MOF-Templated N-Doped Carbon-Coated CoSe2 Nanorods Supported on Porous CNT Microspheres with Excellent Sodium-Ion Storage and Electrocatalytic Properties

• DOI: 10.1021/acsami.8b03607
• Publication Date: 2018-05-02T15:01:15Z
• Authors: Seung-Keun Park; Yun Chan Kang
• Keywords: Nanorod; Carbon fibers

Three-dimensional (3D) porous microspheres composed of CoSe2@N-doped carbon nanorod-deposited nanotube (CNT) building blocks (CoSe2@NC-NR/CNT) can be successfully synthesized using CNT/Co-based metal-organic framework (ZIF-67) as a precursor. This strategy involves the homogeneous coating ZIF-67 polyhedrons onto CNT prepared by spray pyrolysis and further selenization composites under an Ar/H2 atmosphere. During process, on backbone are transformed into N-doped carbon-coated CoSe2 nanorods directional recrystallization resulting in deposition CoSe2@NC microspheres. Such unique structure CoSe2@NC-NR/CNT facilitates transport ions, electrons, mass provides conductive pathway for electrons during electrochemical reactions. Correspondingly, composite exhibits superior dual functionality both electrocatalyst hydrogen evolution reaction (HER) electrode sodium-ion batteries (SIBs). The exhibit small Tafel slope (49.8 mV dec-1) stability HER. Furthermore, delivers high discharge capacity 555 mA h g-1 after 100 cycles at current density 0.2 A good rate capability SIBs.