Co-precipitation synthesis of pseudocapacitive λ-MnO2 for 2D MXene (Ti3C2Tx) based asymmetric flexible supercapacitor

B. Thanigai Vetrikarasan, Abhijith R. Nair, T. Karthick, Surendra K. Shinde, Dae Young Kim, Shilpa N. Sawant, Ajay D. Jagadale

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The rapid growth of wearable/portable electronics imposes a development of flexible, lightweight and highly efficient energy storage devices. In this work, we have synthesized λ-MnO2 nanoplates through one step co-precipitation method and used for flexible asymmetric supercapacitor (SC). The structural, morphological and electrochemical properties of synthesized λ-MnO2 were systematically investigated. The optical and electronic properties of λ-MnO2 were studied using UV–vis spectroscopy and density functional theory (DFT) calculations. The pseudocapacitive λ-MnO2 nanoplates-like electrode showed a maximum specific capacitance of 288.5 F g−1 at the scan rate of 5 mV s−1. To check the practicability, symmetric (λ-MnO2//λ-MnO2) as well as asymmetric (λ-MnO2//AC and λ-MnO2//Ti3C2Tx MXene) SCs were fabricated and their performances were compared. The asymmetric λ-MnO2//Ti3C2Tx MXene SC demonstrated a maximum energy density of 15.5 Wh kg−1 at the power density 1100 W kg−1 along with 86.3 % of capacitive retention after 5000 cycles. Besides, to confirm the suitability of these electrodes for flexible energy storage, a flexible λ-MnO2//Ti3C2Tx asymmetric SC was fabricated using PVA: Na2SO4 gel polymer electrolyte that operated in the potential window of 2 V and supplies high areal energy density of 39.9 μWh cm−2 at a power density of 8586 μW cm−2. Therefore, the λ-MnO2 prepared with a simple and scalable co-precipitation method may play a promising role in flexible energy storage.

Original languageEnglish
Article number108403
JournalJournal of Energy Storage
Volume72
DOIs
StatePublished - 20 Nov 2023

Keywords

  • Flexible hybrid supercapacitor
  • Nanoplate
  • TiCT MXene
  • λ-MnO

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