https://www.cell.com/joule/abstract/S2542-4351(24)00341-6
"The transportation sector was responsible for approximately 22% of global and
37% of US CO₂ emissions from fossil fuel combustion in 2022. Hydrogen produced
by the electrolysis of water using renewable electricity can help decarbonize
transportation, both directly in a fuel cell or engine and indirectly as a
synthetic fuel (e-fuel). We assess the energy efficiency and intensity of
hydrogen pathways characterized by 25 Sankey diagrams for ground, air, and
marine transportation. Using renewable electricity as the primary source for
all energy inputs, we compute current (2019) and future (2035) efficiencies and
compare the results with battery-electric options.
The results show that electric-powered transport is currently approximately 3–8
times more energy efficient than hydrogen alternatives. Powering all US
transportation with green hydrogen would require 10 times more renewable
electricity than is currently produced, and 3–4 times more than is projected in
2035. Renewable electricity is needed to decarbonize the grid and other
sectors; thus, green hydrogen pathways for transportation must be carefully
prioritized. Limited renewable electricity should not be used for hydrogen
production for modes with effective battery-electric alternatives (e.g.,
light-duty vehicles, which account for about 2/3 of US transportation energy
consumption and greenhouse gas emissions). Green hydrogen could be used
strategically in some heavy-duty road, rail, aviation, and marine
applications."
Via
Fix the News:
https://fixthenews.com/living-beings/
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics
