{"title":"Perspective on the Technology Status of Chemical Hydrogen Carriers for Ship-Based Energy Import","authors":"Andreas Peschel, Peter Wasserscheid","doi":"10.1002/elsa.70015","DOIUrl":"https://doi.org/10.1002/elsa.70015","url":null,"abstract":"<p>The transport of hydrogen for the import of renewable energy will play an important role for the highly industrialized regions in Europe to meet their energy needs. As the storage and transportation of neat hydrogen comes with considerable downsides with respect to energy density and infrastructure compatibility, chemical hydrogen carriers are a promising concept to enable large-scale hydrogen import. This perspective discusses the advantages, limitations and current technology readiness levels of chemical hydrogen carriers for intercontinental transport by ship. In terms of rapid scale-up and market entry, ammonia and methanol are the most promising short-term options. If the market for chemical hydrogen carriers grows as expected, it is likely that chemical hydrogen carriers optimized for certain applications will coexist, optimizing the individual value chains.</p>","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146136678","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}
Astghik S. Tsokolakyan, Vardan A. Hayrapetyan, Derenik K. Petrosyan, Melanie Welden, Heiko Iken, Michael J. Schöning, Mkrtich A. Yeranosyan, Arshak Poghossian
{"title":"Urea Biosensor Based on a Field-Effect Capacitor Modified With a Stacked Weak Polyelectrolyte/Enzyme Bilayer","authors":"Astghik S. Tsokolakyan, Vardan A. Hayrapetyan, Derenik K. Petrosyan, Melanie Welden, Heiko Iken, Michael J. Schöning, Mkrtich A. Yeranosyan, Arshak Poghossian","doi":"10.1002/elsa.70013","DOIUrl":"https://doi.org/10.1002/elsa.70013","url":null,"abstract":"<p>Urea is formed from the metabolism of proteins and used as a biomarker for diagnosing and monitoring various medical conditions. In this work, a urea biosensor based on an electrolyte-insulator-semiconductor capacitor (EISCAP) modified with a stacked polyelectrolyte polyallylamine hydrochloride (PAH)/urease bilayer prepared by the layer-by-layer (LbL) technique is presented for the first time. The LbL formation of the PAH/urease bilayer was monitored with an underlying charge-sensitive Al/p-Si/SiO<sub>2</sub>/Ta<sub>2</sub>O<sub>5</sub> EISCAP using convenient capacitive-voltage and constant-capacitance mode measurements. Urea-sensitive EISCAP biosensors were electrochemically characterised in buffer solutions and artificial urine (AU) samples spiked with various concentrations of urea between 0.1 mM and 50 mM. The biosensors exhibited urea sensitivities of ca. 35.4 mV/dec and 32.1 mV/dec in buffer and AU solutions, respectively. Finally, local surface pH changes as a function of urea concentration have been evaluated. The obtained findings demonstrate the potential of PAH/urease-modified EISCAPs for non-invasive urea biomarker detection in urine samples at homecare or in-field settings.</p>","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145964402","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}
Kadir Sinan Aslan, Erdal Ertaş, Mehmet Firat Baran, Abdulkadir Levent, Şeyhmus Tümür, Aziz Eftekhari, Ondrej Šauša, Oleh Smutok, Taras Kavetskyy, Evgeny Katz
{"title":"Enhanced Electrochemical Performance of Supercapacitors Using Fe3O4-Doped Biomass-Derived Activated Carbon Electrodes","authors":"Kadir Sinan Aslan, Erdal Ertaş, Mehmet Firat Baran, Abdulkadir Levent, Şeyhmus Tümür, Aziz Eftekhari, Ondrej Šauša, Oleh Smutok, Taras Kavetskyy, Evgeny Katz","doi":"10.1002/elsa.70014","DOIUrl":"https://doi.org/10.1002/elsa.70014","url":null,"abstract":"<p>The energy storage performance of supercapacitors—defined by specific capacitance, energy density, and power density—is strongly influenced by the structural and electrochemical properties of electrode materials. While cathode development has advanced significantly, research on efficient and sustainable anode materials remains limited, hindering further improvements in energy density. This study presents a low-cost, sustainable anode material derived from <i>Abelmoschus esculentus</i> (AE) seed biomass. Activated carbon (AE-AC) was prepared via chemical activation and subsequently coated with magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles synthesised through co-precipitation to form an AE-AC-doped Fe<sub>3</sub>O<sub>4</sub> nanocomposite. The materials were characterised using XRD, SEM–EDX, BET surface area analysis, and other techniques. Electrochemical performance was evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). At a scan rate of 2.5 mV/s, both electrodes exhibited peak capacitance. GCD analysis showed specific capacitances of 119.97 F/g for AE-AC and 205.86 F/g for AE-AC-doped Fe<sub>3</sub>O<sub>4</sub> at 0.05 A/g. EIS results confirmed enhanced performance of the nanocomposite in acidic medium. These findings highlight the potential of AE-based activated carbon composites as environmentally friendly and efficient anode materials for next-generation supercapacitors.</p>","PeriodicalId":93746,"journal":{"name":"Electrochemical science advances","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/elsa.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145984048","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}
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