Electrodeposited molybdenum-doped Co3O4 nanosheet arrays for high-performance and stable hybrid supercapacitors

Abstract

Long-cycle stability and high-energy density are big challenges for developing high-performance hybrid supercapacitor (HSC) electrode materials. In this work, molybdenum-doped Co 3 O 4 nanosheets arrays on nickel foam (noted as Mo x Co 1.5−x O/ NF) are successfully prepared via facile one-step electrodeposition followed by annealing for hybrid supercapacitors. The experimental and calculated results indicate that the band gap modification and conductivity enhancement of Mo x Co 1.5−x O lead to excellent capacitive performance due to the doping of Mo into Co 3 O 4 . The as-prepared Mo 0.25 Co 1.25 /NF electrode demonstrates a high specific capacity of 128.2 mAh g −1 (923 F g −1 ) at 1 A g −1 (60% higher than the undoped Co 3 O 4 ) and superior cycle stability with 95.2% capacity retention after 10,000 cycles at 10 A g −1 . The assembled HSC delivers highenergy density of 64.3 Wh kg −1 at the power density of 794.1 W kg −1 and with 87.7% capacity retention after 10,000 cycles. This work can present a new strategy to fabricate the three-dimensional high-performance integrated electrode materials by a facile electrodeposition for heteroatom-doped transition metal oxide for high-performance supercapacitors.

Self-Supported Co3O4@Mo-Co3O4 Needle-like Nanosheet Heterostructured Architectures of Battery-Type Electrodes for High-Performance Asymmetric Supercapacitors

“…Mo-doping of Co 3 O 4 by various methods (sol-gel, electrodeposition, and hydrothermal) has been investigated as a means to synthesize potential electrode materials [ 10 , 11 ]. Shen et al developed Mo-Co 3 O 4 nanosheets as a battery-type electrode for supercapacitor applications and reported a specific capacity of 128.2 mAh/g at 1 A/g with 95% of capacity retention after long-term cyclings [ 12 ]. The experimental results were substantiated by theoretical calculations; it was shown that Mo-doping of Co 3 O 4 modifies the bandgap and increases the electronic conductivity of the parent material, which enhances charge storage capability.…”

Nanoporous oxide electrodes for energy conversion and storage devices

“…By adjusting the voltage, pulse frequency, space between the components, deposition duration, and the use of nonconductive masks, porosity can be controlled through this technique. Electrodeposition has drawn attention in different applications (e.g., capacitors, [132][133][134] batteries, 135,136 DSSCs, [137][138][139] electrochemistry 133,[140][141][142] ). Fig.…”

“…Electrodeposition has drawn attention in different applications ( e.g. , capacitors, 132–134 batteries, 135,136 DSSCs, 137–139 electrochemistry 133,140–142 ). Fig.…”

Synthesis strategies of smart 3D nanoarchitectures and their applications in energy storage and conversion

“…At a current density of 1 A g −1 , a high specific capacity of 923 F g −1 is displayed by the optimized Mo 0.25 Co 1.25 /NF electrode. A white LED is also lit for 3.5 min by two series of HSCs 25 …”

“…A white LED is also lit for 3.5 min by two series of HSCs. 25 The electrodeposition approach is used to create the 3D ternary composite PPy/rGO/ZrO 2 by electrochemically polymerizing the pyrrole monomer, electrochemically reducing the GO, and creating ZrO 2 nanoparticles. Pyrrole, zirconyl chloride octahydrate, sodium para-toluene sulfonate, and GO are combined in an aqueous dispersion in deionized water.…”