Carbon-Supported Trimetallic Catalysts (PdAuNi/C) for Borohydride Oxidation Reaction.
The synthesis of palladium-based trimetallic catalysts via a facile and scalable synthesis procedure was shown to yield highly promising materials for borohydride-based fuel cells, which are attractive for use in compact environments. This, thereby, provides a route to more environmentally friendly energy storage and generation systems. Carbon-supported trimetallic catalysts were herein prepared by three different routes: using a NaBH4-ethylene glycol complex (PdAuNi/CSBEG), a NaBH4-2-propanol complex (PdAuNi/CSBIPA), and a three-step route (PdAuNi/C3-step). Notably, PdAuNi/CSBIPA yielded highly dispersed trimetallic alloy particles, as determined by XRD, EDX, ICP-OES, XPS, and TEM. The activity of the catalysts for borohydride oxidation reaction was assessed by cyclic voltammetry and RDE-based procedures, with results referenced to a Pd/C catalyst. A number of exchanged electrons close to eight was obtained for PdAuNi/C3-step and PdAuNi/CSBIPA (7.4 and 7.1, respectively), while the others, PdAuNi/CSBEG and Pd/CSBIPA, presented lower values, 2.8 and 1.2, respectively. A direct borohydride-peroxide fuel cell employing PdAuNi/CSBIPA catalyst in the anode attained a power density of 47.5 mW cm-2 at room temperature, while the elevation of temperature to 75 °C led to an approximately four-fold increase in power density to 175 mW cm-2. Trimetallic catalysts prepared via this synthesis route have significant potential for future development.
['ElSheikh|Ahmed M A|AMA|0000-0002-7062-9117', 'Backović|Gordana|G|0000-0003-4259-7477', 'Oliveira|Raisa C P|RCP|0000-0002-8060-0668', 'Sequeira|César A C|CAC|0000-0001-7556-2858', 'McGregor|James|J|0000-0001-6813-306X', 'Šljukić|Biljana|B|', 'Santos|Diogo M F|DMF|0000-0002-7920-2638']
trimetallic catalysts borohydride oxidation direct borohydride peroxide fuel cell kinetic parameters nanoparticle palladium