Speaker
Description
Current environmental issues such as global warming and climate change are largely
originated by our traditional energy sources. Around 80% of global energy still provided by
fossil fuels and by product of fossil fuels leads to temperature rising of earth. So, humanity
needs some advance energy sources like hydrogen energy which solve the problem of global
warming. Unlike fossil fuels, the only by product of hydrogen energy is water which makes a
clean solution to global warming and reduces the dependency on fossil fuels. Hydrogen offers
a much higher energy density approx. 120MJ/Kg compared to conventional energy source,
which reduces the dependency on fossil fuels. The commercial use of hydrogen energy
depends on several factors such as, hydrogen generation, hydrogen storage and hydrogen fuel
cells which decide that hydrogen energy is efficient and safe for society or not. Among these,
hydrogen storage is one of the most important factors because it directly affects the
transportation of hydrogen gas and its use in vehicle for power. Hydrogen storage is possible
in all phases of hydrogen gas but solid hydrogen storage is more safe and cheap for society
because gaseous form of hydrogen storage needs storage tank of advance material to bear
high pressure (691 atm), which makes it very expensive. Liquid hydrogen storage requires
very high pressure and extremely low temperature conditions that are very difficult to
maintain on a large scale.
Over time extensive research has been conducted for solid hydrogen storage including
metal hydrides, carbon based materials, and chemical hydrides etc. However, since the
discovery of high entropy alloy (HEA) in 2004 by Brian Cantors much of research focus is
shifted towards HEA based hydrogen storage materials. HEAs exhibit unique properties such
as high entropy effect, sluggish diffusion effect, lattice distortion effect, and cocktail effect.
These properties enhance mechanical strength, stabilization of material at high temperature,
improve hydrogen storage and optimize alloy performance, making HEAs highly promising
candidates of hydrogen storage applications.