Mutua, Hellen NgunyaTarimo, Delvina JaphetRutavi, GiftMaphiri, Vusani M.Mwabora, JuliusMusembi, Robinson J.Manyala, Ncholu I.2025-02-182025-01Mutua, H.N., Tarimo, D.J., Rutavi, G. et al. 2025, 'A novel study on chronoamperometry electrodeposition of hexagonal boron nitride with Eucalyptus grandis-derived activated carbon for supercapacitor applications', Journal of Energy Storage, vol. 107, art. 114968, pp. 1-14, doi : 10.1016/j.est.2024.114968.2352-152X (online)10.1016/j.est.2024.114968http://hdl.handle.net/2263/101021DATA AVAILABILITY : Data will be made available on request.Activated carbon (AC) and hexagonal boron nitride (hBN) electrodes were successfully synthesized from Eucalyptus grandis tree bark and a mixture of boric acid and urea in the ratio of 2:3, respectively. The optimal composite hBN/AC-1:0.05 electrode was prepared by chronoamperometry electrodeposition at an optimal potential of 0.45 V for 60 min. The prepared electrodes were analyzed using Raman spectroscopy, Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Energy Dispersive X-ray spectroscopy (EDS). Half- and full-cell setups were used to investigate the as-prepared AC, hBN, and hBN/AC composite electrodes in 3 M KOH for electrochemical characterization. A supercapacitor was assembled using hBN/AC-1:0.05//AC. The device displayed a specific energy of 24.1 Wh/kg and a corresponding specific power of 1025 W/kg at 1 A/g in a potential window of 1.6 V. Furthermore, the developed device demonstrated a coulombic efficiency of 99.4 % and a capacity retention of 76.3 % after 10,000 GCD cycles at 5 A/g. The results of hBN/AC-1:0.05//AC contribute to the scientific community by highlighting the importance of biomass recycling (Eucalyptus grandis tree bark) and providing a simple approach to producing a composite material for energy storage.en© 2025 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. Notice : this is the author’s version of a work that was accepted for publication in Journal of Energy Storage. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Journal of Energy Storage, vol. 107, art. 114968, pp. 1-14, doi : 10.1016/j.est.2024.114968.Activated carbon (AC)Hexagonal boron nitride (hBN)Eucalyptus grandis tree barkEnergy dispersive X-ray spectroscopy (EDS)Raman spectroscopyScanning electron microscopy (SEM)Fourier transform infrared (FTIR)X-ray diffraction (XRD)Energy storageElectrodepositionSupercapacitorSDG-07: Affordable and clean energySDG-09: Industry, innovation and infrastructurePostprint Article