Journal
SMALL
Volume 14, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703237
Keywords
electrodeposition; electrospun carbon nanofibers; growth mechanisms; MnO2; supercapacitors
Categories
Funding
- NC State through Joint School of Nanoscience and Nanoengineering (JSNN)
- DOE [ER46430]
- National Science Foundation [ECCS-1542174]
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Metal oxide/carbonaceous nanomaterials are promising candidates for energy-storage applications. However, inhomogeneous mass and charge transfer across the electrode/electrolyte interface due to unstable metal oxide/carbonaceous nanomaterial synthesis limit their performance in supercapacitors. Here, it is shown that the above problems can be mitigated through stable low-current electrodeposition of MnO2 on superaligned electrospun carbon nanofibers (ECNFs). The key to this approach is coupling a self-designed four steel poles collector for aligned ECNFs and a constant low-current (40 mu A) electrodeposition technique to form a uniform Na+-induced alpha-MnO2 film which proceeds by a time-dependent growth mechanism involving cluster-kebab structures and ending with a compact, uniform MnO2 film for high-performance energy storage.
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