Abstract
Aero-eutectic graphite can be defined as a new light material with hierarchically structured porosity. It is obtained from the solidification of gray cast irons, followed by the dissolution of the ferrous matrix by an acidic sequence. The result is a continuous and interconnected network of graphite sheets with varied dimensions randomly oriented. X-ray diffraction characterization has revealed graphite crystallographic planes (002), (100), (101), (102) and (004), while the surface area measured by BET and Langmuir methods has been determined in the order of 90 m2 g−1 and 336 m2 g−1, respectively. The process of obtaining eutectic aero-graphite also allows the deposit of Cu nanofilms and TiC particles. Aero-eutectic graphite has been tested as cathode in Li–O2 batteries as it has been prepared, without the addition of binders or conductive carbons, showing an appropriate contact with the electrolyte, so that the oxygen reduction and evolution reactions may develop satisfactorily. In the discharge-charge galvanostatic tests, the battery accomplishes 20 complete cycles with area capacity limited to 1.2 mAh cm−2.
Highlights
The limited reserves of fossil fuels and the adverse effects that they may generate on the environment have led to the development of renewable energies, among which solar and wind power stand out
A side effect of the use of fossil fuels such as coal and oil is the emanation of CO2, which has contributed significantly to global warming during the last century due to the greenhouse effect it generates [1,2,3].The separation of CO2 requires new porous materials that act as absorbents of this compound to reduce environmental pollution
The cooling rates during solidification of gray cast irons are higher than those corresIpnothnedrienggultaor tphraectFicee,Ctheeqcuooilliibnrgiuramtesddiuarginragmso.liFdoifircathtioisnroefagsroany,csaostliidroinfiscaarteiohnigdheoretshannot occur those corresponding to the Fe-C equilibrium diagram
Summary
The limited reserves of fossil fuels and the adverse effects that they may generate on the environment have led to the development of renewable energies, among which solar and wind power stand out. Surface areas and porosity can be designed during solidification process seeking to optimize shape and size of pores, electrical and thermal conductivities and flow properties This HSPM graphite, hereafter referred to as Aero-Eutectic Graphite (AEG), could be defined as crystalline solid with hierarchical porosity and high surface area, characterized by excellent electrical and thermal conductivities, good flow properties and low chemical reactivity. These features could be advantageous for catalysis processes, solar collectors, supporting electrode for nanofilms of Cu and electrodes for energy storage cells. The present work reports the synthesis and characterization of AEG, and preliminary results of its performance as a Li–O2 battery cathode
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