Malaysian Journal of Analytical Sciences Vol 23 No 1 (2019): 60 - 70

HYDROGEN SORPTION OF MAGNESIUM OXIDE CARBON NANOFIBRE COMPOSITE

(Serapan Hidrogen pada Komposit Magnesium Oksida Nano-gentian Karbon)

Nurul Zafirah Abd. Khalim Khafidz¹, Zahira Yaakob^1,2, Sharifah Najiha Timmiati¹, Kuen-Song Lin³, Kean Long Lim^1*

¹Fuel Cell Institute

²Center for Sustainable Process Technology (CESPRO)

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

³Department of Chemical Engineering and Materials Science,

Yuan Ze University, Chung-Li City 320, Taiwan

*Corresponding author: kllim@ukm.edu.my

Received: 13 April 2017; Accepted: 17 April 2018

Abstract

Carbon nanofibres have high specific surface area to adsorb hydrogen on their surface and are widely investigated for hydrogen storage. Although carbon nanofibres can store a considerable amount of hydrogen, the adsorption of the latter must be conducted at cryogenic conditions. Here, MgO is proposed as a catalyst to improve the hydrogen storage performance of carbon nanofibres at room temperature because of the light weight MgO and its ability to dissociate hydrogen molecules. The magnesium oxide–carbon nanofibre (MgO–CNF) composite was prepared with polivinylpyrrolidone polymer and MgO via an electrospinner. The samples were characterised with field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and microgravimetric analysis. The MgO particles were formed on the surface and embedded inside the MgO–CNFs, thereby increasing the specific surface area. The as-synthesised MgO–CNFs with a specific surface area of 547 m²/g can store 2.54 wt.% of hydrogen at room temperature, showing more than 30% improvement as compared with that of CNFs.

Keywords: electrospinning, hydrogen storage, carbon nanofibre, metal oxide

Abstrak

Nano-gentian karbon mempunyai kelebihan dengan luas permukaan yang tinggi untuk menjerap hidrogen di atas permukaan nano-gentian karbon, berpotensi sebagai bahan penyimpanan hidrogen. Walaupun nano-gentian karbon mempunyai kebolehan untuk menyimpan hidrogen yang banyak, penjerapan hidrogen perlu dilakukan pada keadaan kriogenik. Di sini, magnesium oksida telah dicadangan sebagai pemangkin untuk meningkatkan prestasi nano-gentian karbon dalam penyimpanan hidrogen pada suhu bilik kerana ia adalah ringan dan berkebolehan untuk memisahkan molekul hidrogen. Komposit magnesium oksida nano-gentian karbon telah disediakan dengan polivinilpirolidon polimer dan magnesium oksida melalui kaedah elektroputaran. Sampel dicirikan dengan mikroskopi elektron pengimbasan pancaran medan, belauan sinar-X, spektroskopi inframerah transformasi Fourier, analisis termogravimetri, kalorimetri pengimbasan pembezaan dan mikrogravimetri. Zarah MgO terbentuk dipermukaan dan berada di dalam MgO–CNF telah meningkatkan spesifik luas permukaan. MgO–CNF dengan luas permukaan tentu 547 m²/g, berkebolehan menyimpan hidrogen sebanyak 2.54 wt.% pada suhu bilik, yang mana peratus peningkatan kapasiti penyimpanan hidrogen melebihi 30% berbanding dengan menggunakan CNF sahaja.

Kata kunci: elektroputaran, penyimpanan hidrogen, nano-gentian karbon, oksida logam

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