Malaysian Journal of Analytical Sciences Vol 23 No 2 (2019): 197 - 203

ELECTROCHEMICAL PROPERTIES OF MESOPOROUS SILICA (SBA-15)-CARBON ELECTRODE

(Ciri Electrokimia Karbon Silica Berliang Meso)

Noramira Saad, Mohammad Noor Jalil*, Zainiharyati Mohd Zain, Hamizah Mohd Zaki

Faculty of Applied Science,
Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

*Corresponding author: moham423@salam.uitm.edu.my

Received: 19 August 2018; Accepted: 14 March 2019

Abstract

Mesoporous silica is material that possesses the pore sizes between 2 nm to 50 nm which had expanded their applications rapidly. In this study, mesostructured SBA-15 was synthesized and characterized then the electrochemical behaviour being analysed to determine the current signal and the impedance of mesoporous silica carbon electrode. The material with pore sizes 5.5 nm was successfully synthesized by surfactant templating technique, using triblock copolymer pluronic (P123) as directing agent and tetraethyl orthosilicate (TEOS) as silica sources. The synthesized SBA-15 was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption-desorption and infra-red (IR). Two different electrodes were fabricated which carbon paste electrode (CPE) and hybrid SBA-15 with carbon paste electrode (SBA-15/MCPE) and analysed using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The SBA-15/MCPE results better adsorption and enhanced the response signal to 30% and lower resistance compared to CPE with 179Ω and 187Ω respectively due to addition of meso-sites which improved the electron pathway This study demonstrates that mesoporous silica (SBA-15) can be considered as promising material in development of high performance, lightweight and flexible devices in electrochemistry.

Keywords: mesoporous silica, SBA-15, electrochemical properties, mesoporous silica-carbon electrode

Abstrak

Bahan berliang meso ialah bahan yang mempunyai saiz liang antara 2 nm hingga 50 nm yang telah dikembangkan aplikasinya secara meluas. Dalam kajian ini, SBA-15 berliang meso telah disintesis dan dicirikan. Setelah itu, sifat elektrokimianya di analisis. Bahan dengan liang bersaiz 5.5 nm berjaya disintesis melalui teknik templat surfaktan menggunakan triblok ko-polimer pluronic (P123) sebagai agen pengarah dan tetraetil ortosilikat (TEOS) sebagai sumber silica. Bahan yang disintesis dicirikan menggunakan teknik pembelauan sinar-X, mikroskopi imbasan elektron, penyerapan penjerapan nitrogen dan infra merah. Dua elektrod berbeza telah difabrikasikan, iaitu elektrod pes carbon (CPE) dan elektrod yang dimodifikasi (SBA-15/MCPE). Kedua-dua elektrod yang difabrikasi di analisa dengan menggunakan alat voltametri berkitar dan spektroskopi impedans elektrokimia. SBA-15/MCPE menawarkan penjerapan yang baik dan meningkatkan signal respon sehingga 30% dan menghasilkan rintangan yang lebih rendah berbanding CPE iaitu masing-masing 179Ω dan 187Ω. Kajian ini menunjukkan bahawa SBA-15 boleh dianggap sebagai bahan yang berpotensi dalam menghasilkan alat yang berprestaai tinggi, ringan dan flexibel dalam electrokimia.

Kata kunci: silica berliang meso, SBA-15, pencirian elektrokimia, elektrod karbon-silika berliang meso

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