation","authors":"C. Lim, A. S. Alavijeh, M. Lauritzen, Joanna Kolodziej, S. Knights, E. Kjeang","doi":"10.1149/2.0081504EEL","DOIUrl":"https://doi.org/10.1149/2.0081504EEL","url":null,"abstract":"A CeO2 supported membrane electrode assembly (MEA) was fabricated by hot-pressing CeO2-coated electrodes and a PFSA ionomer membrane. Upon application of a combined chemical and mechanical accelerated stress test (AST), the CeO2 supported MEA showed six times longer lifetime and 40 times lower fluoride emission rate than a baseline MEA without cerium. The membrane in the CeO2 supported MEA effectively retained its original thickness and ductility despite the highly aggressive AST conditions. Most of the cerium applied on the anode migrated into the membrane and provided excellent mitigation of joint chemical and mechanical membrane degradation.","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0081504EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64332844","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. Yousef, R. Brooks, M. Abdelkareem, Jabril A. Khamaj, M. M. El-Halwany, N. Barakat, M. El-Newehy, H. Kim
{"title":"Electrospun NiCu Nanoalloy Decorated on Carbon Nanofibers as Chemical Stable Electrocatalyst for Methanol Oxidation","authors":"A. Yousef, R. Brooks, M. Abdelkareem, Jabril A. Khamaj, M. M. El-Halwany, N. Barakat, M. El-Newehy, H. Kim","doi":"10.1149/2.0091509EEL","DOIUrl":"https://doi.org/10.1149/2.0091509EEL","url":null,"abstract":"","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0091509EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64336492","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}
Yazhou Zhang, G. Ding, Hong Wang, P. Cheng, Jiangbo Luo
{"title":"Effect of Seed Layer Thickness Distribution on 3D Integrated Through-Silicon-Vias (TSVs) Filling Model","authors":"Yazhou Zhang, G. Ding, Hong Wang, P. Cheng, Jiangbo Luo","doi":"10.1149/2.0111506EEL","DOIUrl":"https://doi.org/10.1149/2.0111506EEL","url":null,"abstract":"","PeriodicalId":11470,"journal":{"name":"ECS Electrochemistry Letters","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1149/2.0111506EEL","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64343749","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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