Konduktivitas Apatit Lantanum Silikat La9.33Si6O26 Hasil Sintesis Hidrotermal dengan Mineraliser NaOH dan KOH

Atiek Rostika Noviyanti, Dani Gustaman Syarif, Riansyah Amynurdin, Iwan Hastiawan, Iman Rahayu, Yati B. Yuliyati

Abstract

Apatit lantanum silikat banyak digunakan sebagai elektrolit pada sel bahan bakar padatan (SOFC). Beberapa oksida apatit lantanum silikat La9.33Si6O26 telah disintesis dengan metode hidrotermal guna mengamati pentingnya peranan mineraliser terhadap karakternya. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan konsentrasi mineraliser terhadap kristalinitas, ukuran partikel dan hubungannya dengan sifat konduktivitas oksida apatit lantanum silikat. Struktur, ukuran partikel dan konduktivitas oksida apatit masing-masing dikarakterisasi dengan XRD, PSA dan spektroskopi impedansi. Oksida apatit lantanum silikat diperoleh dengan melarutkan La2O3 dan Na2SiO3 dengan mol ratio 1,555 menggunakan mineraliser NaOH (3-5 M) dan KOH (0,3-0,7 M). Hasil penelitian menunjukkan bahwa kinerja elektrolit sangat ditentukan oleh kristalinitas dan morfologi apatit lanthanum silikat yang dipengaruhi oleh jenis dan konsentrasi mineralizer. Ukuran apatit lantanum silikat terkecil diperoleh dari hasil sintesis dengan menggunakan mineraliser NaOH 3 M yaitu 1,7889 µm, dengan nilai konduktivitas tertinggi yaitu 1,99×10-6 S/cm pada suhu operasi 600 ºC. Berdasarkan hasil tersebut NaOH 3 M merupakan mineraliser yang paling baik untuk menghasilkan apatit lanthanum silikat La9.33Si6O26.

Conductivity of Lanthanum Silicate Apatite Phase of La9.33Si6O26Prepared by Hydrothermal Synthesis using NaOH and KOH as Mineralizer. Lanthanum silicates are used as electrolytes in solid oxide fuel cells (SOFC). Some oxide-based apatite has been synthesized by hydrothermal method to observe mineralizer effect on the process of crystallization. The effect of type and amount of mineralizers for preparing apatite –type lanthanum silicate of La9.33Si6O26 was investigatedon its crystallinity, particle size, as well as on the conductivity properties relationship were investigated. The structure, particle size and conductivity of La9.33Si6O26 was characterized using X-ray diffraction, particle size analyzer and impedance spectroscopy respectively. The results show that the electrolyte performance is strongly dependent on the crystallinity and the morphology textural of lanthanum silicate apatite affected by the type and amount of mineralizer. The lanthanum silicate apatiteprepared by La2O3 and Na2SiO3 (molar ratio of La2O3 and Na2SiO3 = 1.555), and NaOH (3; 4; 5 M) and KOH (0,3-0,7 M) as mineralizer. As a result, apatite-type lanthanum silicate was prepare using NaOH 3 M shows smallest particle (1.7889 μm) and highest conductivity (1.99 × 10-6 S / cm at 600 ºC). With respect to both particle size and conductivity, the NaOH 3 M can be selected as a suitable type and amount mineralizer for the preparation of excellent lanthanum silicate apatite La9.33Si6O26. 

Apatitlantanumsilikatbanyakdigunakansebagaielektrolitpadasel bahanbakarpadatan(SOFC). BeberapaoksidaapatitlantanumsilikatLa9.33Si6O26 telahdisintesisdenganmetodehidrotermalguna mengamati pentingnyaperananmineraliserterhadapkarakternya.Penelitianini bertujuanuntukmengetahui pengaruhjenisdan konsentrasi mineraliserterhadapkristalinitas,ukuran partikel danhubungannyadengan sifatkonduktivitasoksidaapatitlantanumsilikat.Struktur,ukuranpartikel dankonduktivitasoksidaapatit masing-masingdikarakterisasidenganXRD,PSAdan spektroskopiimpedansi.Oksidaapatitlantanumsilikat diperolehdenganmelarutkan La2O3danNa2SiO3denganmolratio1,555 menggunakanmineraliserNaOH (3-

5M)danKOH(0,3-0,7M).Hasilpenelitianmenunjukkanbahwakinerjaelektrolitsangatditentukanoleh kristalinitasdanmorfologiapatitlanthanumsilikatyangdipengaruhiolehjenisdankonsentrasimineralizer.

UkuranapatitlantanumsilikatterkecildiperolehdarihasilsintesisdenganmenggunakanmineraliserNaOH3

Myaitu1,7889µm,dengannilaikonduktivitastertinggiyaitu1,99×10-6S/cmpadasuhuoperasi600ºC. BerdasarkanhasiltersebutNaOH3Mmerupakanmineraliseryangpalingbaikuntukmenghasilkanapatit

lanthanumsilikatLa9.33Si6O26.

Keywords

apatit lantanum silikat; mineraliser; kristalinitas; ukuran partikel; konduktivitas

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DOI: https://doi.org/10.20961/alchemy.14.1.8468.1-15

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