Pulse Electrodeposition for Carbonate-Rich Deposits from Seawater

Alexander J. Robinson, Elisabeth A. Ryan, Qingpu Wang, David Greene and Chinmayee V. Subban ()
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Alexander J. Robinson: Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
Elisabeth A. Ryan: Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
Qingpu Wang: Energy and Environment Directorate, Pacific Northwest National Laboratory, Seattle, WA 98109, USA
David Greene: National Renewable Energy Laboratory, Golden, CO 80401, USA
Chinmayee V. Subban: Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA

Sustainability, 2024, vol. 16, issue 23, 1-11

Abstract: Seawater electrodeposition is gaining renewed interest in the context of sustainable development, both to build climate-resilient coastal infrastructure and for ocean-based decarbonization applications. Most of the applications benefit from CaCO 3 -rich deposits, but constant-voltage electrodeposition results in a mixture of CaCO 3 and Mg(OH) 2 , especially at higher voltages where precipitation rates are more desirable. The use of pulse voltages can help control interfacial pH that dictates the precipitation reactions. Here, we explore the use of pulse electrodeposition as a function of pulse frequency and duty cycle to control deposit composition. The most CaCO 3 -rich deposits were obtained under 10 Hz frequency and 10% duty cycle conditions for the voltage window investigated (−0.8 V to −1.2 V vs. SCE). While pulsing the voltage increases the amount of CaCO 3 deposited, the energy required per gram of CaCO 3 is significantly higher (14.5×) when compared to the base case of applying a constant voltage of −0.8 V vs. SCE. Further optimization of pulse conditions, electrode materials, and system configuration could lead to finding parameters that result in exclusively carbonate deposits without compromising precipitation rates, which may prove to be more useful for corrosion protection, coastal infrastructure, and other applications in sustainable development.

Keywords: carbon mineralization; calcareous deposits; electrodeposition; voltage pulsing; seawater (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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