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Title: Pulse Electrodeposition for Carbonate-Rich Deposits from Seawater

Journal Article · · Sustainability (Basel)
ORCiD logo [1];  [1];  [2]; ORCiD logo [3];  [4]
  1. University of Washington, Seattle, WA (United States)
  2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  4. University of Washington, Seattle, WA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

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 CaCO3-rich deposits, but constant-voltage electrodeposition results in a mixture of CaCO3 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 CaCO3-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 CaCO3 deposited, the energy required per gram of CaCO3 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.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office
Grant/Contract Number:
AC05-76RL01830; AC36-08GO28308
OSTI ID:
2496252
Report Number(s):
NREL/JA--5700-92604; PNNL-SA--192076; MainId:94385; UUID:6cd58559-7337-45f4-98af-db1aa361c798; MainAdminId:75640
Journal Information:
Sustainability (Basel), Journal Name: Sustainability (Basel) Journal Issue: 23 Vol. 16; ISSN 2071-1050
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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