Research Project: Borür-Karbür Tabanlı İşlevsel Micro/Nano Kompozitlerin Elementel Bordan Yola Çıkarak Verimli Tekinklerle Geliştirilmesi
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Contributors
Funders
ID
TB.00614
Authors
Balcı, Özge
Researcher
Publications
Durable ZrB2-ZrC composite materials as advanced electrodes for high-performance supercapacitors
(American Chemical Society (ACS), 2025) Paksoy, Aybike; Gungor, Ahmet; Yildirim, Ipek Deniz; Arabi, Seyedehnegar; Erdem, Emre; Balci-Cagiran, Ozge; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); No; Paksoy, Aybike; Research Center
Boride and carbide-based materials attract increasing attention as promising options for energy storage applications. This research focuses on synthesizing pure boride and carbide compounds of zirconium (ZrB2 and ZrC) and their composite powders using mechanical activation-assisted route and subsequent heating processes. The chemical and microstructural characterization results indicate that the synthesized composite powders are of high purity, possess submicron-scale particle sizes (below 400 nm), and exhibit a high surface area of up to 9.41 m2/g. Supercapacitor devices, using the resulting powders as symmetrical electrodes, exhibit high energy density values ranging from 5.8 to 8.8 Wh/kg. The ZrB2-15 wt % ZrC composite sample achieves the highest power density at 155 W/kg, compared to 118 W/kg for the pure ZrB2 sample. Cycling tests demonstrate exceptional capacitance retention (99.4-99.9%) and cyclic stability, even after 5000 cycles, highlighting the high durability of the composite samples. These findings show that ZrB2-ZrC composites exhibit high energy and power density values and excellent cycling performance, making them strong candidates for use in high-performance supercapacitor devices.
Synthesis and capacitive performance of ZrB2 and its composites as supercapacitor electrodes
(Elsevier, 2023) Arabi, Seyedehnegar; Paksoy, Aybike; Balcı, Özge; Buldu-Akturk, Merve; Erdem, Emre; Department of Chemistry; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); Graduate School of Sciences and Engineering; No; College of Sciences; Research Center; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
The possibility of using zirconium diboride (ZrB2) as an electrode for supercapacitor devices has yet to be extensively studied, even though there is a wealth of literature on various properties of ZrB2. In this study, ZrB2 and its composites were directly assembled as electrode materials into symmetric and asymmetric supercapacitor devices. ZrB2 powders were synthesized by using mechanical activation assisted direct synthesis route followed by a purification step. Powders were illustrated with precise size tuning in the 200-500 nm range. Then, the ZrB2-based composite materials containing silicon carbide (SiC) particles were prepared by using a mechanical alloying process. Microstructural and thermal analyses of the particles were carried out and optimum powders were selected for the measurements of electrochemical performance. Both symmetric and asymmetric supercapacitors exhibited excellent cycling performances: After 50 cycles, the devices display 79 and 69% capacitance retention as well as 108 and 123% coulombic efficiency at 0.1 A g-1, respectively for the symmetric ZrB2/ZrB2 and asymmetric ZrB2/ZrB2-15 wt%SiC supercapacitors. The symmetric supercapacitor exhibited higher performance than asymmetric one with a specific energy and power density of 4.2 W h kg-1 and 150 W kg-1, respectively. As a result, high energy density and high capacity values, and excellent cycling performances are obtained, meaning that ZrB2 and its composites are promising materials for energy storage purposes.
