Synthesis of Si-Doped CNT and Its Catalytic Ability in Hydrogen Evolution Reaction
Pourya Bakhshi, Prof. Hossein Tavakol
ChemistrySelect 4(2), pp. 521-526
hSilicon doped carbon nanotubes (SiCNTs) have been synthesized using Fe/CaCO3 as catalyst and acetylene and silane as precursors using chemical vapor deposition (CVD). The growth temperature was considered as a variable and its effect on the structure of the product was investigated. All conditions were optimized and the optimum temperature was 650 °C. The insertion of silicon atom in the structure of carbon nanotubes showed some changes in the properties and structure of this product, which have been investigated using FESEM, TEM, XRD, Raman, EDS, DTA and TGA. The produced SiCNTs showed high thermal stabilities, based on the results of TGA and DTA analyses. The electrocatalytic properties of SiCNTs were examined in hydrogen evolution reaction (HER) and according to the obtained LSV and Tafel diagrams (based on comparing them with the previous reports for non-metal electrocatalyst), the prepared SiCNTs have shown acceptable values (the second rank for each case) for onset potential, Tafel slope and η, which confirmed its appropriate electrocatalytic ability for HER.