Vatansever D., Hacıismailoğlu M.
ELECTROCHIMICA ACTA, cilt.536, ss.146748, 2025 (SCI-Expanded)
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Yayın Türü:
Makale / Tam Makale
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Cilt numarası:
536
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Basım Tarihi:
2025
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Doi Numarası:
10.1016/j.electacta.2025.146748
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Dergi Adı:
ELECTROCHIMICA ACTA
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Derginin Tarandığı İndeksler:
Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
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Sayfa Sayıları:
ss.146748
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Bursa Uludağ Üniversitesi Adresli:
Evet
Özet
Polypyrrole (PPy) was electropolymerized on disposable pencil graphite (G), and then Ni-oxide (NiO) was electrodeposited on G/PPy varying the charge density from 14 to 562 mC/cm2. The molecular structure was studied by Fourier transform infrared spectroscopy. The morphology was investigated by scanning electron microscopy and the composition was determined by energy-dispersive X-ray spectrometry. The capacitive behavior was examined by cyclic voltammetry (CV) and galvanostatic charge-discharge technique (GCD). The specific capacitance was calculated as 570.4 F/g for the G/PPy-NiO electrode having NiO with a charge density of 14 mC/cm2. As the charge density increases the specific capacitance decreases. Supercapacitors were fabricated using these G/PPy-NiO electrodes, and PVA-H2SO4 and PVA-H3PO4 gel electrolytes. The capacitive behavior was analyzed using CV and GCD. The calculated specific capacitance is 403.4 F/g for the PPy-NiO-14//PVA-H2SO4//PPy-NiO-14 and 44.4 F/g for PPy-NiO-14//PVA-H3PO4//PPy-NiO-14 supercapacitors. The devices were aged by keeping them at room conditions, and the measurements were repeated every 15 days until the 45th day. The cyclic stability was determined after 1000 cycles by CV measured on the 0th and 45th day. The capacitance retention and hence the shelf life were determined. PPy-NiO-14//PVA-H2SO4//PPy-NiO-14 supercapacitor has capacitance retention (c.t.) of 101 % after 45 days while the PPy-NiO-14//PVA-H3PO4//PPy-NiO-14 has 75.5 %.
Polypyrrole (PPy) was electropolymerized on disposable pencil graphite (G), and then Ni-oxide (NiO) was electrodeposited on G/PPy varying the charge density from 14 to 562 mC/cm2. The molecular structure was studied by Fourier transform infrared spectroscopy. The morphology was investigated by scanning electron microscopy and the composition was determined by energy-dispersive X-ray spectrometry. The capacitive behavior was examined by cyclic voltammetry (CV) and galvanostatic charge-discharge technique (GCD). The specific capacitance was calculated as 570.4 F/g for the G/PPy-NiO electrode having NiO with a charge density of 14 mC/cm2. As the charge density increases the specific capacitance decreases. Supercapacitors were fabricated using these G/PPy-NiO electrodes, and PVA-H2SO4 and PVA-H3PO4 gel electrolytes. The capacitive behavior was analyzed using CV and GCD. The calculated specific capacitance is 403.4 F/g for the PPy-NiO-14//PVA-H2SO4//PPy-NiO-14 and 44.4 F/g for PPy-NiO-14//PVA-H3PO4//PPy-NiO-14 supercapacitors. The devices were aged by keeping them at room conditions, and the measurements were repeated every 15 days until the 45th day. The cyclic stability was determined after 1000 cycles by CV measured on the 0th and 45th day. The capacitance retention and hence the shelf life were determined. PPy-NiO-14//PVA-H2SO4//PPy-NiO-14 supercapacitor has capacitance retention (c.t.) of 101 % after 45 days while the PPy-NiO-14//PVA-H3PO4//PPy-NiO-14 has 75.5 %.