Journal of Electroanalytical Chemistry最新文献

英文中文

Spherical bismuth iron oxide nanostructures as battery-type negative electrode for supercapacitor applications

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118869

J. Johnson William , I. Manohara Babu , G. Muralidharan

Extensive research is needed in the field of energy storage devices in the development of electrochemically well performing negative electrodes. Herein, bismuth ferrite nanostructures were prepared through a green chemistry route using microwave irradiation technique. The X-ray diffraction analysis confirms that the prepared bismuth iron oxide nanostructures are comprised of perovskite BiFeO₃ and mullite Bi₂Fe₄O₉. The chemical environment around Bi, Fe and O element is examined using X-ray photoelectron spectroscopy. The structural characteristics of the bismuth iron oxide nanostructures were diagnosed using transmission electron microscopy, confirming the formation of nano-sized spherical particles. Half-cell mode was employed to study the charge storage characteristics of the prepared materials. The cyclic voltammetry and galvanostatic charge–discharge test on the electrodes of the prepared materials implies that the electrochemical performance is controlled by the quasi-conversion reaction mechanism and it could yield a maximum specific capacity of 445 C/g at a constant current density of 2 mA cm⁻². A battery-type asymmetric supercapacitor cell was devised using ternary Ni-Ce-Ag-O metal oxide nanocomposites as the counter electrode to the bismuth iron oxide nanostructures. The charge storage performance of the fabricated was assessed within the operating voltage of 1.5 V and it could yield a maximum energy density of 65 W h kg⁻¹ at a power density of 214 W kg⁻¹. Moreover, the charged cell could power up an array of 60 Red LEDs, signifying the potentiality of the prepared electrodes. The findings of the present study strongly support that the bismuth iron oxide nanostructures can be a suitable material for the fabrication of a battery-type negative electrode for asymmetric supercapacitor applications.

{"title":"Spherical bismuth iron oxide nanostructures as battery-type negative electrode for supercapacitor applications","authors":"J. Johnson William , I. Manohara Babu , G. Muralidharan","doi":"10.1016/j.jelechem.2024.118869","DOIUrl":"10.1016/j.jelechem.2024.118869","url":null,"abstract":"<div><div>Extensive research is needed in the field of energy storage devices in the development of electrochemically well performing negative electrodes. Herein, bismuth ferrite nanostructures were prepared through a green chemistry route using microwave irradiation technique. The X-ray diffraction analysis confirms that the prepared bismuth iron oxide nanostructures are comprised of perovskite BiFeO<sub>3</sub> and mullite Bi<sub>2</sub>Fe<sub>4</sub>O<sub>9</sub>. The chemical environment around Bi, Fe and O element is examined using X-ray photoelectron spectroscopy. The structural characteristics of the bismuth iron oxide nanostructures were diagnosed using transmission electron microscopy, confirming the formation of nano-sized spherical particles. Half-cell mode was employed to study the charge storage characteristics of the prepared materials. The cyclic voltammetry and galvanostatic charge–discharge test on the electrodes of the prepared materials implies that the electrochemical performance is controlled by the quasi-conversion reaction mechanism and it could yield a maximum specific capacity of 445 C/g at a constant current density of 2 mA cm<sup>−2</sup>. A battery-type asymmetric supercapacitor cell was devised using ternary Ni-Ce-Ag-O metal oxide nanocomposites as the counter electrode to the bismuth iron oxide nanostructures. The charge storage performance of the fabricated was assessed within the operating voltage of 1.5 V and it could yield a maximum energy density of 65 W h kg<sup>−1</sup> at a power density of 214 W kg<sup>−1</sup>. Moreover, the charged cell could power up an array of 60 Red LEDs, signifying the potentiality of the prepared electrodes. The findings of the present study strongly support that the bismuth iron oxide nanostructures can be a suitable material for the fabrication of a battery-type negative electrode for asymmetric supercapacitor applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118869"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pulsed electrocatalysis enables enhanced efficient nitrogen oxidation on Ru0.25Mn0.75O2

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118863

Chenglin Li , Xiping Guan , Mingxia Guo , Huayue Song , Hanwen Xu , Xin Ding , Botao Zhang

The electrochemical conversion of nitrogen and water into HNO₃ not only enables small-scale and distributed production but also aligns with intermittent renewable energy sources, representing an environmentally friendly and sustainable production technique. Despite extensive investigations into electrochemical nitrogen oxidation technology, its poor performance significantly impedes its development. Herein, Ru_0.25Mn_0.75O₂ was meticulously designed and synthesized for its remarkable application in the exploration of nitrogen oxidation. An astonishing yield of nitric acid amounting to 10614.92 μmol h⁻¹ g⁻¹_cat. was successfully obtained due to the synergistic effect between MnO₂ and RuO₂, as well as the utilization of the pulsed electrocatalytic method. This method enhances the supply of active oxygen intermediates by cleaving water molecules on the catalyst surface while achieving intermittent energy supply and effectively regulating kinetic differences between NOR and its side reactions from multiple perspectives to accomplish highly efficient N₂ conversion, respectively. This groundbreaking work demonstrates a highly effective electrochemical regulation strategy for complex electrochemical reactions involving water such as nitrogen fixation, methane conversion, and multi-carbon product conversion from CO₂.

{"title":"Pulsed electrocatalysis enables enhanced efficient nitrogen oxidation on Ru0.25Mn0.75O2","authors":"Chenglin Li , Xiping Guan , Mingxia Guo , Huayue Song , Hanwen Xu , Xin Ding , Botao Zhang","doi":"10.1016/j.jelechem.2024.118863","DOIUrl":"10.1016/j.jelechem.2024.118863","url":null,"abstract":"<div><div>The electrochemical conversion of nitrogen and water into HNO<sub>3</sub> not only enables small-scale and distributed production but also aligns with intermittent renewable energy sources, representing an environmentally friendly and sustainable production technique. Despite extensive investigations into electrochemical nitrogen oxidation technology, its poor performance significantly impedes its development. Herein, Ru<sub>0.25</sub>Mn<sub>0.75</sub>O<sub>2</sub> was meticulously designed and synthesized for its remarkable application in the exploration of nitrogen oxidation. An astonishing yield of nitric acid amounting to 10614.92 μmol h<sup>−1</sup> g<sup>−1</sup><sub>cat.</sub> was successfully obtained due to the synergistic effect between MnO<sub>2</sub> and RuO<sub>2</sub>, as well as the utilization of the pulsed electrocatalytic method. This method enhances the supply of active oxygen intermediates by cleaving water molecules on the catalyst surface while achieving intermittent energy supply and effectively regulating kinetic differences between NOR and its side reactions from multiple perspectives to accomplish highly efficient N<sub>2</sub> conversion, respectively. This groundbreaking work demonstrates a highly effective electrochemical regulation strategy for complex electrochemical reactions involving water such as nitrogen fixation, methane conversion, and multi-carbon product conversion from CO<sub>2</sub>.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118863"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A fast and accurate estimation of amperometric current response in reaction kinetics

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118884

Yan-Ping Liu , Ji-Huan He

A variety of nonlinear differential models exist for reaction kinetics. Although exact or approximate solutions might not be the main focus in practical applications, the slope at a specific point holds great physical significance and an accurate estimate is crucial. This paper introduces two novel concepts: the point solution and the point slope. These are based on the idea that the accuracy of a particular point is notably higher than that of other points within the solution domain. The paper uses non-Michaelis-Menten kinetics as an example to explain the methodology for obtaining an accurate point slope for the amperometric current response. Moreover, the main factors influencing the response are clearly shown through a closed and simple mathematical formulation. The effectiveness and advantages of this technique are demonstrated by comparing the results with those in existing literature. For the chemistry field to leverage the potential of this approach, this article can serve as a model for practical applications.

引用次数: 0

Zinc-assisted modification of hard carbon for enhanced sodium-ion storage

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118889

Haoming Xiao , Fujian Wang , Jun Peng , Junhui Luo , Hongquan Li , Ziheng Wang , Xianyou Luo , Yong Chen

Hard carbon is recognized as a highly promising anode material for sodium-ion batteries (SIBs), with its microstructure playing a critical role in determining Na⁺ storage performance. Despite recent advancements in improving the Na⁺ storage capabilities of hard carbon, significant challenges remain in optimizing these materials. In this study, zinc-modified hard carbon was synthesized using coconut shells as the carbon source and ZnCl₂ as a modifier. The introduction of ZnCl₂ effectively expanded the graphite interlayer spacing, reduced microcrystal size, and created closed pores, leading to significantly enhanced Na⁺ storage performance. Consequently, the ZnCl₂-modified hard carbon exhibited a high reversible capacity of 352.0 mAh/g, with a plateau capacity of 242.6 mAh/g, outperforming the unmodified hard carbon (294.4 mAh/g and 199.8 mAh/g, respectively). Additionally, the modified material showed superior rate performance and cycling stability. The Na⁺ storage mechanism in the ZnCl₂-modified carbon aligns with the “adsorption-intercalation-filling” model. This study highlights the effectiveness of ZnCl₂ modification in enhancing Na⁺ storage, providing a promising strategy for the development of high-performance hard carbon anodes in SIBs.

{"title":"Zinc-assisted modification of hard carbon for enhanced sodium-ion storage","authors":"Haoming Xiao , Fujian Wang , Jun Peng , Junhui Luo , Hongquan Li , Ziheng Wang , Xianyou Luo , Yong Chen","doi":"10.1016/j.jelechem.2024.118889","DOIUrl":"10.1016/j.jelechem.2024.118889","url":null,"abstract":"<div><div>Hard carbon is recognized as a highly promising anode material for sodium-ion batteries (SIBs), with its microstructure playing a critical role in determining Na<sup>+</sup> storage performance. Despite recent advancements in improving the Na<sup>+</sup> storage capabilities of hard carbon, significant challenges remain in optimizing these materials. In this study, zinc-modified hard carbon was synthesized using coconut shells as the carbon source and ZnCl<sub>2</sub> as a modifier. The introduction of ZnCl<sub>2</sub> effectively expanded the graphite interlayer spacing, reduced microcrystal size, and created closed pores, leading to significantly enhanced Na<sup>+</sup> storage performance. Consequently, the ZnCl<sub>2</sub>-modified hard carbon exhibited a high reversible capacity of 352.0 mAh/g, with a plateau capacity of 242.6 mAh/g, outperforming the unmodified hard carbon (294.4 mAh/g and 199.8 mAh/g, respectively). Additionally, the modified material showed superior rate performance and cycling stability. The Na<sup>+</sup> storage mechanism in the ZnCl<sub>2</sub>-modified carbon aligns with the “adsorption-intercalation-filling” model. This study highlights the effectiveness of ZnCl<sub>2</sub> modification in enhancing Na<sup>+</sup> storage, providing a promising strategy for the development of high-performance hard carbon anodes in SIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118889"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of pretreatment conditions on underpotential and phase deposition of silver on Pt(hkl) single crystal substrates in ethaline

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118887

Elena B. Molodkina, Alexander V. Rudnev, Maria R. Ehrenburg

Deep eutectic solvents (DES) are a special class of solvents with specific properties that offer new possibilities for the electroplating of metals and alloys. Ethaline – a mixture of choline chloride and ethylene glycol (EG) – is one of the less viscous DES, which makes it a commonly used medium for studying electrodeposition. The understanding of the metal electrodeposition behavior is much advanced by the data on structural sensitivity obtained with the help of single crystal electrodes. This work is continuation of a previous study on Ag electrosorption and phase deposition on Pt(111) in ethaline. We extend our studies to other basal single crystal surfaces, Pt(100) and Pt(110). Also, with account for the more pronounced sensitivity of these faces to the laboratory atmosphere as compared to Pt(111) and also with regard to the previously obtained data on the possibility of spontaneous EG decomposition on Pt with formation of a CO-like adspecies, we suggest an EG–protection step in the Pt(hkl) pretreatment procedure. We compare the data on Ag electrosorption and phase deposition on the three basal single crystal surfaces pretreated by EG (EG-protected) as opposed to surfaces with no such pretreatment (unprotected). We demonstrate that the EG-protection step results in the surface poisoning by the blocking adspecies. This brings about a significant lowering of the capacitance currents and the currents related to specific adsorption of ethaline components and Ag underpotential deposition (upd) as compared to those on unprotected Pt(hkl). We also show that phase deposition of silver from ethaline on Pt(hkl) starts at almost zero overpotentials on all electrodes except for EG-protected Pt(110), which is probably related to the presence of the already deposited Ag adlayer (for unprotected electrodes) and Ag adlayer patches (for EG-protected ones). In general, Ag deposition occurs via the Stranski–Krastanov mode. Deposition on unprotected electrodes involves simultaneous 2D and 3D deposit formation, while the deposit obtained at moderate overpotentials on all EG-pretreated electrodes contains well-pronounced individual shaped crystallites.

{"title":"Influence of pretreatment conditions on underpotential and phase deposition of silver on Pt(hkl) single crystal substrates in ethaline","authors":"Elena B. Molodkina, Alexander V. Rudnev, Maria R. Ehrenburg","doi":"10.1016/j.jelechem.2024.118887","DOIUrl":"10.1016/j.jelechem.2024.118887","url":null,"abstract":"<div><div>Deep eutectic solvents (DES) are a special class of solvents with specific properties that offer new possibilities for the electroplating of metals and alloys. Ethaline – a mixture of choline chloride and ethylene glycol (EG) – is one of the less viscous DES, which makes it a commonly used medium for studying electrodeposition. The understanding of the metal electrodeposition behavior is much advanced by the data on structural sensitivity obtained with the help of single crystal electrodes. This work is continuation of a previous study on Ag electrosorption and phase deposition on Pt(111) in ethaline. We extend our studies to other basal single crystal surfaces, Pt(100) and Pt(110). Also, with account for the more pronounced sensitivity of these faces to the laboratory atmosphere as compared to Pt(111) and also with regard to the previously obtained data on the possibility of spontaneous EG decomposition on Pt with formation of a CO-like adspecies, we suggest an EG–protection step in the Pt(hkl) pretreatment procedure. We compare the data on Ag electrosorption and phase deposition on the three basal single crystal surfaces pretreated by EG (EG-protected) as opposed to surfaces with no such pretreatment (unprotected). We demonstrate that the EG-protection step results in the surface poisoning by the blocking adspecies. This brings about a significant lowering of the capacitance currents and the currents related to specific adsorption of ethaline components and Ag underpotential deposition (upd) as compared to those on unprotected Pt(hkl). We also show that phase deposition of silver from ethaline on Pt(hkl) starts at almost zero overpotentials on all electrodes except for EG-protected Pt(110), which is probably related to the presence of the already deposited Ag adlayer (for unprotected electrodes) and Ag adlayer patches (for EG-protected ones). In general, Ag deposition occurs via the Stranski–Krastanov mode. Deposition on unprotected electrodes involves simultaneous 2D and 3D deposit formation, while the deposit obtained at moderate overpotentials on all EG-pretreated electrodes contains well-pronounced individual shaped crystallites.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118887"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Suppression of the hydrogen evolution reaction of Iron–chromium flow batteries by organic compounds containing the imidazole group

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118874

Yihan Deng , Zhaoxin Li , Huayi Tan , Shili Zheng , Bingqiang Fan , Yang Zhang

Iron–chromium redox flow batteries (ICRFBs) are attractive potential long-duration energy storage facilities because of their extensive sources and low cost. However, the hydrogen evolution reaction (HER) causes irreversible capacity loss and limits its application. Herein, we explore the influence of organic compounds containing imidazole groups, such as l-histidine (l-his) and 2-methylimidazole (2-mIm), on the performance of negative iron–chromium electrolytes. The results of molecular dynamics and density functional theory calculations revealed that both additives can interact with chromium ions to regulate the solvation shell and that the new complex structures have greater hydrogen evolution barriers. The electrochemical test results show that 2-mIm has a more significant influence than l-his dose. The findings of the single battery tests with two additives indicate that both additives improve the coulombic efficiency (CE) and average decay rate of ICRFB. The capacity decay rate of ICRFB with the electrolyte containing 0.2 M 2-mIm reached 1.79 %. Compared with that of the pure electrolyte, the capacity decay rate is reduced by 76 % in the 0.2 M 2-mIm electrolyte. It achieves a CE of 97.8 % at a current density of 100 mA·cm⁻². Furthermore, UV–Vis spectroscopy and long-cycle tests revealed that new complex structures are present and stable during battery operation. Finally, the in situ Raman results show that additives can reduce the amount of water and disrupt the hydrogen bond network around the surface of the electrode during energization. The improvement in the hydrogen evolution barrier and Raman results explain the mechanism by which the HER is suppressed. This study provides a feasible rationale for additive selection.

{"title":"Suppression of the hydrogen evolution reaction of Iron–chromium flow batteries by organic compounds containing the imidazole group","authors":"Yihan Deng , Zhaoxin Li , Huayi Tan , Shili Zheng , Bingqiang Fan , Yang Zhang","doi":"10.1016/j.jelechem.2024.118874","DOIUrl":"10.1016/j.jelechem.2024.118874","url":null,"abstract":"<div><div>Iron–chromium redox flow batteries (ICRFBs) are attractive potential long-duration energy storage facilities because of their extensive sources and low cost. However, the hydrogen evolution reaction (HER) causes irreversible capacity loss and limits its application. Herein, we explore the influence of organic compounds containing imidazole groups, such as <span>l</span>-histidine (<span>l</span>-his) and 2-methylimidazole (2-mIm), on the performance of negative iron–chromium electrolytes. The results of molecular dynamics and density functional theory calculations revealed that both additives can interact with chromium ions to regulate the solvation shell and that the new complex structures have greater hydrogen evolution barriers. The electrochemical test results show that 2-mIm has a more significant influence than <span>l</span>-his dose. The findings of the single battery tests with two additives indicate that both additives improve the coulombic efficiency (CE) and average decay rate of ICRFB. The capacity decay rate of ICRFB with the electrolyte containing 0.2 M 2-mIm reached 1.79 %. Compared with that of the pure electrolyte, the capacity decay rate is reduced by 76 % in the 0.2 M 2-mIm electrolyte. It achieves a CE of 97.8 % at a current density of 100 mA·cm<sup>−2</sup>. Furthermore, UV–Vis spectroscopy and long-cycle tests revealed that new complex structures are present and stable during battery operation. Finally, the in situ Raman results show that additives can reduce the amount of water and disrupt the hydrogen bond network around the surface of the electrode during energization. The improvement in the hydrogen evolution barrier and Raman results explain the mechanism by which the HER is suppressed. This study provides a feasible rationale for additive selection.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118874"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semi-interpenetrating polymer network-based gel polymer electrolytes for Li-ion batteries applications

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118885

Lanyang Feng, Yao Xu, Juan Wu, Bencai Lin

In this study, a series of high-performance semi-interpenetrating polymer network (sIPN)-based gel polymer electrolytes (GPEs) were prepared using UV-initiated polymerization of unsaturated-bond-containing ethylene oxide oligomers (specifically poly(ethylene glycol) methyl ether methacrylate(PEGMAMA) and poly(ethylene glycol) diacrylate(PEGDA)), followed by blending with linear poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP). PEGDA was used as the crosslinking agent to form a crosslinked structure with PEGMAMA. This unique architecture not only provided abundant ethylene oxide chain segments but also disrupted the crystallinity of PVDF-HFP. The sIPNs structure imparts GPEs with high thermal stabilities and robust mechanical properties. Among the sIPN-based GPEs, PP₂P₃-IL exhibited a high conductivity of 1.05 × 10⁻³ S cm⁻¹. Owing to the excellent dissociation ability of the sIPNs structure toward Li salts, PP₂P₃-IL shows a high Li-ion transference number of 0.68. The Li|PP₂P₃-IL|Li battery maintained a low steady-state overpotential, even after 800 h. Moreover, the discharge capacity of the Li/LiFePO₄ battery reached 150 mAh g⁻¹, and its capacity retention higher than 95 % even after 100 cycles, demonstrating its strong potential for application in Li-ion battery.

{"title":"Semi-interpenetrating polymer network-based gel polymer electrolytes for Li-ion batteries applications","authors":"Lanyang Feng, Yao Xu, Juan Wu, Bencai Lin","doi":"10.1016/j.jelechem.2024.118885","DOIUrl":"10.1016/j.jelechem.2024.118885","url":null,"abstract":"<div><div>In this study, a series of high-performance semi-interpenetrating polymer network (sIPN)-based gel polymer electrolytes (GPEs) were prepared using UV-initiated polymerization of unsaturated-bond-containing ethylene oxide oligomers (specifically poly(ethylene glycol) methyl ether methacrylate(PEGMAMA) and poly(ethylene glycol) diacrylate(PEGDA)), followed by blending with linear poly(vinylidene fluoride-<em>co</em>-hexafluoropropylene)(PVDF-HFP). PEGDA was used as the crosslinking agent to form a crosslinked structure with PEGMAMA. This unique architecture not only provided abundant ethylene oxide chain segments but also disrupted the crystallinity of PVDF-HFP. The sIPNs structure imparts GPEs with high thermal stabilities and robust mechanical properties. Among the sIPN-based GPEs, PP<sub>2</sub>P<sub>3</sub>-IL exhibited a high conductivity of 1.05 × 10<sup>−3</sup> S cm<sup>−1</sup>. Owing to the excellent dissociation ability of the sIPNs structure toward Li salts, PP<sub>2</sub>P<sub>3</sub>-IL shows a high Li-ion transference number of 0.68. The Li|PP<sub>2</sub>P<sub>3</sub>-IL|Li battery maintained a low steady-state overpotential, even after 800 h. Moreover, the discharge capacity of the Li/LiFePO<sub>4</sub> battery reached 150 mAh g<sup>−1</sup>, and its capacity retention higher than 95 % even after 100 cycles, demonstrating its strong potential for application in Li-ion battery.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118885"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cost-effective and highly selective paper-based potentiometric thiocyanate nanosensor employing nanocomposite for substrate preparation

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118852

Saule Gizatova, Ayça Demirel Özel

This study represents the first investigation into the fabrication of paper-based thiocyanate-selective potentiometric nanosensor, employing a palladium(II) complex as an ionophore. The construction of a new disposable, environmentally friendly and cost-effective sensing platform and the optimization of both nanocomposite ink suspension containing multi-walled carbon nanotubes (MWCNTs) and NiO nanoparticles (NiONPs) used to achieve conductive paper and thiocyanate-selective membrane cocktail deposited onto the paper substrate using a drop-casting technique were described. Electrochemical impedance spectroscopy (EIS) and potentiometric measurements were examined to identify the appropriate ink and selective membrane compositions resulting in best analytical performances such as Nernstian slope of 59.0 ± 0.8 mV/pSCN with 6.7 nM limit of detection (LOD) in linear range of 1.0 × 10⁻⁶- 1.0 × 10⁻¹ M at pH = 2.0. EIS was also used for characterization of membrane-solution interface to confirm interaction between analyte and the ionophore in the organic membrane phase. Water-layer test was performed to evaluate membrane adherence to the conductive paper substrate by chronopotentiometric method. Assessment of the selectivity coefficients determined through the separate solution methodology indicated that the developed nanosensor displayed a highly selective interaction with thiocyanate in comparison to the other anions that were tested. Finally, the repeatability, reproducibility and analytical applicability of the proposed sensor were studied. Artificial saliva, mustard seed and veterinary drug were selected as real sample examples to prove its successful use as an indicator electrode.

{"title":"Cost-effective and highly selective paper-based potentiometric thiocyanate nanosensor employing nanocomposite for substrate preparation","authors":"Saule Gizatova, Ayça Demirel Özel","doi":"10.1016/j.jelechem.2024.118852","DOIUrl":"10.1016/j.jelechem.2024.118852","url":null,"abstract":"<div><div>This study represents the first investigation into the fabrication of paper-based thiocyanate-selective potentiometric nanosensor, employing a palladium(II) complex as an ionophore. The construction of a new disposable, environmentally friendly and cost-effective sensing platform and the optimization of both nanocomposite ink suspension containing multi-walled carbon nanotubes (MWCNTs) and NiO nanoparticles (NiONPs) used to achieve conductive paper and thiocyanate-selective membrane cocktail deposited onto the paper substrate using a drop-casting technique were described. Electrochemical impedance spectroscopy (EIS) and potentiometric measurements were examined to identify the appropriate ink and selective membrane compositions resulting in best analytical performances such as Nernstian slope of 59.0 ± 0.8 mV/pSCNwith 6.7 nM limit of detection (LOD) in linear range of 1.0 × 10<sup>−6</sup>- 1.0 × 10<sup>−1</sup> M at pH = 2.0. EIS was also used for characterization of membrane-solution interface to confirm interaction between analyte and the ionophore in the organic membrane phase. Water-layer test was performed to evaluate membrane adherence to the conductive paper substrate by chronopotentiometric method. Assessment of the selectivity coefficients determined through the separate solution methodology indicated that the developed nanosensor displayed a highly selective interaction with thiocyanate in comparison to the other anions that were tested. Finally, the repeatability, reproducibility and analytical applicability of the proposed sensor were studied. Artificial saliva,mustard seed and veterinary drug were selected as real sample examples to prove its successful use as an indicator electrode.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"978 ","pages":"Article 118852"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the synergistic impact of switched gold and platinum nanocatalyst layers towards methanol electrooxidation reaction

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118905

Raman Kumar , Perumal Viswanathan , Kyuwon Kim , Shanmugam Manivannan

The quest for highly effective and durable electrocatalysts for methanol oxidation remains a contemporary research endeavour in the direct methanol fuel cells (DMFC) domain. Pt-based electrocatalysts remain the front-runner in DMFC due to their exceptional catalytic performance and stability irrespective of cost. In this regard, the present investigation delves into tuning the inherent synergy of the Au/Pt bi-metallic catalytic system by switching the gold (Au) and platinum (Pt) nanocatalyst layers toward boosting methanol electro-oxidation. The sequential electrodeposition strategy was adopted to form distinct catalyst models; Pt on Au (Au/Pt), Au on Pt (Pt/Au), and Au–Pt alloy. Interestingly, switching the outer layer of Au into Pt nanostructures via changing the order of electrodeposition (Pt/Au to Au/Pt), the resulting Au/Pt electrocatalyst exhibits remarkable efficiency and long-term durability regarding methanol oxidation reaction in comparison with mono-metallic Pt and commercial Pt–C. The synergistic effect attained by tuning Au/Pt catalyst layers arises from the following fact that the top Pt layer favours the direct methanol adsorption and its oxidation, while the underlying Au assists the transformation of electroformed CO-like intermediate species into CO₂ and protects the Pt surface from the CO surface poisoning, which makes present catalyst perform better for long duration.

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引用次数: 0

PEDOT: Tosylate-polyamine-based enzymatic organic electrochemical transistors for high-performance glucose biosensing in human urine samples

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-02-01 DOI: 10.1016/j.jelechem.2024.118867

Marjorie Montero-Jimenez , Jael R. Neyra Recky , Catalina von Bilderling , Juliana Scotto , Omar Azzaroni , Waldemar A. Marmisollé

We present the development of enzymatic PEDOT-PAH-based (polyethylenedioxythiophene-polyallylamine hydrochloride) organic electrochemical transistors (OECTs) for glucose detection in human urine samples via direct immobilization of glucose oxidase (GOx) onto PEDOT-PAH via electrostatic interactions. An alternative method for recording OECT responses was introduced, involving continuous switching of gate potential and subsequent data processing, which becomes effective for monitoring protein adsorption and reconstructing temporal response curves to analyte injections. Investigation into the sensing mechanism revealed the pivotal role of pH changes induced by enzymatic catalysis in the transistor response. Evaluation of OECT performance in media with higher ionic strength and buffering capacity demonstrated glucose sensing even in complex biological matrices, including promising results in human urine samples with sensitive response up to 2 mM spiked glucose concentration. These findings not only underscore the functionality of the proposed glucose sensor but also highlight the potential of enzymatic OECT-based sensors for biosensing applications in real biological media.

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引用次数: 0

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