Modification Graphite Felt Electrode By Three Dimensionally Ordered Macroporous Magnesium Cobalt Oxide For Vanadium Redox Flow Battery

Raihan, Johan Nabiel (2025) Modification Graphite Felt Electrode By Three Dimensionally Ordered Macroporous Magnesium Cobalt Oxide For Vanadium Redox Flow Battery. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Vanadium redox flow batteries (VRFBs) are a promising solution for large-scale energy storage due to their scalability, long cycle life, and safety. However, the efficiency of VRFBs is significantly influenced by the performance of the electrode materials. This study focuses on the modification of graphite felt (GF) electrodes using three-dimensionally ordered macroporous magnesium cobalt oxide (3DOM MgCo2O4) to enhance electrochemical performance. The 3DOM MgCo2O4 was synthesized with varying metal precursor ratios (2:1, 1:1, and 1:2) and calcined at different temperatures (350°C, 400°C and 450°C) to investigate the effects of these parameters on material properties and performance. At a high current density of 160 mA cm−2, the VRFB cell using the 3DOM MgCo2O4-HGF electrode achieved an energy efficiency (EE) of 74.57%, representing notable improvements of 9.78% over the HGF (64.79%) electrode. Remarkably, the cell maintained stable performance over 500 continuous charge-discharge cycles, confirming the electrode’s excellent long-term durability. The enhanced performance of the 3DOM MgCo2O4-HGF is attributed to the synergistic interplay between magnesium and cobalt, interconnected 3D network, increased oxygen vacancy concentration, improved surface wettability, and a larger specific surface area. These features collectively promote efficient charge transport and provide abundant active sites for redox reactions. This work offers significant contributions to the design of high-performance electrode materials for advanced energy storage systems.
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Vanadium redox flow battery (VRFB) merupakan solusi yang menjanjikan untuk penyimpanan energi skala besar karena skalabilitasnya, umur siklus yang panjang, dan keamanannya. Namun, efisiensi VRFB sangat dipengaruhi oleh kinerja material elektroda. Penelitian ini berfokus pada modifikasi elektroda graphite felt (GF) menggunakan magnesium cobalt oksida dengan struktur makropori tiga dimensi teratur (3DOM MgCo2O4) untuk meningkatkan performa elektrokimia. Material 3DOM MgCo2O4 disintesis dengan variasi rasio prekursor logam (2:1, 1:1, dan 1:2) dan dikalsinasi pada suhu yang berbeda (350°C, 400°C dan 450°C) untuk menyelidiki pengaruh parameter tersebut terhadap sifat material dan performanya. Pada kerapatan arus tinggi 160 mA cm−2, sel VRFB yang menggunakan elektroda 3DOM MgCo2O4-HGF mencapai efisiensi energi (EE) sebesar 74,57%, yang menunjukkan peningkatan signifikan sebesar 9,78% dibandingkan elektroda HGF (64,79%). Hebatnya, sel mempertahankan kinerja yang stabil selama 500 siklus pengisian-pengosongan daya berkelanjutan, yang menegaskan ketahanan jangka panjang elektroda yang sangat baik. Peningkatan kinerja 3DOM MgCo2O4-HGF disebabkan oleh interaksi sinergis antara magnesium dan kobalt, jaringan 3D yang saling terhubung, peningkatan konsentrasi kekosongan oksigen, peningkatan keterbasahan permukaan, dan luas permukaan spesifik yang lebih besar. Fitur ini secara kolektif meningkatkan transportasi muatan yang efisien dan menyediakan banyak situs aktif untuk reaksi redoks. Karya ini menawarkan kontribusi signifikan terhadap desain material elektroda berkinerja tinggi untuk sistem penyimpanan energi tingkat lanjut.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Catalyst, Electrode, Vanadium Redox Flow Battery,Elektroda, Katalis, Vanadium Redox Flow Battery.
Subjects:	Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD569 Electrocatalysis. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2941 Storage batteries
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User:	Johan Nabiel Raihan
Date Deposited:	04 Aug 2025 10:01
Last Modified:	04 Aug 2025 10:01
URI:	http://repository.its.ac.id/id/eprint/124483

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