2D Superlattices for Efficient Energy Storage and Conversion

Abstract

2D genuine unilamellar nanosheets, that are, the elementary building blocks of their layered parent crystals, have gained increasing attention, owing to their unique physical and chemical properties, and 2D features. In parallel with the great efforts to isolate these atomic‐thin crystals, a unique strategy to integrate them into 2D vertically stacked heterostuctures has enabled many functional applications. In particular, such 2D heterostructures have recently exhibited numerous exciting electrochemical performances for energy storage and conversion, especially the molecular‐scale heteroassembled superlattices using diverse 2D unilamellar nanosheets as building blocks. Herein, the research progress in scalable synthesis of 2D superlattices with an emphasis on a facile solution‐phase flocculation method is summarized. A particular focus is brought to the advantages of these 2D superlattices in applications of supercapacitors, rechargeable batteries, and water‐splitting catalysis. The challenges and perspectives on this promising field are also outlined.

Enhanced Rate Capability of Ion‐Accessible Ti3C2Tx‐NbN Hybrid Electrodes

“…[ 1–6 ] Because of high power density, long cycle life, and superior rate capability, supercapacitors (SCs) have attracted increased attention. [ 7–12 ] SCs can provide power density in excess of 10 kW kg −1 since charges are stored through highly reversible ion adsorption or fast redox reactions (in the case of pseudocapacitors), which is at least ten times higher than commercially available lithium‐ion batteries. [ 13–16 ] This meets the requirements of the applications where high‐rate charge/discharge is demanded, which include but are not limited to energy harvesting/recapturing and delivery in electric vehicles, elevators, trains, smart grids, and backup power for electronics, electric utilities, and factories.…”

Strain engineering of two-dimensional multilayered heterostructures for beyond-lithium-based rechargeable batteries

“…Two-dimensional (2D) molecular nanosheets produced from exfoliation of their layered precursors have been well recognized in electrochemical energy storage. Through the recently developed exfoliation and assembly strategy, vertical assembly of different nanosheets on top of each other generates 2D multilayered heterostructures as promising layered materials for energy storage [15][16][17][18] . Several typical examples have been demonstrated recently for Li and Na storage, including phosphorene/graphene, MnO 2 /graphene, Ti 0.87 O 2 /N-doped graphene and MoS 2 /graphene [19][20][21][22] .…”

Interlayer Doping in Layered Vanadium Oxides for Low‐cost Energy Storage: Sodium‐ion Batteries and Aqueous Zinc‐ion Batteries

“…Two dimensional “superlattices” are composed of two‐dimensional unilamellar nanosheets arranged alternately at the molecular scale [67] . When different two‐dimensional crystals are combined in a vertical stack, many different properties emerged, such as the charge redistribution between adjacent (or even farther) crystals in the stack.…”