Open AccessRedox mediator induced electrochemical reactions at the electrode‐electrolyte interface: Making sodium‐ion supercapacitors a competitive technology
Author(s) -
Chowdhury Ananya,
Biswas Sudipta,
Singh Trilok,
Chandra Amreesh
Publication year - 2022
Publication title -
electrochemical science advances
Language(s) - English
Resource type - Journals
ISSN - 2698-5977
DOI - 10.1002/elsa.202100030
Subject(s) - pseudocapacitor , redox , electrolyte , electrochemistry , supercapacitor , inorganic chemistry , ferricyanide , chemistry , electrode , chemical engineering , materials science , engineering
The specific capacitance values of Na‐ion supercapacitor can now compete with other well‐established pseudocapacitors. This is obtained by using redox additive modified electrolytes in combination with hierarchical nanostructures of NaMnPO 4 . Modifying the conventionally used electrolyte, that is: NaOH, with redox additives such as potassium ferricyanide [K 3 Fe(CN) 6 ] and potassium iodide (KI), can induce nearly 50% enhancement in the specific capacitance. The enhancement is also retained in full cell, fabricated using NaMnPO 4 and activated carbon as the positive and negative electrodes, respectively. Redox mediators stimulate extra redox pairs and higher ionic conductivity, leading to enhanced electrochemical reactions at the electrode‐electrolyte interface.