Rekayasa Parameter Sintesis dan Evaluasi Kinerja Gass Diffusion Electrode berbasis SnO2-Graphene untuk Reaksi Reduksi CO2

Fitrilya, Fitrilya (2026) Rekayasa Parameter Sintesis dan Evaluasi Kinerja Gass Diffusion Electrode berbasis SnO2-Graphene untuk Reaksi Reduksi CO2. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan emisi karbon dioksida (CO2) di atmosfer telah menjadi isu lingkungan global yang mendesak, sehingga diperlukan solusi inovatif dan berkelanjutan. Salah satu pendekatan menjanjikan adalah konversi elektrokimia CO2 menjadi produk bernilai tambah, seperti asam format (HCOOH), dengan memanfaatkan elektroda difusi gas (gas diffusion electrode, GDE) berbasis katalis aktif. Penelitian ini bertujuan untuk mensintesis dan mengevaluasi kinerja GDE berbasis SnO2-Graphene sebagai katoda pada reaktor PEM flow cell untuk reaksi reduksi CO2 (CO2RR). Sintesis dilakukan melalui elektrodeposisi SnO2 dari larutan prekursor SnCl2.2H2O, yang kemudian dilapisi graphene dengan metode electrophoretic deposition (EPD) dengan variasi tegangan dan waktu deposisisi. Karakterisasi material akan dilakukan menggunakan x-ray diffraction (XRD) dan field emission scanning elektron microscopy (FE-SEM), sedangkan evaluasi elektrokimia menggunakan electrochemical impedance spectroscopy (EIS), electrochemical surface area (ECSA), cyclic voltammetry (CV), linear polarization (LP), dan Chronoamperometry (CA) pada reaktor H-Cell. Selanjutnya, pengujian reaksi reduksi CO2 dilakukan pada reaktor (Proton Exchange Membrane) PEM flow-cell tiga kompartemen (anolyte compartement, catholyte compartement, dan CO2 compartement) dengan variasi laju alir elektrolit pada catholyte, konsentrasi larutan catholyte dan arus. Produk cair dianalisa menggunakan titrasi. Hasil penelitian menunjukkan bahwa kondisi optimum diperoleh pada tegangan EPD 60 V selama 15 menit, yang menghasilkan kinerja elektrokatalitik terbaik ditandai oleh arus reduksi tinggi, onset potential yang lebih positif, luas pemukaan aktif yang besar serta morfologi lapisan yang homogen. Selanjutnya, pengujian CO2RR pada reaktor PEM flow cell menunjukkan bahwa elektroda GDE SnO2/graphene mampu mencapai faradayc efficiency pembentukan HCOOH 66,60 % pada elektrolit KHCO₃ 0,5 M dengan kerapatan arus 1 mA·cm⁻² dan waktu tinggal reaktor 96 detik.
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The increasing concentration of carbon dioxide (CO2) in the atmosphere has become a critical global environmental issue, necessitating innovative and sustainable solutions. One promising approach is the electrochemical conversion of CO2 into value-added products, such as formic acid (HCOOH), using gas diffusion electrodes (GDEs) based on active catalysts. This study aims to synthesize and evaluate the performance of SnO2-graphene-based GDEs as cathodes in a proton exchange membrane (PEM) flow-cell reactor for the CO2 reduction reaction CO2RR). SnO2 was synthesized via electrodeposition from a SnCl2·2H2O precursor solution, followed by graphene coating using the electrophoretic deposition (EPD) method with variations in applied voltage and deposition time. Material characterization was carried out using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). At the same time, electrochemical performance was evaluated using electrochemical impedance spectroscopy (EIS), electrochemical surface area (ECSA), cyclic voltammetry (CV), linear polarization (LP), and chronoamperometry (CA) in an H-cell reactor. Subsequently, CO2RR testing was conducted in a three-compartment PEM flowcell reactor (anolyte, catholyte, and CO2 compartments) with variations in catholyte electrolyte flow rate, catholyte concentration, and applied current. Liquid products were analyzed by titration. The results indicate that the optimal condition was achieved at an EPD voltage of 60 V for 15 minutes, resulting in superior electrocatalytic performance characterized by a high reduction current, more positive onset potential, large electrochemically active surface area, and homogeneous coating morphology. Furthermore, CO2RR testing in the PEM flowcell reactor demonstrated that the SnO2/graphene GDE achieved a Faradaic efficiency for HCOOH formation of 66.60% in 0.5 M KHCO3 electrolyte at a current density of 1 mA.cm-2 and a reactor residence time of 96 seconds.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Gas diffusion electrode, SnO2, Graphene, electrophoretic deposition, reaksi reduksi CO2, dan asam format Gas diffusion electrode, SnO2, graphene, electrophoretic deposition, CO2 reduction reaction, dan formic acid.
Subjects:	Q Science Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD341.H9 Graphene Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis Q Science > QD Chemistry > QD569 Electrocatalysis.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	Fitrilya Fitrilya
Date Deposited:	02 Feb 2026 00:38
Last Modified:	02 Feb 2026 00:38
URI:	http://repository.its.ac.id/id/eprint/131419

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