High-performance capacitive deionization based on novel polyelectrolyte-infused intercalation electr
Abstract
The proposed project aims to develop a high-performance electrochemical desalination system using electrodes based on ion-in,tercalation materials. Specifically, we will develop and systematically investigate capacitive deionization (CDI) based on intercala,tion electrodes and with symmetric configuration (si-CDI, ?s? for symmetric, ?i? for intercalation). The overarching goal is to enab,le CDI for desalinating relatively saline brackish water or even seawater for producing portable water in Expeditionary settings, wh,ich, in this RFP, requires reducing the total dissolved solid (TDS) from up to 35 g/L to below 0.5 g/L and producing water at a flow, rate of 3 gal/hour. The choice of si-CDI is justified by the facts that (1) CDI based on intercalation materials have substantially, higher salt adsorption capacity (SAC) and better long-term stability as compared to conventional carbon electrodes; (2) symmetric c,onfiguration can realize the full potential of CDI based on intercalation electrodes by eradicating the use of carbon electrode. The, major components of this multipronged project include (1) fabricating novel electrodes based on NaaTibFec(PO4)d material with polya,nion infusion to achieve high SAC and low ionic resistance; (2) comparing the proposed electrode material vs. conventional electrode, materials and between the two possible configurations of si-CDI; (3) developing system-scale predictive si-CDI model for design and, optimization of the full-scale si-CDI system; and (4) demonstrating the target desalination using an si-CDI system prototyped based, on model-driven design. Overall, the project aims to deliver an si-CDI system based on polyanion-infused NaaTibFec(PO4)d -based ele,ctrodes capable of achieving the target separation. The success of the project will aid the development of the next-generation, electrochemically based water purification technologies for small-scale, intermittent desalination. It is expected that next-genera,tion electrochemical desalination systems will complement RO to become an important part of the portfolio for water supply to the US, Marine Corps, with electrochemical desalination becoming the technology of choice for Expeditionary environments. The three-year co,llaborative will be pursued by a team with complimentary and strongly pertinent expertise, including the Lin group (Vanderbilt Unive,rsity) with extensive experience in water treatment desalination and the Chen group (UCSD) with strong expertise in electrode materi,al.(Approved for Public Release)
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 13, 2022
- Source ID
- N000142212565
Entities
People
- Shihong Lin
Organizations
- Office of Naval Research
- United States Navy
- Vanderbilt University