Hybrid MnO₂ Film with Agarose Gel for Enhancing the Structural Integrity of Thin Film Supercapacitor Electrodes

Abstract

We report on the fabrication of a robust hybrid film containing MnO2 for achieving large areal capacitances. An agarose gel, as an ion-permeable and elastic layer coated on a current collector, plays a key role in stabilizing the deposited pseudocapacitive MnO2. Cyclic voltammetry and electrochemical impedance spectroscopy data indicate that the hybrid electrode is capable of exhibiting a high areal capacitance up to 52.55 mF cm(-2), with its superior structural integrity and adhesiveness to the current collector being maintained, even at a high MnO2 loading.

MnO2 nanostructures with three-dimensional (3D) morphology replicated from diatoms for high-performance supercapacitors

“…[1][2][3] Until now, manganese oxides with various structures and morphologies such as nanosheets, 4 hollow nanospheres, 5 nanoowers, 6 nanowires/nanorods, 7,8 thin lms, 9 and nanotubes 10 have been fabricated via electrochemical and chemical routes, and their electrochemical properties have been investigated. [1][2][3] Until now, manganese oxides with various structures and morphologies such as nanosheets, 4 hollow nanospheres, 5 nanoowers, 6 nanowires/nanorods, 7,8 thin lms, 9 and nanotubes 10 have been fabricated via electrochemical and chemical routes, and their electrochemical properties have been investigated.…”

Morphology and crystallinity-controlled synthesis of manganese cobalt oxide/manganese dioxides hierarchical nanostructures for high-performance supercapacitors

“…Up to now, MnO 2 with diverse structures and morphologies (such as nanosheets [4], hollow nanospheres [5], nanoflowers [6], nanowires/nanorods [7,8], thin films [9], and nanotubes [10]) and different crystalline phases (such as a [11], b [12], g [13], and d [14]) have been fabricated via electrochemical and chemical routes, and their electrochemical properties have been investigated. These studies indicate that the outstanding nanostructures and crystalline phases of the MnO 2 materials have been regarded as critical factors to influence their properties.…”

Rational design of hierarchically porous birnessite-type manganese dioxides nanosheets on different one-dimensional titania-based nanowires for high performance supercapacitors

“…It is apparent that MnO 2 /TiO 2 NWs have a much smaller R ct than MnO 2 / H 2 Ti 3 O 7 NWs. The slope of 45 portion in the transitory frequency next to the semicircle and the noticeable linear part at the low frequency region of the respective Nyquist plots is called Warburg resistance (W) [49], which originates from the frequency dependence of ion diffusion/transport from the electrolyte to the electrode surface [50,51]. As shown in the Fig.…”