Maharjan, M. and Bhattarai, A. and Ulaganathan, M. and Wai, N. and Oo, M.O. and Wang, J.Y. and Lim, T.M.
(2017)
High surface area bio-waste based carbon as a superior electrode for vanadium redox flow battery.
Journal of Power Sources, 362.
pp. 50-56.
ISSN 0378-7753
Abstract
Activated carbon (AC) with high surface area (1901 m2 g�1) is synthesized from low cost bio-waste orange
(Citrus sinensis) peel for vanadium redox flow battery (VRB). The composition, structure and
electrochemical properties of orange peel derived AC (OP-AC) are characterized by elemental analyzer,
field emission-scanning electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron
spectroscopy, cyclic voltammetry (CV), and electrochemical impedance spectroscopy. CV results show
that OP-AC coated bipolar plate demonstrates improved electro-catalytic activity in both positive and
negative side redox couples than the pristine bipolar plate electrode and this is ascribed to the high
surface area of OP-AC which provides effective electrode area and better contact between the porous
electrode and bipolar plate. Consequently, the performance of VRB in a static cell shows higher energy
efficiency for OP-AC electrode than the pristine electrode at all current densities tested. The results
suggest the OP-AC to be a promising electrode for VRB applications and can be incorporated into making
conducting plastics electrode to lower the VRB cell stack weight and cost.
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