%0 Journal Article
%A Roger Sathre
%A Corinne D Scown
%A William R Morrow III
%A John C Stevens
%A Ian D Sharp
%A Joel W Ager
%A Karl Walczak
%A Frances A Houle
%A Jeffery B Greenblatt
%B Energy Environ. Sci.
%D 2014
%N 10
%P 3264 - 3278
%R 10.1039/C4EE01019A
%T Life-cycle net energy assessment of large-scale hydrogen production via photoelectrochemical water splitting
%V 7
%8 06/2014
%! Energy Environ. Sci.
%X <p>Here we report a prospective life-cycle net energy assessment of a hypothetical large-scale photoelectrochemical (PEC) hydrogen production facility with energy output equivalent to 1 GW continuous annual average (1 GW HHV = 610 metric tons of H<small><sub>2</sub></small> per day). We determine essential mass and energy flows based on fundamental principles, and use heuristic methods to conduct a preliminary engineering design of the facility. We then develop and apply a parametric model describing system-wide energy flows associated with the production, utilization, and decommissioning of the facility. Based on these flows, we calculate and interpret life-cycle net energy metrics for the facility. We find that under base-case conditions the energy payback time is 8.1 years, the energy return on energy invested (EROEI) is 1.7, and the life-cycle primary energy balance over the 40 years projected service life of the facility is +500 PJ. The most important model parameters affecting the net energy metrics are the solar-to-hydrogen (STH) conversion efficiency and the life span of the PEC cells; parameters associated with the balance of systems (BOS), including construction and operation of the liquid and gas handling infrastructure, play a much smaller role.</p>