Jiafeng Meng , Lina Dong , Nana Mei , Hui Lin , Hui Xu , Ying Yu
{"title":"Preparation of Sargassum thunbergii derived porous carbon with enhanced capacitance performance: Synergistic effect of activating agent and CaCO3","authors":"Jiafeng Meng , Lina Dong , Nana Mei , Hui Lin , Hui Xu , Ying Yu","doi":"10.1016/j.ijoes.2025.101097","DOIUrl":"10.1016/j.ijoes.2025.101097","url":null,"abstract":"<div><div>A sustainable one-pot carbonization method has been designed to synthesize micro/meso hierarchical porous carbon. Hierarchically porous carbon with superior electrochemical capacitance and cycling stability was synthesized through the carbonization of Sargassum thunbergii biomass, employing K₂C₂O₄ as a chemical activator and waste eggshell-derived CaCO₃ nanoparticles as a hard template. The effects of K<sub>2</sub>C<sub>2</sub>O<sub>2</sub> activator dosage on the morphology, microstructure, and graphitization degree of porous carbon were systematically investigated under isothermal conditions. S<sub>BET</sub> (specific surface area) of the obtained porous carbon ranges from 496.42 to 1246.33 m<sup>2</sup>∙g<sup>−1</sup>, and the pore size is mainly distributed in the range of 0.5–5 nm. The sample STEK-2 prepared at an activation temperature of 700 °C with a mass ratio of 1:1:3 for Sargassum thunbergii, CaCO<sub>3</sub>, and K<sub>2</sub>C<sub>2</sub>O<sub>4</sub> has the highest S<sub>BET</sub> and V<sub>total</sub> (total pore volume). The STEK-2 electrode obtained a specific capacitance of 299 F∙g<sup>−1</sup> in a three-electrode system in 6 M KOH electrolyte. When it was assembled as symmetric supercapacitors using STEK-2, the capacitance can maintain 97 % of the initial value after 10,000 cycles at a current density of 3 A∙g<sup>−1</sup>.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101097"},"PeriodicalIF":1.3,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Flexible electrochemical aptasensor for non-invasive potassium detection in human sweat","authors":"Shouhan Ji","doi":"10.1016/j.ijoes.2025.101095","DOIUrl":"10.1016/j.ijoes.2025.101095","url":null,"abstract":"<div><div>This study presents a flexible electrochemical aptasensor designed for non-invasive potassium ion detection in human sweat, enabling real-time assessment during physical exertion. A gold thin-film electrode was functionalized with a thiolated, guanine-rich DNA aptamer bearing a ferrocene label, which produced a signal-on response upon K⁺ binding. Morphological (SEM, AFM) and chemical (XPS) analyses confirmed successful surface modification and aptamer immobilization. Electrochemical characterization using cyclic voltammetry and impedance spectroscopy revealed a marked increase in charge transfer resistance following aptamer assembly (from 520 Ω to 3960 Ω), with partial recovery (to 2410 Ω) after K⁺ exposure. Square wave voltammetry exhibited a linear detection range from 0.5 nM to 100 µM (R² = 0.996), a sensitivity of 1.73 µA per log[K⁺], and a detection limit of 0.12 nM. Selectivity studies showed over 85 % signal suppression for interfering ions (Na⁺, Ca²⁺, Mg²⁺, Zn²⁺, NH₄⁺). Human sweat validation demonstrated recovery rates between 96.2 % and 103.0 %, with RSDs under 4.1 %. Mechanical and environmental durability tests confirmed 89.6 % signal retention after 7 days of ambient storage and 6.3 % signal drift over 5 h of continuous operation. These findings highlight the sensor’s robustness, specificity, and practical suitability for wearable bioelectronic platforms.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101095"},"PeriodicalIF":1.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yujie Tan , Jin Ma , Hongwen Tao , Yuanqiang Hao , Peisheng Zhang , Rongjin Zeng , Shu Chen
{"title":"An alternative method for anodic electropolymerization of polymelamine in water-free deep eutectic solvents","authors":"Yujie Tan , Jin Ma , Hongwen Tao , Yuanqiang Hao , Peisheng Zhang , Rongjin Zeng , Shu Chen","doi":"10.1016/j.ijoes.2025.101096","DOIUrl":"10.1016/j.ijoes.2025.101096","url":null,"abstract":"<div><div>In our previous study (Electrocatalysis 15: 394–400, 2024), we proposed a method for preparing polymelamine (pMel) by adding a small amount of water to deep eutectic solvents (DES). However, electropolymerization under completely anhydrous conditions has not yet been achieved. This study experimentally identified that the main challenges in electropolymerizing melamine in anhydrous DES solutions are the low concentration of melamine monomer used in current literature and the slow diffusion rate in DES. These factors lead to the rapid depletion of melamine monomer in the electrode-solution interface diffusion layer by electro-generated active chlorine, ultimately preventing the effective deposition of pMel films. By leveraging the high solubility of melamine in DES, we successfully achieved pMel synthesis under anhydrous conditions in Ethaline and Glyceline by appropriately increasing the melamine monomer concentration or applying stirring. The formation process and morphological structure of the pMel deposition layer were confirmed using cyclic voltammetry (CV), quartz crystal microbalance (EQCM), and atomic force microscopy (AFM).</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101096"},"PeriodicalIF":1.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Influence of sintering time on structure and electrochemical properties of La2MgNi9 hydrogen storage alloys","authors":"Chenyao Liu, Fansong Wei, Yuyang Zhou, Huixin Liu","doi":"10.1016/j.ijoes.2025.101094","DOIUrl":"10.1016/j.ijoes.2025.101094","url":null,"abstract":"<div><div>LaNi<sub>2.3</sub> and MgNi<sub>1.55</sub> intermediate alloys were used to prepare the La<sub>2</sub>MgNi<sub>9</sub> alloy by vacuum powder sintering at 800 °C, and the effects of sintering time (2 h, 4 h, 6 h and 8 h) on the phase structure and electrochemical properties of La<sub>2</sub>MgNi<sub>9</sub> hydrogen storage alloy were investigated systematically. The results show that the alloys consist of La<sub>2</sub>MgNi<sub>9</sub> phase, (La, Mg)<sub>2</sub>Ni<sub>7</sub> phase and LaNi<sub>5</sub> phase, and prolonging of sintering time can promote the formation of the LaNi<sub>5</sub> phase. It was found that appropriate sintering time can significantly enhance the maximum discharge capacity (<em>C</em><sub><em>max</em></sub>) and improve the cycling stability (<em>S</em><sub><em>50</em></sub>) as well as the high-rate dischargeability (<em>HRD</em>) of the alloy. For example, the alloy sintered for 4 h exhibits the best electrochemical performance with <em>C</em><sub><em>max</em></sub> = 365.04 mAh/g, <em>S</em><sub><em>50</em></sub> = 73.62 % and <em>HRD</em><sub><em>900</em></sub> = 88.43 %. Analysis indicates that the larger cell volume, the lower pressure of the hydrogen release platform, and then the alloy sintered for 4 h showed the largest hydrogen storage in the alloy. The improvement of cycle life of the alloy was due to more homogeneous composition and higher resistance to pulverization. The electrothermal tests showed that <em>HRD</em> is mainly controlled by the surface charge transfer rate of the alloy electrodes.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101094"},"PeriodicalIF":1.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shujun Chen , Siyi Chen , Yang Liu , Hai Zhang , Yuanhui Wu , Zhisuo Yan
{"title":"Exploration of Metaplexis hemsleyana leaves extract as an eco-friendly corrosion inhibitor for Q420-steel in HCl media","authors":"Shujun Chen , Siyi Chen , Yang Liu , Hai Zhang , Yuanhui Wu , Zhisuo Yan","doi":"10.1016/j.ijoes.2025.101088","DOIUrl":"10.1016/j.ijoes.2025.101088","url":null,"abstract":"<div><div>Effective prevention of metal corrosion has become an urgent and significant issue, which necessitates the development of innovative inhibitors with environmental benignity, cost-effectiveness, highly efficient, and high aqueous solubility. Herein, metaplexis hemsleyana leaves extract (MHE) was prepared by a simple water-based extraction method and employed as an eco-friendly inhibitor with high inhibition efficiency for Q420 steel in 1 M HCl solutions. Fourier transform infrared (FT-IR) and ultraviolet-visible (UV–vis) spectroscopies were conducted to explore the active inhibitory components existing in MHE. Systematic electrochemical tests and morphological examinations were carried out to investigate the anti-corrosion performance of MHE, and the results indicate that MHE is a mixed-type inhibitor with an inhibition efficiency of 92.86 % at the concentration of 0.8 g/ L. This high efficiency is attributed to the formation of a protective layer on the mild steel surface, which blocking the diffusion pathways of aggressive ions, thereby reducing corrosion. The Langmuir adsorption isotherm reveals that the Gibbs free energy is −20.96 kJ/mol, which suggests that MHE can adsorb spontaneously onto the steel surfaces. Furthermore, quantum chemical calculations and molecular dynamics simulations were performed to establish the relationship between the electronic structures of MHE and corrosion inhibition effectiveness and explore the detailed corrosion inhibitive behavior of MHE.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101088"},"PeriodicalIF":1.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144279944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electrochemical detection of cortisol using a molecularly imprinted Au-decorated SiC/β-cyclodextrin nanocomposite sensor in human sweat","authors":"Yan Hu, Tao Jiang","doi":"10.1016/j.ijoes.2025.101093","DOIUrl":"10.1016/j.ijoes.2025.101093","url":null,"abstract":"<div><div>The developed wearable electrochemical sensing platform demonstrates significant potential for continuous monitoring of cortisol in human sweat, a key biomarker for evaluating stress and fatigue levels in athletic performance. Utilizing a novel Au-decorated nanocomposite functionalized with β-cyclodextrin-assisted molecular recognition sites, this study outlines a systematic fabrication process where SiC nanoparticles are first oxidized and subsequently decorated with gold nanoparticles, achieving an average Au particle diameter of 5.3 ± 1.2 nm to enhance conductivity and electron transfer kinetics. The incorporation of dual amine-terminated β-cyclodextrin not only improves molecular recognition but also facilitates selective cortisol capture, as evidenced by sensitivity improvements to approximately 1.85 μF per ng/mL over a linear range of 5–45 ng/mL and a limit of detection as low as 2.8 ng/mL. Comprehensive electrochemical evaluations, including cyclic voltammetry, confirm the sensor’s ability to reliably distinguish cortisol from potential interferents, yielding selectivity coefficients between 18.3 and 31.0, with reproducibility demonstrated by relative standard deviations below 4.8 %. Real sweat sample analyses using a standard addition method provided a robust calibration curve (R² = 0.993), confirming effective quantification in complex biological matrices typical of athletic environments. Furthermore, the sensor exhibited excellent mechanical resilience, with a capacitance reduction of only 4 % after 20 bending cycles, and maintained stable performance over 30 days, indicating long-term durability suitable for wearable sports applications. This innovative approach integrates material design, surface chemistry, and device engineering to enable rapid, accurate, and noninvasive monitoring of athlete stress levels, offering a promising avenue for real-time physiological tracking during training and competitive performance.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 8","pages":"Article 101093"},"PeriodicalIF":1.3,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodrigo F.B. de Souza, Andrea S. Del Pozzo, Antonio D. Giuliano, Gabriel Silvestrin, Lorenzo De Micheli, Edson P. Soares, Claudia Giovedi, Luis A.A. Terremoto, Samir L. Somessari, Almir O. Neto, Wilson Calvo
{"title":"In-operando 3D visualization of nickel electrodeposition and mass transport phenomena: Insights from X-ray microcomputed tomography","authors":"Rodrigo F.B. de Souza, Andrea S. Del Pozzo, Antonio D. Giuliano, Gabriel Silvestrin, Lorenzo De Micheli, Edson P. Soares, Claudia Giovedi, Luis A.A. Terremoto, Samir L. Somessari, Almir O. Neto, Wilson Calvo","doi":"10.1016/j.ijoes.2025.101090","DOIUrl":"10.1016/j.ijoes.2025.101090","url":null,"abstract":"<div><div>Nickel electrodeposition is widely used in industrial applications due to its ability to enhance the mechanical and corrosion resistance of metallic substrates. However, understanding mass transport mechanisms during electrodeposition remains a challenge, as conventional models struggle to describe complex three-dimensional phenomena such as concentration gradients, depletion zones, and convective instabilities. In this study, we employ X-ray micro-computed tomography (X-ray µCT) <em>in-operando</em> imaging technique to investigate the electrodeposition of nickel on titanium under potentiostatic conditions. Chronoamperometric analysis and scanning electron microscopy (SEM) confirmed distinct deposition behaviors at −0.5 V and −1.2 V, with negligible deposition at the lower potential and significant nickel growth, including dendritic structures, at the higher potential. The X-ray µCT images revealed the formation of structured ionic layers near the electrode surfaces, with Ni²⁺ ion migration and concentration gradients influencing deposition dynamics. At −1.2 V, depletion zones and convective instabilities were identified, suggesting a competition between diffusion, migration, and Rayleigh-Bénard convection. These findings demonstrate the feasibility of X-ray µCT for real-time 3D visualization of electrochemical processes, providing novel insights into mass transport during electrodeposition.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 8","pages":"Article 101090"},"PeriodicalIF":1.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Miaomiao Zheng , Jialu Xu , Xiaohai Xu , Zhe Tang , Yutong Hou , Xinyu Li , Qinlong Li , Mohan Li , Dongfang Wei , Zhe Cao
{"title":"Medium-chain fatty acid production via microbial electrosynthesis: Mechanisms, progress, and prospects","authors":"Miaomiao Zheng , Jialu Xu , Xiaohai Xu , Zhe Tang , Yutong Hou , Xinyu Li , Qinlong Li , Mohan Li , Dongfang Wei , Zhe Cao","doi":"10.1016/j.ijoes.2025.101091","DOIUrl":"10.1016/j.ijoes.2025.101091","url":null,"abstract":"<div><div>Microbial electrosynthesis (MES) offers a sustainable bioelectrochemical platform for converting renewable electricity and carbon sources, particularly carbon dioxide, into value-added chemicals. Medium-chain fatty acids (MCFAs, C6–C12) are of growing industrial interest due to their versatile applications and potential for sustainable production independent of fossil resources. This review critically examines the biochemical pathways and electrochemical principles underlying MCFA synthesis in MES systems. It also evaluates key system components, including microbial catalysts (e.g., <em>Clostridium, Eubacterium</em>), advanced electrode materials, and innovative reactor designs such as flow-through and fluidized bed configurations. Performance benchmarks, including production rates, titers, selectivity, and energy efficiencies, are summarized to assess technological progress. Major challenges related to electron transfer limitations, competing biological pathways, mass transfer constraints, and economic scalability are discussed. Finally, this review outlines future research directions and highlights how interdisciplinary advancements in reactor engineering, metabolic optimization, and system integration can accelerate the transition of MES from laboratory studies to industrial-scale sustainable bioproduction.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 9","pages":"Article 101091"},"PeriodicalIF":1.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chongyang Li , Xuanye Liu , Hao Zhou , Yuanqiang Hao
{"title":"Recent advances in photoelectrochemical sensing of bisphenol A","authors":"Chongyang Li , Xuanye Liu , Hao Zhou , Yuanqiang Hao","doi":"10.1016/j.ijoes.2025.101089","DOIUrl":"10.1016/j.ijoes.2025.101089","url":null,"abstract":"<div><div>Bisphenol A (BPA), a widely used endocrine disruptor in plastics and consumer goods, poses serious environmental and health threats. Its widespread presence necessitates the development of sensitive, selective, and portable detection methods. Photoelectrochemical (PEC) sensing, combining optical excitation with electrochemical detection, offers distinct advantages such as low background, high sensitivity, and miniaturization potential for trace BPA analysis. In this review, we systematically summarize the latest progress of PEC sensing strategies for BPA detection, classified into three primary mechanisms: (i) direct PEC sensors utilizing the intrinsic electron-donating property of BPA to enhance photocurrent signals, (ii) aptamer-based PEC sensors integrating the high selectivity of aptamer recognition elements with photoactive nanomaterials, and (iii) molecularly imprinted PEC sensors employing artificial recognition cavities embedded in conductive polymers or inorganic semiconductor matrices. Detailed discussions on the sensing mechanisms, material synthesis, electrode construction, and performance evaluation are critically presented. Emphasis is placed on innovative approaches such as heterojunction engineering, visible-light-driven photoactive materials, and self-powered systems. Finally, current challenges and future research perspectives are highlighted. Continuous advancements are expected to significantly promote the practical deployment of PEC sensors for effective BPA monitoring in environmental and food safety applications.</div></div>","PeriodicalId":13872,"journal":{"name":"International Journal of Electrochemical Science","volume":"20 8","pages":"Article 101089"},"PeriodicalIF":1.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}