Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/ncomms14559
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Funding
- National Science Foundation [DMR-1409102]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- National Science Foundation
- National Institutes of Health/National Institute of General Medical Sciences under NSF award [DMR-1332208]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1409102] Funding Source: National Science Foundation
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3D porous nanostructures built from 2D delta-MnO2 nanosheets are an environmentally friendly and industrially scalable class of supercapacitor electrode material. While both the electro-chemistry and defects of this material have been studied, the role of defects in improving the energy storage density of these materials has not been addressed. In this work, delta-MnO2 nanosheet assemblies with 150m(2) g(-1) specific surface area are prepared by exfoliation of crystalline KxMnO2 and subsequent reassembly. Equilibration at different pH introduces intentional Mn vacancies into the nanosheets, increasing pseudocapacitance to over 300 Fg(-1), reducing charge transfer resistance as low as 3 Omega, and providing a 50% improvement in cycling stability. X-ray absorption spectroscopy and high-energy X-ray scattering demonstrate a correlation between the defect content and the improved electro-chemical performance. The results show that Mn vacancies provide ion intercalation sites which concurrently improve specific capacitance, charge transfer resistance and cycling stability.
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