Journal of Electroanalytical Chemistry最新文献

英文中文

Effect of electrostatic immobilization on the electrochemistry of human and horse cytochrome c

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-30 DOI: 10.1016/j.jelechem.2025.118975

José Luis Olloqui-Sariego , I. Márquez , Alejandra Guerra-Castellano , M. Molero , Miguel A. De la Rosa , Juan José Calvente , Irene Díaz-Moreno , Rafael Andreu

Protein film voltammetry is a sensitive tool to characterize the electron transfer properties of redox proteins in a variety of environments and conformational states. Here, a detailed voltammetric study aimed to explore the effect of electrostatic immobilization on the electron transfer thermodynamics and kinetics of adsorbed human- and horse- cytochrome c was carried out. For this purpose, the two cytochromes were adsorbed on thiol monolayers (SAM) with different immobilization strengths and donor–acceptor distances. While thermodynamic redox parameters do not seem to be affected by the monolayer thickness and charge density, electron transfer kinetics are significantly modulated by the protein immobilization strength. Stronger protein–SAM electrostatic interactions result in lower electron transfer rates in both non-adiabatic and friction kinetic regimes. This behavior is further characterized by smaller pre-exponential factors and activation enthalpies in Arrhenius type plots. These kinetic results in the physiologically relevant non-adiabatic electron transfer regime are shown to be consistent with the recently developed Matyushov’s theoretical formulation of protein electron transfer. Moreover, a comparison between the kinetic parameters of the two cytochrome variants supports the hypothesis that differences between their electron transfer rates originate in their structural flexibility to accommodate the conformational changes required to form the precursor complex between cytochrome and a negatively charged redox partner.

{"title":"Effect of electrostatic immobilization on the electrochemistry of human and horse cytochrome c","authors":"José Luis Olloqui-Sariego , I. Márquez , Alejandra Guerra-Castellano , M. Molero , Miguel A. De la Rosa , Juan José Calvente , Irene Díaz-Moreno , Rafael Andreu","doi":"10.1016/j.jelechem.2025.118975","DOIUrl":"10.1016/j.jelechem.2025.118975","url":null,"abstract":"<div><div>Protein film voltammetry is a sensitive tool to characterize the electron transfer properties of redox proteins in a variety of environments and conformational states. Here, a detailed voltammetric study aimed to explore the effect of electrostatic immobilization on the electron transfer thermodynamics and kinetics of adsorbed human- and horse- cytochrome <em>c</em> was carried out. For this purpose, the two cytochromes were adsorbed on thiol monolayers (SAM) with different immobilization strengths and donor–acceptor distances. While thermodynamic redox parameters do not seem to be affected by the monolayer thickness and charge density, electron transfer kinetics are significantly modulated by the protein immobilization strength. Stronger protein–SAM electrostatic interactions result in lower electron transfer rates in both non-adiabatic and friction kinetic regimes. This behavior is further characterized by smaller pre-exponential factors and activation enthalpies in Arrhenius type plots. These kinetic results in the physiologically relevant non-adiabatic electron transfer regime are shown to be consistent with the recently developed Matyushov’s theoretical formulation of protein electron transfer. Moreover, a comparison between the kinetic parameters of the two cytochrome variants supports the hypothesis that differences between their electron transfer rates originate in their structural flexibility to accommodate the conformational changes required to form the precursor complex between cytochrome and a negatively charged redox partner.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118975"},"PeriodicalIF":4.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100925","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

Bio-electro-Fenton systems in wastewater treatment: Research progress and prospects

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-30 DOI: 10.1016/j.jelechem.2025.118959

Peijian Zhang , Sheng Zhang , Min Xu , Shiqi Jiang , Xiyan Ou , Chenjie Wang , Yin Yu , Changyong Wu

Fenton process is a highly promising technology for wastewater treatment, but its operational potential is limited by pH sensitivity and excessive sludge production. The bio-electro-Fenton (BEF) system combines the cost-effectiveness of biotechnology with the sludge reduction effects of electro-Fenton, offering greater economic benefits and treatment potential compared to other enhanced Fenton processes. However, challenges persist in terms of stringent pH control, low electricity production efficiency, and limited reaction efficiency when applied at a large scale. Therefore, this paper introduces the BEF mechanism, examines key factors influencing its efficiency in terms of biological and catalytic performance, and highlights recent innovations in electrode materials, catalysts, and reactor design. The discussion focuses on the challenges and limitations faced by the BEF system in catalysts and reactor configurations for large-scale industrial applications. Strategies are proposed to overcome key technical constraints and enhance the cost-effectiveness of the process. It is recommended to integrate BEF with biological methods, develop highly efficient catalysts, and leverage modeling technologies such as Matlab/Simulink and artificial neural networks to accelerate the full-scale application of BEF technology.

{"title":"Bio-electro-Fenton systems in wastewater treatment: Research progress and prospects","authors":"Peijian Zhang , Sheng Zhang , Min Xu , Shiqi Jiang , Xiyan Ou , Chenjie Wang , Yin Yu , Changyong Wu","doi":"10.1016/j.jelechem.2025.118959","DOIUrl":"10.1016/j.jelechem.2025.118959","url":null,"abstract":"<div><div>Fenton process is a highly promising technology for wastewater treatment, but its operational potential is limited by pH sensitivity and excessive sludge production. The bio-electro-Fenton (BEF) system combines the cost-effectiveness of biotechnology with the sludge reduction effects of electro-Fenton, offering greater economic benefits and treatment potential compared to other enhanced Fenton processes. However, challenges persist in terms of stringent pH control, low electricity production efficiency, and limited reaction efficiency when applied at a large scale. Therefore, this paper introduces the BEF mechanism, examines key factors influencing its efficiency in terms of biological and catalytic performance, and highlights recent innovations in electrode materials, catalysts, and reactor design. The discussion focuses on the challenges and limitations faced by the BEF system in catalysts and reactor configurations for large-scale industrial applications. Strategies are proposed to overcome key technical constraints and enhance the cost-effectiveness of the process. It is recommended to integrate BEF with biological methods, develop highly efficient catalysts, and leverage modeling technologies such as Matlab/Simulink and artificial neural networks to accelerate the full-scale application of BEF technology.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118959"},"PeriodicalIF":4.1,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096680","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

High mass-loading NiCo-LDH@MnCoP nanostructures on Ni foam as an advanced cathode for aqueous supercapacitors

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-28 DOI: 10.1016/j.jelechem.2025.118972

Yunxia Dong, Yali Li, Donghao Li, Yongchao Chen, Jidong Hu, Hao Ning, Yujun Fu, Hongyun Ma, Deyan He, Junshuai Li

This study presents an advanced composite cathode (NiCo-LDH@MnCoP) with a high mass-loading nanostructures on Ni foam through facile hydrothermal and electrochemical deposition techniques. The cathode demonstrates exceptional capacitance, achieving a level of 18511.1 mF cm⁻² at 1 mA cm⁻², commendable rate performance (11244.4 and 8874.7 mF cm⁻² at 10 and 16 mA cm⁻²). The supercapacitor was assembled using AC/CC as the anode, 2 M KOH as the electrolyte and NiCo-LDH@MnCoP/NF as the cathode. Consequently, the device achieved an impressive energy density of 0.610 mWh cm⁻² at 0.775 mW cm⁻² and exhibited excellent cycling stability, with a retention of 80.8 % of its initial capacitance after 20,000 cycles at 20 mA cm⁻², while maintaining an approximate Coulombic efficiency of 100 % throughout the cycling process. Furthermore, assembling supercapacitors into two series-connected coin-cells lights up a red LED for up to 44 min.

{"title":"High mass-loading NiCo-LDH@MnCoP nanostructures on Ni foam as an advanced cathode for aqueous supercapacitors","authors":"Yunxia Dong, Yali Li, Donghao Li, Yongchao Chen, Jidong Hu, Hao Ning, Yujun Fu, Hongyun Ma, Deyan He, Junshuai Li","doi":"10.1016/j.jelechem.2025.118972","DOIUrl":"10.1016/j.jelechem.2025.118972","url":null,"abstract":"<div><div>This study presents an advanced composite cathode (NiCo-LDH@MnCoP) with a high mass-loading nanostructures on Ni foam through facile hydrothermal and electrochemical deposition techniques. The cathode demonstrates exceptional capacitance, achieving a level of 18511.1 mF cm<sup>−2</sup> at 1 mA cm<sup>−2</sup>, commendable rate performance (11244.4 and 8874.7 mF cm<sup>−2</sup> at 10 and 16 mA cm<sup>−2</sup>). The supercapacitor was assembled using AC/CC as the anode, 2 M KOH as the electrolyte and NiCo-LDH@MnCoP/NF as the cathode. Consequently, the device achieved an impressive energy density of 0.610 mWh cm<sup>−2</sup> at 0.775 mW cm<sup>−2</sup> and exhibited excellent cycling stability, with a retention of 80.8 % of its initial capacitance after 20,000 cycles at 20 mA cm<sup>−2</sup>, while maintaining an approximate Coulombic efficiency of 100 % throughout the cycling process. Furthermore, assembling supercapacitors into two series-connected coin-cells lights up a red LED for up to 44 min.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118972"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100928","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

Ternary single metal atom oxides anchored on bimetal oxides for enhanced electrocatalytic oxygen evolution reaction in alkaline medium

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-28 DOI: 10.1016/j.jelechem.2025.118963

Karuppaiah Selvakumar , Muthuraj Arunpandian , Abdellatif M. Sadeq , Abdalrahman Alajmi , Tae Hwan Oh , Asma A. Alothman , Saikh Mohammad , Meenakshisundaram Swaminathan

A stronger electrocatalytic oxygen evolution reaction (OER) may be achieved by anchoring W, Cu, and Co single metal atom oxides (SMAO) nanocomposite catalysts with Co₃O₄-CeO₂ coupled rGO (R-Co₃O₄-CeO₂-WCC-3). The as-obtained catalyst materials are subjected to studies employing powder XRD, XPS, FESEM, HRTEM, and STEM-HAADF to assess the material’s structural purity, oxidation state of components, surface morphology, and presence of SMAO. The SMAO anchoring by a highly scalable one-step sonication synthesis significantly enhanced the catalysts’ mass, charge transfer, and active site density. Excellent catalytic activity for OER under alkaline circumstances was accordingly shown by the R-Co₃O₄-CeO₂-WCC electrocatalysts. Particularly, the optimal R-Co₃O₄-CeO₂-WCC-3 catalyst had a relatively small Tafel slope of 52 mV dec^–1 and low overpotentials of 282 and 353 mV for current densities of 10 and 100 mA cm⁻² respectively. Additionally, we used the DFT calculation to examine the OER activity of a single W atom anchoring on the CO₃O₄-CeO₂ materials. All of these results suggest that Co₃O₄-CeO₂-rGO could be used as an anchor for transition single metal atom catalysts to make new, interesting, and useful electrocatalysts.

{"title":"Ternary single metal atom oxides anchored on bimetal oxides for enhanced electrocatalytic oxygen evolution reaction in alkaline medium","authors":"Karuppaiah Selvakumar , Muthuraj Arunpandian , Abdellatif M. Sadeq , Abdalrahman Alajmi , Tae Hwan Oh , Asma A. Alothman , Saikh Mohammad , Meenakshisundaram Swaminathan","doi":"10.1016/j.jelechem.2025.118963","DOIUrl":"10.1016/j.jelechem.2025.118963","url":null,"abstract":"<div><div>A stronger electrocatalytic oxygen evolution reaction (OER) may be achieved by anchoring W, Cu, and Co single metal atom oxides (SMAO) nanocomposite catalysts with Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> coupled rGO (R-Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>-WCC-3). The as-obtained catalyst materials are subjected to studies employing powder XRD, XPS, FESEM, HRTEM, and STEM-HAADF to assess the material’s structural purity, oxidation state of components, surface morphology, and presence of SMAO. The SMAO anchoring by a highly scalable one-step sonication synthesis significantly enhanced the catalysts’ mass, charge transfer, and active site density. Excellent catalytic activity for OER under alkaline circumstances was accordingly shown by the R-Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>-WCC electrocatalysts. Particularly, the optimal R-Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>-WCC-3 catalyst had a relatively small Tafel slope of 52 mV dec<sup>–1</sup> and low overpotentials of 282 and 353 mV for current densities of 10 and 100 mA cm<sup>−2</sup> respectively. Additionally, we used the DFT calculation to examine the OER activity of a single W atom anchoring on the CO<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub> materials. All of these results suggest that Co<sub>3</sub>O<sub>4</sub>-CeO<sub>2</sub>-rGO could be used as an anchor for transition single metal atom catalysts to make new, interesting, and useful electrocatalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118963"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096667","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

Synthesis, electrochemical characterization, and kinetics study of sodium ion insertion/de-insertion at Na3CoCO3PO4 in aqueous Na2SO4 using electrochemical impedance spectroscopy

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-28 DOI: 10.1016/j.jelechem.2025.118965

Hanumanthrayappa Manjunatha , Kudekallu Shiprath , Sannapaneni Janardhan , Kesamsetty Venkata Ratnam

In this work, Na₃CoCO₃PO₄ (NCCP), a cathode material for aqueous sodium ion batteries is synthesized by low temperature ionothermal method using Deep Eutectic Solvent (DES) as reaction medium. A basic electrochemical study on the mechanism of sodium ion de-insertion/insertion process from/into the NCCP in aqueous Na₂SO₄ solution is done using electrochemical impedance spectroscopy (EIS). X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispersive X-ray analysis (EDX) and thermogravimetric analysis (TGA) are used for physical characterizations of the material. The physical characterization revealed that the synthesized material is a nanomaterial with a particle size of 15–30 nm. Cyclic voltammetry (CV) Galvanostatic charge–discharge techniques (GCPL) are used for electrochemical characterization of the material. The impedance data obtained from the kinetic study of the material for Na⁺ insertion and de-insertion process are subjected to simulation with an equivalent circuit. The charge transfer resistance (R_ct), Warburg resistance, double layer capacitance and chemical diffusion coefficient (D_Na+) vary with potentials during de-insertion/insertion processes. R_ct is lowest at the CV peak potentials and the important kinetic parameter, D_Na+ exhibits two distinct minima at potentials corresponding to CV peaks during de-insertion/insertion and it is found to be varying between 10⁻¹¹ and 10⁻¹³ cm² s⁻¹ during sodium de-insertion/insertion processes.

{"title":"Synthesis, electrochemical characterization, and kinetics study of sodium ion insertion/de-insertion at Na3CoCO3PO4 in aqueous Na2SO4 using electrochemical impedance spectroscopy","authors":"Hanumanthrayappa Manjunatha , Kudekallu Shiprath , Sannapaneni Janardhan , Kesamsetty Venkata Ratnam","doi":"10.1016/j.jelechem.2025.118965","DOIUrl":"10.1016/j.jelechem.2025.118965","url":null,"abstract":"<div><div>In this work, Na<sub>3</sub>CoCO<sub>3</sub>PO<sub>4</sub> (NCCP), a cathode material for aqueous sodium ion batteries is synthesized by low temperature ionothermal method using Deep Eutectic Solvent (DES) as reaction medium. A basic electrochemical study on the mechanism of sodium ion de-insertion/insertion process from/into the NCCP in aqueous Na<sub>2</sub>SO<sub>4</sub> solution is done using electrochemical impedance spectroscopy (EIS). X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispersive X-ray analysis (EDX) and thermogravimetric analysis (TGA) are used for physical characterizations of the material. The physical characterization revealed that the synthesized material is a nanomaterial with a particle size of 15–30 nm. Cyclic voltammetry (CV) Galvanostatic charge–discharge techniques (GCPL) are used for electrochemical characterization of the material. The impedance data obtained from the kinetic study of the material for Na<sup>+</sup> insertion and de-insertion process are subjected to simulation with an equivalent circuit. The charge transfer resistance (<em>R<sub>ct</sub></em>), Warburg resistance, double layer capacitance and chemical diffusion coefficient (<em>D</em><sub>Na+</sub>) vary with potentials during de-insertion/insertion processes. <em>R<sub>ct</sub></em> is lowest at the CV peak potentials and the important kinetic parameter, <em>D</em><sub>Na+</sub> exhibits two distinct minima at potentials corresponding to CV peaks during de-insertion/insertion and it is found to be varying between 10<sup>−11</sup> and 10<sup>−13</sup> cm<sup>2</sup> s<sup>−1</sup> during sodium de-insertion/insertion processes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118965"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096668","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

Facile preparation NiS/NiCo-LDH via electrodeposition for hybrid supercapacitors

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-27 DOI: 10.1016/j.jelechem.2025.118955

Ju Zhang , Junli Wang , Xuanbing Wang , Naixuan Zong , Jinlong Wei , Jing Wang , Can Zhang , Yuantao Yang , Shengyou Su , Tianyang Liu , Ruidong Xu , Linjing Yang

Transition metal sulfides are widely recognized for their low cost, low toxicity, high safety, and potential as a positive electrode material for supercapacitors. However, due to its own volume effect, it usually has poor capacitance retention as positive electrode materials. Herein, the NiS/NiCo-LDH (Layered double hydroxide, LDH) electrodes with considerable practical application potential is designed and prepared. The composite electrodes are prepared by a simple two-step electrodeposition process. The NiS/NiCo-LDH electrode, with its rational design, exhibits more superior electrochemical performance compared to a single NiS electrode. The NiS/NiCo-LDH electrode shows a mass specific capacitance of 2620 F/g at a current density of 1 A/g, which is 1.88 times that of the single NiS electrode. Furthermore, the assembled NiS/NiCo-LDH//AC hybrid supercapacitor (HSC) device achieves an energy density of 93.3 Wh kg⁻¹ at a power density of 800 W kg⁻¹. Therefore, this work provides a new strategy for preparing supercapacitor electrode materials with excellent electrochemical performance.

{"title":"Facile preparation NiS/NiCo-LDH via electrodeposition for hybrid supercapacitors","authors":"Ju Zhang , Junli Wang , Xuanbing Wang , Naixuan Zong , Jinlong Wei , Jing Wang , Can Zhang , Yuantao Yang , Shengyou Su , Tianyang Liu , Ruidong Xu , Linjing Yang","doi":"10.1016/j.jelechem.2025.118955","DOIUrl":"10.1016/j.jelechem.2025.118955","url":null,"abstract":"<div><div>Transition metal sulfides are widely recognized for their low cost, low toxicity, high safety, and potential as a positive electrode material for supercapacitors. However, due to its own volume effect, it usually has poor capacitance retention as positive electrode materials. Herein, the NiS/NiCo-LDH (Layered double hydroxide, LDH) electrodes with considerable practical application potential is designed and prepared. The composite electrodes are prepared by a simple two-step electrodeposition process. The NiS/NiCo-LDH electrode, with its rational design, exhibits more superior electrochemical performance compared to a single NiS electrode. The NiS/NiCo-LDH electrode shows a mass specific capacitance of 2620 F/g at a current density of 1 A/g, which is 1.88 times that of the single NiS electrode. Furthermore, the assembled NiS/NiCo-LDH//AC hybrid supercapacitor (HSC) device achieves an energy density of 93.3 Wh kg<sup>−1</sup> at a power density of 800 W kg<sup>−1</sup>. Therefore, this work provides a new strategy for preparing supercapacitor electrode materials with excellent electrochemical performance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"980 ","pages":"Article 118955"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164275","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

Development of free-standing h-BN/rGO/S composite cathodes for Li-S batteries: h-BN content and temperature effect

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-27 DOI: 10.1016/j.jelechem.2025.118961

Ayşe Şahin , Hilal Günsel , Şeyma Dombaycıoğlu , Ali Osman Aydın

This study aims to improve the properties of Li-S batteries and overcome their disadvantages by utilizing hexagonal boron nitride (h-BN) nanocomposites with unique features that provide advantages in their applications. For this purpose, composite films were produced using h-BN with superior mechanical and chemical properties along with reduced graphene oxide (rGO) possessing high electrical conductivity. Free-standing and flexible h-BN/rGO/S composite paper electrodes containing different weight ratios of functionalized h-BN were prepared. The obtained binder-free composite papers were employed as cathodes in Li-S batteries and applied at different temperatures. In this study, the structural, morphological, and thermal analyses of the composite cathodes were conducted using X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The optical measurements were carried out by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and ultraviolet–visible spectroscopy (UV–Vis). After assembling CR2032 button cells, electrochemical performance tests were applied to assess the charge–discharge capacities. A high discharge capacity of 427 mAh g⁻¹ was achieved after 1000 cycles. As a result, h-BN/rGO-based composites have been developed as environmentally friendly and metal-free materials, further enhancing the electrochemical performance and electron transport of lithium batteries.

{"title":"Development of free-standing h-BN/rGO/S composite cathodes for Li-S batteries: h-BN content and temperature effect","authors":"Ayşe Şahin , Hilal Günsel , Şeyma Dombaycıoğlu , Ali Osman Aydın","doi":"10.1016/j.jelechem.2025.118961","DOIUrl":"10.1016/j.jelechem.2025.118961","url":null,"abstract":"<div><div>This study aims to improve the properties of Li-S batteries and overcome their disadvantages by utilizing hexagonal boron nitride (h-BN) nanocomposites with unique features that provide advantages in their applications. For this purpose, composite films were produced using h-BN with superior mechanical and chemical properties along with reduced graphene oxide (rGO) possessing high electrical conductivity. Free-standing and flexible h-BN/rGO/S composite paper electrodes containing different weight ratios of functionalized h-BN were prepared. The obtained binder-free composite papers were employed as cathodes in Li-S batteries and applied at different temperatures. In this study, the structural, morphological, and thermal analyses of the composite cathodes were conducted using X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The optical measurements were carried out by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and ultraviolet–visible spectroscopy (UV–Vis). After assembling CR2032 button cells, electrochemical performance tests were applied to assess the charge–discharge capacities. A high discharge capacity of 427 mAh g<sup>−1</sup> was achieved after 1000 cycles. As a result, h-BN/rGO-based composites have been developed as environmentally friendly and metal-free materials, further enhancing the electrochemical performance and electron transport of lithium batteries.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118961"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100929","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

Theoretical study on oxidation-reducing properties of polyacetal solid electrolytes

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-27 DOI: 10.1016/j.jelechem.2025.118964

Ying Lin, Qing Yuan, Xiumei Pan

Density functional theory (DFT) is used to study the redox properties of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and polyacetal [P(2EO-MO), P(EO-MO), P(EO-2MO)] electrolyte system. It is found that the oxidation potential is mainly controlled by the polymer, the reduction potential depends on the salt anion. Among three polyacetal electrolytes, P(EO-MO) has the most excellent electrochemical window, can be used as a high-pressure electrolyte material. Another six lithium salts (LiCF₃SO₃, LiDFSI, LiPDI, LiTDI, LiBOB, LiDFOB) and five substituents (–CN, –F, –CF₃, –NH₂, –CH₃) are selected to modify the polyacetal electrolyte in order to design a new solid electrolyte with better electrochemical performance. It is found that the electrolyte composed of LiCF₃SO₃ and polyacetal has good electrochemical stability. The introduction of electron-absorbing groups improves the oxidation potential of the three polyacetals, the introduction of electron-donating groups can improve the reduction stability of the polymers. Based on this, three substituent-functional polymers, P(EO-MO)-CN, P(EO-MO)-F and P(EO-MO)-CH₃, are designed to pair LiCF₃SO₃ to form electrolytes. These three electrolytes have a wide electrochemical window and can be used as high-voltage cathode resistant materials. These results enrich the theoretical research of redox properties of polyacetal electrolytes and provide theoretical guidance for the design of polyacetal electrolytes.

{"title":"Theoretical study on oxidation-reducing properties of polyacetal solid electrolytes","authors":"Ying Lin, Qing Yuan, Xiumei Pan","doi":"10.1016/j.jelechem.2025.118964","DOIUrl":"10.1016/j.jelechem.2025.118964","url":null,"abstract":"<div><div>Density functional theory (DFT) is used to study the redox properties of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and polyacetal [P(2EO-MO), P(EO-MO), P(EO-2MO)] electrolyte system. It is found that the oxidation potential is mainly controlled by the polymer, the reduction potential depends on the salt anion. Among three polyacetal electrolytes, P(EO-MO) has the most excellent electrochemical window, can be used as a high-pressure electrolyte material. Another six lithium salts (LiCF<sub>3</sub>SO<sub>3</sub>, LiDFSI, LiPDI, LiTDI, LiBOB, LiDFOB) and five substituents (–CN, –F, –CF<sub>3</sub>, –NH<sub>2</sub>, –CH<sub>3</sub>) are selected to modify the polyacetal electrolyte in order to design a new solid electrolyte with better electrochemical performance. It is found that the electrolyte composed of LiCF<sub>3</sub>SO<sub>3</sub> and polyacetal has good electrochemical stability. The introduction of electron-absorbing groups improves the oxidation potential of the three polyacetals, the introduction of electron-donating groups can improve the reduction stability of the polymers. Based on this, three substituent-functional polymers, P(EO-MO)-CN, P(EO-MO)-F and P(EO-MO)-CH<sub>3</sub>, are designed to pair LiCF<sub>3</sub>SO<sub>3</sub> to form electrolytes. These three electrolytes have a wide electrochemical window and can be used as high-voltage cathode resistant materials. These results enrich the theoretical research of redox properties of polyacetal electrolytes and provide theoretical guidance for the design of polyacetal electrolytes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118964"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100926","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

In situ study of the diffusion of hydrogen on TiO2 under the influence of Au during electrolytic reduction of water

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-26 DOI: 10.1016/j.jelechem.2025.118957

Guangyuan Xu , Mengqi Wan , Lufeng Yuan , Wangyang Li , Qian Wen , Minghui Fan , Zhen Zhang

The behavior of H species on electrocatalysts is important to hydrogen evolution reaction and other H-related catalytic reactions. In this work, the electrolytic reduction of water in alkaline media and the diffusion of hydrogen on TiO₂ and Au supported TiO₂ (Au/TiO₂) were in situ characterized. In contrast to TiO₂ electrode, the Au/TiO₂ electrode showed a notably enhanced reduction current due to the spillover of hydrogen from TiO₂ to Au and subsequent recombination of hydrogen. In situ electrochemistry Raman spectroscopy showed that the produced H species upon water reduction readily diffuses throughout the TiO₂ lattice causing the lattice distortion of TiO₂ on the TiO₂ electrode but not on the Au/TiO₂ electrode. The electrochemical impedance spectroscopy (EIS) investigation revealed the bulk diffusion mechanism for hydrogen diffusion on TiO₂ and surface diffusion mechanism on Au/TiO₂ electrode. This study highlights the critical role of interface and boundary structures in governing hydrogen diffusion behavior at TiO₂ and Au/TiO₂ electrodes and deepens our understanding of the hydrogen behavior in the hydrogen evolution reactions and other hydrogen-related reactions on metal oxide surfaces.

{"title":"In situ study of the diffusion of hydrogen on TiO2 under the influence of Au during electrolytic reduction of water","authors":"Guangyuan Xu , Mengqi Wan , Lufeng Yuan , Wangyang Li , Qian Wen , Minghui Fan , Zhen Zhang","doi":"10.1016/j.jelechem.2025.118957","DOIUrl":"10.1016/j.jelechem.2025.118957","url":null,"abstract":"<div><div>The behavior of H species on electrocatalysts is important to hydrogen evolution reaction and other H-related catalytic reactions. In this work, the electrolytic reduction of water in alkaline media and the diffusion of hydrogen on TiO<sub>2</sub> and Au supported TiO<sub>2</sub> (Au/TiO<sub>2</sub>) were in situ characterized. In contrast to TiO<sub>2</sub> electrode, the Au/TiO<sub>2</sub> electrode showed a notably enhanced reduction current due to the spillover of hydrogen from TiO<sub>2</sub> to Au and subsequent recombination of hydrogen. In situ electrochemistry Raman spectroscopy showed that the produced H species upon water reduction readily diffuses throughout the TiO<sub>2</sub> lattice causing the lattice distortion of TiO<sub>2</sub> on the TiO<sub>2</sub> electrode but not on the Au/TiO<sub>2</sub> electrode. The electrochemical impedance spectroscopy (EIS) investigation revealed the bulk diffusion mechanism for hydrogen diffusion on TiO<sub>2</sub> and surface diffusion mechanism on Au/TiO<sub>2</sub> electrode. This study highlights the critical role of interface and boundary structures in governing hydrogen diffusion behavior at TiO<sub>2</sub> and Au/TiO<sub>2</sub> electrodes and deepens our understanding of the hydrogen behavior in the hydrogen evolution reactions and other hydrogen-related reactions on metal oxide surfaces.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118957"},"PeriodicalIF":4.1,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100927","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

Hydrangea-like bimetallic Ni-Co phosphide electrodeposited on CNT arrays for oxygen evolution reaction

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2025-01-26 DOI: 10.1016/j.jelechem.2025.118960

Xiangqun Zeng , Shuanghui Zeng , Hang Cong , Jie Zhao , Dongjing Liu

The design of efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is of great significance for the promotion of hydrogen energy utilization. Transition metal phosphides have attracted considerable interest due to their exceptional electrochemical properties. In this study, a hydrangea-like bimetallic nickel–cobalt phosphides were deposited on carbon nanotube arrays using a potentiostatic electrodeposition method. The OER catalytic activity of the composite were optimized by modulating the electrolyte composition and electrodeposition time. The optimal hydrangea-like Ni-Co-P/CNTs@CC-25 catalyst shows an overpotential of 320 mV to deliver the current density of 10 mA cm⁻² and a Tafel slope of 84.04 mV dec⁻¹ in 1 M KOH, which is comparable to RuO₂ standard catalyst. The incorporation of carbon nanotubes (CNTs) enhances the conductivity and stability of the catalyst, while the synergistic effects between Ni and Co phosphides improve its electrochemical activity. Furthermore, the Ni-Co-P/CNTs@CC-25 electrode exhibits remarkable long-term stability, maintaining 76.7 % of its initial current density after 96 h of continuous operation. This work provides an efficient preparation strategy of metal phosphides coupled with CNTs by electrodeposition method.

{"title":"Hydrangea-like bimetallic Ni-Co phosphide electrodeposited on CNT arrays for oxygen evolution reaction","authors":"Xiangqun Zeng , Shuanghui Zeng , Hang Cong , Jie Zhao , Dongjing Liu","doi":"10.1016/j.jelechem.2025.118960","DOIUrl":"10.1016/j.jelechem.2025.118960","url":null,"abstract":"<div><div>The design of efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is of great significance for the promotion of hydrogen energy utilization. Transition metal phosphides have attracted considerable interest due to their exceptional electrochemical properties. In this study, a hydrangea-like bimetallic nickel–cobalt phosphides were deposited on carbon nanotube arrays using a potentiostatic electrodeposition method. The OER catalytic activity of the composite were optimized by modulating the electrolyte composition and electrodeposition time. The optimal hydrangea-like Ni-Co-P/CNTs@CC-25 catalyst shows an overpotential of 320 mV to deliver the current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 84.04 mV dec<sup>−1</sup> in 1 M KOH, which is comparable to RuO<sub>2</sub> standard catalyst. The incorporation of carbon nanotubes (CNTs) enhances the conductivity and stability of the catalyst, while the synergistic effects between Ni and Co phosphides improve its electrochemical activity. Furthermore, the Ni-Co-P/CNTs@CC-25 electrode exhibits remarkable long-term stability, maintaining 76.7 % of its initial current density after 96 h of continuous operation. This work provides an efficient preparation strategy of metal phosphides coupled with CNTs by electrodeposition method.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 118960"},"PeriodicalIF":4.1,"publicationDate":"2025-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100930","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

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