Construction of an Ultra‐High‐Energy Density Hybrid Supercapacitor with Self‐Assembled 3D Hydrangea Flower‐like Mo‐rich CoMoO4 Microstructures. Issue 3 (20th December 2022)

• Record Type: Journal Article
• Authors: Rajasekhara Reddy, Gutturu; Dhananjaya, Merum; Raghupathy Dillip, Gowra; Lingareddy Manjunath, Gonchigar; Woo Joo, Sang
• Is Part Of: ChemNanoMat. Volume 9:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-20
• Subjects: Self-assembly -- hydrangea flower-like CoMoO4 -- ultra-high energy density -- practical device -- green and red LEDs; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.202200490
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: The accumulation of two‐dimensional nanoflake‐like units into three‐dimensional (3D) hierarchical mesoporous flower‐like microstructures can introduce abundant electroactive surface sites and large contact areas with the electrolyte and enable fast ion/electron transport during the electrochemical process. We propose a simple method of constructing a 3D hydrangea flower‐like mesoporous Mo‐rich CoMoO4 (CMO) electrode via the solvothermal route (CMO‐ETH) with excellent electrochemical characteristics. This morphology arises from the self‐assembly of primary nanoparticles into flake‐like units, then transformed into hydrangea flower‐like microstructures. Compared with the CMO‐DIW battery‐type electrode (hydrothermally synthesized electrode), the CMO‐ETH had a higher specific capacity of 678 C g −1 at a current density of 1 A g −1 . The fabricated CMO‐ETH//activated carbon hybrid supercapacitor (HSC) exhibited an ultra‐high energy density of 103.4 Wh kg −1 at a power density of 750.5 W kg −1 . We also successfully turned on the red and green LEDs for 3 minutes after connecting two HSCs in series. Abstract : A 3D hydrangea flower‐like mesoporous Mo‐rich CoMoO4 microstructure was prepared via a solvothermal technique with remarkable electrochemical performance for supercapacitors. A fabricated hybrid supercapacitor device of CoMoO4 //Activated carbon has an ultra‐high energy density of 103.4 Wh kg −1 at a power density of 750.5 W kg −1 and outstanding cycling stability with 91% capacitance retention after 5000 cycles.