This study aims to produce a solid biopolymer electrolyte (SBE) by doping ammonium chloride (NH4Cl) into alginate. Solution casting was used to prepare the alginate–NH4Cl SBE system. Electrical impedance spectroscopy was performed to analyze the electrical properties of the SBE under the applied frequency range of 50 Hz–1 MHz. The incorporation of 8 wt.% NH4Cl enhances the ionic conductivity of the SBE up to 3.18 × 10-7 S/cm at ambient room temperature. Fourier transform infrared spectroscopy shows that complexation occurs between the hydroxyl (-OH), carboxylate (COO-) and ether linkage (C-O-C) functional groups due to the formation of inter- and intra-molecular hydrogen bonds between the biopolymer and the ionic dopant. The dielectric constant and dielectric loss increase with increasing dopant composition, thereby increasing the number of charge carriers and ionic mobility.

Bahasa Abstract

Konduktivitas Ion Elektrolit Polimer Alginat-NH4Cl. Kajian ini bertujuan untuk memproduksi suatu elektrolit polimer hayati padat (solid biopolymer electrolyte (SBE)) dengan mendoping amonia klorida (NH4Cl) ke dalam alginat. Penuangan larutan digunakan untuk membuat sistem SBE alginat–NH4Cl. Spektroskopi impedansi listrik dilaksanakan untuk menganalisis sifat-sifat listrik SBE pada kisaran frekuensi yang digunakan 50 Hz–1 MHz. Pemasukan 8% berat NH4Cl meningkatkan konduktivitas ion SBE sampai 3,18 × 10-7 S/cm pada temperatur ruang lingkungan sekitar. Spektroskopi infra mearh transformasi Fourier menunjukkan bahwa terjadi kompleksitas antara gugus-gugus fungsional hidroksil (-OH), karboksilat (COO-) dan ikatan eter (C-O-C) akibat pembentukan ikatan-ikatan hidrogen intar- dan intra-molekul antara polimer hayati (biopolimer) dan dopan ion. Konstanta dielektrik dan kerugian dielektrik meningkat dengan peningkatan komposisi dopan, dengan demikian meningkatkan jumlah pembawa muatan dan mobilitas ion.


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