Open AccessRemarkable bismuth-gold alloy decorated on MWCNT for glucose electrooxidation: the effect of bismuth promotion and optimization via response surface methodology
Author(s) -
Ömer Faruk Er,
Berdan Ulaş,
Hilal Kıvrak
Publication year - 2021
Publication title -
turkish journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.239
H-Index - 46
eISSN - 1303-6130
pISSN - 1300-0527
DOI - 10.3906/kim-2102-16
Subject(s) - nanomaterial based catalyst , cyclic voltammetry , linear sweep voltammetry , chronoamperometry , chemistry , dielectric spectroscopy , bismuth , carbon nanotube , electrochemistry , chemical engineering , nuclear chemistry , nanotechnology , electrode , materials science , catalysis , organic chemistry , engineering
In this study, the carbon nanotube supported gold, bismuth, and gold-bismuth(Au/MWCNT, Bi/MWCNT, and Au-Bi/MWCNT) nanocatalysts were prepared with NaBH 4 reduction method at varying molar atomic ratio for glucose electrooxidation (GAEO). The synthesized nanocatalysts at different Au: Bi atomic ratios are characterized via x - ray diffraction (XRD), transmission electron microscopy (TEM), and N 2 adsorption-desorption. For the performance of AuBi/MWCNT for GAEO, electrochemical measurements are performed by using different electrochemical techniques namely cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Monometallic Au/MWCNT exhibits higher activity than Bi/MWCNT with 256.57 mA/mg (0.936 mA/cm 2 ) current density. According to CV results, Au 80 Bi 20 /MWCNT nanocatalyst has the highest GAEO activity with the mass activity of 320.15 mA/mg (1.133 mA/cm 2 ). For Au 80 Bi 20 /MWCNT, central composite design (CCD) is utilized for optimum conditions of the electrode preparation. Au 80 Bi 20 /MWCNT nanocatalysts are promising anode nanocatalysts for direct glucose fuel cells (DGFCs).