Electrochimica Acta最新文献

{"title":"Enhancing stable and rapid Li+/Na+ storage performance via interface engineering of confining Co3S₄/1T-MoS₂ heterostructure on nitrogen-doped carbon","authors":"Shou-Cong Dong ,&nbsp;Rui Zeng ,&nbsp;Hao Zhang ,&nbsp;Shu-Ting Zhang ,&nbsp;Pei-Pei Chen ,&nbsp;Dong-Lin Zhao","doi":"10.1016/j.electacta.2025.147415","DOIUrl":"10.1016/j.electacta.2025.147415","url":null,"abstract":"<div><div>Transition metal sulfides (TMSs) exhibit high theoretical capacity as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). However, their practical application is severely hindered by poor cycling stability. In this study, Co₃S₄/1T-MoS₂ heterostructure was confined on nitrogen-doped carbon nanosheets composite (Co₃S₄/1T-MoS₂@NC) by high-temperature pyrolysis and hydrothermal sulfidation, using ZIF-67 as the precursor, modulated by a small-molecule carbon source. The heterostructure between Co₃S₄ and 1T-MoS₂ synergistically enhances the electrical conductivity and rapid diffusion kinetics. The aggregation of MoS₂ nanosheets at the interface effectively enhances the electrochemical performance of the material, while the nitrogen-doped carbon generated at the interface provides additional active sites. This interface engineering and the formation of heterostructures endow the material with improved ion storage capabilities. The composite remains high specific capacities of 1192.2 mAh g⁻¹ for LIBs and 615.3 mAh g^-1 for SIBs after 100 cycles at 0.1 A g^-1. The combination of enhanced charge transport and structural stability highlights the potential of the heterostructure strategy for next-generation high-performance alkali metal-ion batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147415"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatially confined atomic manganese in N-doped carbon for oxygen reduction in Zn-air batteries","authors":"Wang Xiang ,&nbsp;Haizhou Yu ,&nbsp;Lingling Wang ,&nbsp;Xiaowei Lv ,&nbsp;Panpan Sun ,&nbsp;Xiaohua Sun","doi":"10.1016/j.electacta.2025.147414","DOIUrl":"10.1016/j.electacta.2025.147414","url":null,"abstract":"<div><div>Non-precious Mn-based catalysts have emerged as highly desirable oxygen reduction reaction (ORR) electrocatalysts for Zn-air batteries, as they possess comparable activity to Fe-based catalysts while exhibiting superior stability by avoiding Fenton-induced degradation. Herein, we report an N-doped mesoporous carbon catalyst with atomically dispersed Mn-N_x sites (Mn-NMC), where the spatial confinement effect of its porous NMC architecture (BET surface area: 2161.6 m² g⁻¹) enables effective stabilization and accessibility of single Mn atoms. Therefore, Mn-NMC catalyst achieves exceptional ORR activity and durability through synergistic combination of atomically dispersed Mn-N_x active sites in enhancing intrinsic activity and the porous NMC matrix in optimizing active sites accessibility and mass transport. It delivers a half-wave potential of 0.90 V vs. RHE, a kinetic current density of 46.4 mA cm⁻² at 0.85 V, and 96 % current retention after 6 h of continuous operation, significantly outperforming its conventional NC-based counterparts. In practical applications, the Mn-NMC-based cathodes enable Zn-air batteries to achieve high peak power densities of 178/400 mW cm⁻² (aqueous/flexible), favorable rate capability maintaining stable operation up to 50/40 mA cm⁻², along with satisfactory cycling stability for ∼ 1100/85 h. Apart from that, Mn-NMC-based aqueous Zn-air battery can operate well at -4 °C, delivering a peak power density of 116 mW cm⁻² and maintaining stable operation for over 260 h at 10 mA cm⁻². These results highlight the structural advantages of Mn-NMC as a sustainable alternative to precious-metal catalysts for next-generation energy technologies.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147414"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The electrochemical symmetries of the oxygen reduction and evolution reactions are connected","authors":"Iratxe Aguado-Ruiz ,&nbsp;Ricardo Urrego-Ortiz ,&nbsp;Federico Calle-Vallejo","doi":"10.1016/j.electacta.2025.147410","DOIUrl":"10.1016/j.electacta.2025.147410","url":null,"abstract":"<div><div>The oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) display sizable overpotentials, even for active state-of-the-art catalysts. This hurdles the technoeconomic viability of a number of electrochemical technologies such as low-temperature hydrogen fuel cells, water and CO₂ electrolyzers, regenerative fuel cells, and some metal-air batteries. While adsorption-energy scaling relations have been associated with the large OER/ORR overpotentials, their breaking does not ensure enhanced activities. Alternatively, electrochemical symmetry is connected to the OER overpotential. Herein, we derive a formula connecting the OER electrochemical symmetry with that of the ORR. The formula explains the distinct trends arising when <span><math><mrow><mi>E</mi><mi>S</mi><mi>S</mi><msub><mi>I</mi><mrow><mi>O</mi><mi>E</mi><mi>R</mi></mrow></msub></mrow></math></span> and <span><math><mrow><mi>E</mi><mi>S</mi><mi>S</mi><msub><mi>I</mi><mrow><mi>O</mi><mi>R</mi><mi>R</mi></mrow></msub></mrow></math></span> are correlated, and the slopes are defined by the number of reaction steps above the equilibrium potential. Furthermore, we use a dataset of 168 materials including various families of electrocatalysts to statistically extract joint OER/ORR activity trends in simple terms.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147410"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Halide ions-contained polysulfides as cathode materials for aqueous zinc-sulfur batteries with improved cycling performance","authors":"Shixuan Guo ,&nbsp;Rui Mi ,&nbsp;Biao Ouyang ,&nbsp;Jianhua Wu ,&nbsp;Yanhong Xiang ,&nbsp;Xiangsi Wu ,&nbsp;Xianwen Wu ,&nbsp;Xiaochun Peng ,&nbsp;Heping Zhao ,&nbsp;Wei Song","doi":"10.1016/j.electacta.2025.147407","DOIUrl":"10.1016/j.electacta.2025.147407","url":null,"abstract":"<div><div>Organic sulfur-based cathode materials for aqueous zinc-sulfur batteries have garnered significant attention, however, insufficient sulfur content, and sluggish redox kinetics hinder their application. To overcome these challenges, polysulfides <strong>SZIM-X</strong> (X = Cl, Br, I) were synthesized via inverse vulcanization of sulfur with ZnX₂ coordinated 1-vinylimidazole. Carbon nanotubes composited <strong>SZIM-X</strong> (<strong>SZIM-X</strong>@CNTs) featuring imidazole-Zn²⁺ coordination bonds exhibited high sulfur content (&gt;64 wt%) and exceptional volume-change tolerance. The <strong>SZIM-Cl</strong>@CNTs-50 cathode delivered a high capacity of 690 mAh g^-1 at 0.5 A g^-1 with 53% retention after 100 cycles (35 A g^-1). Similarly, the <strong>SZIM-Br</strong>@CNTs-50 cathode exhibited a capacity of 356 mAh g^-1 with 55% retention after 100 cycles. In contrast, the <strong>SZIM-I</strong>@CNTs-50 achieved 420 mAh g^-1 at 0.5 A g^-1 with 77% retention even after 500 cycles. <em>Ex situ</em> XPS and <em>in situ</em> Raman analyses confirmed highly reversible redox transitions between S^2-↔S⁰↔S⁴⁺ and I^-↔I₃^- in Zn(ClO₄)₂ electrolyte. The findings provided a strategy and insight for practical applications of organic electrode materials in zinc-sulfur batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147407"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronic properties and ORR/OER catalytic activity of MOF-74 metal-organic frameworks: A theoretical study","authors":"Victor Hoyos-Sinchi, Walter Orellana","doi":"10.1016/j.electacta.2025.147371","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147371","url":null,"abstract":"The electronic properties and catalytic activity for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) of the metal–organic frameworks &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1051.5 848.5\" width=\"2.442ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-4D\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-MOF-74, where &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1051.5 848.5\" width=\"2.442ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-4D\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; = Cr, Mn, Fe, Co, Ni, and Cu, were investigated using density functional theory calculations. The ORR/OER activity was assessed by evaluating the adsorption free energy of reaction intermediates on the metal centers, following the computational hydrogen electrode method. Our findings reveal that all &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.971ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -747.2 1051.5 848.5\" width=\"2.442ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-4D\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-MOF-74 structures exhibit band gap energies of approximately 2 eV and high-spin magnetic moments per metal atom with a ferromagnetic ground state. In te","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"14 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly active and durable MNS bifunctional electrocatalysts for enhanced anion exchange membrane water electrolysis","authors":"Kailash Singh ,&nbsp;Himanshu Yadav ,&nbsp;Kunda Samdani ,&nbsp;Kaliaperumal Selvaraj","doi":"10.1016/j.electacta.2025.147408","DOIUrl":"10.1016/j.electacta.2025.147408","url":null,"abstract":"<div><div>The development of non-platinum group metal (non-PGM) electrocatalysts with performance comparable to their noble metal counterparts remains a significant challenge for overall water splitting. In this study, we demonstrate the performance of an Anion Exchange Membrane (AEM) water electrolyzer using a bifunctional, non-PGM electrocatalyst: reduced graphene oxide (rGO)-encapsulated MoS₂/Ni₃S₂ (MNS) grown on a nickel foam (NF) substrate. The rGO/MoS₂/Ni₃S₂ (rGO-MNS) electrode was synthesized via a facile, single-step hydrothermal method. For the hydrogen evolution reaction (HER), the rGO-MNS electrode exhibited a low overpotential of 94 mV at a current density of 100 mA cm⁻², maintaining excellent stability over 50 h with a minimal degradation rate of 120 µV h⁻¹. In the case of the oxygen evolution reaction (OER), an overpotential of 410 mV was required to reach the same current density, with a similarly robust durability and a degradation rate of only 360 µV h⁻¹. When employed as symmetric electrodes for overall water electrolysis, the rGO-MNS system achieved a current density of 10 mA cm⁻² at a cell voltage of 1.51 V, outperforming the benchmark Pt/C‖Ru/C catalyst pair, which required 1.58 V to reach the same performance. The enhanced electrocatalytic activity and durability are attributed to the conductive rGO encapsulation, which facilitates charge transfer and mitigates surface oxidation of the catalyst. These results present a promising strategy for designing cost-effective, durable, and high-performance non-PGM electrodes for AEM water electrolysis.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147408"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Graphene Foam Interdigitated Microband Arrays: [Fe(CN)6]3-/4- Generator-Collector Redox Processes and Prussian Blue Catalyst Attachment","authors":"Tingran Liu, James E. Taylor, Pablo Lozano-Sanchez, Calum Doig, Joanne Holmes, Marco Caffio, Philip J. Fletcher, Frank Marken","doi":"10.1016/j.electacta.2025.147396","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147396","url":null,"abstract":"Graphene foam based interdigitated microband array electrodes with typically 400 μm width and 150 μm inter-electrode gap (10 anodes and 10 cathodes, each 5.8 mm long; active array area 63.5 mm²) were produced on polyimide substrates and investigated for electrochemical performance. The one-electron reversible aqueous Fe(CN)₆^3-/4- redox system is employed in the presence and in the absence of 0.1 M KNO₃ supporting electrolyte. Voltammetric responses on graphene foam suggest essentially reversible electron transfer under diffusion control with solution resistivity/migration contributing to the peak-to-peak separation especially in the absence of added electrolyte. Under bipotentiostatic control, generator-collector feedback current signals are recorded with a signal hysteresis (affected by solution resistivity) consistent with a relatively wide inter-electrode gap. With a positive potential bias during repetitive cyclic voltammetry, Prussian blue deposits/electrocatalysts form on the graphene foam. Generator-collector processes for combined oxygen reduction-hydrogen peroxide oxidation are observed.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"21 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145067739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine Learning Optimized Synthesis of Ag/Nitrodopamine-MWCNT Hybrid for Durable and High-Performance OER Catalysis","authors":"Muhammad Asad, Inas A. Ahmed, Farhan Zafar, Aleena Imran, Muhammad Ali Khan, Naeem Akhtar, Muhammad Athar, Zahid Shafiq","doi":"10.1016/j.electacta.2025.147398","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147398","url":null,"abstract":"A wide range of multi-walled carbon nanotubes (MWCNTs)-based electrocatalysts have been reported for the oxygen evolution reaction (OER); however, their electrocatalytic performance is often limited by nanoparticle aggregation, poor structural integrity, and inadequate stability. To address these challenges, polymer-based linkers have been employed to mitigate nanoparticle aggregation, thereby enhancing structural robustness, interfacial binding, and durability. Despite this, maximizing electrocatalytic efficiency still requires precise and often labor-intensive optimization of the linker-catalyst interface. To overcome this challenge, herein we incorporated a machine learning (ML) assisted approach into the synthesis strategy, integrating nitrodopamine (NDA) as a molecular linker to enhance structural stability. Accordingly, we synthesized a composite material comprising MWCNTs functionalized with NDA-cross-linked silver nanoparticles (AgNPs). This strategy enabled precise tuning of NDA and Ag precursor concentrations, effectively reducing nanoparticle aggregation, enhancing structural integrity, and resulting in improved electrocatalytic performance and stability under oxidative conditions. Interestingly, the ML-optimized Ag/NDA/MWCNTs nanocomposite demonstrated enhanced electrocatalytic activity, achieving a low overpotential of 220 mV at 10 mA cm⁻² and a Tafel slope of 64.4 mV dec⁻¹, outperforming other electrocatalysts, including those with polydopamine linkers (Ag/PDA/MWCNTs) and without linkers (Ag/MWCNTs). The resulting electrocatalyst has shown high electrocatalytic activity and stability, highlighting the potential of ML-optimized design not only for advancing sustainable energy applications but also for guiding future, scalable developments in electrocatalyst design.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"22 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145067743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anion-modulated self-assembly and on-surface polymerization of 2-Bromothiophene on Au(111)","authors":"Chiao-An Hsieh,&nbsp;Min-Hsuan Li,&nbsp;Ezhumalai Yamuna,&nbsp;Ming-Chou Chen,&nbsp;Shuehlin Yau","doi":"10.1016/j.electacta.2025.147400","DOIUrl":"10.1016/j.electacta.2025.147400","url":null,"abstract":"<div><div>We report the anion-modulated self-assembly and electrochemical polymerization of 2-bromothiophene (BrT) on Au(111), probed by cyclic voltammetry and in situ scanning tunneling microscopy (STM). BrT forms ordered adlayers with distinct unit cells—(3 × 3), (3 × 2√3), (4 × √31), and (√7 × √13)—whose packing density depends on the applied potential and electrolyte anion. In H₂SO₄, bisulfate coadsorption stabilizes open, dynamic BrT structures, whereas in HClO₄, weak perchlorate adsorption enables compact packing at higher potentials. At anodic bias (≥ 0.9 V verse Ag/AgCl), BrT undergoes irreversible oxidative coupling, yielding surface-bound oligothiophenes aligned with Au(111) crystallography. The dual S/Br anchoring of BrT ensures stable adsorption, preferential alignment, and robust film growth. These results reveal a critical role of anion–molecule interactions in directing surface assembly and demonstrate a tunable pathway for potential-controlled nanostructure fabrication.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"542 ","pages":"Article 147400"},"PeriodicalIF":5.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DES-Guided Engineering of N-Doped Carbon for Mussel-Inspired, Oxygen-Vacancy-Rich CeO2 Nanozymes toward H2O2 Sensing","authors":"Ran Tao, Feifei Mu, Jérome Chauvin, Serge Cosnier, Xue-Ji Zhang, Dan Shan","doi":"10.1016/j.electacta.2025.147394","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147394","url":null,"abstract":"Rational design of highly dispersed CeO₂ nanozymes with abundant oxygen vacancies is critical for achieving efficient and sensitive H₂O₂ detection. Herein, we report a deep eutectic solvent (DES)-guided engineering strategy to construct an N-doped carbon (NC) framework integrated with mussel-inspired, uniformly dispersed CeO₂ nanoparticles. The DES acts both as a green C/N source and a self-templating medium, regulating heteroatom distribution and graphitization degree to yield a conductive carbon scaffold. Dopamine undergoes oxidative self-polymerization under mild alkaline conditions, and its catechol–amine functionalities strongly chelate Ce³⁺ ions, directing homogeneous nucleation and suppressing nanoparticle aggregation. This molecularly engineered architecture produces an oxygen-vacancy-rich interface enriched with redox-active Ce³⁺/Ce⁴⁺ sites, enabling rapid electron transfer and accelerated H₂O₂ redox kinetics. The optimized CeO₂/NC electrode delivers a diffusion-controlled amperometric response with dual linear ranges (0.05–60 and 60–300 μM), a low detection limit of 0.036 μM, and sensitivities of 94.8 and 49.3 mA M^-1 cm^-2, respectively, surpassing most reported CeO₂-based sensors. Furthermore, the sensor exhibits excellent selectivity and retains 89% of its initial response after prolonged operation. This work provides a scalable, eco-friendly pathway for constructing bioinspired, oxygen-vacancy-rich nanozymes, offering broad applicability in advanced electrocatalytic sensing platforms.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"30 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145067738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}