{"title":"与石墨烯封装的核壳铁铜纳米合金耦合的双单原子位点用于促进氧还原反应","authors":"Katam Srinivas, Zhou Chen, Anran Chen, He Huang, Chengtao Yang, Fei Wang, Ming-Qiang Zhu, Yuanfu Chen","doi":"10.1039/d4ta05015k","DOIUrl":null,"url":null,"abstract":"Replacing platinum-based electrocatalysts with iron single-atom catalysts (Fe-N4-C) for the oxygen reduction reaction (ORR) remains challenging due to the symmetric electronic structure of atomically dispersed Fe-N4 sites and sluggish kinetics. To address this issue, we introduce Cu-Nx sites and graphene-encapsulated core-shell Fe-Cu nanoalloy (FeCu@G) particles into the Fe-Nx site surroundings through self-assembly and pyrolysis of a metal-organic framework (MOF). This strategy leverages synergistic interactions with the associated species to modify the uniform electronic structure of Fe single-atom sites, thereby enhancing oxygen-adsorption/desorption kinetics. Density functional theory (DFT) calculations reveal that the incorporation of Cu-Nx sites and FeCu@G nanoalloy significantly alters the electronic structure of Fe-Nx sites, leading to improved ORR activity. Consequently, the optimized FeCu-DSAs@CNT, comprising dual single-atom sites (DSAs: Fe-Nx and Cu-Nx) and FeCu@G nanoalloy within MOF-derived nitrogen-doped carbon nanotubes (CNT), exhibits a significantly improved half-wave potential (E1/2 = 0.91 V) and feasible ORR kinetics (Tafel slope = 48.15 mV dec-1), surpassing the Pt/C benchmark (E1/2 = 0.847 V and Tafel slope = 56.76 mV dec-1). Notably, FeCu-DSAs@CNT shows a 58 mV more positive E1/2 compared to monometallic Fe-SAs@CNT, attributed to synergistic interactions with Cu species. Moreover, it demonstrates excellent power density, specific capacity, and cycling stability in a lab-made Zinc-air battery, outpacing the Pt/C-battery. This study addresses gaps in understanding Fe-Nx site interactions with associated species, providing valuable insights for the advancement of Fe-Nx-C electrocatalysts.","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":null,"pages":null},"PeriodicalIF":10.7000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Dual Single-Atom Sites Coupled with Graphene-Encapsulated Core-Shell Fe-Cu Nanoalloy for Boosting Oxygen Reduction Reaction\",\"authors\":\"Katam Srinivas, Zhou Chen, Anran Chen, He Huang, Chengtao Yang, Fei Wang, Ming-Qiang Zhu, Yuanfu Chen\",\"doi\":\"10.1039/d4ta05015k\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Replacing platinum-based electrocatalysts with iron single-atom catalysts (Fe-N4-C) for the oxygen reduction reaction (ORR) remains challenging due to the symmetric electronic structure of atomically dispersed Fe-N4 sites and sluggish kinetics. To address this issue, we introduce Cu-Nx sites and graphene-encapsulated core-shell Fe-Cu nanoalloy (FeCu@G) particles into the Fe-Nx site surroundings through self-assembly and pyrolysis of a metal-organic framework (MOF). This strategy leverages synergistic interactions with the associated species to modify the uniform electronic structure of Fe single-atom sites, thereby enhancing oxygen-adsorption/desorption kinetics. Density functional theory (DFT) calculations reveal that the incorporation of Cu-Nx sites and FeCu@G nanoalloy significantly alters the electronic structure of Fe-Nx sites, leading to improved ORR activity. Consequently, the optimized FeCu-DSAs@CNT, comprising dual single-atom sites (DSAs: Fe-Nx and Cu-Nx) and FeCu@G nanoalloy within MOF-derived nitrogen-doped carbon nanotubes (CNT), exhibits a significantly improved half-wave potential (E1/2 = 0.91 V) and feasible ORR kinetics (Tafel slope = 48.15 mV dec-1), surpassing the Pt/C benchmark (E1/2 = 0.847 V and Tafel slope = 56.76 mV dec-1). Notably, FeCu-DSAs@CNT shows a 58 mV more positive E1/2 compared to monometallic Fe-SAs@CNT, attributed to synergistic interactions with Cu species. Moreover, it demonstrates excellent power density, specific capacity, and cycling stability in a lab-made Zinc-air battery, outpacing the Pt/C-battery. This study addresses gaps in understanding Fe-Nx site interactions with associated species, providing valuable insights for the advancement of Fe-Nx-C electrocatalysts.\",\"PeriodicalId\":82,\"journal\":{\"name\":\"Journal of Materials Chemistry A\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":10.7000,\"publicationDate\":\"2024-09-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Chemistry A\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1039/d4ta05015k\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry A","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4ta05015k","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Dual Single-Atom Sites Coupled with Graphene-Encapsulated Core-Shell Fe-Cu Nanoalloy for Boosting Oxygen Reduction Reaction
Replacing platinum-based electrocatalysts with iron single-atom catalysts (Fe-N4-C) for the oxygen reduction reaction (ORR) remains challenging due to the symmetric electronic structure of atomically dispersed Fe-N4 sites and sluggish kinetics. To address this issue, we introduce Cu-Nx sites and graphene-encapsulated core-shell Fe-Cu nanoalloy (FeCu@G) particles into the Fe-Nx site surroundings through self-assembly and pyrolysis of a metal-organic framework (MOF). This strategy leverages synergistic interactions with the associated species to modify the uniform electronic structure of Fe single-atom sites, thereby enhancing oxygen-adsorption/desorption kinetics. Density functional theory (DFT) calculations reveal that the incorporation of Cu-Nx sites and FeCu@G nanoalloy significantly alters the electronic structure of Fe-Nx sites, leading to improved ORR activity. Consequently, the optimized FeCu-DSAs@CNT, comprising dual single-atom sites (DSAs: Fe-Nx and Cu-Nx) and FeCu@G nanoalloy within MOF-derived nitrogen-doped carbon nanotubes (CNT), exhibits a significantly improved half-wave potential (E1/2 = 0.91 V) and feasible ORR kinetics (Tafel slope = 48.15 mV dec-1), surpassing the Pt/C benchmark (E1/2 = 0.847 V and Tafel slope = 56.76 mV dec-1). Notably, FeCu-DSAs@CNT shows a 58 mV more positive E1/2 compared to monometallic Fe-SAs@CNT, attributed to synergistic interactions with Cu species. Moreover, it demonstrates excellent power density, specific capacity, and cycling stability in a lab-made Zinc-air battery, outpacing the Pt/C-battery. This study addresses gaps in understanding Fe-Nx site interactions with associated species, providing valuable insights for the advancement of Fe-Nx-C electrocatalysts.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.