3890689045

Materials Science Forum    Suhmitted: 2019-08-22

ISSN: 1662-9752. Vd. IOW. pp 501-507    Rerised: 2020-02-18

doi:l0.4028/www.scientific.net/MSF. 1010.501    Accepted: 2020-02-18

& 2020 Trans Tech Puhlications Ud. Siritzeriand    Online: 2020-09-17

Conductivity Study of Cassava Starch Coated Anodę for Zinc-Air Fuel

Celi System

W.M.I.W. ISMAIL¹, L.J. CHIEN¹, H.K. ADLI¹, H. SALLEH², M.N. MASRI¹³’

'Faculty of Bioengineering and Technology, Universiti Malaysia Kelantan, 17600 Jęli, Kelantan,

Malaysia

²Advanced Materials Research Group, Department of Physical Sciences, Faculty of Science and Technology, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Malaysia

^[e-mail]

Keywords: Cassava; Zinc anodę; Zinc-airfuel celi; Conductivity

Abstract. In this study, cassava starch (CS) was preparcd as conductive biodegradable materiał on zinc anodę (ZnC) in zinc-air fucl ccii (ZAFC) by using clcctrochcmistry method. Succcssful formation of cassava on Zn anodc was tested its conductivity by using four-point probc instrument and provcn the cnhanccmcnt of conductivity ofanodc after the deposition of CS. The optimization of conductivity study was further carricd out in different conccntrations of cassava. From conductivity analysis, it was shown the inerement 30% of conductivity values from original conductivity of pure zinc. Moreover, scanning electron microscopy (SEM) and Fourier transform infrared spcctroscopy (FT1R) also wcrc conductcd to evaluate the morphology and Chemical chain of cassava.

Introduction

The world is facing scrious depletion of fossil fucls due to uncontrolled usage of thcsc resourccs [lj. The worldwide cncrgy demand is growing and remaining cncrgy sourccs unable to fulfil the market demand for long run [2J. Fossil fuel is limited natural resource as it takes hundreds or thousands years to restorc yet it also brings somc ncgativc impacts to the cnvironmcnt [3J.

Exploring alternativc cncrgy is one of the cffcctivc ways to support the global cncrgy dcmands [4J. The current rcscarchcrs keeps overlooking in cxploring natural unlimitcd resourccs such as solar cncrgy, hydropower and wind, but thcsc natural resourccs yet arc unstablc and difficult to control [5j. Rcccntly, the fucl ccii tcchnology has rcccntly attractcd massive attention as an altcrnativc cncrgy sourccs to rcplacc traditional fossil fucls [6].

Fucl cclls arc clcctrochcmical dcvicc that comcrt Chemical cncrgy to clcctrical cncrgy and hcat. Bcsidcs, fucl ccii is continuously operating batteries, which can generate clcctricity from fucl, such as hydrogen, and oxidant, such as air. Howcvcr, cvcn the fucl cclls runs likc batteries, in principlc of fucl ccii, it cannot run down or rcquirc rceharging likc battery as long as fucl and oxidant arc supplied [7-l l], Fucl ccii componcnt dividcd into thrcc parts; anodc, cathodc and clcctrolytc. Thcsc thrcc parts play an important role in order to givc smooth rcaction of clcctrochcmical in the system.

Therc arc many typcs of fucl ccii as shown in Tablc l; polymcr cxchange membranę (PEMFC) [12-13 J, solid oxidc (SOFC) [14-15J, zinc-air (ZAFC) [16-17J and morc. Each of fucl ccii havc their different rcaction, operating temperaturę and the usc of clcctrolytc. Howevcr, this study will be focuscd on the ZAFC which arc havc uniquc charactcristic whcrc it Iow cost [18J, high spccific cncrgy and power dcnsity[ 19], casy storage [20] and safc handling [21 ].

Howcvcr, in ZAFC system it only has two main parts; Zn-Air fucl ccii and auxiliary modular. The first part is whcrc the fucl ccii will convcrt the chcmical cncrgy to clcctrical cncrgy. Whilc, sccond part is acts to maintain the temperaturę, electrolyte and fucl supply [23]. In order to kccp ZAFC’s running in the system, continuoas atmospherie oxygcn is nccdcd and thus making it low-cost in fabrication and ablc to crcatc a great deal of spccific cncrgy.

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