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Abstract

In this work, alginate doped with various contents of ammonium nitrate (NH4NO3) as a solid biopolymer electrolyte (SBE) was prepared via casting by using distilled water as a solvent. Impedance studies on alginate–NH4NO3 SBE films were conducted via impedance spectroscopy. The lowest bulk resistance (Rb) showed that the maximum ionic conductivity of the sample containing 25 wt.% NH4NO3 at ambient temperature (303 K) was 5.56 × 10−5 S cm−1. The temperature dependence of ionic conductivity was evaluated, and results confirmed that electrolytes followed an Arrhenius behavior. The highest conducting sample was fabricated into an electrical double-layer capacitor and characterized in terms of its electrochemical properties through cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) measurement. CV analysis indicated that specific capacitance decreased as the scan rate increased. Conversely, GCD analysis showed that specific capacitance almost remained unchanged for up to 5000 cycles.

Bahasa Abstract

Konduktivitas Ionik dan Sifat Elektrokimia dari Elektrolit Biopolimer Berbasis Alginate – NN4NO3 untuk Aplikasi EDLC. Dalam penelitian ini, alginate yang didoping dengan variasi konsentrasi dari amonium nitrat (NH4NO3) sebagai elektrolit biopolimer padat (SBE) di-casting dengan menggunakan air sebagai pelarutnya. Studi impedansi pada lapisan tipis SBE alginate-NH4NO3 dilakukan melalui spektroskopi impedansi. Hambatan limbak terendah (Bulk Resistance, Rb) menunjukkan bahwa konduktivitas ionik maksimum sampel yang mengandung 25% NH4NO3 pada suhu ambient (303 K) adalah 5,56 × 10 ×5 S cm−1. Hubungan antara suhu dan konduktivitas ionik dievaluasi dan hasilnya menunjukkan bahwa elektrolit mengikuti aturan Arrhenius. Sampel konduktor tertinggi difabrikasi menjadi kapasitor listrik double-layer dan dikarakterisasi sifat elektrokimianya dengan pengukuran cyclic voltammetry (CV) dan galvanostatic charge-discharge (GCD). Analisis CV menunjukkan bahwa kapasitansi spesifik menurun ketika laju pemindaian (scan rate) meningkat. Sebaliknya, analisis GCD menunjukkan bahwa kapasitansi spesifik hampir tidak berubah hingga 5000 siklus.

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