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Main Title: Is direct seawater splitting economically meaningful?
Author(s): Hausmann, J. Niklas
Schlögl, Robert
Menezes, Prashanth W.
Drieß, Matthias
Type: Article
Abstract: Electrocatalytic water splitting is the key process for the formation of green fuels for energy transport and storage in a sustainable energy economy. Besides electricity, it requires water, an aspect that seldomly has been considered until recently. As freshwater is a limited resource (<1% of earth's water), lately, plentiful reports were published on direct seawater (around 96.5% of earth's water) splitting without or with additives (buffers or bases). Alternatively, the seawater can be split in two steps, where it is first purified by reverse osmosis and then split in a conventional water electrolyser. This quantitative analysis discusses the challenges of the direct usage of non-purified seawater. Further, herein, we compare the energy requirements and costs of seawater purification with those of conventional water splitting. We find that direct seawater splitting has substantial drawbacks compared to conventional water splitting and bears almost no advantage. In short, it is less promising than the two-step scenario, as the capital and operating costs of water purification are insignificant compared to those of electrolysis of pure water.
Subject(s): desalination
hydrogen production
energy consumption
water electrolysis
technoeconomic analysis
Issue Date: 2021
Date Available: 30-Dec-2021
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: DFG, 390540038, EXC 2008: Unifying Systems in Catalysis "UniSysCat"
TU Berlin, Open-Access-Mittel – 2021
Journal Title: Energy and Environmental Science
Publisher: Royal Society of Chemistry (RSC)
Volume: 14
Issue: 7
Publisher DOI: 10.1039/d0ee03659e
Page Start: 3679
Page End: 3685
EISSN: 1754-5706
ISSN: 1754-5692
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie » FG Metallorganische Chemie und Anorganische Materialien
Verbundforschung » Exzellenzcluster (EXC) » UniSysCat
Appears in Collections:Technische Universität Berlin » Publications

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