“Nanotubos de carbono de pared simple empleados como aglomerante en electrodos de hidruros metálicos

P.S. FERNÁNDEZ; A.N. FILIPPÍN; S. G. REAL; E. B. CASTRO; A, VISINTIN; M. MARTINS

San Juan

Congreso; Tercer Congreso Nacional – Segundo Congreso Iberoamericano Hidrógeno y Fuentes Sustentables de Energía – HYFUSEN 2009; 2009

IES Hyfusen

The electrochemical generation and the storage of hydrogen employing metal hydrides has become a good alternative attending the requirement to search for new sources of clean energy. This work is devoted to study the hydrogen storage as hydrides in an AB5-type metal alloy (MmNi4.1Co0.4Mn0.4Al0.5). The alloy containing electrode behaviour was evaluated employing several electrodes containing the alloy and diverse carbons. Carbons were prepared by using Single Walled Carbon Nanotubes (SWCNT) with different PTFE percentages (15%, 25% y 33%) and Carbon Vulcan XC72® with 33% of PTFE (VT). Several electrochemical techniques as Cyclic Voltammetry (CV), Charge-Discharge cycles and Electrochemical Impedance Spectroscopy (EIS) were used. Results demonstrate that at low discharge currents electrodes containing SWCNT exhibit better hydrogen storage than Vulcan XC72® containing electrodes. Studies made with carbon supports only show that this little but not disregarded differences are related to different hydrogen sorption behaviour of SWCNT and Vulcan XC72®. From the kinetic point of view, Vulcan XC72® containing electrodes have a better behaviour than those made with SWCNT. On the other hand, the optimal percentage of PTFE for SWCNT was determined to be 25%.