Acetaminophen: a novel redox-additive for snowballing the energy density of flexible supercapacitors

M. Sandhiya, D. Ponraj Jenis, V. Sudha, S. M. Senthil Kumar, R. Thangamuthu, M. Sathish

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Increasing the energy density of carbon-based electrodes is one of the important missions in the field of supercapacitors. The best strategy to proliferate the energy density of a supercapacitor is harnessing redox additives with conventional electrolytes. Here, acetaminophen has been adopted as a redox additive with H2SO4 for the first time to increase the energy density of the supercapacitor electrode. The specific capacitance of the electrode increased 2 times after the addition of acetaminophen with H2SO4. A flexible supercapacitor (FSC) was fabricated using polyvinyl alcohol (PVA)/H2SO4 and acetaminophen/PVA/H2SO4 gel electrolytes. The energy density of the FSC with acetaminophen/PVA/H2SO4 (26.4 W h kg−1) was ∼3-fold higher than that with PVA/H2SO4 (7 W h kg−1). Due to the reversible redox process of acetaminophen to N-acetyl-p-benzoquinone-imine in H2SO4, the electrochemical performance of the supercapacitor electrodes was boosted. The FSC retained 95% of its original capacitance even after 12 000 cycles. Moreover, the ionic conductivity of the PVA/H2SO4 gel electrolyte increased from 2.6 to 9.6 mS cm−1 as a result of adding acetaminophen, which might also be the reason for the excellent energy density of FSC.

Original languageEnglish
Pages (from-to)1724-1734
Number of pages11
JournalSustainable Energy and Fuels
Issue number7
StatePublished - 8 Mar 2023
Externally publishedYes

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology


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