Carbon-Supported IrM (M=V, Mn, Fe, Co, and Ni) Binary Alloys as Anode Catalysts for Polymer Electrolyte Fuel Cells

Abstract

Carbon-supported binary IrM (where M=V , Mn, Fe, Co, and Ni as the second active component) alloys as a substitute for platinum were viewed as the anode catalysts in polymer electrolyte membrane fuel cells. The resulting IrCo∕C and IrV∕C of 50:50 ratio, heat-treated at 800°C in argon atmosphere, exhibited promising catalytic performance in terms of the hydrogen oxidation reaction and results in mass activity and specific activity at almost the same level and even a little higher as compared with 20% Pt∕C at 25°C . These carbon-supported catalysts showed particle sizes ranging from 7to16nm . Results of electrochemical characterizations, performed using a rotating disk electrode by cyclic voltammetry, linear sweep voltammetry, and chronoamperometry with emphasis on the activity of the catalyst, are presented in 0.1M HClnormalO4 .

New non-platinum Ir–V–Mo electro-catalyst, catalytic activity and CO tolerance in hydrogen oxidation reaction

“…All potentials in this work were referred to reversible hydrogen electrode (RHE). The measurement was carried out using a rotating disk electrode (RDE) by linear sweep voltammetry (LSV) at a rotation speed of 300 rpm and scan rate of 5 mV s À1 [21].…”

Nanostructured robust cobalt metal alloy based anode electro-catalysts exhibiting remarkably high performance and durability for proton exchange membrane fuel cells

“…Pt/C) possess excellent electrochemical activity and electrochemical stability/durability as PEMFC anode and cathode materials although posing a major economic barrier to large-scale commercialization of PEMFCs. [12][13][14][15][16][17][18] Hence, there has been a widespread intense research activity directed at identifying nonnoble metal or reduced noble metal containing electro-catalysts exhibiting high electrochemical activity and stability/durability that will minimize precious metal loadings to ultra-low levels. To this extent, several approaches have been explored thus far, and there still remains considerable opportunity to not only identify such systems but also develop novel approaches to generate these systems with the required materials and electrochemical attributes.…”

A Platinum Monolayer Core-Shell Catalyst with a Ternary Alloy Nanoparticle Core and Enhanced Stability for the Oxygen Reduction Reaction

“…The atomic radii of Pd, Ir, and Ni atoms are 1.37, 1.36, and 1.25Å, respectively. When more Ni atoms entered into the Pd lattice, it can result in the decrease of the lattice parameter and the Pd-Pd interatomic distance because the radius of the Ni atom was smaller than that of the Pd atom [27]. Clearly, the (111) diffraction peak for the catalysts shifted positively as the Ni content increased, and the lattice parameters decreased obviously with the increase of the content of nickel.…”