In this paper, we study the electrochemical properties of hydrogenated Au/TiO2 nanowires (NWs) synthesised by seed-assisted oxidation. Hydrogenation was performed electrochemically or by annealing in forming gas. The reduction process leads to a 20× improvement in photocurrent and introduces defects at the nanowires/water interface. At high frequencies, the usual Randles circuit is used. The depletion layer defect density is estimated to be 1016, 1018 and 1020 cm−3 for “as-grown”, “Forming gas” and “electrochemically reduced” samples, respectively. At frequencies lower than the relaxation frequency, defects localised at the nanowire/water interface cause an enhancement in capacitance. Under UV irradiation, a density of 1012 cm−2 can be estimated for these defects at about 0 VAg/AgCl.
{"title":"Photo-electro-chemical properties of hydrogenated Au/TiO2 nanowires grown by seed-assisted thermal oxidation","authors":"Massimo Zimbone , Lucia Calcagno , Giuliana Impellizzeri","doi":"10.1016/j.elecom.2025.108021","DOIUrl":"10.1016/j.elecom.2025.108021","url":null,"abstract":"<div><div>In this paper, we study the electrochemical properties of hydrogenated Au/TiO<sub>2</sub> nanowires (NWs) synthesised by seed-assisted oxidation. Hydrogenation was performed electrochemically or by annealing in forming gas. The reduction process leads to a 20× improvement in photocurrent and introduces defects at the nanowires/water interface. At high frequencies, the usual Randles circuit is used. The depletion layer defect density is estimated to be 10<sup>16</sup>, 10<sup>18</sup> and 10<sup>20</sup> cm<sup>−3</sup> for “as-grown”, “Forming gas” and “electrochemically reduced” samples, respectively. At frequencies lower than the relaxation frequency, defects localised at the nanowire/water interface cause an enhancement in capacitance. Under UV irradiation, a density of 10<sup>12</sup> cm<sup>−2</sup> can be estimated for these defects at about 0 V<sub>Ag/AgCl</sub>.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108021"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-01DOI: 10.1016/j.elecom.2025.108039
Sang Bum Lee , Kwang-Mo Kang , Ji-Hyeong Lee , Yoon-Chae Nah
This study demonstrates a significant enhancement in reversible metal electrodeposition devices (RMEDs) through a systematic activation process using a silver‑copper electrolyte system. An electrode conditioning protocol employing a wider voltage range cyclic voltammetry (−3.5 V to 1.3 V) was developed to enable robust four-state optical switching beyond traditional transparent-mirror operation. The activation process resulted in a 63.6% increase in electrochemical activity and improved coloration efficiency, increasing from 43.2 to 54.7 cm2/C. Using an optimized step-voltage method, vivid red and blue color states were achieved, with transmittance modulation increasing from 26.2% to 58.9% for red color and from 56.9% to 63.0% for blue color after activation. The four-state device demonstrated excellent long-term stability, maintaining consistent optical performance over 6000 s of continuous cycling without degradation. This work establishes electrode activation as a key advancement for practical smart window applications, offering both aesthetic versatility through multicolor options and operational reliability for commercial use.
{"title":"Activation-enhanced four-state electrochromic mirrors with enhanced optical performance","authors":"Sang Bum Lee , Kwang-Mo Kang , Ji-Hyeong Lee , Yoon-Chae Nah","doi":"10.1016/j.elecom.2025.108039","DOIUrl":"10.1016/j.elecom.2025.108039","url":null,"abstract":"<div><div>This study demonstrates a significant enhancement in reversible metal electrodeposition devices (RMEDs) through a systematic activation process using a silver‑copper electrolyte system. An electrode conditioning protocol employing a wider voltage range cyclic voltammetry (−3.5 V to 1.3 V) was developed to enable robust four-state optical switching beyond traditional transparent-mirror operation. The activation process resulted in a 63.6% increase in electrochemical activity and improved coloration efficiency, increasing from 43.2 to 54.7 cm<sup>2</sup>/C. Using an optimized step-voltage method, vivid red and blue color states were achieved, with transmittance modulation increasing from 26.2% to 58.9% for red color and from 56.9% to 63.0% for blue color after activation. The four-state device demonstrated excellent long-term stability, maintaining consistent optical performance over 6000 s of continuous cycling without degradation. This work establishes electrode activation as a key advancement for practical smart window applications, offering both aesthetic versatility through multicolor options and operational reliability for commercial use.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108039"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-10-10DOI: 10.1016/j.elecom.2025.108062
E. Mohammadiha, S.M. Masoudpanah, S. Alamolhoda
In this work, single-phase Li₃V₂(PO₄)₃ powders were synthesized by the solution combustion route using cetyltrimethylammonium bromide (CTAB) and/or polyvinyl pyrrolidine (PVP) as organic fuel following calcination at above 750 °C. The large Li₃V₂(PO₄)₃ particles were dispersed in a carbon substrate, which was obtained by thermally decomposing the CTAB and PVP fuels as a carbon source. Furthermore, there was a carbon layer on Li₃V₂(PO₄)₃ particles with an average thickness of 12 and 5 nm for CTAB and PVP, respectively. The CTAB-assisted Li₃V₂(PO₄)₃/C powders showed a higher charge storage capability, including a higher discharge specific capacity of 110 mAh g−1 at 0.1C, higher rate capability, and higher capacity retention of 99 % at 1C for 200 charge/discharge cycles. The higher electrochemical performance was attributed to the higher crystallinity, higher graphitization of the carbon layer, and lower charge transfer resistance caused by the CTAB fuel.
本文以十六烷基三甲基溴化铵（CTAB）和/或聚乙烯醇吡咯烷（PVP）为有机燃料，在750℃以上煅烧，采用溶液燃烧的方法合成了单相Li₃V₂（PO₄）₃粉体。将CTAB和PVP燃料作为碳源热分解得到的Li₃V₂（PO₄）₃大颗粒分散在碳基质中。此外，CTAB和PVP的Li₃V₂（PO₄）₃颗粒上有碳层，平均厚度分别为12 nm和5 nm。ctab辅助的Li₃V₂（PO₄）₃/C粉体具有较高的电荷存储能力，包括在0.1C下的放电比容量为110 mAh g−1，更高的倍率容量，在1C下200次充放电循环的容量保持率为99%。CTAB燃料具有较高的结晶度、较高的碳层石墨化程度和较低的电荷转移电阻，从而提高了电化学性能。
{"title":"Surfactant-assisted solution combustion synthesis of Li3V2(PO4)3/C cathode material for lithium-ion battery","authors":"E. Mohammadiha, S.M. Masoudpanah, S. Alamolhoda","doi":"10.1016/j.elecom.2025.108062","DOIUrl":"10.1016/j.elecom.2025.108062","url":null,"abstract":"<div><div>In this work, single-phase Li₃V₂(PO₄)₃ powders were synthesized by the solution combustion route using cetyltrimethylammonium bromide (CTAB) and/or polyvinyl pyrrolidine (PVP) as organic fuel following calcination at above 750 °C. The large Li₃V₂(PO₄)₃ particles were dispersed in a carbon substrate, which was obtained by thermally decomposing the CTAB and PVP fuels as a carbon source. Furthermore, there was a carbon layer on Li₃V₂(PO₄)₃ particles with an average thickness of 12 and 5 nm for CTAB and PVP, respectively. The CTAB-assisted Li₃V₂(PO₄)₃/C powders showed a higher charge storage capability, including a higher discharge specific capacity of 110 mAh g<sup>−1</sup> at 0.1C, higher rate capability, and higher capacity retention of 99 % at 1C for 200 charge/discharge cycles. The higher electrochemical performance was attributed to the higher crystallinity, higher graphitization of the carbon layer, and lower charge transfer resistance caused by the CTAB fuel.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108062"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145320649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-10-02DOI: 10.1016/j.elecom.2025.108052
Tengfei Long, Yun Guo
This study investigates aging mechanisms in lithium-ion batteries (LIBs) under high rate conditions using an electrochemical-thermal-mechanical (ETM) coupling model with temperature-radius stratification. Focusing on solid electrolyte interface (SEI) formation, thermal dynamics, and diffusion-induced stress (DIS), we reveal that increasing C-rates significantly elevate heat generation, reducing electrode thermal stability and accelerating positive electrode degradation. High-rate cycling intensifies SEI uneven distribution and concentration, hastening capacity loss. Prolonged cycling shows greater von Mises stress in positive electrodes (tensile deformation) versus negative electrodes (compressive deformation), with lower available lithium-ion concentration in positives. Cut-off voltage analysis demonstrates that reducing charging voltage or increasing discharging voltage mitigates capacity loss, with positive electrodes more sensitive to discharge voltage and negatives to charge voltage. Our temperature-radius stratified model provides precise analysis of fast-charging aging mechanisms, offering theoretical support for optimized battery design and operation strategies. Future work should address SEI film dynamics, lithium plating, and internal gas generation for comprehensive aging understanding.
{"title":"Research on the temperature radius stratification model based on electrochemical-thermal-force coupling in Lithium-ion batteries","authors":"Tengfei Long, Yun Guo","doi":"10.1016/j.elecom.2025.108052","DOIUrl":"10.1016/j.elecom.2025.108052","url":null,"abstract":"<div><div>This study investigates aging mechanisms in lithium-ion batteries (LIBs) under high rate conditions using an electrochemical-thermal-mechanical (ETM) coupling model with temperature-radius stratification. Focusing on solid electrolyte interface (SEI) formation, thermal dynamics, and diffusion-induced stress (DIS), we reveal that increasing C-rates significantly elevate heat generation, reducing electrode thermal stability and accelerating positive electrode degradation. High-rate cycling intensifies SEI uneven distribution and concentration, hastening capacity loss. Prolonged cycling shows greater von Mises stress in positive electrodes (tensile deformation) versus negative electrodes (compressive deformation), with lower available lithium-ion concentration in positives. Cut-off voltage analysis demonstrates that reducing charging voltage or increasing discharging voltage mitigates capacity loss, with positive electrodes more sensitive to discharge voltage and negatives to charge voltage. Our temperature-radius stratified model provides precise analysis of fast-charging aging mechanisms, offering theoretical support for optimized battery design and operation strategies. Future work should address SEI film dynamics, lithium plating, and internal gas generation for comprehensive aging understanding.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108052"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-11DOI: 10.1016/j.elecom.2025.108047
Fariba Garkani Nejad , Hadi Beitollahi , Iran Sheikhshoaie
Copper ions act as essential metal ions in various physiological processes, but their excessive accumulation can cause toxicity and severe risks to human health and the environment. Hence, the sensitive and accurate determination of copper levels in water samples is of great significance for public health protection and environmental monitoring. In this study, a new strategy was proposed for the determination of Cu (II) ions in the water samples based on polyamidoamine dendrimer-functionalized NH2-mesoporous silica (PAMAM-functionalized NH2-MCM-41) as a sensing platform. The PAMAM-functionalized NH2-MCM-41 was prepared by using a post-grafting method. The structure/morphology of the prepared PAMAM-functionalized MCM-41 was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDS) spectroscopy techniques. Then, the PAMAM-functionalized NH2-MCM-41 modified glassy carbon electrode (GCE) was used for differential pulse anodic stripping voltammetric (DPASV) determination of Cu (II). Due to the combination of the high chelating ability of terminal amino groups of PAMAM dendrimer to metal ion (Cu (II)) with the large surface area of MCM-41, the PAMAM/NH2-MCM-41/GCE showed an excellent sensitive effect for Cu (II) determination. The different parameters and conditions affecting the stripping current response of Cu (II), including accumulation time, accumulation potential, and pH value were investigated and optimized. Under the optimum conditions, the stripping peak current of Cu (II) linearly increased with its concentration between the 0.002 μM–8.0 μM. The limit of detection (LOD) is calculated to be 6.1 × 10−10 M for Cu (II) (S/N = 3). Finally, the PAMAM/NH2-MCM-41/GCE sensor was successfully used for the Cu (II) determination in water samples, with acceptable recoveries of 97.1 %–103.3 %. The obtained results showed that PAMAM-Functionalized MCM-41 as a promising modifying material can be potentially used in the design and fabrication of electrochemical sensors for heavy metal ions determination.
{"title":"Application of PAMAM-functionalized NH2-MCM-41 modified glassy carbon electrode for quantitative determination of Cu (II) in water samples by using stripping voltammetry","authors":"Fariba Garkani Nejad , Hadi Beitollahi , Iran Sheikhshoaie","doi":"10.1016/j.elecom.2025.108047","DOIUrl":"10.1016/j.elecom.2025.108047","url":null,"abstract":"<div><div>Copper ions act as essential metal ions in various physiological processes, but their excessive accumulation can cause toxicity and severe risks to human health and the environment. Hence, the sensitive and accurate determination of copper levels in water samples is of great significance for public health protection and environmental monitoring. In this study, a new strategy was proposed for the determination of Cu (II) ions in the water samples based on polyamidoamine dendrimer-functionalized NH<sub>2</sub>-mesoporous silica (PAMAM-functionalized NH<sub>2</sub>-MCM-41) as a sensing platform. The PAMAM-functionalized NH<sub>2</sub>-MCM-41 was prepared by using a post-grafting method. The structure/morphology of the prepared PAMAM-functionalized MCM-41 was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDS) spectroscopy techniques. Then, the PAMAM-functionalized NH<sub>2</sub>-MCM-41 modified glassy carbon electrode (GCE) was used for differential pulse anodic stripping voltammetric (DPASV) determination of Cu (II). Due to the combination of the high chelating ability of terminal amino groups of PAMAM dendrimer to metal ion (Cu (II)) with the large surface area of MCM-41, the PAMAM/NH<sub>2</sub>-MCM-41/GCE showed an excellent sensitive effect for Cu (II) determination. The different parameters and conditions affecting the stripping current response of Cu (II), including accumulation time, accumulation potential, and pH value were investigated and optimized. Under the optimum conditions, the stripping peak current of Cu (II) linearly increased with its concentration between the 0.002 μM–8.0 μM. The limit of detection (LOD) is calculated to be 6.1 × 10<sup>−10</sup> M for Cu (II) (S/N = 3). Finally, the PAMAM/NH<sub>2</sub>-MCM-41/GCE sensor was successfully used for the Cu (II) determination in water samples, with acceptable recoveries of 97.1 %–103.3 %. The obtained results showed that PAMAM-Functionalized MCM-41 as a promising modifying material can be potentially used in the design and fabrication of electrochemical sensors for heavy metal ions determination.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108047"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-24DOI: 10.1016/j.elecom.2025.108053
Enrique H. Balaguera
Impedance spectroscopy (IS) is classically used to study the dynamical properties of electrochemical systems but now is also often accompanied by chrono-based methods and the emerging analysis tool of fractional calculus to provide timescale information. From both measurement techniques, mathematical approaches have been derived for estimating the effective capacitance by using the parameters of the ubiquitous constant phase element (CPE) in Cole impedance models. Nevertheless, there is a lack of global consensus on the ways in which capacitive properties of electrochemical materials should be assessed and reported. To address this issue, we here particularize the theoretical models developed in the most famous references of the CPE to provide numerical approximations on the total capacitance of this anomalous element through the non-parametric procedure of the distribution of relaxation times (DRT). We here draw parallels between the above-mentioned methods, indicating how one can estimate a real capacitance for the case of normal time-constant distributions. The current impulse-response function reveals that DRT and fractional calculus converge in capturing the adequate time scale to numerically estimate the total capacitive information about the electrochemical system dynamics, as well as the impedance does in the high-frequency region. Our work seeks to expand the concept of real capacitance and, in turn, provide an advanced strategy for connecting the current-controlled analytical techniques of IS, DRT and chronoamperometric experiments to clear the conscience of the electrochemistry community in the use and interpretation of CPEs.
{"title":"A full capacitive picture of the constant phase element: Estimations from impedance spectroscopy, distribution of relaxation times and fractional calculus","authors":"Enrique H. Balaguera","doi":"10.1016/j.elecom.2025.108053","DOIUrl":"10.1016/j.elecom.2025.108053","url":null,"abstract":"<div><div>Impedance spectroscopy (IS) is classically used to study the dynamical properties of electrochemical systems but now is also often accompanied by chrono-based methods and the emerging analysis tool of fractional calculus to provide timescale information. From both measurement techniques, mathematical approaches have been derived for estimating the effective capacitance by using the parameters of the ubiquitous constant phase element (CPE) in Cole impedance models. Nevertheless, there is a lack of global consensus on the ways in which capacitive properties of electrochemical materials should be assessed and reported. To address this issue, we here particularize the theoretical models developed in the most famous references of the CPE to provide numerical approximations on the total capacitance of this anomalous element through the non-parametric procedure of the distribution of relaxation times (DRT). We here draw parallels between the above-mentioned methods, indicating how one can estimate a real capacitance for the case of normal time-constant distributions. The current impulse-response function reveals that DRT and fractional calculus converge in capturing the adequate time scale to numerically estimate the total capacitive information about the electrochemical system dynamics, as well as the impedance does in the high-frequency region. Our work seeks to expand the concept of real capacitance and, in turn, provide an advanced strategy for connecting the current-controlled analytical techniques of IS, DRT and chronoamperometric experiments to clear the conscience of the electrochemistry community in the use and interpretation of CPEs.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108053"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145320650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-30DOI: 10.1016/j.elecom.2025.108054
Sreya Babu Nambiar , Barbara Daffos , Julie Segalini , Patrice Simon , Pierre-Louis Taberna
In this work, we aim to explore the synergetic influence of the functionalization of the carbon electrode and that of the electrolyte pH on the charge storage mechanism by utilizing the technique of EQCM (Electrochemical Quartz Crystal Microbalance). A comparative analysis has been carried out on YP50 and o-YP50 (carbon with oxygen functionalities), which revealed crucial differences in the evolution of ionic contribution to charge storage under varying pH. A progression from anionic to cationic mechanism was observed with an increase in pH, depending on the isoelectric point of the carbon under study. A combination of TPD-MS (Temperature Programmed Desorption Mass Spectrometry) and EQCM was used to probe pH-dependent surface transformations occurring on the functionalized and non-functionalized carbon electrode during electrochemical cycling. The electrolyte pH governs the protonation state of the surface functional groups, which influences the charge on the electrode and hence the mechanism of charge storage.
{"title":"Probing the role of isoelectric point in charge storage mechanisms of functionalized carbon by electrochemical quartz crystal microbalance (EQCM)","authors":"Sreya Babu Nambiar , Barbara Daffos , Julie Segalini , Patrice Simon , Pierre-Louis Taberna","doi":"10.1016/j.elecom.2025.108054","DOIUrl":"10.1016/j.elecom.2025.108054","url":null,"abstract":"<div><div>In this work, we aim to explore the synergetic influence of the functionalization of the carbon electrode and that of the electrolyte pH on the charge storage mechanism by utilizing the technique of EQCM (Electrochemical Quartz Crystal Microbalance). A comparative analysis has been carried out on YP50 and o-YP50 (carbon with oxygen functionalities), which revealed crucial differences in the evolution of ionic contribution to charge storage under varying pH. A progression from anionic to cationic mechanism was observed with an increase in pH, depending on the isoelectric point of the carbon under study. A combination of TPD-MS (Temperature Programmed Desorption Mass Spectrometry) and EQCM was used to probe pH-dependent surface transformations occurring on the functionalized and non-functionalized carbon electrode during electrochemical cycling. The electrolyte pH governs the protonation state of the surface functional groups, which influences the charge on the electrode and hence the mechanism of charge storage.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108054"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145263015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In-doped BaCoO3–δ (BaCo1–xInxO3–δ, x = 0, 0.10, 0.15; denoted BC, BCI10, BCI15) were synthesized via solid-state reaction. 15 mol% In3+ doping stabilized the cubic phase and improved thermal expansion stability. Even 10 mol% In3+ significantly enhanced oxygen reduction reaction activity, likely by favourably modifying the cobalt oxidation state within the cubic structure, thereby improving oxygen surface exchange. Symmetrical cells with BCI10 and BCI15 cathodes exhibited low area-specific resistances of 0.107 Ω cm2 and 0.139 Ω cm2, respectively, at 650 °C. These results demonstrate that In3+ doping produces highly promising cathodes for solid oxide fuel cells.
Pub Date : 2025-11-01Epub Date: 2025-09-24DOI: 10.1016/j.elecom.2025.108049
Ba Long Nguyen , Vladislav Ivanistsev
The electric double layer (EDL) – arguably the central concept in electrochemistry – remains the nut everyone wants to crack to tune its properties and, thus, control the performance of electrochemical devices. One such property is the differential capacitance that determines the energy density in supercapacitors. In this communication, we show that the capacitance–potential dependence can be fitted with a four-parameter model for ionic liquid–electrode interfaces, where steric packing naturally results in a power-law scaling. First, we demonstrate how these parameters can be evaluated and used to interpret the EDL structure and properties. Second, we demonstrate how the model enables predictions of both differential capacitance and energy density.
{"title":"Ionic liquid–electrode interface: From one law to fit them all to one model to predict them all","authors":"Ba Long Nguyen , Vladislav Ivanistsev","doi":"10.1016/j.elecom.2025.108049","DOIUrl":"10.1016/j.elecom.2025.108049","url":null,"abstract":"<div><div>The electric double layer (EDL) – arguably the central concept in electrochemistry – remains the nut everyone wants to crack to tune its properties and, thus, control the performance of electrochemical devices. One such property is the differential capacitance that determines the energy density in supercapacitors. In this communication, we show that the capacitance–potential dependence can be fitted with a four-parameter model for ionic liquid–electrode interfaces, where steric packing naturally results in a power-law scaling. First, we demonstrate how these parameters can be evaluated and used to interpret the EDL structure and properties. Second, we demonstrate how the model enables predictions of both differential capacitance and energy density.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108049"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-23DOI: 10.1016/j.elecom.2025.108055
Jing Yao , Anqi Zhao , Luning Wang
In this work, zinc oxide (ZnO) nanotubular arrays were fabricated on the surface of zinc‑bismuth (Znbi) alloys with different bismuth contents (0.5, 1, 1.5, and 2 wt%) using an anodization technique. The influence of bismuth content on the morphology of the ZnO nanotubular arrays was explored. By optimizing anodization parameters in an electrolyte containing 50 mM sodium bicarbonate, ethylene glycol, and volume ratio of water to ethylene glycol is 9:1. ZnO nanotubular arrays with uniform nanotubular diameters (395.2 ± 53.6 nm) were synthesized on the zinc surface. The increasing of content of bismuth reduced the average nanotubular diameter from 487.2 ± 54.2 nm for ZnO (Zn-0.5Bi) to 293.4 ± 26.5 nm for ZnO (Zn2Bi). When used as an anode, the anodized Znbi alloy demonstrated good cycling stability in aqueous zinc-ion battery, maintaining a capacity of 95.04 mAh g−1 after 1000 cycles at 1 a g−1. The anodized Znbi electrode also exhibited excellent cycling stability in a symmetric cell, with an overpotential of only 28.5 mV at 1 mA cm−2. This work provides a promising protocol for designing highly stable zinc-based anodes
在这项工作中，采用阳极氧化技术在不同铋含量（0.5、1、1.5和2 wt%）的锌铋（Znbi）合金表面制备了氧化锌（ZnO）纳米管阵列。探讨了铋含量对ZnO纳米管阵列形貌的影响。通过优化阳极氧化参数，电解液中含有50mm碳酸氢钠和乙二醇，水与乙二醇的体积比为9:1。在锌表面合成了直径均匀（395.2±53.6 nm）的ZnO纳米管阵列。随着铋含量的增加，ZnO （Zn-0.5Bi）的平均纳米管直径从487.2±54.2 nm降低到293.4±26.5 nm。阳极氧化后的Znbi合金在水溶液锌离子电池中表现出良好的循环稳定性，在1 a g−1下循环1000次后，其容量保持在95.04 mAh g−1。阳极氧化的锌铋电极在对称电池中也表现出良好的循环稳定性，在1ma cm−2时过电位仅为28.5 mV。这项工作为设计高稳定性的锌基阳极提供了一种有前途的方案
{"title":"Fabrication zinc oxide nanotubular arrays on the surface of zinc‑bismuth alloy for high-performance aqueous zinc-ion battery anodes","authors":"Jing Yao , Anqi Zhao , Luning Wang","doi":"10.1016/j.elecom.2025.108055","DOIUrl":"10.1016/j.elecom.2025.108055","url":null,"abstract":"<div><div>In this work, zinc oxide (ZnO) nanotubular arrays were fabricated on the surface of zinc‑bismuth (Zn<img>bi) alloys with different bismuth contents (0.5, 1, 1.5, and 2 wt%) using an anodization technique. The influence of bismuth content on the morphology of the ZnO nanotubular arrays was explored. By optimizing anodization parameters in an electrolyte containing 50 mM sodium bicarbonate, ethylene glycol, and volume ratio of water to ethylene glycol is 9:1. ZnO nanotubular arrays with uniform nanotubular diameters (395.2 ± 53.6 nm) were synthesized on the zinc surface. The increasing of content of bismuth reduced the average nanotubular diameter from 487.2 ± 54.2 nm for ZnO (Zn-0.5Bi) to 293.4 ± 26.5 nm for ZnO (Zn<img>2Bi). When used as an anode, the anodized Zn<img>bi alloy demonstrated good cycling stability in aqueous zinc-ion battery, maintaining a capacity of 95.04 mAh g<sup>−1</sup> after 1000 cycles at 1 a g<sup>−1</sup>. The anodized Zn<img>bi electrode also exhibited excellent cycling stability in a symmetric cell, with an overpotential of only 28.5 mV at 1 mA cm<sup>−2</sup>. This work provides a promising protocol for designing highly stable zinc-based anodes</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"180 ","pages":"Article 108055"},"PeriodicalIF":4.2,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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