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Surface plasmon-enhanced activity and stability for methanol oxidation on gold caviar-like assembly under solar light

Abstract

The surface plasmon-enhanced catalytic performance of gold caviar-like assembly (Au-CA) in methanol electrooxidation was investigated with or without simulated solar irradiation. The Au-CA catalyst synthesized through ion-sputtering method not only exhibited an excellent anodic peak current (115.86 μA μg−1) but also showed long-term catalytic stability for methanol electrooxidation. The Au-CA catalyst also provided an anodic peak current of 248.9 μA μg−1 for methanol electrooxidation under simulated solar irradiation. This value corresponded to 2.15 times of enhancement with respect to that in the absence of solar light irradiation in a deoxygenated solution of 1.0 M KOH and 1.5 M CH3OH. The diffuse reflectance UV–vis absorption spectra and photoelectric response performance of the as-prepared Au-CA catalyst was investigated to understand the effectiveness of Au nanoparticle surface plasmon resonance on the enhancement of methanol electrooxidation. Results showed that the Au-CA catalyst exhibited a broad absorption peak at a wavelength of 515 nm, with a red shift compared with that of the Au nanoparticle solution. The photocurrent density of the Au-CA catalyst was 175.8 μA μg−1 at an irradiation wavelength of 468 nm, and this photocurrent density was 2.5 times higher than that at 640 nm (70.2 μA μg−1) in a deoxygenated solution of 0.5 M Na2SO4. These findings suggested the potential of the new strategy for the improvement of the activity and durability of Au in methanol electrooxidation in direct methanol fuel cell technologies.

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Publication details

The article was received on 09 Mar 2018, accepted on 04 May 2018 and first published on 05 May 2018


Article type: Paper
DOI: 10.1039/C8TA02222D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Surface plasmon-enhanced activity and stability for methanol oxidation on gold caviar-like assembly under solar light

    Y. Liu, F. Chen, Q. Wang, J. Wang, J. Wang and T. T. Gebremariam, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02222D

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