Facile and binder-free synthesis of N-doped carbon/ZnCo 2 O 4 hybrid nanostructures on nickel foam for high-performance
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Facile and binder-free synthesis of N-doped carbon/ZnCo2O4 hybrid nanostructures on nickel foam for high-performance solid-state asymmetric supercapacitor Ahmad Asghari1 · Sayed Habib Kazemi2 · Mohammadreza Khanmohammadi1 Received: 21 October 2019 / Accepted: 27 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A high-performance supercapacitor electrode was fabricated through a facile and binder-free hydrothermal method based on N-doped carbon/ZnCo2O4 honey nest nanostructures (N-C/ZnCo2O4). High-fructose corn syrup (HFCS55) was used as a new, green, and inexpensive carbon source. The structure and morphology of the electrode material were investigated using scanning electron microscopy (SEM) and Transmission electron microscopy (TEM), in addition to spectroscopic methods including X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) methods. XRD and FTIR methods confirmed the formation of N-C/ZnCo2O4 nanostructures. Moreover, electron microscopy showed that the nanoflakes of N-C/ ZnCo2O4 with an average dimension of 22 nm formed on the electrode surface. Electrochemical studies revealed that the N-C/ZnCo2O4-based electrode maintains good electrochemical reversibility and excellent capacitive performance. A maximum specific capacitance of 1289 F g− 1 at 3.5 A g− 1 was obtained and supercapacitor maintained almost 86% of its initial capacitance after 2000 cycles. The electrochemical results showed that our electrode can be used as a promising electrode material for high-performance supercapacitor devices. A solid-state asymmetric supercapacitor (ASC) was fabricated using polyvinyl alcohol/KOH electrolyte, activated carbon, and N-C/ZnCo2O4 electrode. Our ASC device exhibited good electrochemical behavior with a high energy density of 41.9 Wh k g− 1 and excellent capacitance retention (94%) after 2000 cycles.
1 Introduction Nowadays, increasing demands for advanced electronic devices and portable electronics are driving forces to fabricate new high power density, ultrafast charge–discharge, and long cycle life energy system such as electrochemical supercapacitors (ESCs) [1–3]. The outstanding charge delivery in supercapacitors is commonly due to either double-layer charge storage (electrochemical double-layer capacitors) or fast surface redox reactions [4]. Simultaneously, great efforts have been made to enhance the power and energy Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10854-020-02993-9) contains supplementary material, which is available to authorized users. * Sayed Habib Kazemi [email protected] 1
Chemistry Department, Faculty of Science, Imam Khomeini International University, Qazvin 3414896818, Iran
Department of Chemistry, Institute for Advanced Studies in Basic Sciences(IASBS), Zanjan 45137‑66731, Iran
2
density of ESCs. To aim this purpose, prodigious attempts have been made to fabricate high-performance electrode materials. In this respect, carbon nanostructures (
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