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

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.

Vertically Standing MnO2 Nanowalls Grown on AgCNT-Modified Carbon Fibers for High-Performance Supercapacitors

“…As alternative energy storage devices, supercapacitors have attracted a lot of interest for increasing demands in energy storage equipment for the applications ranging from flexible portable electronics and hybrid-electric vehicles to industry-scale power and energy management, owing to their advantages of fast charge/discharge rate, high power capability, good cycling stability, and safe operation. , Currently, micro/nanoarchitectures formed by carbonaceous materials, , conducting polymers, , metal sulfides, − and transition-metal oxides − have been considered as the promising active materials for the fabrication of supercapacitor electrodes. Among them, manganese oxide, as one of the most promising electrode materials for supercapacitors, has attracted significant attention owing to its high theoretical pseudocapacitance (∼1370 F/g), environmental friendliness, available abundance, and low cost. − However, in practice, MnO 2 suffers from inherent poor electrical conductivity and easy to dense-aggregated morphology, which always results in a low specific capacitance. , To handle this issue, previously we introduced AgCNT composites into an MnO 2 -based supercapacitor system, and we grew MnO 2 with a unique three-dimensional (3D) nanoporous architectural structure . In detail, a nanocomposite 3D honeycomb porous MnO 2 -AgCNT-based electrode was fabricated by depositing nanostructured interconnected MnO 2 nanowalls onto AgCNT-modified textiles using a simple electrodeposition method at room temperature.…”

“…13−19 However, in practice, MnO 2 suffers from inherent poor electrical conductivity and easy to denseaggregated morphology, which always results in a low specific capacitance. 20,21 To handle this issue, previously we introduced AgCNT composites into an MnO 2 -based supercapacitor system, and we grew MnO 2 with a unique three-dimensional (3D) nanoporous architectural structure. 22 In detail, a nanocomposite 3D honeycomb porous MnO 2 -AgCNT-based electrode was fabricated by depositing nanostructured interconnected MnO 2 nanowalls onto AgCNT-modified textiles using a simple electrodeposition method at room temperature.…”

Influence of Ag Doping on the Electrochemical Supercapacitor Characteristics of Manganese Dioxide Prepared by Pulsed Potentiostatic Electrodeposition

“…Besides, many researchers have focused on studying the electrochemical deposition of manganese dioxide films because electrochemical deposition techniques are clean, controllable and straightforward. MnO2 can be synthesized with various electrochemical techniques, such as potentiostatic [22,23], cyclic voltammetry [23], potentiodynamic [24], galvanostatic [17,25] and pulse deposition [25]. In this work, the MnO2 and Ag-doped MnO2 materials were fabricated using the pulse potential electrodeposition technique on the cathode.…”

Investigation of the mechanical properties of Ni-B/hBN composite coatings electrodeposited in presence of CTAB as the surfactant

“…Especially using surfactants as additive has an enormous effect on composite electrodeposition (Afroukhteh et al 2012, Gyawali et al 2014. As a cationic surfactant cetyltrimethylammonium bromide (CTAB) exhibits significant property changes on electrodeposited composite films (Faridi et al 2017, Kan et al 2018. Although the effect of CTAB on the electrodeposition of nickel matrix composite reinforced by some ceramics such as CNTs (Guo et al 2008) and, SiC (Rudnik et al 2010) has been investigated, there is not a single study regarding Ni-B/hBN composite coatings.…”