Abstract
Manganese oxide (MnO2) has long been investigated as a pseudo-capacitive material for fabricating fiber-shaped supercapacitors but its poor electrical conductivity and its brittleness are clear drawbacks. Here we electrochemically insert nanostructured MnO2 domains into continuously interconnected carbon nanotube (CNT) networks, thus imparting both electrical conductivity and mechanical durability to MnO2. In particular, we synthesize a fiber-shaped coaxial electrode with a nickel fiber as the current collector (Ni/CNT/MnO2); the thickness of the CNT/MnO2 hybrid nanostructured shell is approximately 150 μm and the electrode displays specific capacitances of 231 mF cm−1. When assembling symmetric devices featuring Ni/CNT/MnO2 coaxial electrodes as cathode and anode together with a 1.0 M Na2SO4 aqueous solution as electrolyte, we find energy densities of 10.97 μWh cm−1. These values indicate that our hybrid systems have clear potential as wearable energy storage and harvesting devices.
Highlights
Manganese oxide (MnO2) has long been investigated as a pseudo-capacitive material for fabricating fiber-shaped supercapacitors but its poor electrical conductivity and its brittleness are clear drawbacks
For the electrical double layer (EDL)-based FSCs7,10,12–17, energy density is governed by the overall capability of the absorbing electrolytes, by having active materials embedded within electrodes
Of the many outstanding achievements, an effort made by Liu et al.[26] is noteworthy: they built up a typical supercapacitor exhibiting 110 mF cm−1 energy density, which appears to be the highest value reported to date for purely EDL-based Fiber-shaped supercapacitors (FSCs)
Summary
Manganese oxide (MnO2) has long been investigated as a pseudo-capacitive material for fabricating fiber-shaped supercapacitors but its poor electrical conductivity and its brittleness are clear drawbacks. When assembling symmetric devices featuring Ni/CNT/MnO2 coaxial electrodes as cathode and anode together with a 1.0 M Na2SO4 aqueous solution as electrolyte, we find energy densities of 10.97 μWh cm−1 These values indicate that our hybrid systems have clear potential as wearable energy storage and harvesting devices. Of the many outstanding achievements, an effort made by Liu et al.[26] is noteworthy: they built up a typical supercapacitor exhibiting 110 mF cm−1 energy density, which appears to be the highest value reported to date for purely EDL-based FSCs. The rGO being electrochemically deposited on nickel-coated multifilament cotton yarns was used as an active material. The pseudo-capacitive FSCs. Redox-active materials, especially inorganic systems such as MnO2, RuO2, Ni(OH)[2], and Co(OH)[2], are highly brittle and exhibit poor electrical conductivity values[27]. Manganese oxide (MnO2) nanoparticles were uniformly deposited on a piece of a CNT sheet via drop casting a dispersion containing MnO2 nanoparticles which was twisted into bi-scrolled yarns
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