Pub Date : 2024-08-29DOI: 10.1149/1945-7111/ad7171
Mohamed Abd-Elsabour, Mortaga M. Abou-Krisha, Fatehy M. Abdel-Haleem, Mohamed N. Goda, Mohamed S. Mohy-Eldin
5-Fluorouracil (5-FU) is widely used in the treatment of various cancers, necessitating accurate and sensitive detection techniques. Hybrid materials, combining organic and inorganic components, offer superior electrochemical characteristics, including enhanced conductivity and stability. Herein, NiO nanorods (NiONRs) were synthesized using Mangifera indica leaves extract and decorated with chitosan curcumin analog Schiff base (Cs-Cur-A). The characterization of the NiONRs and Cs-Cur-A were investigated through different techniques including FT-IR, 1HNMR, XRD, SEM, and EDX. A sensitive and selective electrochemical sensor to determine 5-FU was elucidated using a Cs-Cur-A/NiONRs modified glassy carbon electrode (GCE). The anodic peak current of 5-FU was greatly enhanced at the Cs-Cur-A/NiONRs/GCE with pH 7.0 and a scan rate of 50 mV s−1. According to chronoamperometric measurements, the value of diffusion coefficient (D) was estimated to be 2.96 × 10−6 cm2 s−1. Using differential pulse voltammetry (DPV), the fabricated sensor exhibits a wide linear range (0.1–150.0 μM) with a low limit of detection (21.75 nM). Moreover, the proposed sensor was successfully applied to the detection of 5-FU in blood serum and urine samples with high reproducibility, repeatability, and selectivity.
{"title":"Electrochemical Nanomolar Determination of the Anticancer Drug 5-Fluorouracil Using Chitosan Curcumin Schiff Base-Decorated NiO Nanorods Synthesized with Green Method","authors":"Mohamed Abd-Elsabour, Mortaga M. Abou-Krisha, Fatehy M. Abdel-Haleem, Mohamed N. Goda, Mohamed S. Mohy-Eldin","doi":"10.1149/1945-7111/ad7171","DOIUrl":"https://doi.org/10.1149/1945-7111/ad7171","url":null,"abstract":"5-Fluorouracil (5-FU) is widely used in the treatment of various cancers, necessitating accurate and sensitive detection techniques. Hybrid materials, combining organic and inorganic components, offer superior electrochemical characteristics, including enhanced conductivity and stability. Herein, NiO nanorods (NiONRs) were synthesized using <italic toggle=\"yes\">Mangifera indica</italic> leaves extract and decorated with chitosan curcumin analog Schiff base (Cs-Cur-A). The characterization of the NiONRs and Cs-Cur-A were investigated through different techniques including FT-IR, <sup>1</sup>HNMR, XRD, SEM, and EDX. A sensitive and selective electrochemical sensor to determine 5-FU was elucidated using a Cs-Cur-A/NiONRs modified glassy carbon electrode (GCE). The anodic peak current of 5-FU was greatly enhanced at the Cs-Cur-A/NiONRs/GCE with pH 7.0 and a scan rate of 50 mV s<sup>−1</sup>. According to chronoamperometric measurements, the value of diffusion coefficient (D) was estimated to be 2.96 × 10<sup>−6</sup> cm<sup>2 </sup>s<sup>−1</sup>. Using differential pulse voltammetry (DPV), the fabricated sensor exhibits a wide linear range (0.1–150.0 μM) with a low limit of detection (21.75 nM). Moreover, the proposed sensor was successfully applied to the detection of 5-FU in blood serum and urine samples with high reproducibility, repeatability, and selectivity.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"40 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1149/1945-7111/ad7172
Rafiq Ahmad, Marya Khan, 0000-0003-0020-7805Abdullah3, Md. Tabish Rehman, Mohamed F. AlAjmi, Shamshad Alam, Prabhash Mishra, Byeong-Il Lee
Two-dimensional (2D) nanostructures are valued for their ultrathin planar surface and high charge carrier mobility, which offer enhanced sensing capabilities. Herein, we synthesised 2D nanoflake–like copper oxide (CuO) nanostructures using a hydrothermal method for electrochemical riboflavin sensor fabrication. Electrochemical analysis of nanoflake–like CuO modified glassy carbon electrode (GCE) was analysed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The differential pulse voltammetry (DPV) technique was used for testing the electrochemical sensing performance of the fabricated riboflavin sensor. The designed sensor detected riboflavin in concentrations ranging from 10 to 1250 nM with a high sensitivity (571.8 μA/μM cm2) and a limit of detection (LOD) of 6.5 nM. The sensor’s excellent electrocatalytic activity towards riboflavin is primarily attributed to the unique CuO nanoflake–like morphology that provides a high surface area. Furthermore, sensors showed excellent selectivity, reproducibility, and stability, essential attributes for precise riboflavin detection and long-term usage. Overall, the electrochemical sensor based on nanoflake–like CuO nanostructures represents a promising platform for sensitive riboflavin detection. An easy synthesis of 2D nanoflake–like CuO nanostructures provides the possibility of future potential applications of these nanomaterials in analytical chemistry domains such as biomedical diagnostics, food analysis, and environmental monitoring.
{"title":"Electrochemical Riboflavin Detection Using 2D Nanoflake–Like CuO Nanostructure Modified Electrodes","authors":"Rafiq Ahmad, Marya Khan, 0000-0003-0020-7805Abdullah3, Md. Tabish Rehman, Mohamed F. AlAjmi, Shamshad Alam, Prabhash Mishra, Byeong-Il Lee","doi":"10.1149/1945-7111/ad7172","DOIUrl":"https://doi.org/10.1149/1945-7111/ad7172","url":null,"abstract":"Two-dimensional (2D) nanostructures are valued for their ultrathin planar surface and high charge carrier mobility, which offer enhanced sensing capabilities. Herein, we synthesised 2D nanoflake–like copper oxide (CuO) nanostructures using a hydrothermal method for electrochemical riboflavin sensor fabrication. Electrochemical analysis of nanoflake–like CuO modified glassy carbon electrode (GCE) was analysed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The differential pulse voltammetry (DPV) technique was used for testing the electrochemical sensing performance of the fabricated riboflavin sensor. The designed sensor detected riboflavin in concentrations ranging from 10 to 1250 nM with a high sensitivity (571.8 μA/μM cm<sup>2</sup>) and a limit of detection (LOD) of 6.5 nM. The sensor’s excellent electrocatalytic activity towards riboflavin is primarily attributed to the unique CuO nanoflake–like morphology that provides a high surface area. Furthermore, sensors showed excellent selectivity, reproducibility, and stability, essential attributes for precise riboflavin detection and long-term usage. Overall, the electrochemical sensor based on nanoflake–like CuO nanostructures represents a promising platform for sensitive riboflavin detection. An easy synthesis of 2D nanoflake–like CuO nanostructures provides the possibility of future potential applications of these nanomaterials in analytical chemistry domains such as biomedical diagnostics, food analysis, and environmental monitoring.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"40 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1149/1945-7111/ad6cbc
Van Anh Nguyen, Roger C. Newman, Nicholas J. Laycock
A 2-D reaction transport model with the phase field method was employed here to simulate the propagation stage of corrosion pitting in stainless steels in a chloride environment. The influence of the salt film on pitting dissolution kinetics was incorporated into the model to study its effect on the pit morphology under various settings. In potentiostatic conditions, the pit morphology tends toward a dish-like shape due to the presence of the salt film inside a corrosion pit. This leads to diffusion-controlled dissolution at the pit bottom and active dissolution near the pit mouth. On the contrary, in galvanostatic conditions and at a high applied current, although the salt film was initially present, its effect diminished as the chemistry inside the pit became diluted and the pit growth transitioned into active dissolution near the repassivation current. This effect is attributed to the limited resources to support the enlargement of a corrosion pit under constant applied current. As a result, the pit morphology in galvanostatic conditions is likely to be hemispherical and can transition into complex morphology, as discussed in a previous paper.
{"title":"A 2-D Reaction-Transport Model for Investigating Pit Morphology Under the Influence of a Salt Film","authors":"Van Anh Nguyen, Roger C. Newman, Nicholas J. Laycock","doi":"10.1149/1945-7111/ad6cbc","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6cbc","url":null,"abstract":"A 2-D reaction transport model with the phase field method was employed here to simulate the propagation stage of corrosion pitting in stainless steels in a chloride environment. The influence of the salt film on pitting dissolution kinetics was incorporated into the model to study its effect on the pit morphology under various settings. In potentiostatic conditions, the pit morphology tends toward a dish-like shape due to the presence of the salt film inside a corrosion pit. This leads to diffusion-controlled dissolution at the pit bottom and active dissolution near the pit mouth. On the contrary, in galvanostatic conditions and at a high applied current, although the salt film was initially present, its effect diminished as the chemistry inside the pit became diluted and the pit growth transitioned into active dissolution near the repassivation current. This effect is attributed to the limited resources to support the enlargement of a corrosion pit under constant applied current. As a result, the pit morphology in galvanostatic conditions is likely to be hemispherical and can transition into complex morphology, as discussed in a previous paper.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"7 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Improvement in durability is one of the important subjects for utilizing solid oxide electrolyzer cell (SOEC) systems widely. In SOEC stacks, separators are exposed to complexed dual atmosphere (i.e. hydrogen - steam mixed gases and oxygen rich air are on each side). In this study, the degradation phenomena of separator materials (SUS430, ZMG232G10, Crofer22APU) in SOEC dual atmosphere were investigated. The samples were exposed in SOEC dual and simple atmospheres at 700 °C for 500 h. Then, their cross sections were analyzed by X-ray diffraction and scanning electron microscopy/energy-dispersive X-ray analysis. The degradation mechanisms of the separator materials in the SOEC stack operating conditions were discussed. ZMG232G10 and Crofer22APU with high Cr content showed thin oxide layer under both the dual or single atmosphere, while SUS430 with low Cr content showed significant oxidation in the H2-steam atmosphere and on the air side under the dual atmosphere condition. The significant oxidation on the air side of the dual atmosphere of SUS430 observed in this study is a unique phenomenon under the dual atmosphere condition and not observed in a single air atmosphere.
{"title":"Accelerated High-Temperature Oxidation Behavior of Ferritic Stainless Steel under Air/H2+H2O Dual Atmosphere","authors":"Riko Inuzuka, Norikazu Osada, Kiyoshi Imai, Tsuneji Kameda, Tatsumi Ishihara","doi":"10.1149/1945-7111/ad6bc4","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6bc4","url":null,"abstract":"Improvement in durability is one of the important subjects for utilizing solid oxide electrolyzer cell (SOEC) systems widely. In SOEC stacks, separators are exposed to complexed dual atmosphere (i.e. hydrogen - steam mixed gases and oxygen rich air are on each side). In this study, the degradation phenomena of separator materials (SUS430, ZMG232G10, Crofer22APU) in SOEC dual atmosphere were investigated. The samples were exposed in SOEC dual and simple atmospheres at 700 °C for 500 h. Then, their cross sections were analyzed by X-ray diffraction and scanning electron microscopy/energy-dispersive X-ray analysis. The degradation mechanisms of the separator materials in the SOEC stack operating conditions were discussed. ZMG232G10 and Crofer22APU with high Cr content showed thin oxide layer under both the dual or single atmosphere, while SUS430 with low Cr content showed significant oxidation in the H2-steam atmosphere and on the air side under the dual atmosphere condition. The significant oxidation on the air side of the dual atmosphere of SUS430 observed in this study is a unique phenomenon under the dual atmosphere condition and not observed in a single air atmosphere.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"60 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1149/1945-7111/ad6eba
Qingliang Zhang, Ningsong Qu
Copper alloys, such as ZCuPb10Sn10, have been widely applied to friction pairs in various products. Surface texture, such as micro-dimple array has attracted significant attention from researchers worldwide to improve tribological performance. To generate micro-dimple array on ZCuPb10Sn10 alloy by electrochemical machining, it is essential to investigate the electrochemical dissolution behavior of ZCuPb10Sn10 in NaNO3 solution. In this paper, the electrochemical dissolution behavior of ZCuPb10Sn10 alloy in NaNO3 solution is investigated through experimental tests. Anodic polarization, Tafel polarization, and electrochemical impedance spectroscopy were conducted to investigate its passive and corrosion behavior. The microstructure and composition of the dissolved surfaces were analyzed under various conditions. Additionally, a model was proposed to explain the electrochemical dissolution process of ZCuPb10Sn10 alloy in NaNO3 solution under high pressure hydrostatic conditions. Ultimately, a NaNO3 solution with 10% in concentration and 20 °C in temperature was selected as the electrolyte and a micro-dimple array with an average diameter of 119.7 μm and a depth of 7.4 μm was successfully generated with through-mask electrochemical micromachining on the surface of ZCuPb10Sn10 alloy.
{"title":"Electrochemical Dissolution Behavior of ZCuPb10Sn10 Alloy in NaNO3 Solution","authors":"Qingliang Zhang, Ningsong Qu","doi":"10.1149/1945-7111/ad6eba","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6eba","url":null,"abstract":"Copper alloys, such as ZCuPb10Sn10, have been widely applied to friction pairs in various products. Surface texture, such as micro-dimple array has attracted significant attention from researchers worldwide to improve tribological performance. To generate micro-dimple array on ZCuPb10Sn10 alloy by electrochemical machining, it is essential to investigate the electrochemical dissolution behavior of ZCuPb10Sn10 in NaNO<sub>3</sub> solution. In this paper, the electrochemical dissolution behavior of ZCuPb10Sn10 alloy in NaNO<sub>3</sub> solution is investigated through experimental tests. Anodic polarization, Tafel polarization, and electrochemical impedance spectroscopy were conducted to investigate its passive and corrosion behavior. The microstructure and composition of the dissolved surfaces were analyzed under various conditions. Additionally, a model was proposed to explain the electrochemical dissolution process of ZCuPb10Sn10 alloy in NaNO<sub>3</sub> solution under high pressure hydrostatic conditions. Ultimately, a NaNO<sub>3</sub> solution with 10% in concentration and 20 °C in temperature was selected as the electrolyte and a micro-dimple array with an average diameter of 119.7 μm and a depth of 7.4 μm was successfully generated with through-mask electrochemical micromachining on the surface of ZCuPb10Sn10 alloy.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"176 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1149/1945-7111/ad6fd7
Monsuru Dauda, John Hendershot, Mustapha Bello, Junghyun Park, Alvaro Loaiza Orduz, Orhan Kizilkaya, Phillip Sprunger, Anthony Engler, Koffi Yao, Craig Plaisance, John Flake
In this study Cu, Sn, and bimetallic CuSnx nanoparticles were synthesized and evaluated as electrocatalysts for CO2 reduction using zero gap membrane electrode assemblies. Results show bimetallic electrocatalysts with Sn contents above 10% yield formate as a primary product with Faradaic Efficiencies near 70% at 350 mA cm−2. Cu-Snx electrocatalysts with less than 10% Sn yield CO at current densities below 350 mA cm−2 and relatively lower cell potentials. When the low-Sn content bimetallic electrocatalysts were evaluated in alkaline anolytes at 350 mA cm−2, ethanol was recorded as the primary product (FE = 48.5% at Ecell ≥ 3.0 V). We propose enhanced C2 activity and selectivity originate from Cu dimers adjacent to Sn atoms for bimetallic electrocatalyst with low-Sn content. The C2 active sites are lost when the surface Sn content exceeds 25%–38%.
本研究合成了铜、锡和双金属 CuSnx 纳米粒子，并将其作为使用零间隙膜电极组件进行二氧化碳还原的电催化剂进行了评估。结果表明，Sn 含量高于 10% 的双金属电催化剂在 350 mA cm-2 电流条件下，主要产物甲酸的法拉第效率接近 70%。锡含量低于 10%的铜锡双金属电催化剂在电流密度低于 350 mA cm-2 和电池电位相对较低的条件下产生 CO。在 350 mA cm-2 的碱性溶液中评估低锡含量的双金属电催化剂时，乙醇被记录为主要产物（Ecell ≥ 3.0 V 时 FE = 48.5%）。我们认为，C2 活性和选择性的增强源于低锡含量双金属电催化剂中与锡原子相邻的铜二聚体。当表面锡含量超过 25%-38% 时，C2 活性位点就会消失。
{"title":"Activity and Selectivity in the Electrochemical Reduction of CO2 at CuSnx Electrocatalysts Using a Zero-Gap Membrane Electrode Assembly","authors":"Monsuru Dauda, John Hendershot, Mustapha Bello, Junghyun Park, Alvaro Loaiza Orduz, Orhan Kizilkaya, Phillip Sprunger, Anthony Engler, Koffi Yao, Craig Plaisance, John Flake","doi":"10.1149/1945-7111/ad6fd7","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6fd7","url":null,"abstract":"In this study Cu, Sn, and bimetallic CuSn<sub>x</sub> nanoparticles were synthesized and evaluated as electrocatalysts for CO<sub>2</sub> reduction using zero gap membrane electrode assemblies. Results show bimetallic electrocatalysts with Sn contents above 10% yield formate as a primary product with Faradaic Efficiencies near 70% at 350 mA cm<sup>−2</sup>. Cu-Sn<sub>x</sub> electrocatalysts with less than 10% Sn yield CO at current densities below 350 mA cm<sup>−2</sup> and relatively lower cell potentials. When the low-Sn content bimetallic electrocatalysts were evaluated in alkaline anolytes at 350 mA cm<sup>−2</sup>, ethanol was recorded as the primary product (FE = 48.5% at E<sub>cell</sub> ≥ 3.0 V). We propose enhanced C<sub>2</sub> activity and selectivity originate from Cu dimers adjacent to Sn atoms for bimetallic electrocatalyst with low-Sn content. The C<sub>2</sub> active sites are lost when the surface Sn content exceeds 25%–38%.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"2 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To meet the industrial production needs for high-quality and precisely controllable structured high-end nickel foils, rare Earth compounds are added as additives in complex industrial electrolytes to improve the quality of the nickel deposition layer. This study investigates the effects of adding rare Earth compounds to the existing industrial production electrolytes (which already contain various organic and inorganic additives in a mixed acid solution) on the surface microstructure, cerium content, grain size, and crystal orientation of the nickel deposition layer. Using direct current electrodeposition, different concentrations of rare Earth compounds were added to the industrial electrolyte, and the cerium content, grain size, and crystal orientation were characterized. The results show that adding 0.8 g·l−1 CeCl3 accelerates the nucleation rate and shortens the nucleation relaxation time. The addition of rare Earth elements promotes multi-directional preferential growth, resulting in uniform and fine grain size, improved grain structure of the deposition layer, and reduced surface roughness of the nickel plating layer. Therefore, rare Earth elements can be used to regulate the structure, microstructure, and grain refinement of the nickel deposition layer without affecting its composition.
{"title":"The Effect of the Rare Earth Element Cerium on the Electrocrystallization and Microstructure of Nickel Electrodeposits in Industrial Electrolytes","authors":"Yang-Tao Xu, Yan-Hong Li, Yin Peng, Zhi-Qiang Zhong","doi":"10.1149/1945-7111/ad70da","DOIUrl":"https://doi.org/10.1149/1945-7111/ad70da","url":null,"abstract":"To meet the industrial production needs for high-quality and precisely controllable structured high-end nickel foils, rare Earth compounds are added as additives in complex industrial electrolytes to improve the quality of the nickel deposition layer. This study investigates the effects of adding rare Earth compounds to the existing industrial production electrolytes (which already contain various organic and inorganic additives in a mixed acid solution) on the surface microstructure, cerium content, grain size, and crystal orientation of the nickel deposition layer. Using direct current electrodeposition, different concentrations of rare Earth compounds were added to the industrial electrolyte, and the cerium content, grain size, and crystal orientation were characterized. The results show that adding 0.8 g·l<sup>−1</sup> CeCl<sub>3</sub> accelerates the nucleation rate and shortens the nucleation relaxation time. The addition of rare Earth elements promotes multi-directional preferential growth, resulting in uniform and fine grain size, improved grain structure of the deposition layer, and reduced surface roughness of the nickel plating layer. Therefore, rare Earth elements can be used to regulate the structure, microstructure, and grain refinement of the nickel deposition layer without affecting its composition.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"20 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-28DOI: 10.1149/1945-7111/ad6ef6
Si-Qi Jiao, Yu-Feng Liu, Xiao-Hong Zheng, Cheng Zhang, Xiao-Rui Wang
Compared to gas sensors based on single metal oxide, gas sensors based on binary metal oxide semiconductors (MOS) offer a rich variety of structural types and hold great potential for excellent selectivity. Inspired by this, we synthesized BiVO4 powder through a stepwise reaction combining calcination with hydrothermal bath and investigated the influence of different calcination temperatures on its gas sensitivity performance. Our study revealed that BiVO4-600 exhibited optimal TEA gas sensing behavior at 225 °C, showing high response values (Ra/Rg = 43.4) and fast response/recovery times (15 s/52 s). Additionally, the sensor displayed high stability, repeatability, and exceptional selectivity. Preliminary research indicates that calcination temperature induces changes in the oxygen vacancy content of BiVO4, thus affecting its sensing performance.
{"title":"Controlling Oxygen Vacancy Content by Varying Calcination Temperature to Enhance the Gas Sensing Performance of BiVO4 Material","authors":"Si-Qi Jiao, Yu-Feng Liu, Xiao-Hong Zheng, Cheng Zhang, Xiao-Rui Wang","doi":"10.1149/1945-7111/ad6ef6","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6ef6","url":null,"abstract":"Compared to gas sensors based on single metal oxide, gas sensors based on binary metal oxide semiconductors (MOS) offer a rich variety of structural types and hold great potential for excellent selectivity. Inspired by this, we synthesized BiVO<sub>4</sub> powder through a stepwise reaction combining calcination with hydrothermal bath and investigated the influence of different calcination temperatures on its gas sensitivity performance. Our study revealed that BiVO<sub>4</sub>-600 exhibited optimal TEA gas sensing behavior at 225 °C, showing high response values (R<sub>a</sub>/R<sub>g</sub> = 43.4) and fast response/recovery times (15 s/52 s). Additionally, the sensor displayed high stability, repeatability, and exceptional selectivity. Preliminary research indicates that calcination temperature induces changes in the oxygen vacancy content of BiVO<sub>4</sub>, thus affecting its sensing performance.<inline-formula>\u0000<inline-graphic xlink:href=\"jesad6ef6-ga.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"70 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, a 3D-prinited solution-flow type microdroplet cell (SF-MDC) is employed as a new technique for the fabrication of porous anodic aluminum oxide (AAO) layer using oxalic acid electrolyte on aluminum. The surface morphology of the porous AAO film was characterized by a scanning electron microscope. The aim of this study was to fabricate a through-hole porous alumina layer in a single step anodizing process and to investigate the influence of anodized voltages and scanning speeds on the thickness and pore structure of alumina layer. The results showed that the pore diameter and interpore distance were directly proportional to the anodizing voltage. The thicknesses of formed AAO films were found to be 35.5, 50.7, and 81.6 μm at scanning speeds of 10, 5, and 2.5 μms−1, respectively. Through-hole porous AAO was successfully fabricated at room temperature without chemical etching. The SF-MDC fabrication technique is proposed as an environmentally attractive and suitable process for the fabrication of porous AAO layers.
{"title":"Formation of Through-Hole Porous Anodic Aluminum Oxide Layer Locally with 3D Printed Solution Flow Type Microdroplet Cell","authors":"Adane Adugna Ayalew, Xiaole Han, Yoganandan Govindaraj, Masatoshi Sakairi","doi":"10.1149/1945-7111/ad6fd6","DOIUrl":"https://doi.org/10.1149/1945-7111/ad6fd6","url":null,"abstract":"In this study, a 3D-prinited solution-flow type microdroplet cell (SF-MDC) is employed as a new technique for the fabrication of porous anodic aluminum oxide (AAO) layer using oxalic acid electrolyte on aluminum. The surface morphology of the porous AAO film was characterized by a scanning electron microscope. The aim of this study was to fabricate a through-hole porous alumina layer in a single step anodizing process and to investigate the influence of anodized voltages and scanning speeds on the thickness and pore structure of alumina layer. The results showed that the pore diameter and interpore distance were directly proportional to the anodizing voltage. The thicknesses of formed AAO films were found to be 35.5, 50.7, and 81.6 μm at scanning speeds of 10, 5, and 2.5 μms<sup>−1</sup>, respectively. Through-hole porous AAO was successfully fabricated at room temperature without chemical etching. The SF-MDC fabrication technique is proposed as an environmentally attractive and suitable process for the fabrication of porous AAO layers.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"46 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lithium-air batteries (LABs) are gaining attention as a promising energy storage solution. Their theoretical energy density of 3,505 Whkg−1 exceeds that of conventional lithium-ion batteries (500–800 Whkg−1). The commercial viability and widespread adoption of lithium-air batteries face challenges such as poor cycling stability, limited lifespan, and unresolved side reactions. In this study, we synthesized spinel CoFe2O4-decorated on bio-based poly(2,5-benzimidazole) derived N-doped carbon for electrocatalysts. Notably, strong metal-substrate interaction (SMSI) was observed through various characterizations. The bifunctional electrocatalytic activity and stability toward oxygen reduction reaction and oxygen evolution reaction were significantly enhanced by the SMSI, The LAB demonstrated a high discharge capacity of 18,356 mAhg−1 at a current density of 200 mAg−1, maintaining a remarkable discharge capacity of 1,000 mAhg−1 even at a high current density of 400 mAg−1 for 200 cycles. CoFe2O4-decorated on bio-derived ABPBI holds promise as a practical air-breathing electrode for high-capacity rechargeable LABs.
{"title":"CoFe2O4 Nanoparticles on Bio-Based Polymer Derived Nitrogen Doped Carbon as Bifunctional Electrocatalyst for Li-Air Battery","authors":"Pirapath Arkasalerks, Amarshi Patra, Kottisa Sumala Patnaik, Koichi Higashimine, Noriyoshi Matsumi","doi":"10.1149/1945-7111/ad69c9","DOIUrl":"https://doi.org/10.1149/1945-7111/ad69c9","url":null,"abstract":"Lithium-air batteries (LABs) are gaining attention as a promising energy storage solution. Their theoretical energy density of 3,505 Whkg<sup>−1</sup> exceeds that of conventional lithium-ion batteries (500–800 Whkg<sup>−1</sup>). The commercial viability and widespread adoption of lithium-air batteries face challenges such as poor cycling stability, limited lifespan, and unresolved side reactions. In this study, we synthesized spinel CoFe<sub>2</sub>O<sub>4</sub>-decorated on bio-based poly(2,5-benzimidazole) derived N-doped carbon for electrocatalysts. Notably, strong metal-substrate interaction (SMSI) was observed through various characterizations. The bifunctional electrocatalytic activity and stability toward oxygen reduction reaction and oxygen evolution reaction were significantly enhanced by the SMSI, The LAB demonstrated a high discharge capacity of 18,356 mAhg<sup>−1</sup> at a current density of 200 mAg<sup>−1</sup>, maintaining a remarkable discharge capacity of 1,000 mAhg<sup>−1</sup> even at a high current density of 400 mAg<sup>−1</sup> for 200 cycles. CoFe<sub>2</sub>O<sub>4</sub>-decorated on bio-derived ABPBI holds promise as a practical air-breathing electrode for high-capacity rechargeable LABs.","PeriodicalId":17364,"journal":{"name":"Journal of The Electrochemical Society","volume":"23 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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