Issue 11, 2023

Direct ocean capture: the emergence of electrochemical processes for oceanic carbon removal

Abstract

The urgent need for effective climate change mitigation has spurred the exploration of various negative emission technologies (NETs). Here, we investigate recent advancements and challenges in electrochemical direct ocean capture (eDOC) of carbon dioxide (CO2), a promising NET for oceanic carbon removal. We analyze different eDOC strategies, focusing on pH swing as the primary mechanism for ocean dissolved inorganic carbon removal, and examine techno-economic challenges, such as achieving industrially preferred current densities and reducing overall costs. Early designs have relied on bipolar membrane electrodialysis, while recent developments have eliminated the need for membranes entirely. We compare different approaches, highlighting the limitations of current eDOC systems. Our study provides insights into the optimization of eDOC systems, suggesting further research is needed to improve system efficiency and address design bottlenecks for large-scale deployment. Ultimately, these advancements will play a crucial role in realizing the full potential of eDOC as an economically viable and environmentally sustainable NET for mitigating climate change.

Graphical abstract: Direct ocean capture: the emergence of electrochemical processes for oceanic carbon removal

Supplementary files

Article information

Article type
Perspective
Submitted
10 May 2023
Accepted
18 Aug 2023
First published
21 Aug 2023

Energy Environ. Sci., 2023,16, 4944-4967

Author version available

Direct ocean capture: the emergence of electrochemical processes for oceanic carbon removal

P. Aleta, A. Refaie, M. Afshari, A. Hassan and M. Rahimi, Energy Environ. Sci., 2023, 16, 4944 DOI: 10.1039/D3EE01471A

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