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Sains Malaysiana 43(3)(2014): 459–465
A Hybrid Enzymatic Zinc-Air Fuel Cell (Sel Bahan Api Hibrid Berenzim Zink-Udara)
ABDUL AZIZ AHMAD, RAIHAN OTHMAN*, FARIDAH YUSOF
& MOHD FIRDAUS
ABD WAHAB
Faculty of Engineering, International Islamic University Malaysia
P.O. Box 10, 50728 Kuala Lumpur, Malaysia
Received: 30 October 2012/Accepted: 13 June 2013
ABSTRACT
A hybrid biofuel cell, a zinc-air cell employing laccase as the oxygen
reduction catalyst is investigated. A simple cell design is employed;
a membraneless single chamber and a freely suspended laccase in
the buffer electrolyte. The cell is characterised based on its open-circuit
voltage, power density profile and galvanostatic discharge at 0.5
mA. The activity of laccase as an oxidoreductase is substantiated
from the cell discharge profiles. The use of air electrode in the
cell design enhanced the energy output by 14%. The zinc-air biofuel
cell registered an open-circuit voltage of 1.2 V and is capable
to deliver a maximum power density of 1.1 mWcm-2 at
0.4 V. Despite its simple design features, the power output is comparable
to that of biocatalytic cell utilising a much more complex system
design.
Keywords: Biocatalyst; bioelectrochemical cell; enzymatic zinc-air
cell; hybrid biofuel cell; laccase; metal biofuel cell
ABSTRAK
Sel bio-bahan api hibrid, sel zink-udara menggunakan lakase
sebagai pemangkin bagi penguraian oksigen dikaji. Reka bentuk sel yang mudah
diguna pakai: Ruangan tunggal tanpa membran dan lakase yang diampaikan secara
bebas di dalam elektrolit pemampan. Pencirian sel adalah berdasarkan voltan
litar terbuka, profil ketumpatan kuasa dan discas pada arus malar 0.5 mA.
Aktiviti lakase sebagai enzim penguraian oksigen dibuktikan daripada profil
discas sel. Penggunaan elektrod udara di dalam reka bentuk sel berhasil
menambahkan keluaran tenaga sebanyak 14%. Sel bio-bahan api zink-udara
memberikan voltan litar terbuka 1.2 V dan berupaya menghasilkan ketumpatan
kuasa maksimum 1.1 mWcm-2 pada
0.4 V. Di sebalik ciri reka bentuk sel yang mudah, keluaran kuasa yang
dihasilkan adalah sebanding dengan sel bio-pemangkin yang menggunapakai reka
bentuk sistem yang jauh lebih rumit.
Kata kunci: Bio-pemangkin;
lakase; sel bio-bahan api hibrid; sel bio-bahan api logam; sel bioelektrokimia;
sel zink-udara berenzim
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