Seawater Electrolysis for Hydrogen Production

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Seawater Electrolysis for Hydrogen Production ( seawater-electrolysis-hydrogen-production )

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(a) Energy 9.1% 0.1% 90.9% Stack energy requirement BOP energy requirement SWRO energy requirement (b) 15.4% 6.8% (d) 11.2% Direct capital costs 10.4% 3% (c) Operating costs 3.1% 1.7% 0.2% 95% Electrolyser electricity costs Electrolyser O&M Electrolyser stack replacement SWRO operating costs Cost of H2 8.6% 0.6% SWRO water cost PEM electricity costs PEM capital costs PEM O&M + stack replacement costs+staff Electrolyzer stack cost Electrolyzer mechanical BoP Electrolyzer electrical BoP Electrolyzer installation cost SWRO capital costs including installation 64.4% Figure 5. Breakdown of the (a) daily energy requirement, (b) total capex, (c) operating costs and (d) levelized cost of H2 for a SWRO-PEM electrolysis plant operating at 50 tons H2/day capacity. We further analyzed the carbon footprint of a SWRO facility coupled with PEM electrolysis for H2 production. We ignored any emissions associated with construction and decommissioning as these contributions are minimal when compared to the operating phase of the plant.42 We first calculated the CO2 emissions to produce a kilogram of H2 from the SWRO-PEM electrolysis process using the average emission intensities of various energy sources, as shown in Figure 6(a).43 One obvious observation is that H2 produced via water electrolysis with purely fossil fuel (coal, oil, natural gas) based electricity would end up producing more CO2 than that of present- day SMR process (8-12 kg of CO2/kg H2).44 Secondly and more importantly the contribution of 79.6% 10

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