In Situ Generation of Ultrathin MoS₂ Nanosheets in Carbon Matrix for High Energy Density Photo‐Responsive Supercapacitors

Abstract

Stimuli‐responsive supercapacitors have attracted broad interest in constructing self‐powered smart devices. However, due to the demand for high cyclic stability, supercapacitors usually utilize stable or inert electrode materials, which are difficult to exhibit dynamic or stimuli‐responsive behavior. Herein, this issue is addressed by designing a MoS2@carbon core‐shell structure with ultrathin MoS2 nanosheets incorporated in the carbon matrix. In the three‐electrode system, MoS2@carbon delivers a specific capacitance of 1302 F g−1 at a current density of 1.0 A g−1 and shows a 90% capacitance retention after 10 000 charging‐discharging cycles. The MoS2@carbon‐based asymmetric supercapacitor displays an energy density of 75.1 Wh kg−1 at the power density of 900 W kg−1. Because the photo‐generated electrons can efficiently migrate from MoS2 nanosheets to the carbon matrix, the assembled photo‐responsive supercapacitor can answer the stimulation of ultraviolet‐visible‐near infrared illumination by increasing the capacitance. Particularly, under the stimulation of UV light (365 nm, 0.08 W cm−2), the device exhibits a ≈4.50% (≈13.9 F g−1) increase in capacitance after each charging‐discharging cycle. The study provides a guideline for designing multi‐functional supercapacitors that serve as both the energy supplier and the photo‐detector.

Nanoengineered Carbon‐Based Interfaces for Advanced Energy and Photonics Applications: A Recent Progress and Innovations

“…Reproduced under the terms of the CC-BY license. [166] Copyright 2022, The Authors, published by Wiley-VCH. channels, have been developed.…”

“…Tang et al addressed this problem by working out a novel design of a MoS 2 @carbon core–shell structure, having ultrathin MoS 2 nanosheets combined with a carbon matrix ( Figure a). [ 166 ] In the case of a three‐electrode system, such a composition is able to provide a specific capacitance of ≈1302 F g −1 at a current densities near 1.0 A g −1 , showing a 90% consistent capacitance after ≈10 000 cycles. At the power density of 900 W kg −1 , the MoS 2 @carbon‐based asymmetric supercapacitor displays an energy density of ≈75.1 Wh kg −1 .…”

“…e) CV curves for symmetric supercapacitors in various potentials. Reproduced under the terms of the CC-BY license [166]. Copyright 2022, The Authors, published by Wiley-VCH.…”

Recent progress in the development of smart supercapacitors

“…Therefore, it is very important to summarize related works on intelligent supercapacitors. Although researchers have conducted considerable research works on smart supercapacitors, there is still little literature summary on the related works of different smart supercapacitors 51–53 …”

“…Although researchers have conducted considerable research works on smart supercapacitors, there is still little literature summary on the related works of different smart supercapacitors. [51][52][53] This review comprehensively summarizes, deeply discusses, and prospects the relevant progress, existing problems, and future development trends of research works on smart supercapacitors in recent years, such as electrochromism, self-healing, shape memory, self-charging, electromagnetic shielding, and sensing (Figure 1). The purpose of this review is to provide a convenient and fast reference for researchers in related fields to promote the rapid and healthy development of the whole field and the intelligence era.…”