Investigating the Influence of Pore Sizes in Metal-organic Frameworks (MOFs) on Electrochemical Properties

Investigating the Influence of Pore Sizes in Metal-organic Frameworks (MOFs) on Electrochemical Properties | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Investigating the Influence of Pore Sizes in Metal-organic Frameworks (MOFs) on Electrochemical Properties Subhajit Sarkar, Nadiah Imran, Noordini Mohamad Salleh, Siti Rohana Majid, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4785059/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Three distinct MOFs; MOF-199, MOF-5, and UiO-66 - each having varying pore diameters and unique structural characteristics were synthesized and their molecular structures are confirmed using FT-IR, PXRD and FESEM techniques. Continuing the experiments, conductivity of MOFs were measured by EIS. The results indicate that UiO-66 exhibits the highest conductivity value, with a value of 2.32 × 10-5 Scm-1. Upon evaluating the effect of pore diameters with conductivity, different salt percentage were added into the MOFs to obtain the MOF-based free-standing electrolytes. Results obtained shows that different MOFs display varied conductivity values that consistently increase upon the addition of salt. However, each MOF demonstrates a unique optimized percentage of salt—was determined to be 10%, 60%, and 40%, specifically for MOF-199, MOF-5, and UiO-66, respectively and did not show significant correlations with the pore sizes of the MOFs. The highest conductivity value was observed for UiO-66 with 10% NaCl, reaching up to 7.35 × 10-5 Scm-1. 10% NaCl was substituted with 10% NaOH to evaluate the effect of different salt. Results obtained shows show minimal changes with a conductivity value of 4.61× 10-5 Scm-1. CV were conducted on the MOFs and their free-standing electrolytes showing leaf-shaped cyclic voltammogram demonstrate promising enhanced capacitive behaviour. Comparing the cyclic voltammograms of UiO-66 with 10% NaCl and 10 % NaOH separately, no significant changes observed confirming the conducting species in the free-standing electrolyte systems to be the Na+. Dielectric calculations were performed and agree well with the experimental values. BET results obtained for MOF-199 and UiO-66, along with their optimized MOF-based free-standing electrolytes, show that the surface area as well as the pore volume decreased, indicating that the pores were being occupied by Na+, thereby increasing the conductivity. In contrast to these two systems, MOF-5 displays unique properties where the surface area and pore sizes extended. Overall, results obtained through out this research supports their potential application of MOFs as hybrid electrolyte materials in the future. Metal-organic frameworks (MOFs) porosity conductivity electrochemical studies dielectric constant Full Text Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4785059","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":332947464,"identity":"16a43666-fcea-43c6-81c5-97bc7427705c","order_by":0,"name":"Subhajit Sarkar","email":"","orcid":"","institution":"University of Malaya: Universiti Malaya","correspondingAuthor":false,"prefix":"","firstName":"Subhajit","middleName":"","lastName":"Sarkar","suffix":""},{"id":332947465,"identity":"186e0127-98a3-449e-902c-db7722bd7fa7","order_by":1,"name":"Nadiah Imran","email":"","orcid":"","institution":"Universiti Malaya","correspondingAuthor":false,"prefix":"","firstName":"Nadiah","middleName":"","lastName":"Imran","suffix":""},{"id":332947466,"identity":"bdfa1321-c5fe-443d-aabb-9ba8a6f5d0fa","order_by":2,"name":"Noordini Mohamad Salleh","email":"","orcid":"","institution":"Universiti Malaya","correspondingAuthor":false,"prefix":"","firstName":"Noordini","middleName":"Mohamad","lastName":"Salleh","suffix":""},{"id":332947467,"identity":"9b2fd983-a92a-4d42-b7d5-f70fdb2ddb0e","order_by":3,"name":"Siti Rohana Majid","email":"","orcid":"","institution":"Universiti Malaya","correspondingAuthor":false,"prefix":"","firstName":"Siti","middleName":"Rohana","lastName":"Majid","suffix":""},{"id":332947468,"identity":"cf1de8ec-0a9c-4a9c-bdd4-354352f52517","order_by":4,"name":"Mohd. 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Continuing the experiments, conductivity of MOFs were measured by EIS. The results indicate that UiO-66 exhibits the highest conductivity value, with a value of 2.32 × 10-5 Scm-1. Upon evaluating the effect of pore diameters with conductivity, different salt percentage were added into the MOFs to obtain the MOF-based free-standing electrolytes. Results obtained shows that different MOFs display varied conductivity values that consistently increase upon the addition of salt. However, each MOF demonstrates a unique optimized percentage of salt—was determined to be 10%, 60%, and 40%, specifically for MOF-199, MOF-5, and UiO-66, respectively and did not show significant correlations with the pore sizes of the MOFs. The highest conductivity value was observed for UiO-66 with 10% NaCl, reaching up to 7.35 × 10-5 Scm-1. 10% NaCl was substituted with 10% NaOH to evaluate the effect of different salt. Results obtained shows show minimal changes with a conductivity value of 4.61× 10-5 Scm-1. CV were conducted on the MOFs and their free-standing electrolytes showing leaf-shaped cyclic voltammogram demonstrate promising enhanced capacitive behaviour. Comparing the cyclic voltammograms of UiO-66 with 10% NaCl and 10 % NaOH separately, no significant changes observed confirming the conducting species in the free-standing electrolyte systems to be the Na+. Dielectric calculations were performed and agree well with the experimental values. BET results obtained for MOF-199 and UiO-66, along with their optimized MOF-based free-standing electrolytes, show that the surface area as well as the pore volume decreased, indicating that the pores were being occupied by Na+, thereby increasing the conductivity. In contrast to these two systems, MOF-5 displays unique properties where the surface area and pore sizes extended. 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