Modifying pristine graphite felt (GF) active electrode, highly active platinum/multiwalled carbon nanotubes (Pt/MWNTs) electrocatalyst,
helps in developing new V(III)/V(V) vanadium redox flow battery (VRFB) and the improving the performance of the
V(II)/V(V) battery. Cyclic voltammetry analyzes demonstrated that Pt/MWNT electrocatalyst has an excellent capacity for enhancing
V3+/VO2+ and VO2+/VO2
+ redox reactions, and both reactions are quasireversible. The V3+/VO2+ redox couple provides the
V(III)/V(V) battery redox reaction. The VO2+/VO2
+ and V3+/VO2+ redox reactions occurred in the pristine GF of the positive
active electrode and in the Pt/MWNT + GF of the negative active electrode, respectively, using the same electrolyte (1 M VO2+
–1 M H2SO4). At the operating current densities of 12 and 20 mA cm−2, the cell coulombic efficiency reached 93.75% and 83.88%,
respectively. A test V(II)/V(V) battery was assembled with the positive active electrode of Pt/MWNT + GF and the negative active
electrode of the GF. The charge–discharge curves showed a slight IR drop in the active electrode, which was likely caused by the
Pt/MWNT electrocatalyst. At an operating current density of 20 mA cm−2, the cell energy efficiency was 11.58% higher than that
without an electrocatalyst. The results show the potential of Pt/MWNT catalysts in VRFB applications
This study investigates the feasibility of adding platinum (Pt)/titanium dioxide (TiO(2)) particles into the anode catalyst layer to improve the performance of proton exchange membrane fuel cells. The effects of adding Pt/TiO(2) in the catalyst layer on three critical factors, namely, the wettability, the electrical resistance, and the loading of Pt/TiO(2) particles, were also evaluated. It was observed that the water contact angles of these catalyst layers were decreased as the weight percentage of Pt/TiO(2) particles increased. Similarly, the electrochemically active surface areas prepared by these catalyst inks were decreased with the increase in Pt/TiO(2) addition. Single cell performance with various amounts of Pt/TiO(2) particles in the anode catalyst layer was investigated under different temperatures of anode humidifier. The cell with 5% Pt/TiO(2) particle addition in the anode catalyst layer revealed the best performance at anode humidifier temperatures ranging from 25 to 75 degrees C. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3428725] All rights reserved
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