Pub Date : 2025-01-27DOI: 10.1016/j.elecom.2025.107880
Axel Marth , Julia Piehler , Matthew Brodt , Maximilian Maier , Simon Thiele
Electrochemical energy storage in organic compounds has gained increasing interest recently. In particular, ketones and their secondary alcohols can serve as an electrochemical liquid organic hydrogen carrier (EC-LOHC) due to the possibility of selective oxidation of the hydrogen-rich counterpart. This study examines the possibility of hydrogenating ketones (acetone, 2-butanone, 2-pentanone) in alkaline media (KOH) and shows the influence of aliphatic side-chain length on the surface coverage of the polycrystalline platinum catalyst in an H-cell. This is done by performing linear sweep voltammetry (LSV) and cyclovoltammetry (CV). LSVs reveal similar onset potentials for the ketone reduction reaction, and the influence of onsetting hydrogen evolution reaction and its dependency on surface coverage in the voltage range below 0 V vs. RHE. Furthermore, it reports increased faradaic efficiency (FE) in alkaline media in comparison to acidic media.
{"title":"Investigation of the Electrocatalytic reduction of simple ketones in alkaline media","authors":"Axel Marth , Julia Piehler , Matthew Brodt , Maximilian Maier , Simon Thiele","doi":"10.1016/j.elecom.2025.107880","DOIUrl":"10.1016/j.elecom.2025.107880","url":null,"abstract":"<div><div>Electrochemical energy storage in organic compounds has gained increasing interest recently. In particular, ketones and their secondary alcohols can serve as an electrochemical liquid organic hydrogen carrier (EC-LOHC) due to the possibility of selective oxidation of the hydrogen-rich counterpart. This study examines the possibility of hydrogenating ketones (acetone, 2-butanone, 2-pentanone) in alkaline media (KOH) and shows the influence of aliphatic side-chain length on the surface coverage of the polycrystalline platinum catalyst in an H-cell. This is done by performing linear sweep voltammetry (LSV) and cyclovoltammetry (CV). LSVs reveal similar onset potentials for the ketone reduction reaction, and the influence of onsetting hydrogen evolution reaction and its dependency on surface coverage in the voltage range below 0 V vs. RHE. Furthermore, it reports increased faradaic efficiency (FE) in alkaline media in comparison to acidic media.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107880"},"PeriodicalIF":4.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102658","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}
Pub Date : 2025-01-25DOI: 10.1016/j.elecom.2025.107882
Shin-Jeong Lee , Jeong-Hee Choi , Insung Hwang , Myung-Hyun Ryu , Kyu-Nam Jung , Hyeon-geun Cho , Je In Lee , Gumjae Park
The lifespan of aqueous zinc-ion batteries, which are promising alternatives to Li-ion batteries, is affected by the irreversibility of Zn anodes, primarily caused by Zn dendrite growth and side reactions such as hydrogen evolution and corrosion during cycling. This study introduces a strategy to regulate zinc ion flux between the Zn anode and aqueous electrolyte by coating boron nitride (BN) onto a cellulose separator using a simple doctor blade method. The resulting BN@cellulose separator effectively suppresses Zn dendrite growth and minimizes side reactions in aqueous electrolytes. Electrochemical evaluations demonstrate that the BN coating reduces interfacial corrosion and enhances electrochemical stability compared to a bare cellulose separator by regulating the zinc ion flux between the electrolyte and active Zn sites. Overall, use of the BN@cellulose separator improved the electrochemical performance and prolonged cycling stability. The proposed strategy marks a significant advancement toward enhancing the long-term reliability of aqueous zinc-ion batteries.
{"title":"Interfacial engineering with BN@cellulose separator to suppress dendrite growth and side reactions in aqueous zinc-ion batteries","authors":"Shin-Jeong Lee , Jeong-Hee Choi , Insung Hwang , Myung-Hyun Ryu , Kyu-Nam Jung , Hyeon-geun Cho , Je In Lee , Gumjae Park","doi":"10.1016/j.elecom.2025.107882","DOIUrl":"10.1016/j.elecom.2025.107882","url":null,"abstract":"<div><div>The lifespan of aqueous zinc-ion batteries, which are promising alternatives to Li-ion batteries, is affected by the irreversibility of Zn anodes, primarily caused by Zn dendrite growth and side reactions such as hydrogen evolution and corrosion during cycling. This study introduces a strategy to regulate zinc ion flux between the Zn anode and aqueous electrolyte by coating boron nitride (BN) onto a cellulose separator using a simple doctor blade method. The resulting BN@cellulose separator effectively suppresses Zn dendrite growth and minimizes side reactions in aqueous electrolytes. Electrochemical evaluations demonstrate that the BN coating reduces interfacial corrosion and enhances electrochemical stability compared to a bare cellulose separator by regulating the zinc ion flux between the electrolyte and active Zn sites. Overall, use of the BN@cellulose separator improved the electrochemical performance and prolonged cycling stability. The proposed strategy marks a significant advancement toward enhancing the long-term reliability of aqueous zinc-ion batteries.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107882"},"PeriodicalIF":4.7,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098122","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}
Pub Date : 2025-01-24DOI: 10.1016/j.elecom.2025.107879
Christian Iffelsberger , Katarina A. Novčić , Eva Kolíbalová , Frank-Michael Matysik , Martin Pumera
High-entropy alloys (HEAs) offer unprecedented catalytic properties over single-composition nanoparticles or single atom engineered materials. Traditionally, the Hume–Rothery rule suggests that only size-and-structure similar elements can be mixed in conventional alloying, which limits the possible combinations of alloying elements. Here we propose an electrochemical approach as an innovative and alternative synthetic method for preparation of HEAs. Upon an electric arch by applying voltage drop of about 2 MV/m with high current densities and using ultra-thin Pt wire in glass, whose movement, in the aqueous solution containing the salt of the elements to be incorporated to the HEAs, is controlled by the scanning electrochemical microscope (SECM), the HEAs, consisting of doped silica nanobeads are produced. The composition of such HEAs depends on the materials and solution used in their preparation and thus it contains Pt, Si, Al, Ca, K, Cl, Mn, Zn, Na, N, Mo, and S. This new approach is compatible with ambient air and aqueous solution processes and is not limited by material selection, presenting a significant advancement in the synthesis of functional nanomaterials. The findings underline the potential of these high-entropy nanostructured materials in advancing the efficiency of industrial processes, particularly in the realm of green hydrogen production through water splitting. This simple, low-voltage, room temperature process is suitable for fabrication of HEAs of various composition and has the applicability to wide spectra of catalytic reactions.
{"title":"High-entropy alloys: Electrochemical Nanoarchitectonics toward high-performance Water splitting","authors":"Christian Iffelsberger , Katarina A. Novčić , Eva Kolíbalová , Frank-Michael Matysik , Martin Pumera","doi":"10.1016/j.elecom.2025.107879","DOIUrl":"10.1016/j.elecom.2025.107879","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) offer unprecedented catalytic properties over single-composition nanoparticles or single atom engineered materials. Traditionally, the Hume–Rothery rule suggests that only size-and-structure similar elements can be mixed in conventional alloying, which limits the possible combinations of alloying elements. Here we propose an electrochemical approach as an innovative and alternative synthetic method for preparation of HEAs. Upon an electric arch by applying voltage drop of about 2 MV/m with high current densities and using ultra-thin Pt wire in glass, whose movement, in the aqueous solution containing the salt of the elements to be incorporated to the HEAs, is controlled by the scanning electrochemical microscope (SECM), the HEAs, consisting of doped silica nanobeads are produced. The composition of such HEAs depends on the materials and solution used in their preparation and thus it contains Pt, Si, Al, Ca, K, Cl, Mn, Zn, Na, N, Mo, and S. This new approach is compatible with ambient air and aqueous solution processes and is not limited by material selection, presenting a significant advancement in the synthesis of functional nanomaterials. The findings underline the potential of these high-entropy nanostructured materials in advancing the efficiency of industrial processes, particularly in the realm of green hydrogen production through water splitting. This simple, low-voltage, room temperature process is suitable for fabrication of HEAs of various composition and has the applicability to wide spectra of catalytic reactions.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"173 ","pages":"Article 107879"},"PeriodicalIF":4.7,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136373","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}
Pub Date : 2025-01-22DOI: 10.1016/j.elecom.2025.107873
Jan Mikeš, Stanislav Pekárek, Ondřej Hanuš
We studied ozone generation of a surface dielectric discharge in an annular space of the cylindrical discharge chamber with tangential air input and four axial outputs. To enhance this generation, we focused on the combined effect of electric field distribution and streamline’s orientation concerning the active electrode by adjusting its geometry to a particular airflow. The aluminium active electrode consisted of rings, inclined rings, and axial strips. We used two types of this electrode, differing in the number of rings. We showed that for certain active electrode geometry and airflow, the concentration of generated ozone, production rate, and the ozone production yield exhibit a local maximum. This effect can be used to select the most efficient working regime for commercial ozone generators.
{"title":"Combined effects of electrode geometry and airflow streamlines patterns on ozone production of a cylindrical dielectric barrier discharge","authors":"Jan Mikeš, Stanislav Pekárek, Ondřej Hanuš","doi":"10.1016/j.elecom.2025.107873","DOIUrl":"10.1016/j.elecom.2025.107873","url":null,"abstract":"<div><div>We studied ozone generation of a surface dielectric discharge in an annular space of the cylindrical discharge chamber with tangential air input and four axial outputs. To enhance this generation, we focused on the combined effect of electric field distribution and streamline’s orientation concerning the active electrode by adjusting its geometry to a particular airflow. The aluminium active electrode consisted of rings, inclined rings, and axial strips. We used two types of this electrode, differing in the number of rings. We showed that for certain active electrode geometry and airflow, the concentration of generated ozone, production rate, and the ozone production yield exhibit a local maximum. This effect can be used to select the most efficient working regime for commercial ozone generators.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107873"},"PeriodicalIF":4.7,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102659","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}
Pub Date : 2025-01-22DOI: 10.1016/j.elecom.2025.107878
K. Goharshadi , S.M. Masoudpanah , H. Nasrinpour , M. Namayandeh Jorabchi
The Ba-doped NCM 811 cathode material (BaxLi1-xNi0.8Co0.1Mn0.1O2 (x = 0, 0.015, 0.03, 0.05)) was prepared by a facile chemical synthesis method. The structural, microstructural, and electrochemical properties were studied as a function of Ba content by X-ray diffractometry, X-ray photoelectron spectroscopy, scanning electron microscopy, galvanic charge/discharge, and electrochemical impedance spectroscopy (EIS) techniques. Single-phase NCM powders with the layered crystal structure were crystallized irrespective of the amount of Ba dopant. The unit cell volume expanded from 100.606 to 101.962 Å3 by adding the Ba cations. Furthermore, the particle size increased from 0.40 to 0.49 μm by increasing the Ba dopant up to 5 %. The Ba0.03Li0.97Ni0.8Co0.1Mn0.1O2 material had the highest discharge specific capacity of 185 mA h g‐1 at a current rate of 0.1C and a high capacity retention of 99.8 % after 500 charge/discharge cycling at 1C. By adding the Ba cations, the diffusion coefficient calculated from EIS increased from 3.31 × 10−14 to 7.71 × 10−14 cm2 s−1 due to the expansion of the lattice structure.
{"title":"Effects of Ba dopant on the structural, microstructural, and electrochemical properties of NCM811 cathode material (BaxLi1−xNi0.8Co0.1Mn0.1O2) for Li-ion storage","authors":"K. Goharshadi , S.M. Masoudpanah , H. Nasrinpour , M. Namayandeh Jorabchi","doi":"10.1016/j.elecom.2025.107878","DOIUrl":"10.1016/j.elecom.2025.107878","url":null,"abstract":"<div><div>The Ba-doped NCM 811 cathode material (Ba<sub>x</sub>Li<sub>1-x</sub>Ni<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (x = 0, 0.015, 0.03, 0.05)) was prepared by a facile chemical synthesis method. The structural, microstructural, and electrochemical properties were studied as a function of Ba content by X-ray diffractometry, X-ray photoelectron spectroscopy, scanning electron microscopy, galvanic charge/discharge, and electrochemical impedance spectroscopy (EIS) techniques. Single-phase NCM powders with the layered crystal structure were crystallized irrespective of the amount of Ba dopant. The unit cell volume expanded from 100.606 to 101.962 Å<sup>3</sup> by adding the Ba cations. Furthermore, the particle size increased from 0.40 to 0.49 μm by increasing the Ba dopant up to 5 %. The Ba<sub>0.03</sub>Li<sub>0.97</sub>Ni<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> material had the highest discharge specific capacity of 185 mA h g<sup>‐1</sup> at a current rate of 0.1C and a high capacity retention of 99.8 % after 500 charge/discharge cycling at 1C. By adding the Ba cations, the diffusion coefficient calculated from EIS increased from 3.31 × 10<sup>−14</sup> to 7.71 × 10<sup>−14</sup> cm<sup>2</sup> s<sup>−1</sup> due to the expansion of the lattice structure.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107878"},"PeriodicalIF":4.7,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098120","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}
Pub Date : 2025-01-20DOI: 10.1016/j.elecom.2025.107874
Ghobad Behzadi Pour , Leila Fekri Aval
Novel material innovation is a driving force for advancing high-performance electrochemical energy storage technologies. Quantum dots (QDs), over the last decade, have exhibited immense potential in applications related to bioimaging, optoelectronics, catalysis, and energy storage, together with a remarkable rise in greener synthesis methods. Carbon nanomaterials, particularly carbon quantum dots (CQDs) and graphene quantum dots (GQDs), have garnered significant interest due to their exceptional characteristics, including high electrical conductivity, thermal stability, mechanical robustness, chemical durability, photoluminescence, affordability, and ease of surface modification. CQDs show promise for supercapacitors due to their unique properties but face challenges like limited surface area. Improving CQD synthesis and purification is crucial for enhancing supercapacitor performance. GQDs are praised for their conductive networks and surface properties, but more research is needed on industrial-scale synthesis. This review reported the recent advances in the electrochemical characteristics and synthesis of various QDs in supercapacitor electrodes.
{"title":"Comparative studies of recent advances in quantum dots nanocomposites for supercapacitor electrodes","authors":"Ghobad Behzadi Pour , Leila Fekri Aval","doi":"10.1016/j.elecom.2025.107874","DOIUrl":"10.1016/j.elecom.2025.107874","url":null,"abstract":"<div><div>Novel material innovation is a driving force for advancing high-performance electrochemical energy storage technologies. Quantum dots (QDs), over the last decade, have exhibited immense potential in applications related to bioimaging, optoelectronics, catalysis, and energy storage, together with a remarkable rise in greener synthesis methods. Carbon nanomaterials, particularly carbon quantum dots (CQDs) and graphene quantum dots (GQDs), have garnered significant interest due to their exceptional characteristics, including high electrical conductivity, thermal stability, mechanical robustness, chemical durability, photoluminescence, affordability, and ease of surface modification. CQDs show promise for supercapacitors due to their unique properties but face challenges like limited surface area. Improving CQD synthesis and purification is crucial for enhancing supercapacitor performance. GQDs are praised for their conductive networks and surface properties, but more research is needed on industrial-scale synthesis. This review reported the recent advances in the electrochemical characteristics and synthesis of various QDs in supercapacitor electrodes.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107874"},"PeriodicalIF":4.7,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102660","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}
Pub Date : 2025-01-01DOI: 10.1016/j.elecom.2024.107848
Balamurugan Thangavel , Won Han , Joong Ho Shin
An electrochemical potential-assisted functionalization strategy is used to immobilize resazurin (AZ) on multiwalled carbon nanotube surfaces in a physiological buffer leading to the formation of a resorufin/dihydro resorufin (RR/DRR) redox couple. The electrochemical characterizations that reveal the modified surface are surface-confined behavior with an electron transfer rate constant of 4.4 s−1. Thus modified RR/DRR redox couple was found to modulate the interfacial characteristics to the benefits of bio-electrocatalysis since the redox molecule has sensitivity to pH, negative redox potential, and selectivity to analytes. The hydrogen peroxide (H2O2) reduction and sensing performance of the AZ-modified electrode surface were evaluated. The experimental results revealed the direct detection of high concentrations of H2O2 at the electrified interface before the oxygen reduction potential. Furthermore, the designed sensor exhibited high selectivity for H2O2 even in the presence of interfering molecules in the solution. In addition, for the demonstration, the glucose oxidase enzymes were immobilized on carbon nanotubes modified with an RR/DRR redox couple, and the electron tunneling behavior was investigated. The developed sensor could be used for the reagent-less electrochemical biosensing of glucose up to 30 mM. Thus, the AZ-based redox electrode catalysts can be applied in diverse biosensor applications.
{"title":"Electrochemical modification and analytical exploration of resazurin as a redox-active probe for electrochemical biosensors","authors":"Balamurugan Thangavel , Won Han , Joong Ho Shin","doi":"10.1016/j.elecom.2024.107848","DOIUrl":"10.1016/j.elecom.2024.107848","url":null,"abstract":"<div><div>An electrochemical potential-assisted functionalization strategy is used to immobilize resazurin (AZ) on multiwalled carbon nanotube surfaces in a physiological buffer leading to the formation of a resorufin/dihydro resorufin (RR/DRR) redox couple. The electrochemical characterizations that reveal the modified surface are surface-confined behavior with an electron transfer rate constant of 4.4 s<sup>−1</sup>. Thus modified RR/DRR redox couple was found to modulate the interfacial characteristics to the benefits of bio-electrocatalysis since the redox molecule has sensitivity to pH, negative redox potential, and selectivity to analytes. The hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) reduction and sensing performance of the AZ-modified electrode surface were evaluated. The experimental results revealed the direct detection of high concentrations of H<sub>2</sub>O<sub>2</sub> at the electrified interface before the oxygen reduction potential. Furthermore, the designed sensor exhibited high selectivity for H<sub>2</sub>O<sub>2</sub> even in the presence of interfering molecules in the solution. In addition, for the demonstration, the <em>glucose oxidase</em> enzymes were immobilized on carbon nanotubes modified with an RR/DRR redox couple, and the electron tunneling behavior was investigated. The developed sensor could be used for the reagent-less electrochemical biosensing of glucose up to 30 mM. Thus, the AZ-based redox electrode catalysts can be applied in diverse biosensor applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107848"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133003","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}
Pub Date : 2025-01-01DOI: 10.1016/j.elecom.2024.107850
Guang-Ling Song , Xinran Yao
An electro-isolation method was developed to address the stubborn issue of galvanic effect. This new technique is utterly different from any traditional corrosion-prevention methods in engineering. It simply applies a current to isolate the galvanic current, and thus it does not need to have a coating to cover the galvanic couple surface, to physically cut off the electronic path, or to insert an insulating separator (or spacer) to lengthen the ionic path. This paper comprehensively illustrates the unique principle of the isolation method, and reports on the experimental results showing that the electro-isolation did effectively retard the galvanic currents of various galvanic couples in different conditions, including the severe galvanic corrosion of Mg/steel couple in salt spray. The electro-isolation does not need a direct electronic connection with the galvanic corrosion system, and there is no risk of over-protection compared with the traditional cathodic protection. The innovative principle of the electro-isolation may trigger studies on micro and macro measurements and controls in other fields in future.
{"title":"Electro-isolation of galvanic current","authors":"Guang-Ling Song , Xinran Yao","doi":"10.1016/j.elecom.2024.107850","DOIUrl":"10.1016/j.elecom.2024.107850","url":null,"abstract":"<div><div>An electro-isolation method was developed to address the stubborn issue of galvanic effect. This new technique is utterly different from any traditional corrosion-prevention methods in engineering. It simply applies a current to isolate the galvanic current, and thus it does not need to have a coating to cover the galvanic couple surface, to physically cut off the electronic path, or to insert an insulating separator (or spacer) to lengthen the ionic path. This paper comprehensively illustrates the unique principle of the isolation method, and reports on the experimental results showing that the electro-isolation did effectively retard the galvanic currents of various galvanic couples in different conditions, including the severe galvanic corrosion of Mg/steel couple in salt spray. The electro-isolation does not need a direct electronic connection with the galvanic corrosion system, and there is no risk of over-protection compared with the traditional cathodic protection. The innovative principle of the electro-isolation may trigger studies on micro and macro measurements and controls in other fields in future.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107850"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133334","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}
Pub Date : 2025-01-01DOI: 10.1016/j.elecom.2024.107854
Katharina Röhring, Falk Harnisch
Knowledge on reaction kinetics is essential for further understanding electrochemical reactions and the development of electrochemical processes. Different tools are available to study reaction kinetics of redox electrodes. One that is widely used is the rotating disk electrode (RDE). However, RDE has limitations when it comes to more complex electrochemical reactions, especially those involving gas evolution. Due to the facing downwards of the planar electrode surface evolving gas bubbles cannot escape by buoyance leading to temporarily and stochastically insultation. This limits using the RDE to low overpotentials or high rotation rates for these kind of reactions in order to prevent blockage of the electrode surface with gas bubbles. To overcome these limitations, we present a modification for commercially available RDE that is based on rapid prototyping using 3D-printing. This allows the RDE setup to be easily operated in a tilted position allowing the gas bubbles to escape from the electrode surface by buoyance. We validate the tilted RDE setup using the example of the well-studied redox pair ferro-/ferricyanide. This is achieved by calculating the diffusion coefficient for both redox species in straight and tilted position based on the Levich-equation. We show that the presented setup can be further used for more complex reactions.
{"title":"3D-printed add-on allows using commercially available rotating disc electrodes in tilted position","authors":"Katharina Röhring, Falk Harnisch","doi":"10.1016/j.elecom.2024.107854","DOIUrl":"10.1016/j.elecom.2024.107854","url":null,"abstract":"<div><div>Knowledge on reaction kinetics is essential for further understanding electrochemical reactions and the development of electrochemical processes. Different tools are available to study reaction kinetics of redox electrodes. One that is widely used is the rotating disk electrode (RDE). However, RDE has limitations when it comes to more complex electrochemical reactions, especially those involving gas evolution. Due to the facing downwards of the planar electrode surface evolving gas bubbles cannot escape by buoyance leading to temporarily and stochastically insultation. This limits using the RDE to low overpotentials or high rotation rates for these kind of reactions in order to prevent blockage of the electrode surface with gas bubbles. To overcome these limitations, we present a modification for commercially available RDE that is based on rapid prototyping using 3D-printing. This allows the RDE setup to be easily operated in a tilted position allowing the gas bubbles to escape from the electrode surface by buoyance. We validate the tilted RDE setup using the example of the well-studied redox pair ferro-/ferricyanide. This is achieved by calculating the diffusion coefficient for both redox species in straight and tilted position based on the Levich-equation. We show that the presented setup can be further used for more complex reactions.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107854"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133345","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}
Pub Date : 2025-01-01DOI: 10.1016/j.elecom.2024.107851
Eon-ju Park , Chiho Kim , Jooyoung Lee , Shin-Woo Myeong , Hoseok Lee , Sungjun Heo , Song Jin , Minjeong Park , Oi Lun Li , Sung Mook Choi
In response to the escalating global energy crisis and climate change, green hydrogen is increasingly recognized as a clean energy solution. This study presents an innovative approach to enhance the performance of nickel-based catalysts for anion exchange membrane water electrolysis (AEMWE) through careful selection of precursor materials and pH optimization in the co-precipitation process. By optimizing precursor types and pH conditions during co-precipitation synthesis, we achieved high yields of Ni(OH)2, which were then thermally treated to form NiO. Notably, the nitrate-based NiO (N-NiO) exhibited superior catalytic activity and durability, attributed to its favorable microstructure and charge transfer capabilities. In addition, to verify universality of the N-NiO study and to assess the water electrolysis performance, we synthesized a binary compound, nickel–cobalt oxide (NCO), by incorporating Co, and evaluated its electrochemical performance in an AEMWE single-cell system. The nitrate-based NCO-based single-cell achieved a high current density of 1.38 A/cm2 at 1.8 Vcell in 1 M KOH at 50 °C, with a low degradation rate of 23 mV/kh at 1 A/cm2 for 300 h. These findings provide valuable insights into the optimization of catalyst properties for hydrogen production and highlight significant commercial potential for hydrogen production and other electrochemical applications.
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