Analisa Sifat Kapasitif Kapasitor Elektrokimia WO3 Hasil Sintesa Sol Gel dengan Variasi Temperatur Kalsinasi
Submission Date: 2013-08-15 11:02:04
Accepted Date: 2013-08-30 14:15:56
Abstract
Kapasitor elektrokimia merupakan salah satu jenis kapasitor yang memiliki densitas energi yang tinggi dan densitas daya yang tinggi. WO3 dikenal sebagai material semikonduktor yang mempunyai kemampuan untuk menyimpan energi listrik namun masih jarang diaplikasikan untuk kapasitor elektrokimia.
Tujuan dari penelitian ini adalah membuat dan menganalisa sifat kapasitif kapasitor elektrokimia dari material tungsten trioksida (WO)3. WO3 dapat disintesa menggunakan prekursor tungsten(VI) heksaklorida (WCl6) dan etanol(C2H5OH) dengan metode sol-gel, dilanjutkan dengan pelapisan gel WO3 pada substrat grafit dengan menggunakan alat spin coating. Sampel lalu dipanaskan dengan variasi temperatur kalsinasi 300oC, 350oC, 400oC dan 450oC selama waktu tahan 1 jam. Kemudian dikarakterisasi menggunakan uji SEM, XRD dan BET. Pengukuran kapasitansi kapasitor menggunakan uji cyclic voltametri. Dari hasil XRD diketahui struktur kristal WO3 temperatur kalsinasi 300oC, 350oC, 400oC dan 450oC adalah monoklinik. Dari hasil SEM didapatkan ukuran partikel yang semakin besar seiring kenaikan temperatur kalsinasi. Dari uji BET didapatkan luas permukaan aktif WO3 akan semakin kecil seiring kenaikan temperatur kalsinasi. Dari uji CV dihasilkan nilai kapasitif terbesar terdapat pada WO3 temperatur kalsinasi 300oC pada scan rate 2 mV/s yaitu sebesar 121,46 F/gr atau 242,92 mF/cm2Keywords
Kapasitor Elektrokimia; Tungsten Trioksida (WO3); Sol-gel; Kalsinasi; Cyclic Voltametri (CV)
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