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

Ömer Faruk Er; Berdan Ulaş; Hilal Demir Kivrak

doi:10.3906/kim-2102-16

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

Turk J Chem. 2021 Aug 27;45(1):1173-1188. doi: 10.3906/kim-2102-16. eCollection 2021.

Authors

Ömer Faruk Er¹, Berdan Ulaş², Hilal Demir Kivrak³

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, Van Yüzüncü Yıl University, Van Turkey.
² Department of Mining Engineering, Faculty of Engineering, Van Yüzüncü Yıl University, Van Turkey.
³ Department of Chemical Engineering, Faculty of Engineering and Architectural Sciences, Eskişehir Osmangazi University, Eskişehir Turkey.

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).

Keywords: Gold; bismuth; carbon nanotube; electrooxidation; glucose; response surface methodology (RSM).