Reversible Multiple Cation Storage in High‐Entropy MXenes for Durable Seawater Batteries
Abstract
ABSTRACT Rechargeable seawater batteries (SWBs) offer compelling advantages for sustainable energy storage, owing to the natural abundance and intrinsic safety of seawater electrolytes. However, the presence of multiple cations in seawater poses challenges for the reversibility and stability of conventional storage materials. Herein, a high‐entropy strategy is introduced to unlock the electrochemical activity of MXenes toward multiple cations in seawater. Mechanistic studies reveal that the unique “cocktail effect” of high‐entropy MXene accelerates ion transport kinetics and stabilizes the layered structure, enabling reversible storage of monovalent (Na + , K + ) and divalent (Mg 2+ , Ca 2+ ) ions with zero‐strain characteristic. As a proof‐of‐concept, a novel SWB is constructed based on an MXene anode with multiple‐cation storage capability and a polytriphenylamine cathode with Cl − storage chemistry. This SWB achieves a high specific capacity of 155 mAh g −1 , excellent rate capability at 15 A g −1 , and impressive cycling durability over 11000 cycles at 25°C. Furthermore, this SWB functions even at −30°C, broadening the application field of seawater‐based energy devices. Overall, this study provides fundamental insights into the cocktail effect in high‐entropy materials and offers a new strategy for designing advanced electrodes for high‐performance SWBs.
Article Details
Authors (12)
Yanzeng Ge
Shuyan Lei
State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation Hainan Provincial Key Lab of Fine Chem Hainan University Haikou China
Baoquan Liu
Petroleum and Chemical Industry Key Laboratory of Organic Electrochemical Synthesis, State Key Laboratory of Green Chemical Synthesis and Conversion, College of Chemical Engineering, Zhejiang University of Technology,
Yubo Yang
Haizhen Jiang
State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation Hainan Provincial Key Lab of Fine Chem Hainan University Haikou China
Si Tang
State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation Hainan Provincial Key Lab of Fine Chem Hainan University Haikou China
Daoxiong Wu
Tianyu Qiu
Jing Li
Hui Zhang
The Fourth Hospital of Hebei Medical University Shijiazhuang China
Jinlin Yang
Department of Chemistry, National University of Singapore, 12 Science Drive 2, Singapore 117549, Singapore
Xinlong Tian
School of Marine Technology and Equipment, State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation, School of Chemistry and Chemical Engineering