Journal of Electroanalytical Chemistry最新文献

{"title":"Evaluation of the surface activity of silicon in electrolytic media under the influence of hydroxyl radicals","authors":"C. Heyser ,&nbsp;A.M.R. Ramírez ,&nbsp;P. Grez ,&nbsp;E. Muñoz ,&nbsp;A. Sáez-Arteaga ,&nbsp;N. Briones ,&nbsp;P. Häberle","doi":"10.1016/j.jelechem.2025.119010","DOIUrl":"10.1016/j.jelechem.2025.119010","url":null,"abstract":"<div><div>The purpose of this study is to evaluate the surface activity of silicon by evaluating a voltammetric profile of the substrate in an electrolytic medium. Since the electrical current flowing through the circuit is a measure of the rate at which a redox process occurs at the interface, higher current values will indicate more active substrates. For this study, hydroxyl radicals were generated by photochemical decomposition of H₂O₂. For this purpose, a H₂O₂ solution was irradiated with a UV lamp. The experimental conditions that were varied in the process were: illumination time, H₂O₂ concentration. The presence of the hydroxyl radicals generated through the methodology employed was qualitatively confirmed by fluorescence, using for this purpose (i) a 2′,7′-dichlorodihydrofluorescein diacetate (DCFH-DA) probe and (ii) a “radical scavenger”, which corresponds to an antioxidant species, in this case ascorbic acid. On the other hand, for the voltammetric measurements of the semiconducting substrate after interaction with hydroxyl radicals, a 0,1 M KCl solution was used as electrolyte solution. The experimental conditions studied were: influence of the pH of the medium and influence of different chemical treatments applied to the substrates used after interaction with hydroxyl radicals. From the results obtained, an increase in both_H2O2 concentration and immersion time produces an increase in current in the interphase electrode processes, indicating an activation of the semiconductor electrode surface. Indeed, in the anodic hemicycle, the signal of substrate oxidation appears at −0,75 V, and then from −0,45 V onwards, the oxidation of water. This is an indication that the semiconductor/electrolyte interface is ohmic, since in the absence of illumination (absence of minority carriers, h⁺) there are oxidation processes. On the other hand, for pH values in the intervals between 2 &gt; pH &gt; 5 and 7 &gt; pH &gt; 13, the slopes are approximately 0 mV/pH and for the interval between 5 &gt; pH &gt; 7, of the order of 60 mV/pH, this being an indication of a change in the nature of the surface functional groups of silicon.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119010"},"PeriodicalIF":4.1,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436670","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}

{"title":"Electrochemical characterization of reduced TiO2 thin films in acetonitrile electrolytes","authors":"Gustavo Escobar-Abril,&nbsp;Juliana V. Díaz-Reyes,&nbsp;Luis C. Moreno-Aldana,&nbsp;Marco F. Suárez-Herrera","doi":"10.1016/j.jelechem.2025.119012","DOIUrl":"10.1016/j.jelechem.2025.119012","url":null,"abstract":"<div><div>The synthesis of reduced TiO₂ is usually achieved under an H₂ atmosphere at high temperatures and pressures. In this work, we report a new electrochemical method that allow the reduction of TiO₂-P25 in soft conditions by applying pulses of potential using an acetonitrile-containing electrolyte saturated with H₂. The reduction of TiO₂ and intercalation of H⁺ were more effective at very low concentrations of water in acetonitrile and in the presence of hydrophobic electrolytes such as tetrabutylammonium hexafluorophosphate. Raman spectroscopy confirms the insertion of H⁺ during the reduction of TiO₂. The reduced TiO₂-P25 showed a five-fold increase in photocurrents in comparison with pristine TiO₂-P25. AC voltammetry and electrochemical impedance spectroscopy provided valuable information to analyze the structure of the conduction band, the electron transfer kinetics, and the electron transport through the TiO₂ film. Finally, the stability of reduced TiO₂ under oxidizing potentials was studied.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119012"},"PeriodicalIF":4.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoelectrocatalytic highly selective oxidation of glycerol to C3 products on Mo:BiVO4/NiOOH photoanodes","authors":"Haomin Gong ,&nbsp;Rufeng Tian ,&nbsp;Lu Niu ,&nbsp;Yan Sun ,&nbsp;Wanggang Zhang ,&nbsp;Aili Wei ,&nbsp;Jian Wang ,&nbsp;Yiming Liu","doi":"10.1016/j.jelechem.2025.119019","DOIUrl":"10.1016/j.jelechem.2025.119019","url":null,"abstract":"<div><div>The extensive adoption of biomass diesel has resulted in a notable increase in glycerol production as a by-product, thereby underscoring the significance of glycerol oxidation into high-value derivatives. This research focuses on the development of NiOOH-modified Molybdenum-doped Bismuth vanadate (Mo:BiVO₄/NiOOH) photoanodes for the purpose of glycerol oxidation. The results indicate that the Mo:BiVO₄/NiOOH configuration markedly improves the efficiency of electron-hole separation. Through adsorption and desorption experiments, it was observed that the Mo:BiVO₄/NiOOH photoanode demonstrates a low affinity for glyceraldehyde (GLAD) and 1,3-dihydroxyacetone (DHA), thereby facilitating their desorption from the surface. Mechanistic studies revealed that the surface of the Mo:BiVO₄/NiOOH photoanode generates carbon and hydroxyl radicals via holes. The hydroxyl group subsequently oxidizes the carbon radical, leading to the formation of GLAD and DHA. In this study, the synergistic effect of NiOOH loading and Mo doping on BiVO₄ was analyzed, and a photoanode with high selectivity in the glycerol conversion process was prepared, which provided important support for the progress of photoelectrocatalytic glycerol conversion.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119019"},"PeriodicalIF":4.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436667","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}

{"title":"Diffusive/ capacitive controlled process in solid-state proton batteries utilizing Gellan gum based biopolymer electrolytes: A synergetic study through cyclic voltammetry","authors":"Meera Naachiyar Ramadhasan ,&nbsp;Ragam M ,&nbsp;Selvasekarapandian S","doi":"10.1016/j.jelechem.2025.119011","DOIUrl":"10.1016/j.jelechem.2025.119011","url":null,"abstract":"<div><div>This research examines the performance of solid-state proton batteries utilizing biopolymer Gellan gum (GG) as the host polymer matrix through cyclic voltammetry analysis. Ammonium salts such as NH₄SCN, NH₄HCO₂, NH₄I and NH₄NO₃ are integrated as proton donors to assess their distinct electrochemical properties through CV analysis. The findings reveal that the GG-based batteries highlight a combination of diffusion-controlled and surface-limited reactions, which are influenced by the intrinsic solid-state structure and the anionic properties of the salts. This work emphasizes the potential of GG-based polymer electrolytes in energy storage, showcasing their versatility and tenability for clean energy applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119011"},"PeriodicalIF":4.1,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445643","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}

{"title":"Sensitive detection of α-Fetoprotein using an electrochemiluminescence sensor combining molecular imprinting and aptamer recognition on a graphite carbon nitride/polypyrrole platform","authors":"Jie Wang ,&nbsp;Mu Yang ,&nbsp;Yuxuan Chen ,&nbsp;Shouren Li ,&nbsp;Yingdan He ,&nbsp;Songmei Wu ,&nbsp;Yu Yu ,&nbsp;Kejian Ding","doi":"10.1016/j.jelechem.2025.119008","DOIUrl":"10.1016/j.jelechem.2025.119008","url":null,"abstract":"<div><div>An electrochemiluminescence (ECL) sensor was successfully developed to detect trace amounts of α-fetoprotein (AFP) by combining molecular imprinting (MIP) and nucleic acid aptamer (APT) recognition methods, using graphitic carbon nitride (GCN) and polypyrrole (PPy). The heterojunction material increased the likelihood of more electrons being involved in the ECL detection, improving the sensor’s reliability, stability, and durability. Additionally, the combined techniques strengthened the AFP molecules’ binding to the electrode surface. Under optimal conditions, the sensor had a wide detection range from 10⁻¹¹ µg/mL to 10⁻⁵ µg/mL, with a detection limit (LOD) as low as 10⁻11 µg/mL (S/N = 3). Tests with real samples confirmed the sensor’s high reliability and feasibility.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119008"},"PeriodicalIF":4.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402910","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}

{"title":"N-doped VS2 cathode with shell-anchored structure for enhancing the storage performance of Zn-Ion batteries","authors":"Rongguan Lv,&nbsp;Mohan Yue,&nbsp;Yi Zhang,&nbsp;Lin He,&nbsp;Huayu Wu,&nbsp;Yu Liu,&nbsp;Jindi Wang,&nbsp;Yingna Chang,&nbsp;Kefan Song,&nbsp;Rong Xing","doi":"10.1016/j.jelechem.2025.119007","DOIUrl":"10.1016/j.jelechem.2025.119007","url":null,"abstract":"<div><div>Using a confinement growth strategy, shell-anchored <em>N</em>-doped (NSA) VS₂ has been synthesized within hollow mesoporous carbon spheres as a cathode material in aqueous zinc ion batteries (ZIBs). The VS₂@NSA composite exhibits a novel three-step deintercalation process across a broad voltage range (0–1 V), significantly boosting Zn²⁺ storage capacity. Notably, the shell-anchored structure of VS₂@NSA effectively mitigates the pulverization and volume expansion issues associated with extensive Zn²⁺ insertion. Furthermore, VS₂@NSA exhibited the excellent cycle stability of 282.4 mA h/g at 1 A/g after 500 cycles. Massive Zn²⁺ insertion did not cause excessive volume variation and structure destruction that can be effectively inhibited by the confined structure of VS₂@NSA.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"982 ","pages":"Article 119007"},"PeriodicalIF":4.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430044","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}

{"title":"Electrochemical dissolution behavior and characterisation of passivation films of PH13-8Mo in NaNO3","authors":"Li Ying,&nbsp;Zeng Yongbin,&nbsp;Zhang Rudong,&nbsp;Li Yanliang","doi":"10.1016/j.jelechem.2025.119004","DOIUrl":"10.1016/j.jelechem.2025.119004","url":null,"abstract":"<div><div>PH13-8Mo stainless steel, renowned for its superior physical and mechanical properties due to advanced smelting processes, is widely employed in high-stakes aerospace applications, including nuclear energy systems, rocketry, and critical aerospace components. However, its high strength and hardness present challenges in machining, especially for intricate structural shapes. This study investigates the electrochemical machining (ECM) of PH13-8Mo, emphasizing its dissolution characteristics and the behavior of key constituent elements—iron (Fe), chromium (Cr), nickel (Ni), molybdenum (Mo), and aluminum (Al)—in corrosion processes. Techniques such as open circuit potential (OCP), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) were employed to characterize each element’s contribution to passivation. Morphological analysis indicated that residual surface austenite dissolves progressively with increased current density, exposing the underlying martensitic phase. Post-dissolution EIS analysis revealed that Fe and Ni facilitate secondary passivation, whereas Mo significantly enhances passivation film density. A mechanistic dissolution model is proposed to elucidate the progressive dissolution behavior of PH13-8Mo.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119004"},"PeriodicalIF":4.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395936","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}

{"title":"Heteroatoms-doped porous carbon microspheres derived from cyclotriphosphazene based materials for high performance supercapacitors","authors":"Muhammad Waqar Hameed ,&nbsp;Abdul Majid Khan ,&nbsp;Zahid Ali ,&nbsp;Sahrish Majeed ,&nbsp;Yasir Abbas ,&nbsp;Wei Liu ,&nbsp;Guang-Xin Chen ,&nbsp;Teng Zhang ,&nbsp;Zhanpeng Wu","doi":"10.1016/j.jelechem.2025.119006","DOIUrl":"10.1016/j.jelechem.2025.119006","url":null,"abstract":"<div><div>Poly-phosphazenes have emerged as a significant category of organic and inorganic composite materials, that can produce efficient co-doped carbons materials for supercapacitors electrode. In this study, the nitrogen and phosphorus rich cyclotriphosphazene-<em>co</em>-1,5-naphthalene diamine microspheres (CTPND-MS) with tailored properties were synthesized by carbonization of carbon precursor. Micro and mesoporous mixed carbon microspheres (CMS) with high specific surface areas were obtained by varying the heating rates during carbonization: 2 °C min⁻¹ (CTPND-MS2), 5 °C min⁻¹ (CTPND-MS5) and 10 °C min⁻¹ (CTPND-MS10). Among these, CTPND-MS2 demonstrated the highest specific surface area of 749.12 m²/g, with approximately 4.64–5.19 % heteroatom content. This high specific surface area and intrinsically N, P dual doped activated carbon microspheres exhibited a specific gravimetric capacitance of 232.0 F g⁻¹ at current density of 0.1 A/g in a 1 M H₂SO₄ electrolyte in symmetric dual electrode capacitor. CTPND-MS2 demonstrated 98 % cycling stability after 10,000th galvanostatic charge–discharge (GCD) cycles at current density of 5 A/g. Additionally, co-doped microspheres achieved energy density of 8.06 Wh kg⁻¹, at a power density of 24.99 Wh kg⁻¹, at 0.1 A/g. The results establish that phosphazene based materials exhibits an excellent potential for the development of high-performance supercapacitors electrode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119006"},"PeriodicalIF":4.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396020","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}

{"title":"Effect of single-atom palladium on the anti-toxicity of electrocatalytic reduction removal of nitrate-nitrogen","authors":"Wenqian Li ,&nbsp;Huiling Jiang ,&nbsp;Jing Liang ,&nbsp;Zongqiang Zhu ,&nbsp;Yinming Fan","doi":"10.1016/j.jelechem.2025.119003","DOIUrl":"10.1016/j.jelechem.2025.119003","url":null,"abstract":"<div><div>The enhancement of palladium-based catalysts’ resistance to sulfide toxicity was pursued through the synthesis of six catalysts, namely PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, Cu MOF₁₀₀₀, PdCu MOF₅₀₀, Pd MOF₅₀₀, and Cu MOF₅₀₀, employing a hydrothermal method. The study delved into the catalytic reduction capabilities of these six catalysts with respect to nitrate (NO₃-N), alongside exploring the impact of sodium sulfite on the catalytic activities of PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, and Cu MOF₁₀₀₀. Notably, at a NO₃-N concentration of 50 mg/L, significant removal efficacy was observed for PdCu MOF₁₀₀₀, Pd MOF₁₀₀₀, and Cu MOF₁₀₀₀, with PdCu MOF₁₀₀₀ exhibiting a high nitrate removal rate of 97.8 %. Upon the addition of 200 μM sodium sulfite to the system, the removal efficiency of PdCu MOF₁₀₀₀ was still high at 93.3 %, while a reduction in the removal rate of NO₃-N by Pd MOF₁₀₀₀ was observed. Quenching experiments confirmed the presence of hydrogen radicals (H*) in the reaction system, thereby facilitating the indirect-electrocatalytic reduction of nitrate. This observation suggests that catalysts containing Pd single atoms show promise in enhancing their resilience to sulfide toxicity.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"983 ","pages":"Article 119003"},"PeriodicalIF":4.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453918","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}

{"title":"Reduction of uranium (VI) in water with additive manufactured electrode","authors":"Florent Belnou ,&nbsp;Michel L. Schlegel ,&nbsp;Thomas Proslier ,&nbsp;Julie Mayounove ,&nbsp;Hicham Maskrot","doi":"10.1016/j.jelechem.2025.119005","DOIUrl":"10.1016/j.jelechem.2025.119005","url":null,"abstract":"<div><div>Nuclear energy has a promising future, but conventional uranium resources are expected to be depleted within a century. Electrochemical extraction could overcome this roadblock by quantitatively recovering uranium dissolved in natural waters using high surface-area electrodes. In this paper, 3D-architected electrodes were manufactured and studied in an electrochemical cell for element extraction. First, untreated flat electrodes made by Laser Powder Bed Fusion (LPBF) and studied by Cyclic Voltammetry (CV) with a custom electrochemical flow cell in a solution of 1 mM Fe(III)(CN)₆³⁻, 0.1 M KCl have exhibited a shift in redox waves because of an oxidized surface. After electro-etching of the electrode surface with oxalic acid, CV exhibited wave positions closer to literature values with higher amplitudes. However, with a solution of 10⁻³ M uranium, 0.1 M NaCl with a pH of 2.3, no electrochemical signals were detected. In contrast, uranium electrochemically reacted with, and was quantitatively retained by an electrode coated with 10 nm of TiO₂ by Atomic Layer Deposition (ALD), and the electrode surface was able to retain uranium by chronoamperometry (CA) (about 0.5 mg for a surface of 3.0 cm²). To increase the reacting surface, 3D-architected electrodes were manufactured, electro-etched and TiO₂-coated. These electrodes showed a tenfold increase in uranium retention (up to 5.7 mg for a surface of 111.1 cm²) that could be partially re-dissolved in a new solution with a yield of 70 %. This work shows the interest of both surface functionalization and architected electrodes for elemental retention.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"981 ","pages":"Article 119005"},"PeriodicalIF":4.1,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396000","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}