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

Abstract

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 π-π interplatelet bridging, we fabricated Ti 3 C 2 T x 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.

Fluorinated Fullerenes as Electrolyte Additives for High Ionic Conductivity Lithium-Ion Batteries

“…In the context of the growing prevalence of electrification and the development of renewable energy sources, electrochemical energy storage technology is becoming an increasingly pivotal solution to the challenges associated with energy storage and conversion [1][2][3]. One of the most crucial performance parameters in electrochemical energy storage devices is the optimization and enhancement of ionic conductivity [4], which has emerged as a significant area of research and development [5][6][7].…”

Anion-regulated 2D amorphous binary nickel–iron nitrides for efficient water oxidation at high-current-densities

“…Transition metal nitrides (TMNs), equipped with unique electronic structures, high electrical conductivity, and excellent chemical stability, are potential OER electrocatalysts. 5 In particular, Fe/Ni-based nitrides are promising OER candidates due to their almost metallic properties and high electrical conductivity. 6 The reported strategies to enhance the OER performance of TMNs are usually single-scale structural control, consisting of heteroatom doping, defect induction, heterostructure engineering, or alloying.…”

“…7 Directly forming 2D TMNs requires high temperatures due to the unfavorable thermodynamic process. 5,8 Notably, deep eutectic solvents (DESs), a combination of hydrogen bonding donor and acceptor, exhibit the potential to serve as a universal medium to fabricate 2D non-van der Waals materials. 9,10 This is attributed to the distinctive structure of DESs, which can be intentionally designed to meet the controllable demand of specific materials.…”

Ultrastrong graphene sheets induced by nanoconfined water

“…In a recent pioneering study published in Science [ 5 ], Prof. Qunfeng Cheng's group at Beihang University found that interlayer nanoconfined water in transition-metal carbides and/or nitrides (MXenes) and graphene oxide (GO) nanoplatelets, can strongly improve their alignment. In this work, MXene and GO nanoplatelets with similar lateral sizes were stirred in water at room temperature to form MXene-bridged GO (MGO) nanoplatelets.…”

“…In sum, Cheng and co-workers [ 5 ] provide an important first demonstration of how nanoconfined water may be exploited in assembling high-performance nanocomposites. The resulting greatly-enhanced mechanical properties of the composites hold strong potential for improved energy-storage devices, among others.…”