Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures
ABSTRACT Layered double hydroxides (LDHs) are ionic layered compounds characterized by anion‐containing intermediate regions within positively charged brucite‐like layers. LDHs have shown high electrochemical activity in energy conversion systems such as batteries and fuel cells. In this study, we d...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | EcoMat |
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| Online Access: | https://doi.org/10.1002/eom2.12510 |
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| author | Yuri Jeon Jury Medvedev Yeeun Seong Xenia Medvedeva Cheongwon Bae Jeongeon Kim Anna Klinkova Juyeong Kim |
| author_facet | Yuri Jeon Jury Medvedev Yeeun Seong Xenia Medvedeva Cheongwon Bae Jeongeon Kim Anna Klinkova Juyeong Kim |
| author_sort | Yuri Jeon |
| collection | DOAJ |
| description | ABSTRACT Layered double hydroxides (LDHs) are ionic layered compounds characterized by anion‐containing intermediate regions within positively charged brucite‐like layers. LDHs have shown high electrochemical activity in energy conversion systems such as batteries and fuel cells. In this study, we developed a hierarchically porous nanostructure derived from zeolitic imidazolate framework‐67, which was subsequently transformed into an LDH structure with varying Ni concentrations. We precisely controlled the Ni‐to‐Co ratio within the LDH structure and investigated how different mole fractions of Co and Ni influence catalytic activity and selectivity for the electrochemical urea oxidation reaction (UOR). LDH structures with low Ni content (up to 40%) demonstrated high activity and selectivity for O2 due to their structural instability and the predominant oxygen evolution reaction (OER) originating from ZIF‐67. In contrast, LDHs with high Ni content (over 60%) supressed OER and exhibited enhanced activity for UOR. The resulting hollow structure with an expanded electrochemically active surface in LDHs with high Ni content could improve mass transport and diffusion at the electrode interface, leading to better reaction kinetics and higher current densities. These findings provide a foundational design guideline for metal–organic framework‐derived nanostructure in UOR. |
| format | Article |
| id | doaj-art-d36b01034e2046f0adac17bf31a9c02c |
| institution | Kabale University |
| issn | 2567-3173 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | EcoMat |
| spelling | doaj-art-d36b01034e2046f0adac17bf31a9c02c2025-01-16T00:02:33ZengWileyEcoMat2567-31732025-01-0171n/an/a10.1002/eom2.12510Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived NanostructuresYuri Jeon0Jury Medvedev1Yeeun Seong2Xenia Medvedeva3Cheongwon Bae4Jeongeon Kim5Anna Klinkova6Juyeong Kim7Department of Chemistry Gyeongsang National University Jinju South KoreaDepartment of Chemistry University of Waterloo Ontario CanadaDepartment of Chemistry Gyeongsang National University Jinju South KoreaDepartment of Chemistry University of Waterloo Ontario CanadaDepartment of Chemistry Gyeongsang National University Jinju South KoreaDepartment of Chemistry Gyeongsang National University Jinju South KoreaDepartment of Chemistry University of Waterloo Ontario CanadaDepartment of Chemistry Gyeongsang National University Jinju South KoreaABSTRACT Layered double hydroxides (LDHs) are ionic layered compounds characterized by anion‐containing intermediate regions within positively charged brucite‐like layers. LDHs have shown high electrochemical activity in energy conversion systems such as batteries and fuel cells. In this study, we developed a hierarchically porous nanostructure derived from zeolitic imidazolate framework‐67, which was subsequently transformed into an LDH structure with varying Ni concentrations. We precisely controlled the Ni‐to‐Co ratio within the LDH structure and investigated how different mole fractions of Co and Ni influence catalytic activity and selectivity for the electrochemical urea oxidation reaction (UOR). LDH structures with low Ni content (up to 40%) demonstrated high activity and selectivity for O2 due to their structural instability and the predominant oxygen evolution reaction (OER) originating from ZIF‐67. In contrast, LDHs with high Ni content (over 60%) supressed OER and exhibited enhanced activity for UOR. The resulting hollow structure with an expanded electrochemically active surface in LDHs with high Ni content could improve mass transport and diffusion at the electrode interface, leading to better reaction kinetics and higher current densities. These findings provide a foundational design guideline for metal–organic framework‐derived nanostructure in UOR.https://doi.org/10.1002/eom2.12510electrocatalystlayered double hydroxideporosityurea oxidation reactionzeolitic imidazolate framework |
| spellingShingle | Yuri Jeon Jury Medvedev Yeeun Seong Xenia Medvedeva Cheongwon Bae Jeongeon Kim Anna Klinkova Juyeong Kim Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures EcoMat electrocatalyst layered double hydroxide porosity urea oxidation reaction zeolitic imidazolate framework |
| title | Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures |
| title_full | Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures |
| title_fullStr | Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures |
| title_full_unstemmed | Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures |
| title_short | Enhanced Urea Oxidation Reaction Through Layered Double Hydroxides: Insights From ZIF‐67‐Derived Nanostructures |
| title_sort | enhanced urea oxidation reaction through layered double hydroxides insights from zif 67 derived nanostructures |
| topic | electrocatalyst layered double hydroxide porosity urea oxidation reaction zeolitic imidazolate framework |
| url | https://doi.org/10.1002/eom2.12510 |
| work_keys_str_mv | AT yurijeon enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT jurymedvedev enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT yeeunseong enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT xeniamedvedeva enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT cheongwonbae enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT jeongeonkim enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT annaklinkova enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures AT juyeongkim enhancedureaoxidationreactionthroughlayereddoublehydroxidesinsightsfromzif67derivednanostructures |