Rekayasa Flow-Electrolyzer Karbon Dioksida Dengan Katalis Oksida Timah Binderless

Ardiansyah, Rafly Putra (2025) Rekayasa Flow-Electrolyzer Karbon Dioksida Dengan Katalis Oksida Timah Binderless. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Reduksi gas CO2 (CO2RR) secara elektrokimia menjadi bahan kimia bernilai tambah seperti asam format berpotensi memenuhi kebutuhan energi yang selalu meningkat serta dapat diintegrasikan dengan sumber energi baru-terbarukan untuk mengurangi emisi karbon dioksida. Namun, pengadopsian teknologi ini dalam skala industri masih terhalang oleh capital cost dan harga produk yang tinggi yang diakibatkan oleh rendahnya Faradaic Efficiency dan rapat arus electrolyzer karena kompetisi CO2RR dengan Hydrogen Evolution Reaction (HER). Penelitian ini dilakukan untuk menginvestigasi desain serta kondisi operasi reaktor Flow-electrolyzer CO2 menggunakan katoda logam timah (Sn) yang dielektrodeposisikan pada substrat Carbon Paper untuk mendapatkan Gas Diffusion Electrode (GDE) dengan variasi tegangan dan lama deposisi. Uji elektrokimia setengah sel dilakukan pada katoda SnO2 menggunakan Linear Sweep Voltametry (LSV), Linear Polarization (LP), dan Electrochemical Impedance Spectroscopy (EIS). Kemudian, katoda dikarakterisasi menggunakan X-Ray Diffraction (XRD) dan Scanning Electron Microscopy (SEM) untuk menganalisa morfologi partikel yang terdeposisi. Pengujian performa elektrolisis CO2 dilakukan pada flow-electrolyzer menggunakan anoda NiFe dan katolit KHCO3 serta anolit KOH dengan variasi kondisi operasi berupa laju alir dan konsentrasi katolit. GDE yang disintesis dengan tegangan 6 V dan durasi 10 menit menunjukkan onset potential yang rendah dan densitas arus yang tinggi sehingga cocok digunakan untuk katalis reduksi CO2. Kondisi operasi flow-electrolyzer yang berhasil menunjukkan efisiensi faraday dan selektivitas tertinggi dalam mereduksi CO2 menjadi ion format yaitu dengan laju aliran elektrolit 15 mL/min dan konsentrasi elektrolit 0,5 M KHCO3.
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The electrochemical reduction of CO2 gas (CO2RR) into value-added chemicals such as formic acid has the potential to address rising energy demands while integrating with renewable energy sources to reduce carbon dioxide emissions. However, large-scale industrial adoption of this technology remains hindered by high capital costs and product prices, primarily due to low Faradaic efficiency and electrolyzer current density caused by competition between CO2RR and the hydrogen evolution reaction (HER). This study investigates the design and operational conditions of a CO2 flow-electrolyzer reactor using a tin (Sn) metal cathode electrodeposited on a carbon paper substrate to produce gas diffusion electrodes (GDEs) with variations in voltage and deposition time. Half-cell electrochemical tests were conducted on SnO2 cathodes using linear sweep voltammetry (LSV), linear polarization (LP), and electrochemical impedance spectroscopy (EIS). The cathodes were further characterized via X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze deposited particle morphology. CO2 electrolysis performance was tested in a flow-electrolyzer system with a NiFe anode and KHCO3 catholyte and KOH anolyte under varying operational conditions (catholyte flow rate and concentration). The GDE synthesized at 6 V for 10 minutes exhibited a low onset potential and high current density, making it suitable as a CO2 reduction catalyst. The optimal flow-electrolyzer operating conditions, achieving the highest Faradaic efficiency and selectivity for CO2 reduction to formate ions, were obtained at an electrolyte flow rate of 15 mL/min using a 0,5 M KHCO3 electrolyte concentration.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	CO2 Reduction Reaction (CO2RR), Elektrodeposisi, Flow-electrolyzer, GDE, Sn, CO2 Reduction Reaction (CO2RR), Electrodeposition, Flow-electrolyzer, GDE, Sn
Subjects:	Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis
Divisions:	Faculty of Industrial Technology > Chemical Engineering > 24101-(S2) Master Thesis
Depositing User:	Rafly Putra Ardiansyah
Date Deposited:	04 Aug 2025 10:47
Last Modified:	04 Aug 2025 10:47
URI:	http://repository.its.ac.id/id/eprint/126158

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