MoS2 Passivated Multilayer Graphene Membranes for Li‐Ion Extraction From Seawater
Abstract
Abundant Li resources in the ocean are promising alternatives to refining ore, whose supplies are limited by the total amount and geopolitical imbalance of reserves in Earth's crust. Despite advances in Li+ extraction using porous membranes, they require screening other cations on a large scale due to the lack in precise control of pore size and inborn defects. Herein, MoS2 nanoflakes on a multilayer graphene membrane (MFs‐on‐MGM) that possess ion channels comprising i) van der Waals interlayer gaps for optimal Li+ extraction and ii) negatively charged vertical inlets for cation attraction, are reported. Ion transport measurements across the membrane reveal ≈6‐ and 13‐fold higher selectivity for Li+ compared to Na+ and Mg2+, respectively. Furthermore, continuous, stable Li+ extraction from seawater is demonstrated by integrating the membrane into a H2 and Cl2 evolution system, enabling more than 104‐fold decrease in the Na+ concentration and near‐complete elimination of other cations.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 15, 2023
- Source ID
- 10.1002/smll.202207020
Entities
People
- Beomju Kim
- Dae Yeop Jeong
- Jin Myung Kim
- Minjoo Kim
- Suhee Jang
- SungWoo Nam
- Won Il Park
- Won Jun Chang
- Yelim Kim
Organizations
- Air Force Office of Scientific Research
- Hanyang University
- National Science Foundation
- University of California, Irvine
- University of Illinois Urbana–Champaign