Studi Eksperimen Pengaruh Katalis Karbon Terhadap Desorpsi Sodium Borohydride (NaBH4) Sebagai Penyimpanan Hidrogen

Ramadhan, Yun Ridhwan (2025) Studi Eksperimen Pengaruh Katalis Karbon Terhadap Desorpsi Sodium Borohydride (NaBH4) Sebagai Penyimpanan Hidrogen. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5007211151-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (6MB) | Request a copy

Abstract

Sodium Borohydride (NaBH4) merupakan salah satu kandidat material penyimpanan hidrogen padat yang menjanjikan dengan kapasitas teoritisnya sebesar 10,6 wt%. Namun, penggunaan NaBH4 masih terbatas oleh kinetika desorpsi yang lambat dan suhu desorpsi yang tinggi (505 °C). Maka dari itu, dipilihlah katalis Carbon Black (CB) dan Multi-walled Carbon Nanotubes (MWCNTs) karena memiliki beberapa keunggulan sebagai katalis untuk NaBH4. Dalam studi ini, pengujian dilakukan menggunakan metode Temperature Programmed Desorption (TPD) untuk mengamati karakteristik pelepasan hidrogen, serta teknik Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (SEM-EDS) untuk menganalisis morfologi permukaan sampel dan mengidentifikasi komposisi unsur dari sampel. Hasil penelitian diharapkan dapat memberikan wawasan mengenai peningkatan pelepasan NaBH4 melalui penggunaan katalis karbon serta pengaruh laju suhu terhadap kinerja penyimpanan hidrogen. Laju pemanasan optimal 5 °C/menit pada katalis NaBH4/MWCNTs terbukti krusial, menghasilkan pelepasan hidrogen maksimal 6,08 wt% dengan energi aktivasi total sebesar 65,850 kJ/mol melampaui NaBH4 murni maupun NaBH4/CB. Penyimpangan laju pemanasan, baik terlalu lambat (3 °C/menit) yang membentuk Na2B12H12 maupun terlalu cepat (10 dan 15 °C/menit) yang menyebabkan thermal lag, secara signifikan mengurangi jumlah hidrogen yang dilepaskan. Peran katalis MWCNTs dalam mencegah aglomerasi dan meratakan distribusi panas, seperti yang terlihat pada SEM-EDS, menjadi kunci peningkatan efisiensi desorpsi ini.
=========================================================================================================================================
Sodium Borohydride (NaBH4) is a promising solid-state hydrogen storage material candidate, possessing a high theoretical capacity of 10.6 wt%. However, its practical application is limited by slow desorption kinetics and a high desorption temperature of 505 °C. Therefore, Carbon Black (CB) and Multi-walled Carbon Nanotubes (MWCNTs) were selected as catalysts due to their distinct advantages for enhancing NaBH4 performance. In this study, experiments were conducted using the Temperature Programmed Desorption (TPD) method to observe the hydrogen release characteristics. Additionally, Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS) was employed to analyze the surface morphology and identify the elemental composition of the samples. The results are expected to provide insights into improving NaBH₄ desorption through the incorporation of carbon catalysts and to clarify the effect of the heating rate on hydrogen storage performance. An optimal heating rate of 5 °C/min was found to be crucial for the NaBH₄/MWCNTs catalyst, achieving a maximum hydrogen release of 6.08 wt% with a total activation energy of 65.850 kJ/mol, thereby outperforming both pure NaBH4 and NaBH4/CB. Deviations from this rate were detrimental: a slower rate (3 °C/min) promoted the formation of Na2B12H12, while faster rates (10 and 15 °C/min) induced thermal lag, both of which significantly decreased the total hydrogen yield. As observed via SEM-EDS, the MWCNT catalyst's ability to prevent agglomeration and promote even heat distribution was key to this enhanced desorption efficiency.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Katalis, Penyimpanan Hidrogen, SEM-EDS, Sodium Borohydride, TPD. Catalyst, Hydrogen Storage, SEM-EDS, Sodium Borohydride, TPD
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Yun Ridhwan Ramadhan
Date Deposited:	04 Aug 2025 06:53
Last Modified:	04 Aug 2025 06:53
URI:	http://repository.its.ac.id/id/eprint/127003

Actions (login required)

View Item