Atomic Modulation Triggering Improved Performance of MoO₃ Nanobelts for Fiber‐Shaped Supercapacitors

Abstract

Asymmetric supercapacitors (ASCs) are emerging as a new class of energy storage devices that could potentially meet the increasing power and energy demand for next‐generation portable and flexible electronics. Yet, the energy density of ASC is severely limited by the low capacitance of the anode side, which commonly uses the carbon‐based nanomaterials. Here, the demonstration of sulfur‐doped MoO3−x nanobelts (denoted as S‐MoO3−x) as the anode for high‐performance fiber‐shaped ASC are reported. The Mo sites in MoO3 are intentionally modulated at the atomic level through sulfur doping, where sulfur could be introduced into the MoO6 octahedron to intrinsically tune the covalency character of bonds around Mo sites and thus boost the charge storage kinetics of S‐MoO3−x. Moreover, the oxygen defects are occurring along with sulfur‐doping in MoO3, enabling efficient electron transport. As expected, the fiber‐shaped S‐MoO3−x achieves outstanding capacitance with good rate capability and long cycling life. More impressively, the fiber‐shaped ASC based on S‐MoO3−x anode delivers extremely high volumetric capacitance of 6.19 F cm−3 at 0.5 mA cm−1, which makes it promising as one of the most attractive candidates of anode materials for high‐performance fiber‐shaped ASCs.

Interfacing Silicate Layer Between MoO3 Ribbon and Pt Metaldots Boosts Methanol Oxidation Reaction

“…The ECSA measurement was carried out in 0.5 M H 2 SO 4 by CVs (Fig. 5A) using the following equation ECSA = QH/QH* (4) where QH is the charge collected from the hydrogen adsorption region after double-layer correction and QH* is the standard value of 210 μC.cm −2 associated with adsorption of a hydrogen monolayer at polycrystalline Pt surface [32,33]. The obtained ECSA values are summarized in the Table 1.…”

“…Nevertheless, those sustainable energy sources are subjected to the infrequent time bounded among trade and necessity. As an impact, researchers are focusing towards the technologies which could exhibit exceptionally high energy density, economic, environment-benign and safety such as energy harvesting and storage, metal-air batteries, windmills, hydrogen fuels, solar cells, water electrolysis and fuel cells [2][3][4][5]. Most of those alternative tech-nologies are employing the electrochemical reactions, and efficiency of energy harvesting processes often suffered by the lethargic electron transfer process.…”

“…It is obvious that carbon as a solid support for Pt NPs is of highly attractive due to its high conductivity, high stability, and controllable structure. On the other hand, among the above-mentioned metal oxides, MoO 3 is one of the most important semi conductive oxide has been widely investigated for its superior gas-sensitive and lithium storage properties due to its high chemical stability [2][3][4][5][6]. Therefore, inclusion of MoO 3 in the catalyst design can boost the electronic conductivity of the Pt NPs thereby enhance the catalytic activity.…”

Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

“…[ 3 ] Consequently, SCs are regarded as the front‐runner for next‐generation EES devices with rapid charge–discharge rate due to their ultrahigh power density (typically around 10 kW kg −1 ) and excellent cycling durability. [ 4 ] Nonetheless, the age‐old conundrum of relative low energy density restricts their practical utilization. According to the equation of , the energy density ( E ) of SCs can be improved by increasing either specific capacitance ( C ) or voltage window ( V ).…”

Facile Synthesis Mn2O3 Nanorod Arrays: A Significant Material for Supercapacitor Electrode Application

“…Particularly, different transition metal oxides such as ruthenium-based materials, NiO [9], Co3O4 [10], MoO3 [11], MnO2 [12], V2O5 [13], SnO2 [14], Nb2O5 [15] and TiO2 [16] have been generally demonstrated as supercapacitor electrode materials owing to their low cost, environmental friendliness, high redox activity and easy abundance in nature.…”