Remarkable bismuth-gold alloy decorated on MWCNT for glucose electrooxidation: the effect of bismuth promotion and optimization via response surface methodology |
| |
| Authors: |
mer Faruk ER Berdan ULA Hilal DEM&#x;R KIVRAK |
| |
| Institution: | 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 glucose electrooxidation response surface methodology (RSM) |
|
|
