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Pascual, Laura Ferrer
Aalto University
in Cooperation with on an Cooperation-Score of 37%
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article
Interface matters - Effects of catalyst layer metallurgy on macroscale morphology and electrochemical performance of carbon nanofiber electrodes
Abstract
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. 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) ; The 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 ...