Au Nanowires-MWCNTs Modified Electrode for Catalyzing the Oxidization of Glucose†

doi:10.7503/cjcu20160907

Abstract

Abstract:

One-dimensional gold nanowires were prepared using oleylamine as reducing agent, and were assembled with carboxylic multi-walled carbon nanotubes(MWCNTs) through electrostatic adsorption to form a layer-by-layer assembled Au nanowires-MWCNTs on the glassy carbon electrode(GCE) to be used as catalyst for the oxidation of glucose. Electrochemical research results showed that the Au nanowires-MWCNTs/GCE electrode displayed higher catalytic properties than the simple Au nanowires or MWCNTs modified electrode towards the oxidation of glucose. Therefore, a new type of glucose fuel cell was elaborately assembled using Au nanowires-MWCNTs/GCE as the anode and platinum membrane/GCE as the cathod, which showed an open circuit-potential of 0.57 V, a maximum power density of 0.28 mW/cm² at 0.44 V.

Key words: Glucose, Fuel cell, Au nanowires, Multi-walled carbon nanotubes(MWCNTs)

CLC Number:

O646.21

TrendMD:

XU Kaige, ZHANG Di, LEI Jie, PENG Yage, PENG Juan, JIN Xiaoyong. Au Nanowires-MWCNTs Modified Electrode for Catalyzing the Oxidization of Glucose^†[J]. Chem. J. Chinese Universities, 2017, 38(10): 1864.

Figures/Tables 12

Fig.1 SEM images of Au nanowires(A) and MWCNTs(B)

Fig.2 Schematic diagram for the preparation of the Au nanowires-MWCNTs/GCE composite electrode

Fig.3 CV curves of bare GCE(a), MWCNTs/GCE(b), Au nanowires/GCE(c), Au nanowires-MWCNTs/GCE(d) in 10.0 mmol/L K3[Fe(CN)6] solution containing 0.1 mol/L KCl at the scan rate of 100 mV/s

Fig.4 CV curves for electrodeposition process of the Pt film obtained from a solution mixture containing 1.8 × 10-3 mol/L H2PtCl6 and 0.5 mol/L H2SO4 between 0.4 and -0.3 V(vs. SCE) at 100 mV/s

Fig.5 Electrochemical impedance spectra(EIS) in a mixture containing 5.0 mmol/L [Fe(CN)6]3-/4- and 0.1 mol/L KCl at bare GCE(a) and Pt/GCE(b), respectively

Fig.6 CV curves of bare GCE(A), MWCNTs/GCE(B), Au nanowires/GCE(C), Au nanowires-MWCNTs/GCE(LBL2)(D) in 0.5 mol/L NaOH in the absence(dash line) and presence(solid line) of 5 mmol/L glucose at the scan rate of 60 mV/s

Fig.7 CV curves of bare GCE(a), MWCNTs/GCE(b), Au nanowires/GCE(c) and Au nanowires-MWCNTs/GCE(LBL2)(d) in 0.5 mol/L NaOH in the presence 5 mmol/L glucose at the scan rate of 60 mV/s

Fig.8 CV curves of network film electrodes with odd numbers of layers(A) and even numbers of layers(B) in 0.5 mol/L NaOH+20.0 mmol/L glucose at the scan rate of 60 mV/s, the line graphs of the response current(▲) and effective electrode area(■) to the number of assembly layers(C) and the cycling CV curves of Au nanowires-MWCNTs/GCE(LBL5) for 50 cycling times in 0.5 mol/L NaOH+20.0 mmol/L glucose at the scan rate of 60 mV/s(D)(A) a. LBL3; b. LBL5; c. LBL7; d. LBL9. (B) a. LBL2; b. LBL4; c. LBL6; d. LBL8; e. LBL10. Inset of (D) shows the CV curves of the first cycling times(a) and the last cycling times(b).

Fig.9 CV curves of Au nanowires-MWCNTs/GCE(LBL5) in 0.5 mol/L NaOH containing 0, 5.0, 10.0, 20.0, 40.0, 60.0, 80.0, 100.0, 120.0, 140.0 mmol/L glucose at the scan rate of 60 mV/s(A) and CV curves of Au nanowires-MWCNTs/GCE(LBL5) in 0.5 mol/L NaOH solution containing 20.0 mmol/L glucose at scan rates of 20(a), 40(b), 60(c), 80(d), 100(e), 120 mV/s(f)(B), respectivelyInset of (B) shows the plots of anodic and cathodic peak currents vs. v1/2.

Fig.10 Square wave voltammetry of bare GCE(a) and Pt/GCE(b) in 0.1 mol/L of PBS(pH=7.4) solutions saturated with O2

Fig.11 Schematic illustration for the principle of glucose/O2 fuel cell(A) and polarization curve(a) and power density curve(b) at room temperature for a glucose/O2 fuel cell(B)Anode: LBL5 in 0.5 mol/L NaOH cotaining 100.0 mmol/L glucose. Cathode: Pt/GCE in 0.1 mol/L PBS filled with O2.

Table 1 Performance comparison for glucose fuel cell among nanoparticles film electrodes

Mimic enzyme	Open circuit-potential/V	Maximum power density/(μW·cm^-2)	Ref.
Co/NG	0.79	150	[9]
Au_glu/GCE	0.916	307	[32]
3D porous Pd	0.650±0.005	5.7±0.4	[33]
Au nanowires	0.425	126	[19]
MWCNT/(DPDE)^Ⅲ	0.64	182	[17]
Au nanowires-MWCNTs	0.57	280	This work

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