ACS electrochemistryPub Date : 2025-08-12eCollection Date: 2025-10-02DOI: 10.1021/acselectrochem.5c00121
Marius Amerio-Cox, Joshua J Tully, Fengping Tang, Anna Dettlaff, Julie V Macpherson, Timothy Mollart, Tim Sidnell, Simone Mathias, Patrick Sears, Madeleine J Bussemaker
{"title":"Investigation of Short Chain PFAS Degradation Efficiency Using Free-Standing Boron Doped Diamond Electrodes at High Current Density in a Flow Cell.","authors":"Marius Amerio-Cox, Joshua J Tully, Fengping Tang, Anna Dettlaff, Julie V Macpherson, Timothy Mollart, Tim Sidnell, Simone Mathias, Patrick Sears, Madeleine J Bussemaker","doi":"10.1021/acselectrochem.5c00121","DOIUrl":"10.1021/acselectrochem.5c00121","url":null,"abstract":"<p><p>Short chain PFAS is known to be more challenging to destructively remove than its longer chain counterparts. Electrochemical oxidation at boron doped diamond (BDD) electrodes is one promising way forward. The majority of investigations are carried out using thin film, high grain density BDD electrodes (attached to the growth substrate) at low current densities of <50 mA cm<sup>-2</sup>. In this work, the impact of high current density on short chain (C<sub>4</sub>), perfluorobutanoic acid (PFBA), and perfluorobutanesulfonic acid (PFBS) removal rates and defluorination efficiency is investigated in a recirculating flow system. These studies are carried out using free-standing BDD electrodes, which are grown thick enough so that the BDD can be removed from the non-diamond growth substrate and thus contain a much lower grain density compared to thin-film BDD. The cell utilizes four BDD electrodes, where only the two outer electrodes are directly connected to a potential supply, the two inner electrodes are electrically unconnected, and driven in a bipolar arrangement. Solutions contain saturated potassium sulfate as the electrolyte. A current density of ≥390 mA cm<sup>-2</sup> (after correcting for surface roughness) is employed for times up to 9 h. PFBS/PFBA concentrations in the range range ∼1-60 mg L<sup>-1</sup> are investigated. Importantly when comparing rate constant data to literature for similar concentrations (after normalization of the rate constants to treatment volume/anode area), the values suggest removal rates approximately an order of magnitude higher than those at lower current density (in stirred solutions). Defluorination efficiency is also found to be higher with (close to) complete defluorination indicated at higher concentrations/longer times for short chain PFAS. Microscopy analysis of the free-standing electrodes after deployment for >90 h of advanced oxidation reveals no obvious signs of corrosion. This likely reflects both the reduced grain boundary density and lower sp<sup>2</sup> carbon content in thick free-standing BDD. The data highlight the potential for this electrode material in long term electrochemical treatment of short chain PFAS solutions in recirculating flow systems.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 10","pages":"2014-2023"},"PeriodicalIF":0.0,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12498407/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145246306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-08-07Epub Date: 2025-04-14DOI: 10.1021/acselectrochem.5c00072
Jovica Todorov, Gregory S McCarty, Leslie A Sombers
{"title":"Mechanistic Insight into Tyrosine Oxidation at Carbon-Fiber Microelectrodes Revealed by Fast-Scan Cyclic Voltammetry.","authors":"Jovica Todorov, Gregory S McCarty, Leslie A Sombers","doi":"10.1021/acselectrochem.5c00072","DOIUrl":"10.1021/acselectrochem.5c00072","url":null,"abstract":"<p><p>A comprehensive understanding of tyrosine (Tyr) redox behavior will allow for improved electroanalytical monitoring and can shed light on complex biochemical processes. However, the study of Tyr at carbon electrodes is impeded by electrode fouling, which obfuscates quantitative analysis and mechanistic interpretation. In this study, fast-scan cyclic voltammetry (FSCV) was used to characterize Tyr redox properties at carbon-fiber microelectrodes. Tyr exhibited a distinct anodic peak indicative of irreversible redox chemistry that was modeled as a single-proton and single-electron transfer reaction combining surface-adsorbed and diffusing species. The adsorption properties and additional reactions were dependent on experimental conditions. Tyr accumulated on the electrode surface when negative holding potentials were employed between voltammetric sweeps, and Tyr oxidation resulted in electrochemical-chemical (EC) reactions that were dependent on the potential waveform employed. An unidentified species was generated when the potential was limited to +0.9 V, and a species that was putatively identified as DOPA/dopaquinone was generated when a 1.4 V switching potential was used, demonstrating a mechanistic role for reactive oxygen species in the reaction mechanism. When incorporated into small peptides, the oxidation potential and electron transfer rates were dependent on the position of Tyr relative to the N- or C-terminus, as well as the hydrophobicity of the nearby residues. Overall, these studies establish a robust framework for interpreting Tyr electroactivity at carbon-fiber microelectrodes, providing critical insight for the quantitative analysis of Tyr and Tyr-bearing biomolecules in physiological systems and guiding the development of antifouling strategies to enhance electrode performance.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 8","pages":"1423-1433"},"PeriodicalIF":0.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12674612/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145679990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-08-07Epub Date: 2025-06-03DOI: 10.1021/acselectrochem.5c00054
Jingyu Wang, Yongchao Xie, Yi Chen, Haiyuan Zou, Chong Liu
{"title":"Electrochemical Control with High Spatiotemporal Resolutions for Extracellular pH Microenvironment.","authors":"Jingyu Wang, Yongchao Xie, Yi Chen, Haiyuan Zou, Chong Liu","doi":"10.1021/acselectrochem.5c00054","DOIUrl":"10.1021/acselectrochem.5c00054","url":null,"abstract":"<p><p>The local pH values and hence the pH microenvironment surrounding an organism critically affect its metabolism and physiology in both prokaryotes and eukaryotes. Despite the ubiquitous spatiotemporal heterogeneity of local pH conditions in biology, a biocompatible method that spatiotemporally programs the pH microenvironment remains elusive. Here we report an electrochemical approach that spatiotemporally controls pH microenvironments for potential microbial applications. A quinone-based redox couple undergoes electrochemical proton-coupled electron transfer (PCET) that releases or consumes protons and hence changes the local pH. We designed a biocompatible hydroquinone/quinone redox couple that has minimal interference with bacterial aerobic respiration thanks to its hydrophilic nature and the specially targeted redox potential. Deploying such a uniquely designed redox couple with interdigitated electrodes in a microfluidic device leads to electrochemical control of the pH microenvironment with fast temporal modulation (~10<sup>1</sup> s) and high spatial resolution (~10<sup>0</sup> <i>μ</i>m) suitable for biological applications. The concept of deploying biocompatible electrochemistry offers a new venue toward perturbing biological microenvironments at the cellular if not subcellular level.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 8","pages":"1373-1383"},"PeriodicalIF":0.0,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12439615/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145083259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-31eCollection Date: 2025-10-02DOI: 10.1021/acselectrochem.5c00228
O Quinn Carvalho, Nikita S Dutta, Debjit Ghoshal, Steven P Harvey, Ross A Kerner, Shuya Li, Zebulon G Schichtl, Patrick Walker, Logan M Wilder, Gustavo Z Girotto, Maximilian Jaugstetter, Slavomir Nemsak, Ethan J Crumlin, Elisa M Miller, Ann L Greenaway
{"title":"Oxygen Evolution on Mechanically Strained TiO<sub>2</sub>/NiTi: Implications of Compositional Heterogeneity at (Photo)electrocatalytic Interfaces.","authors":"O Quinn Carvalho, Nikita S Dutta, Debjit Ghoshal, Steven P Harvey, Ross A Kerner, Shuya Li, Zebulon G Schichtl, Patrick Walker, Logan M Wilder, Gustavo Z Girotto, Maximilian Jaugstetter, Slavomir Nemsak, Ethan J Crumlin, Elisa M Miller, Ann L Greenaway","doi":"10.1021/acselectrochem.5c00228","DOIUrl":"10.1021/acselectrochem.5c00228","url":null,"abstract":"<p><p>The adsorption and activation energetics underpinning small molecule conversion on heterogeneous (photo)-electrocatalysts are intrinsically tied to catalyst surface properties. Absent compositional characterization techniques with sufficient interface sensitivity, however, (photo)-electrochemical performance can be misinterpreted in the context of bulk or near-surface material properties. Here we provide a fundamental investigation of the convoluting role of near-surface compositional heterogeneity in the interpretation of (photo)-electrochemical alkaline oxygen evolution reaction (OER) activity, highlighting challenges in correlating composition measured by surface- and near-surface-sensitive probes. TiO<sub>2</sub> thin films grown by air-annealing the superelastic alloy Nitinol (TiO<sub>2</sub>/NiTi) crack under tensile mechanical strain, increasing the number of electrochemically active Ni sites (Ni site density) that are probed via voltammetric features corresponding to Ni<sup>3+</sup>/Ni<sup>2+</sup> redox events. (Photo)-electrochemical OER kinetics trend with Ni site density, with overpotentials and Tafel slopes decreasing for Ni site densities < 10<sup>13</sup> Ni/cm<sup>2</sup> <sub>geo</sub> and asymptotically approaching the performance of the base NiTi substrate for Ni site densities > 10<sup>13</sup> Ni/cm<sup>2</sup> <sub>geo</sub>. Photoelectrochemical fill factors follow similar Ni site density dependent trends. When probing unstrained TiO<sub>2</sub>/NiTi, Ni site densities are two orders of magnitude higher when comparing near-surface-sensitive techniques (e.g., X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectrometry (TOF-SIMS), and scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS)) to surface-sensitive electrochemical measurements. This result highlights the challenge of correlating kinetic performance with intrinsic surface properties of electrochemical interfaces in the presence of near-surface compositional heterogeneity. Further, it reinforces the importance of fundamental investigations of surfaces with well-controlled composition and structure and the need for physically grounded and self-consistent interpretation of multiple near-surface characterization techniques.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 10","pages":"2177-2189"},"PeriodicalIF":0.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12498402/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145246284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-24eCollection Date: 2025-10-02DOI: 10.1021/acselectrochem.5c00210
Felix Hiege, Luca Marie Sicking, Kannasoot Kanokkanchana, Paolo Cignoni, Victor Dudarev, Alfred Ludwig, Kristina Tschulik
{"title":"The Crucial Role of Rotation Speed on the Determination of Tafel Slopes of Electrocatalysts in Rotating Disk Electrode Experiments.","authors":"Felix Hiege, Luca Marie Sicking, Kannasoot Kanokkanchana, Paolo Cignoni, Victor Dudarev, Alfred Ludwig, Kristina Tschulik","doi":"10.1021/acselectrochem.5c00210","DOIUrl":"10.1021/acselectrochem.5c00210","url":null,"abstract":"<p><p>This article highlights the crucial influence of rotation speeds in determining the Tafel slopes of electrocatalysts in rotating disk electrode (RDE) experiments. As an exemplary system, we investigate catalytically active nickel oxide/oxyhydroxide films that were generated from the transformation of electrodeposited nickel selenide at Au-RDEs, under oxygen evolution reaction (OER) conditions in alkaline electrolytes at three different rotation rates (1600, 2500, and 4000 rpm). Tafel slopes were extracted using cyclic voltammetry (CV) and chronoamperometry (CA). Our results underline the benefit of higher rotation speed in overcoming undesired mass transport limitations. Additionally, we point out that using CA instead of CV methods is preferable for the extraction of kinetic parameters since CA ensures steady state conditions and simplifies data analysis. Furthermore, we highlight that rigorous determination of reaction mechanisms based on Tafel slopes is only appropriate if the boundary conditions of the Butler-Volmer formalism are fulfilled, and we recommend not using Tafel slopes as the single parameter to compare the activity of electrocatalysts if these are obtained at different experimental conditions. Instead, we suggest reporting relevant measurement parameters such as the rotation speed of the experiment, way of Ohmic drop compensation, electrode geometry, and the electrochemical method used for Tafel analysis alongside the calculated Tafel slopes. Doing so may allow comparison to literature-reported Tafel slopes if the data were determined under similar experimental conditions. Rather than focusing on individual values, trends between systematically modified catalysts or at different aging stages should be considered meaningful.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 10","pages":"2149-2155"},"PeriodicalIF":0.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12498423/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145246287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-23eCollection Date: 2025-09-04DOI: 10.1021/acselectrochem.5c00233
Tsz-Kan Ma, Callum S Begg, James A Bull
{"title":"Electrochemical Copper Catalysis: A Triple Catalytic System for Transient C(sp<sup>2</sup>)-H Functionalization through Mediated Electrolysis.","authors":"Tsz-Kan Ma, Callum S Begg, James A Bull","doi":"10.1021/acselectrochem.5c00233","DOIUrl":"10.1021/acselectrochem.5c00233","url":null,"abstract":"<p><p>The development of copper-catalyzed C-H functionalization processes is challenging due to the inefficiency of conventional chemical oxidants in regenerating the copper catalyst. This study details the development of a mediated electrosynthetic approach involving triple catalytic cycles in transient C-H functionalization to achieve efficient copper-catalyzed C-(sp<sup>2</sup>)-H sulfonylation of benzylamines with sodium sulfinate salts. The triple catalytic system consists of a copper organometallic cycle for C-H functionalization, an aldehyde transient directing group (TDG) as an organocatalyst for imine formation, and a ferrocenium salt as an electrocatalyst. This mediated electrolysis strategy addresses key challenges associated with copper electrochemical C-H activation, including irreversible copper electroplating at the cathode and undesired substrate oxidative degradation. Mechanistic studies, including monitoring the anode operating potential and cyclic voltammetry, provided valuable insights into the mediated electrolysis process and the copper ion reoxidation mechanism to support the mechanistic proposal. This mediated strategy provides a new avenue for developing more efficient copper catalyzed transient C-H functionalization processes enabled by synthetic electrochemistry.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 9","pages":"1863-1870"},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12415948/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145031627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-16eCollection Date: 2025-09-04DOI: 10.1021/acselectrochem.5c00175
Maria F Rochow, Daniela H Marin, Harrison J Cassady, Ryan T Hannagan, Katherine Yan, Joseph T Perryman, Adam C Nielander, Thomas F Jaramillo, Michael A Hickner
{"title":"Controlling Chloride Crossover in Bipolar Membrane Water Electrolysis.","authors":"Maria F Rochow, Daniela H Marin, Harrison J Cassady, Ryan T Hannagan, Katherine Yan, Joseph T Perryman, Adam C Nielander, Thomas F Jaramillo, Michael A Hickner","doi":"10.1021/acselectrochem.5c00175","DOIUrl":"10.1021/acselectrochem.5c00175","url":null,"abstract":"<p><p>Bipolar membranes (BPMs) are increasingly recognized as a promising electrolyte option for water electrolysis, attributable to their distinctive properties derived from the membrane's layered structure, which consists of an anion exchange (AEL) and a cation exchange layer (CEL). This study investigates four different BPMs and the influence they have on the performance of a water electrolysis cell under two different feed configurations: (1) a symmetric deionized water feed to both anode and cathode compartments and (2) an asymmetric feed with a 0.5 mol/L NaCl catholyte feed and a deionized water anolyte feed. The BPMs were also investigated for total chlorine (Cl) species (e.g., Cl<sup>-</sup>, Cl<sub>2</sub>, HOCl, and ClO<sup>-</sup>) in the anolyte due to Cl<sup>-</sup> crossover from the catholyte during water electrolysis with the asymmetric feed, at an applied current density of 250 mA/cm<sup>2</sup>. The best-performing BPM with the asymmetric feed was an E98-05 (CEL)/FAS-50 (AEL) membrane with a TiO<sub>2</sub> water dissociation catalyst at the BPM junction. This membrane had the lowest measured Cl species crossover and lowest cell voltage at a given current density under asymmetric conditions compared to the other BPMs studied. It was also found that under asymmetric conditions the CEL facing the catholyte feed determined the amount of total Cl species crossover due to anion exclusion (Donnan exclusion) of the CEL, reducing the amount of Cl<sup>-</sup> in the CEL where it crossed over to the AEL and the anolyte compartment.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 9","pages":"1812-1820"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12415932/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145031601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-15eCollection Date: 2025-09-04DOI: 10.1021/acselectrochem.5c00224
Xiangdong Xu, Minkyung Kang, Sabrina Yan, Enrico Daviddi, Geoff West, Dimitrios Valavanis, Oluwasegun J Wahab, Patrick R Unwin
{"title":"Surface Structure and Grain Boundary Effects on the Oxygen Evolution Reaction at Gold Electrodes.","authors":"Xiangdong Xu, Minkyung Kang, Sabrina Yan, Enrico Daviddi, Geoff West, Dimitrios Valavanis, Oluwasegun J Wahab, Patrick R Unwin","doi":"10.1021/acselectrochem.5c00224","DOIUrl":"10.1021/acselectrochem.5c00224","url":null,"abstract":"<p><p>The surface structure of an electrocatalyst plays a crucial role in determining the activity. As a model system, gold has been widely investigated as an electro-oxidation catalyst, although there has been much less research on the oxygen evolution reaction (OER) in the potential region of gold oxidation. Here, we combine voltammetric scanning electrochemical cell microscopy (SECCM) and electron backscatter diffraction (EBSD), at different spatial and angular resolutions, respectively, to correlate the local crystallographic structure of polycrystalline goldfocusing on grains close to (113), (011), (114), and (111) orientationswith the electrocatalytic behavior for the OER. By recording potential-dependent electrochemical movies, grain-dependent gold oxidation and gold oxide reduction are clearly visualized. In contrast, the OER demonstrates less grain dependence. High-resolution SECCM also provides a powerful way to map the electrochemical activity for OER at grain boundaries, where distinct boundaries exhibit either enhanced or suppressed activity, revealing a strong correlation with the electrochemical active surface area, together with effects from surface roughness and dislocation densities. This latter aspect of the work further emphasizes the important role of grain boundaries in electrocatalysis and the ability of SECCM to directly target and map the activity of these underexplored regions.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 9","pages":"1852-1862"},"PeriodicalIF":0.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12415841/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145031433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-15eCollection Date: 2025-10-02DOI: 10.1021/acselectrochem.5c00172
Andrea Conte, Sara Bonacchi, Sabrina Antonello
{"title":"Electrochemical Fingerprints of Nanostructured Cu and Ag Electrodes.","authors":"Andrea Conte, Sara Bonacchi, Sabrina Antonello","doi":"10.1021/acselectrochem.5c00172","DOIUrl":"10.1021/acselectrochem.5c00172","url":null,"abstract":"<p><p>Copper and silver electrodes, particularly in their crystalline and nanostructured forms, play a pivotal role in a wide range of electrochemical applications, including catalysis, sensing, and energy conversion. The electrochemical behavior of these materials, dictated by their crystallographic surface structures, has unique features and represents a key to understanding and optimizing their performance and expanding their applications. This review focuses on recent achievements about the electrochemical fingerprints of crystalline Cu and Ag electrodes, with particular attention to their nanostructured forms, and explores how surface-specific activities such as underpotential deposition (UPD), hydroxide electrosorption, and redox behavior vary across different surface orientations. The impact of crystal facet orientation on electrochemical performance is discussed, highlighting how variations in surface atomic configurations affect adsorption phenomena and, ultimately, catalytic selectivity. Understanding these structure-activity relationships is crucial for the design, synthesis, and characterization of innovative Cu and Ag nanostructures, with the aim of addressing the current challenges in renewable energy development.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 10","pages":"1903-1923"},"PeriodicalIF":0.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12498525/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145246317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS electrochemistryPub Date : 2025-07-09eCollection Date: 2025-09-04DOI: 10.1021/acselectrochem.5c00108
Astrid E Delorme, Andrew Jordan, Jessica Streets, Victor Sans, Stephen P Argent, Helen F Sneddon, Peter Licence, Darren A Walsh
{"title":"Recyclable Multifunctional Ionic Liquids for Sustainable Electroorganic Oxidations.","authors":"Astrid E Delorme, Andrew Jordan, Jessica Streets, Victor Sans, Stephen P Argent, Helen F Sneddon, Peter Licence, Darren A Walsh","doi":"10.1021/acselectrochem.5c00108","DOIUrl":"10.1021/acselectrochem.5c00108","url":null,"abstract":"<p><p>The study of electrochemical oxidations has wide-ranging implications, from the development of new electrocatalysts for fuel cells for energy conversion, to the synthesis of fine chemicals. 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) has been used for decades as a sustainable, metal-free mediator for chemical oxidations and is now being used for electrochemical oxidations. We describe here a novel approach to TEMPO-mediated electrooxidations, in which the chemical input and waste generated during electrooxidations of alcohols are minimized by using a multifunctional room temperature ionic liquid (RTIL) to facilitate flow electrosynthesis. Our three-pronged approach involves the following: (1) the use of a recyclable alkylimidazolium-based RTIL to replace the electrolytes and volatile organic solvents typically used in TEMPO-mediated alcohol electrooxidations; (2) pairing alcohol oxidation at the positive electrode with electroreduction of the cationic component of the RTIL at the negative electrode to generate the base required for the electrosynthesis; (3) incorporation of the catalytic TEMPO moiety in our RTIL-based system. We demonstrate the possibilities offered by our strategy using a range of alcohols, illustrating the scope of reactions that can be driven using our strategy and demonstrating the opportunities offered by task-specific, multifunctional RTILs for electroorganic synthesis.</p>","PeriodicalId":520400,"journal":{"name":"ACS electrochemistry","volume":"1 9","pages":"1659-1665"},"PeriodicalIF":0.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12415826/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145031466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}