Water-induced strong isotropic MXene-bridged graphene sheets for electrochemical energy storage

• 成果类型: Article
• 署名作者: Yang, Jiao; Li, Mingzhu; Fang, Shaoli; Wang, Yanlei; He, Hongyan; Wang, Chenlu; Zhang, Zejun; Yuan, Bicheng; Jiang, Lei; Baughman, Ray H.; Cheng, Qunfeng
• 署名单位: Beihang University; Chinese Academy of Sciences; Technical Institute of Physics & Chemistry, CAS; University of Texas System; University of Texas Dallas; Chinese Academy of Sciences; Institute of Process Engineering, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; University of Science & Technology of China, CAS; University of Shanghai for Science & Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11456
• DOI: 10.1126/science.adj3549
• 发表日期: 2024-02-16
• 页码: 771-777
• 关键词: volumetric capacitance; scalable synthesis; stress-relaxation; high-strength; films; oxide; DYNAMICS; nanocomposites; intercalation; integration

摘要

Graphene and two-dimensional transition metal carbides and/or nitrides (MXenes) are important materials for making flexible energy storage devices because of their electrical and mechanical properties. It remains a challenge to assemble nanoplatelets of these materials at room temperature into in-plane isotropic, free-standing sheets. Using nanoconfined water-induced basal-plane alignment and covalent and pi-pi interplatelet bridging, we fabricated Ti3C2Tx MXene-bridged graphene sheets at room temperature with isotropic in-plane tensile strength of 1.87 gigapascals and moduli of 98.7 gigapascals. The in-plane room temperature electrical conductivity reached 1423 siemens per centimeter, and volumetric specific capacity reached 828 coulombs per cubic centimeter. This nanoconfined water-induced alignment likely provides an important approach for making other aligned macroscopic assemblies of two-dimensional nanoplatelets.