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Synthesis, characterizations, and supercapacitor performance of Ni-NiO@P(indole-4aminoquinaldine)

Rukan Suna Karatekin, Doğan Çirmi, Sedef Kaplan, Uğur Çağlayan, and Meltem Kahya Düdükcü

Department of Chemistry, Mersin University, Mersin, Turkey



Received: 7 March 2023  Accepted: 13 September 2023


In this study, the properties of the new polyindole-based copolymer, which was prepared and presented to the literature, were improved by the addition of methanol. Adding methanol into the monomer solution affected the particle size and conductivity of the copolymer. Adding 1 mL methanol increased the conductivity from 6 to 16 S/cm and particle size decreased from 700 to 400 nm and this new copolymer was labeled P(In-4aq)1. Ni/NiO was deposited electrochemically on P(indole-4aminoquinaldine)1-ITO (P(In-4aq)1) (and ITO and their comparison performance of the capacitor was performed. The deposition of Ni/NiO particles on P(In-4aq)1 significantly increased the charge/discharge time of the Ni/NiO@P(In-4aq)1 thanks to polymer properties. Ni/NiO gained higher crystallinity, stability, conductivity, and active surface area after being modified with polymer. It was found that the specific capacitance of Ni/NiO@P(In-4aq)1, Ni@/NiO, and P(In-4aq)1 of 445, 162, and 0.05 F g−1, respectively. In addition, the cyclic stability of Ni/NiO in the presence of the copolymer increased from 84 to 90% after 500 cycles.

Graphical Abstract

Keywords: Indole; Ni; NiO; Poly(indole-4aminoquinaldine); Supercapacitor

Full paper is available at

DOI: 10.1007/s11696-023-03087-6


Chemical Papers 77 (12) 7835–7847 (2023)

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