Pengaruh Konsentrasi Kobalt Terhadap Performa Katalis CoCN@Ni-Foam Untuk Aplikasi Water Splitting

Kusumo, Rifal Herlambang (2026) Pengaruh Konsentrasi Kobalt Terhadap Performa Katalis CoCN@Ni-Foam Untuk Aplikasi Water Splitting. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5011221158-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (3MB) | Request a copy

Abstract

Water splitting merupakan proses elektrokimia untuk memisahkan molekul air menjadi gas hidrogen pada katode melalui hydrogen evolution reaction (HER) dan gas oksigen pada anode melalui oxygen evolution reaction (OER). Proses ini membutuhkan elektrokatalis untuk menurunkan overpotensial dan mempercepat laju reaksi. Penelitian ini bertujuan menganalisis pengaruh variasi konsentrasi prekursor Co(NO₃)₂·6H₂O terhadap karakteristik material dan aktivitas elektrokatalitik Co(OH)₂@Ni-Foam, ZIF-67@Ni-Foam, dan CoCN@Ni-Foam. Konsentrasi prekursor divariasikan sebesar 0,03; 0,05; 0,10; dan 0,15 M. Sintesis dilakukan melalui elektrodeposisi Co(OH)₂ pada Ni-Foam, pembentukan ZIF-67 menggunakan 2-metilimidazol, dan perlakuan panas dalam atmosfer nitrogen untuk menghasilkan CoCN. Karakterisasi material dilakukan menggunakan XRD, FTIR, dan SEM, sedangkan aktivitas elektrokatalitik dianalisis melalui LSV, overpotensial, dan Tafel slope. Hasil XRD pada sampel 0,10 M menunjukkan bahwa pola difraksi masih didominasi oleh fase kristalin Ni-Foam, sedangkan lapisan aktif memiliki kristalinitas relatif rendah. Hasil FTIR menunjukkan perubahan lingkungan ikatan kimia dari Co(OH)₂ menuju ZIF-67 dan CoCN, sementara citra SEM memperlihatkan perubahan morfologi dari struktur nanosheet menjadi kristal polihedral dan struktur granular berpori. Variasi konsentrasi memengaruhi kerapatan, keseragaman, dan tingkat aglomerasi material. Pada HER, Co(OH)₂@Ni-Foam-0,15 M menghasilkan overpotensial terendah sebesar 255 mV, sedangkan CoCN@Ni-Foam-0,15 M memiliki Tafel slope terendah sebesar 99,9 mV dec⁻¹ di antara variasi CoCN. Pada OER, CoCN@Ni-Foam-0,15 M menunjukkan performa terbaik dengan overpotensial 361 mV dan Tafel slope 99,7 mV dec⁻¹. Hasil penelitian menunjukkan bahwa konsentrasi prekursor memengaruhi morfologi dan aktivitas elektrokatalitik setiap tahap material, dengan konsentrasi 0,15 M memberikan performa terbaik pada material akhir CoCN@Ni-Foam dalam rentang konsentrasi yang diuji.
=========================================================================================================================================
Water splitting is an electrochemical process that separates water molecules into hydrogen gas at the cathode through the hydrogen evolution reaction (HER) and oxygen gas at the anode through the oxygen evolution reaction (OER). This process requires electrocatalysts to reduce overpotential and accelerate both reactions. This study aimed to analyze the effect of Co(NO₃)₂·6H₂O precursor concentration on the material characteristics and electrocatalytic activity of Co(OH)₂@Ni-Foam, ZIF-67@Ni-Foam, and CoCN@Ni-Foam. The precursor concentrations were varied at 0.03, 0.05, 0.10, and 0.15 M. The materials were synthesized through electrodeposition of Co(OH)₂ on Ni-Foam, formation of ZIF-67 using 2-methylimidazole, and heat treatment under a nitrogen atmosphere to produce CoCN. Material characterization was performed using X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy, while electrocatalytic activity was evaluated using linear sweep voltammetry, overpotential, and Tafel slope analyses. The XRD results of the 0.10 M sample showed that the diffraction pattern was dominated by crystalline Ni-Foam, whereas the active layer exhibited relatively low crystallinity. The FTIR spectra indicated changes in the chemical bonding environment from Co(OH)₂ to ZIF-67 and CoCN, while the SEM images revealed a morphological transformation from nanosheet structures to polyhedral crystals and porous granular structures. The precursor concentration affected the density, uniformity, and degree of material agglomeration. For HER, Co(OH)₂@Ni-Foam-0.15 M exhibited the lowest overpotential of 255 mV, while CoCN@Ni-Foam-0.15 M showed the lowest Tafel slope of 99.9 mV dec⁻¹ among the CoCN variations. For OER, CoCN@Ni-Foam-0.15 M demonstrated the best performance, with an overpotential of 361 mV and a Tafel slope of 99.7 mV dec⁻¹. These results indicate that precursor concentration influences the morphology and electrocatalytic activity of each material stage, with 0.15 M providing the best performance for the final CoCN@Ni-Foam material within the investigated concentration range.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Water Splitting, CoCN, Ni-foam, Konsentrasi Kobalt, Elektrokatalisis, ZIF-67, Water Splitting, CoCN, Ni-Foam, precursor concentration, electrocatalysis
Subjects:	Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis Q Science > QD Chemistry > QD569 Electrocatalysis.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Rifal Herlambang Kusumo
Date Deposited:	31 Jul 2026 01:50
Last Modified:	31 Jul 2026 01:50
URI:	http://repository.its.ac.id/id/eprint/137802

Actions (login required)

View Item