MnOx-decorated carbonized porous silicon nanowire electrodes for high performance supercapacitors


Ortaboy S. , ALPER J. P. , ROSSI F., BERTONI G., Salviati G., Carraro C., ...Daha Fazla

ENERGY & ENVIRONMENTAL SCIENCE, cilt.10, sa.6, ss.1505-1516, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Konu: 6
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1039/c7ee00977a
  • Dergi Adı: ENERGY & ENVIRONMENTAL SCIENCE
  • Sayfa Sayıları: ss.1505-1516

Özet

In this study, manganese oxide (MnOx)-decorated carbonized porous silicon nanowire arrays (MnOx/C/PSiNWs) are synthesized through eco-friendly and cost-effective processes. This electrode material system exhibits excellent electrochemical behavior with a specific capacitance reaching 635 F g(-1), as well as the highest areal power (100 mWcm(-2)) and energy (0.46 mW h cm(-2)) ever reported in a silicon nanowire-based pseudocapacitor electrode. Furthermore, an asymmetric hybrid supercapacitor (AHS) is designed using MnOx/C/PSiNWs as the positive electrode, carbonized porous silicon nanowires (C/PSiNWs) as the negative electrode and 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI)/acetonitrile as the electrolyte. The supercapacitor shows an excellent power density of 25 kW kg(-1) and an energy density of 261 W h kg(-1) at a current density of 0.2 mA cm(-2) with a large operational potential window (3.6 V) and a good capacitance retention (82% after 10 000 CV cycles). The results show that the MnOx/C/PSiNW electrodes are promising materials for the future generation of high performance supercapacitors.