Electrochemistry Communications最新文献

{"title":"Highly enhanced electrocatalytic OER with facile electrodeposition of MIL–53(Fe)/NiAl–LDH/NF and NiAl–LDH/MIL–53(Fe)/NF","authors":"Afsaneh Ahmadi ,&nbsp;Mohammad Chahkandi ,&nbsp;Mahboobeh Zargazi ,&nbsp;Jin Suk Chung","doi":"10.1016/j.elecom.2024.107825","DOIUrl":"10.1016/j.elecom.2024.107825","url":null,"abstract":"<div><div>This research investigates a new approach to improve the electrocatalytic rate of the Oxygen Evolution Reaction (OER), a key step in water electrolysis. The study focuses on two promising materials: MIL–53(Fe) and NiAl–LDH. MIL–53(Fe) offers several advantages: high catalytic activity, large surface area, and good chemical stability. NiAl–LDH is attractive due to its layered structure, tolerance to a wide range of pH levels, scalability, and cost-effectiveness. However, their limitations like low conductivity and restricted accessibility of active sites hinder their performance in water splitting applications. To address these limitations, novel composite thin films were created using a technique called layer–by–layer (LBL) electrophoretic deposition. These films, built on nickel foam (NF) substrates, included two configurations: MIL–53(Fe)/NiAl–LDH/NF and NiAl–LDH/MIL–53(Fe)/NF. The MIL-53(Fe)/NiAl-LDH/NF composite exhibited remarkable OER activity in alkaline electrolytes, requiring overpotentials of only 200, 270, and 370 <em>mV</em> to reach current densities of 20, 50, and 100 mA <em>cm⁻²</em>, respectively. The Tafel slope of 54.86 <em>mVdec⁻¹</em> suggests rapid reaction kinetics. Additionally, it demonstrated excellent long-term stability, lasting for at least 20 h. The success of the MIL–53(Fe)/NiAl–LDH/NF composite can be attributed to the LBL technique. This method creates a composite with a larger surface area, significantly improving OER efficiency. In contrast, the MIL–53(Fe)/NiAl–LDH/NF configuration had the opposite effect. The NF pores became blocked by the MIL–53(Fe) layer, reducing the overall surface area, hindering electron transfer, and thereby limiting oxygen production. The LBL deposition method used in this study proves its effectiveness in designing efficient electrocatalysts. This opens up possibilities for creating other multicomponent materials for energy applications. The findings provide valuable insights for future research on these promising composite materials, potentially leading to the development of cost-effective and high-performance catalysts for various electrochemical applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107825"},"PeriodicalIF":4.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel and simple electrochemical sensing platform based on polypyrrole nanotubes/ZIF-67 nanocomposite/screen printed graphite electrode for sensitive determination of metronidazole","authors":"Somayeh Tajik ,&nbsp;Hadi Beitollahi ,&nbsp;Fariba Garkani Nejad","doi":"10.1016/j.elecom.2024.107824","DOIUrl":"10.1016/j.elecom.2024.107824","url":null,"abstract":"<div><div>Here, a simple, fast, and sensitive voltammetric sensor based on screen printed graphite electrode (SPGE) modified with polypyrrole nanotubes/zeolitic imidazolate framework-67 (PPy NTs/ZIF-67) nanocomposite is introduced for the metronidazole (MNZ) determination. The PPy NTs/ZIF-67 nanocomposite was synthesized and characterized by using X-ray diffraction (XRD) spectroscopy, field emission scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectroscopy (EDS) techniques. The developed sensor based on PPy NTs-ZIF-67 nanocomposite modified SPGE shows an obvious reduction peak at −650 mV for MNZ, mainly due to the synergistic effects of the ZIF-67 and PPy NTs. Differential pulse voltammetry (DPV) was found to be the most suitable method for MNZ detection, showing a linear dynamic range of 0.01–500.0 µM and a low limit of detection (LOD) of 0.004 µM. In investigating the practicability, the PPy NTs/ZIF-67/SPGE sensor demonstrated efficient practicability with satisfactory recoveries (97.1 % to 103.5 %) and low relative standard deviation (RSD) values of 1.8–3.6 % for MNZ determination in MNZ tablets and urine samples.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"169 ","pages":"Article 107824"},"PeriodicalIF":4.7,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring spirooxazine–merocyanine photoisomerization with ion-current rectifying quartz nanopipettes","authors":"Emer B. Farrell,&nbsp;Gareth Redmond,&nbsp;Robert P. Johnson","doi":"10.1016/j.elecom.2024.107820","DOIUrl":"10.1016/j.elecom.2024.107820","url":null,"abstract":"<div><div>The characterization and discrimination of chemical compounds is imperative in both academia and industry, but currently relies on expensive and/or bulky instrumentation. Herein, we demonstrate that the ion transport properties of bare quartz nanopipettes containing aprotic acetonitrile electrolyte can be used discriminate isomers based on polarization and solvation, through changes to interfacial solvent ordering at the nanopore wall. This is demonstrated by monitoring the photoinduced isomerization of spirooxazine to merocyanine using the ion-current rectification of a quartz-nanopipette containing acetonitrile electrolyte, which results in an increase in rectification ratio (RR) from 3.6 ± 0.3 to 5.1 ± 0.2. This change is comparable to traditional UV–Vis absorbance and fluorescence measurements of the same process, with the appearance of a small shoulder-like absorbance peak from 400 to 500 nm, and a strong fluorescence signal at 430 nm.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107820"},"PeriodicalIF":4.7,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applicability of microcapillary electrochemical droplet cell for monitoring microbiologically induced corrosion","authors":"Reece Goldsberry ,&nbsp;Ulises Martin ,&nbsp;Brooke Bond ,&nbsp;Evelyn Callaway ,&nbsp;Homero Castaneda ,&nbsp;Arul Jayaraman","doi":"10.1016/j.elecom.2024.107822","DOIUrl":"10.1016/j.elecom.2024.107822","url":null,"abstract":"<div><div>Formed biofilms can induce corrosion of metallic substrates through the secretion of corrosive chemical species, changes in local acidity, and the creation of galvanic oxygen concentration cells. Electrochemical testing is useful to study and monitor the growth of biofilms on metallic substrates. Macroelectrochemical testing gives an average measurement of all the chemical interactions and processes in the sampled area which is typically on the mm² to cm² scale. Microcapillary electrochemical droplet cell testing can perform AC and DC electrochemical measurements on the µm² scale, allowing measurements of local electrochemical processes in the picoampere range. Adapting this technique for use in studying microbiologically induced corrosion could provide high-resolution in-situ characterization of biofilm growth. Low alloy steel coupons were subjected to macro- and microelectrochemical techniques to characterize the influence of microbiological entities on the corrosion process.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107822"},"PeriodicalIF":4.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Halide adsorption influences snapback distance in Scanning Tunnelling Microscope break junctions","authors":"Chanyuan Huo ,&nbsp;Andrea Vezzoli ,&nbsp;Natasa Vasiljevic ,&nbsp;Walther Schwarzacher","doi":"10.1016/j.elecom.2024.107821","DOIUrl":"10.1016/j.elecom.2024.107821","url":null,"abstract":"<div><div>‘Snapback distance’ refers to the rapid increase in the size of the gap formed immediately after breaking an atomic-scale metallic contact. It is a commonly observed phenomenon in Scanning Tunnelling Microscope break junction (STM-BJ) and mechanically controlled break junction (MCBJ) experiments. Here, we show that the snapback distance measured for a gold break junction in pure water was significantly reduced in an electrolyte containing halide anions. In the case of Br⁻, experiments under electrochemical control provided clear evidence that this reduction was caused by halide adsorption on the surface of the gold.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107821"},"PeriodicalIF":4.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of SECM to detect a local electrolyte acidification due to the hydrogen flux desorption from a cathodic charged stainless steel","authors":"Malo Duportal,&nbsp;Dao Trinh,&nbsp;Catherine Savall,&nbsp;Xavier Feaugas,&nbsp;Abdelali Oudriss","doi":"10.1016/j.elecom.2024.107812","DOIUrl":"10.1016/j.elecom.2024.107812","url":null,"abstract":"<div><div>This work aims to estimate local pH variations of a hydrogen charged sample using Scanning ElectroChemical Microscopy (SECM). For that purpose, the microelectrode is polarized in the cathodic domain, where the proton reduction takes place. An initial calibration suggests that cathodic current of the platinum tip is sensitive to pH variations. Then, this system was applied near the surface of stainless steel previously charged with hydrogen. Coupling this result with the analysis of the uncharged samples at two different pH, it appears that hydrogen desorption induces a local acidification which could explain the increase in dissolution kinetics after hydrogen absorption, which has been reported in many studies.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107812"},"PeriodicalIF":4.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response characteristics of platinum coated titanium bipolar plates for proton exchange membrane water electrolysis under fluctuating conditions","authors":"Yingyu Ding,&nbsp;Xiejing Luo,&nbsp;Luqi Chang,&nbsp;Chaofang Dong","doi":"10.1016/j.elecom.2024.107819","DOIUrl":"10.1016/j.elecom.2024.107819","url":null,"abstract":"<div><div>Voltage fluctuations in energy input not only impact the overall hydrogen production efficiency and stability of Proton Exchange Membrane Water Electrolysis (PEMWE) systems but also pose significant challenges to the long-term service life of individual components. This study focuses on the key component − bipolar plates and investigates the response behavior of platinum-coated titanium bipolar plates under simulated fluctuating voltage conditions. By integrating surface phase analysis and electrochemical testing results, this research elucidates the response characteristics of the bipolar plates to different voltage waveforms and frequencies. And the findings hold substantial significance for the upstream energy control in hydrogen production through water electrolysis.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107819"},"PeriodicalIF":4.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molten Salt Assisted Assembly (MASA) of novel mesoporous Ni0.5Mn0.5Co2O4 for high-performance asymmetric supercapacitors","authors":"Mert Umut Özkaynak ,&nbsp;Yurdanur Türker ,&nbsp;Koray Bahadır Dönmez ,&nbsp;Selin Dağlar ,&nbsp;Zehra Çobandede ,&nbsp;Merve Metin Çelenk ,&nbsp;Nilgün Karatepe ,&nbsp;F. Seniha Güner ,&nbsp;Ömer Dag","doi":"10.1016/j.elecom.2024.107811","DOIUrl":"10.1016/j.elecom.2024.107811","url":null,"abstract":"<div><div>Mesoporous transition metal oxides (TMO) are immensely investigated as electrode materials in supercapacitors. The molten salt assisted self-assembly (MASA) process enables a facile route for the synthesis of the mesoporous TMO. In this study, mesoporous nickel manganese cobaltite (Ni_0.5Mn_0.5Co₂O₄) is synthesized for the first time using a MASA process and is evaluated as a novel electrode-active material for asymmetric supercapacitors. The objective of this work is to quantitatively measure the performance improvement in the Ni_0.5Mn_0.5Co₂O₄ electrode based on its composition and reveal the improvement mechanism through electrochemical methods. The electrochemical performance of the NiCo₂O₄ and MnCo₂O₄ prepared by MASA is also investigated, in order to understand the synergistic effect of Ni and Mn elements in the same cobaltite structure. In line with the data obtained from half cells, a full asymmetric cell is prepared by assembling the appropriate amount of Ni_0.5Mn_0.5Co₂O₄ and activated carbon through the charge balance theory. The test results show that the specific capacitance <em>C</em>_<em>A</em> (<em>C_s</em>) values are 2.62F/cm² (92.1F/g) for mesoporous NiCo₂O₄, 0.26F/cm² (9.8F/g) for mesoporous MnCo₂O₄, and 9.53F/cm² (338.5F/g) for mesoporous Ni_0.5Mn_0.5Co₂O₄ under the test conditions of 5 mA/cm². The asymmetric supercapacitor assembled with Ni_0.5Mn_0.5Co₂O₄ and activated carbon demonstrates a superior energy density of 79.52 Wh/kg at 1 mA/cm². The findings of the study highlight the importance of substituting the electrode with Ni_0.5Mn_0.5Co₂O₄ to enhance the <em>C</em>_<em>A</em> (<em>C_s</em>) by achieving proper surface properties and electrochemical activity.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107811"},"PeriodicalIF":4.7,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1388248124001541/pdfft?md5=7d0f6600dfce9f4681f7e6cf1fbf7f9e&pid=1-s2.0-S1388248124001541-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D Co-doped carbon nanosheets as high-performance electrodes for Li-S batteries","authors":"Tao Chen ,&nbsp;Man Li ,&nbsp;Joonho Bae","doi":"10.1016/j.elecom.2024.107810","DOIUrl":"10.1016/j.elecom.2024.107810","url":null,"abstract":"<div><div>3D petal-shaped Cobalt-doped carbon nanosheets (PCoCNS) were synthesized as excellent sulfur hosts for lithium-sulfur (Li-S) batteries. Co doping enhanced the affinity of the carbon surface for lithium polysulfides (LiPSs), inhibiting the shuttle effect. The electrocatalytic effect of the PCoCNS electrode exhibited enhanced polysulfide conversion kinetics, thereby promoting Li₂S formation. Owing to the above advantages, the PCoCNS cathode exhibited satisfactory reversibility of 841 mAh/g with a high capacity retention of 91 %. Additionally, it displayed high coulombic efficiency (CE) values exceeding 97 % over 100 cycles at a current rate of 0.5C. Furthermore, the electrode demonstrated low polarization and exhibited an excellent rate performance, delivering a capacity of 575 mAh/g at the high rate of 3C. This study synthesized a promising sulfur cathode for enhancing the electrochemical performance of Li-S batteries.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"168 ","pages":"Article 107810"},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Facile and innovation synthesis of Zn-Mn-Co-LDH/polypyrrole and its application in investigating ethanol oxidation in an alkaline medium","authors":"Elhameh Saeb ,&nbsp;Karim Asadpour-Zeynali ,&nbsp;Hossein Dastangoo","doi":"10.1016/j.elecom.2024.107809","DOIUrl":"10.1016/j.elecom.2024.107809","url":null,"abstract":"<div><p>Overvoltage and low current are observed for ethanol electrooxidation on the surface of many unmodified electrodes. Therefore, it is desirable to use a suitable catalyst for ethanol electrooxidation to increase the current. This research introduces a new sensor to catalyze ethanol oxidation in an alkaline environment. This new Zn-Mn-Co LDH/PolyPyrrole/GCE nanocomposite sensor exhibits high catalytic activity for ethanol electrooxidation. It changes the oxidation potential of ethanol to a less positive potential. To identify this proposed sensor, X-ray diffraction (XRD), Brauner Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), FT-IR spectroscopy, field emission scanning electron microscopy (FESEM), thermal analysis (TGA), high-resolution transmission electron microscopy (HR-TEM) and cyclic voltammetry techniques were used. Ethanol electrooxidation was investigated by cyclic voltammetry technique. The effects of scan rate and ethanol concentration on the ethanol oxidation peak have been investigated. The proposed sensor showed long-term stability. This prepared nanocomposite can be used as an anode catalyst for ethanol fuel cells.</p></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"167 ","pages":"Article 107809"},"PeriodicalIF":4.7,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1388248124001528/pdfft?md5=10b6a4972bf9062b9735680a83421d36&pid=1-s2.0-S1388248124001528-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142244174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}