Symmetrical MnO2-carbon nanotube-textile nanostructures for wearable pseudocapacitors with high mass loading
Alshareef, Husam N.
KAUST DepartmentMaterials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
Advanced Membranes and Porous Materials Research Center
Functional Nanomaterials and Devices Research Group
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AbstractWhile MnO2 is a promising material for pseudocapacitor applications due to its high specific capacity and low cost, MnO2 electrodes suffer from their low electrical and ionic conductivities. In this article, we report a structure where MnO2 nanoflowers were conformally electrodeposited onto carbon nanotube (CNT)-enabled conductive textile fibers. Such nanostructures effectively decrease the ion diffusion and charge transport resistance in the electrode. For a given areal mass loading, the thickness of MnO2 on conductive textile fibers is much smaller than that on a flat metal substrate. Such a porous structure also allows a large mass loading, up to 8.3 mg/cm2, which leads to a high areal capacitance of 2.8 F/cm2 at a scan rate of 0.05 mV/s. Full cells were demonstrated, where the MnO2-CNT-textile was used as a positive electrode, reduced MnO2-CNT-textile as a negative electrode, and 0.5 M Na2SO4 in water as the electrolyte. The resulting pseudocapacitor shows promising results as a low-cost energy storage solution and an attractive wearable power. © 2011 American Chemical Society.
SponsorsWe thank Dr. Judy Cha for her helpful discussion and assistance in some sample characterizations. W.C. thanks the support from a KAUST Graduate Fellowship. X.X. acknowledges the support from the Stanford Graduate Fellowship. Y.C. acknowledges the funding support from the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-11-001-12).
PublisherAmerican Chemical Society (ACS)