A Comparative Study on Ag-Doped and Surfactant Assisted MnO2Prepared by Direct and Pulse Current Electrodeposition on Surgical Grade Stainless Steel as High-Performance Supercapacitor

Mohammad Faridi,Hamideh Kalhor,Mohammad H Dadjoo,Alireza Nari

doi:10.5935/0103-5053.20160160

Abstract

Direct and pulse current electrodeposition techniques were applied for preparation of novel electro-active manganese oxides. The influences of Ag doping and addition of cetyltrimethylammonium bromide (CTAB) on electrochemical properties were discussed. The morphology and structure of the electrodes are studied by different techniques including field emission scanning electron microscopy (FE-SEM), contact angle and X-ray photoelectron spectroscopy (XPS). Electrochemical behavior of the samples are investigated by cyclic voltammetry (CV), constant current charge-discharge (CC), and electrochemical impedance spectroscopy (EIS). The specific capacitances were measured to be 269, 315, 435, 442, 480 and 508 F g-1 for M-g, M-p, MC-g, MC-p, MCA-g and MCA-p (current density = 1 A g-1), respectively. The MCA-p exhibit high specific capacitance, excellent cycling stability (only 7.5% loss after 1000 cycles at 1 A g-1), and high energy densities (71 Wh kg-1). Ag doping and addition of CTAB which provides more active sites for the pseudocapacitive reactions.

Highlights

Research on electrochemical capacitors (ECs) has generated growing attention from both academia and industry in recent years, with efforts focused on developing safe, stable, high energy/power density, and low cost materials.[1]
For a manganese oxide supercapacitor, the oxide film can be deposited on many substrates, which act as current collectors
The characteristics of MnO2 active materials were investigated by field emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), contact angle, constant current charge-discharge (CC), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV)

Summary

Introduction

Research on electrochemical capacitors (ECs) has generated growing attention from both academia and industry in recent years, with efforts focused on developing safe, stable, high energy/power density, and low cost materials.[1]. Pulse deposition as one of essential techniques has been useful to synthesize different thin films It can improve chemical-physical properties of active materials.[21,22] For a manganese oxide supercapacitor, the oxide film can be deposited on many substrates, which act as current collectors. The manganese oxide films were electrodeposited by the direct galvanostatic and pulse current methods from potassium permanganate electrolyte, respectively. The characteristics of MnO2 active materials were investigated by field emission scanning electron microscope (FE-SEM), X-ray photoelectron spectroscopy (XPS), contact angle, constant current charge-discharge (CC), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The water drops (1 mL, ultra-pure) put onto the film surface using vertical syringe The electrochemical techniques such as CV, CC and EIS were used to study the capacitance of the modified working electrodes. The galvanostatic charge-discharge cycling between 0 and 1 V

A Comparative Study on Ag-Doped and Surfactant Assisted MnO2

Results and Discussion

Conclusions