Synthesis and Characterization of Nanostructured Manganese Dioxide Used as Positive Electrode Material for Electrochemical Capacitor with Lithium Hydroxide Electrolyte

Abstract

A nanostructured manganese dioxide electrode material was prepared using a solid-reaction route starting with MnCl 2 •4H 2 O and NH 4 HCO 3 , and its electrochemical performance as a positive electrode for MnO 2 /activated carbon hybrid supercapacitor with 1 mol•L -1 LiOH electrolyte was reported. The material was proved to be a mixture of nanostructured γ-MnO 2 and α-MnO 2 containing some bound water in the structure, which was characterized by X-ray diffraction analysis, infrared spectrum analysis, and transmission electron microscope observation.

New design of electric double layer capacitors with aqueous LiOH electrolyte as alternative to capacitor with KOH solution

“…Hence, EDLCs with e.g. an aqueous lithium hydroxide electrolyte have become today a crucial research trend, though the literature data on aqueous LiOH as an electrolyte for capacitors or hybrid capacitors are scanty; only a limited number of reports on the use of lithium hydroxide electrolyte may be found in the available literature [20][21][22].…”

Comparative Study of Individual and Mixed Aqueous Electrolytes with ZnFe2O4 Nano–flakes Thin Film as an Electrode for Supercapacitor Application

“…Amongst these electrolytes, hydoxy and sulfate based electrolytes with alkali metal cation (KOH, NaOH, H 2 SO 4 and Na 2 SO 4 ) are among the most explored electrolytes, considering their smaller ionic size, high ionic conductivity, low viscosity, low cost and easy availability . However, the corrosive nature of chloride, sulfate and nitrate (Cl − , SO 4 2− , and NO 3 − ) ions limit the cycle stability of the devices . Recently, Qu et al.…”

Enhancement of Electrochemical Capacitance of Carbon Nanotubes by Polythionine Modification

“…Then the corresponding CNT modified electrode was prepared by dropping 5 µL of the above CNT-DMF solution onto a glassy carbon electrode (GCE), and drying under an infrared lamp. The aligned carbon nanotubes (ACNT) with diameter 50-60 nm and length 7-8 µm were synthesized onto silica glasses by a low pressure chemical vapour deposition method and then purified by treating with 20%-30% concentrated HNO 3 . 16 The ACNT electrode was prepared by linking the ACNT-silica glass with a GCE as working electrodes.…”