Title: Surface area effect of porous silicon in the electrochemical hydrogen storage

Abstract:

In order to increase the capacity of hydrogen storage of the porous silicon and the specific surface area, we prepared different type of porous silicon: nanoporous and mesoporous silicon by using electrochemical anodization. After that, we investigated this layers by: SEM microscopy, SIMS spectrometry, contact angle, cyclic voltamme-try, electrochemical spectroscopy (EIS) and charge / discharge galvanostatic.  The SIMS profiles at depth performed on PS layers before and after thehydrogen sorption show the increase of hydrogen concentration from 3.5x1020 atm / cm3 to6.8x1021 atm / cm3 which confirms the sorption and the storage of H + ions in the anode(PS).  The  measured  discharge  capacity  is  of  the  order  of  477  mAh  /g  with  a  coulompicefficiency of the order of 94% for the nanoporous silicon which confirms that this material iscould be a promising candidate for the storage of hydrogen.