Interface matters - Effects of catalyst layer metallurgy on macroscale morphology and electrochemical performance of carbon nanofiber electrodes

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorPande, Ishan
dc.contributor.authorPascual, Laura Ferrer
dc.contributor.authorKousar, Ayesha
dc.contributor.authorPeltola, Emilia
dc.contributor.authorJiang, Hua
dc.contributor.authorLaurila, Tomi
dc.contributor.departmentDepartment of Electrical Engineering and Automation
dc.contributor.departmentMicrosystems Technology
dc.contributor.departmentDepartment of Applied Physics
dc.contributor.departmentDepartment of Electrical Engineering and Automationen
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.departmentDepartment of Chemistry and Materials Scienceen
dc.date.accessioned2022-12-22T09:45:09Z
dc.date.available2022-12-22T09:45:09Z
dc.date.issued2023-01
dc.descriptionFunding Information: This work was supported by funding from the Academy of Finland (#321996 and #328854) and Jane and Aatos Erkko Foundation. The authors acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Nanomicroscopy Center (Aalto-NMC) and at Micronova Nanofabrication Centre. I.P. would like to thank Elli Leppänen and Petri Mustonen for discussions regarding the PECVD process, and Dr. Jani Sainio for help with sample characterization. Funding Information: This work was supported by funding from the Academy of Finland (# 321996 and # 328854 ) and Jane and Aatos Erkko Foundation . The authors acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Nanomicroscopy Center (Aalto-NMC) and at Micronova Nanofabrication Centre. I.P. would like to thank Elli Leppänen and Petri Mustonen for discussions regarding the PECVD process, and Dr. Jani Sainio for help with sample characterization. Publisher Copyright: © 2022 The Author(s)
dc.description.abstractThe effect of catalyst materials and different process parameters on the growth of carbon nanofibers (CNFs) has been widely investigated. Typically, an adhesion metallization is required together with the catalyst to secure adequate attachment to the surface. The interactions within this multilayer structure and their effect on CNF growth and morphology has, however, not been thoroughly assessed. Thus, this work presents the growth behavior, the macroscale morphology, and the basic electrochemical characteristics of CNFs grown on two types of substrates - (1) Si + 80 nm Cr + 20 nm Ni, and (2) Si + 20 nm Ti + 20 nm Ni. Our results show that the macroscale geometric parameters of CNFs can be readily altered by using different adhesive layers. The inherently unstable Ti-Ni interface results in diffusion of Ni towards the silicon wafer to form silicide, which reduces the amount of available Ni for CNF nucleation, and therefore, the population density of fibers is reduced. On the other hand, the Cr-Ni interface results in a larger population density, but the rate of growth is reduced due to diffusion of carbon into the thicker Cr layer. The results are rationalized by using relevant binary and ternary phase diagrams. Further, cyclic voltammetry experiments show that the pseudocapacitance of CNFs shows a correlation with the length and population density of fibers, while the electron transfer kinetics appear nearly reversible for all the electrodes. This simple approach can be used for tailoring CNFs for specific applications by controlling their macroscale geometrical parameters.en
dc.description.versionPeer revieweden
dc.format.extent8
dc.format.mimetypeapplication/pdf
dc.identifier.citationPande , I , Pascual , L F , Kousar , A , Peltola , E , Jiang , H & Laurila , T 2023 , ' Interface matters - Effects of catalyst layer metallurgy on macroscale morphology and electrochemical performance of carbon nanofiber electrodes ' , Diamond and Related Materials , vol. 131 , 109566 . https://doi.org/10.1016/j.diamond.2022.109566en
dc.identifier.doi10.1016/j.diamond.2022.109566
dc.identifier.issn0925-9635
dc.identifier.otherPURE UUID: 8846b0c4-a109-4667-9701-77fdc5f21395
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/8846b0c4-a109-4667-9701-77fdc5f21395
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85143335063&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/94948722/1_s2.0_S0925963522007488_main.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/118516
dc.identifier.urnURN:NBN:fi:aalto-202212227254
dc.language.isoenen
dc.publisherElsevier BV
dc.relation.ispartofseriesDiamond and Related Materialsen
dc.relation.ispartofseriesVolume 131en
dc.rightsopenAccessen
dc.subject.keywordCarbon nanomaterials
dc.subject.keywordChemical vapor deposition
dc.subject.keywordCyclic voltammetry
dc.subject.keywordPhase diagram
dc.titleInterface matters - Effects of catalyst layer metallurgy on macroscale morphology and electrochemical performance of carbon nanofiber electrodesen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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