Remarkable bismuth-gold alloy decorated on MWCNT for glucose electrooxidation: the effect of bismuth promotion and optimization via response surface methodology

Authors

ÖMER FARUK ER
BERDAN ULAŞ
HİLAL DEMİR KIVRAK

Abstract

In this study, the carbon nanotube supported gold, bismuth, and gold-bismuth (Au/MWCNT, Bi/MWCNT, and Au-Bi/ MWCNT) nanocatalysts were prepared with NaBH4 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 N2 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/cm2) current density. According to CV results, Au80Bi20/MWCNT nanocatalyst has the highest GAEO activity with the mass activity of 320.15 mA/mg (1.133 mA/cm2). For Au80Bi20/MWCNT, central composite design (CCD) is utilized for optimum conditions of the electrode preparation. Au80Bi20/MWCNT nanocatalysts are promising anode nanocatalysts for direct glucose fuel cells (DGFCs).

DOI

10.3906/kim-2102-16

Keywords

Gold, bismuth, carbon nanotube, glucose, electrooxidation, response surface methodology (RSM)

First Page

1173

Last Page

1188

Recommended Citation

ER, ÖMER FARUK; ULAŞ, BERDAN; and KIVRAK, HİLAL DEMİR (2021) "Remarkable bismuth-gold alloy decorated on MWCNT for glucose electrooxidation: the effect of bismuth promotion and optimization via response surface methodology," Turkish Journal of Chemistry: Vol. 45: No. 4, Article 17. https://doi.org/10.3906/kim-2102-16
Available at: https://journals.tubitak.gov.tr/chem/vol45/iss4/17