Synergistically coupling of ternary hydrotalcite and Ti3C2Tx-MXene nanosheets boosting electronic transmission in energy storage

Abstract

Layered double hydroxides (LDH) and two-dimensional metal carbides (Ti3C2Tx) garner significant attention in recent years. LDH/Ti3C2Tx nanohybrids combine the unique characteristics of individual component, making them a promising option for high-power energy storage applications. Here, we present a composite electrode constructed by synergistic coupling of Ti3C2Tx and ternary hydrotalcite (NiCoMn-LDH). Strong interfacial interactions between the NiCoMn-LDH array and Ti3C2Tx nanoflakes, along with effective electron coupling, contribute to enhanced structural stability, conductivity, and electrolyte accessibility, thereby significantly promoting the kinetics of redox reactions. The intriguing “lace-like” structure fully utilizes the high activity of NiCoMn-LDH and the excellent conductivity of Ti3C2Tx, allowing LDH/Ti3C2Tx to exhibit an impressive output capacitance of 1102.9 F g−1 at 1 A g−1, coupled with notable rate capability (66.87 % at 20 A g−1). The constructed LDH/Ti3C2Tx//AC hybrid supercapacitor (HSC) achieves a remarkable energy density of 47.3 Wh kg−1 at 800 W kg−1. Following 5000 cycles, the specific capacity of HSC decreases by merely 8.3 %, while achieving a Coulombic efficiency of 99 %, showcasing remarkable durability and reversible reaction characteristics. This study provides a streamlined and effective methodology for crafting LDH/Ti3C2Tx nanohybrids, showcasing robust coupled interfaces and exceptional electrochemical energy storage application.