Wet-chemical assisted synthesis of MnSe/ZnO nanostructures as low-resistance robust novel cathode material for advanced hybrid supercapacitors. (5th April 2023)

• Record Type: Journal Article
• Authors: Shah, Muhammad Zia Ullah; Sajjad, Muhammad; Shah, Muhammad Sanaullah; Rahim, Muhammad; Rahman, Shams ur; Hou, Hongying; Khan, Afaq Ullah; Shah, A.
• Is Part Of: New journal of chemistry. Volume 47:Number 17(2023)
• Page Start: 8002
• Page End: 8012
• Publication Date: 2023-04-05
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj05682h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : We proposed a novel MnSe–ZnO-based binary nanocomposite synthesized via a wet-chemical assisted method which deliver high power and energy densities, suppressing previous reports on MnSe and ZnO with decent cycling durability with good rate performance. Abstract : Electrode materials are the key to defining the overall electrochemical performance of energy storage devices and have been an essential hot topic for decades. This study synthesized MnSe-based ZnO composites with MnSe weight ratios (10 and 40%) denoted as ZK-1 and ZK-2 using a simple, cost-effective and economical wet-chemical technique. It investigated their electrochemical characteristics for high-performance hybrid supercapacitors. The comparatively lower resistance of MnSe than that of ZnO (2.40 Ω and 1.45 Ω, respectively) and ZK-2 relative to ZK-1 (1.10 Ω and 0.8 Ω, respectively) give the evident advantages of an improved capacitive energy storage performance owing to their fast faradaic redox reactions due to Mn 3+ /Mn 4+, superior charge storage process, good reversibility and high capacitances of 470 F g −1 and 680 F g −1 at low current rates, respectively. More specifically, at 12 000 cycles, an extraordinarily steady cycling stability of 95.5% was achieved, with a superior energy and power supply of 57.8 W h kg −1 at 13 005 W kg −1 and deficient solution and charge transfer resistance of 1.3 and 6.4 when built as a ZK-2‖AC hybrid supercapacitor. The capacitance, energy and power densities, and low resistance prove the synergistic effect between the MnSe and ZnO nanostructures in a hybrid supercapacitor. Notably, a stable voltage window of 1.75 V in an aqueous solution as an electrolyte boosts the capacitance and power delivery, and thus these seem to be promising electrode materials for advanced hybrid supercapacitors.