Transition Metal Selenides for Supercapacitors

Abstract

The advancements in high‐performance flexible energy storage devices are crucial to realize the integration and multifunctionality of wearable devices. Transition metal selenides (TMSes), possess high theoretical capacity and electrical conductivity, which hold great promise for energy storage applications. This review provides a succinct summary of the progress of TMSes as high‐performance electrode materials for supercapacitor applications. First, the energy storage mechanism of TMSes and the effective strategies for achieving high‐performance TMSes are discussed. Subsequently, the recent process of TMSes‐based supercapacitors and other multifunctional applications is summarized. This paper aims to provide the superiority of TMSes as electrode materials and their recent advances for energy devices, to promote the development of high‐performance TMSes electrode materials in the fields of energy storage.

Synergistic Engineering of Carbon Nanotubes Threaded NiSe2/Co3Se4 Quantum Dots with Rich Se Vacancies for High‐Rate Nickel–Zinc Batteries

“…By virtue of high theoretical capacity and intrinsic metallic property, transition metal selenides (TMSe) have been extensively investigated in the field of energy storage, such as Na-ion batteries, Ni─Zn batteries and supercapacitors. [9][10][11] Compared with the transition metal oxides, sulfide and hydroxides, TMSe present more favorable reactivity because of the higher electrical conductivity and better reversibility of metal─Se bonds. [12,13] Nevertheless, the sluggish kinetics coupled with the significant volume expansion during electrochemical reaction process lead to unsatisfied capacity and rapid capacity decay.…”

The role of Mn in widening the potential window of solid solution derived electrodes for aqueous supercapacitors

“…According to E = 0.5 CU 2 , the specific capacitance ( C ) and the operating voltage ( U ) are two key parameters to determine the energy density ( E ). 10,11 To date, many strategies are centered on complicated structure and composition electrode design to enhance the specific capacitance, which limits their scale up. 12–14 The design of asymmetric supercapacitors (ASCs) is the primary approach to broaden the operating voltage, which are typically assembled with low capacity carbon materials and require additional capacity matching.…”

Stepwise Construction of MoS2@CoAl-LDH/NF 3D Core–Shell Nanoarrays with High Hole Mobility for High-Performance Asymmetric Supercapacitors

“…Today, due to the constant updating and development of portable devices and electric vehicles, a new generation of energy storage systems is required with the key characteristics of high performance, light weight, and flexibility. − Supercapacitors (SCs) are exceptionally promising candidates for applications in flexible electronics and renewable energy systems. Their alluring attributes include a high power density, swift charging and discharging capabilities, an exceptionally long lifespan, cost-effective fabrication, and an environmentally benign nature. − Nevertheless, the comparatively modest energy density of SCs remains a significant impediment to their broader adoption. − When considering the formula for energy density, E = 1/2 CV 2 , it becomes evident that enhancing energy density hinges critically on augmenting the specific capacitance ( C ) and broadening the voltage window ( V ).…”