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Research Article

Ultrathin wavy Rh nanowires as highly effective electrocatalysts for methanol oxidation reaction with ultrahigh ECSA

Xiaoyang Fu1Zipeng Zhao2Chengzhang Wan1Yiliu Wang1Zheng Fan1Frank Song1Bocheng Cao1Mufan Li1Wang Xue1Yu Huang2,3( )Xiangfeng Duan1,3( )
Department of Chemistry and Biochemistry,University of California, Los Angeles,Los Angeles, California,90095,USA;
Department of Materials Science and Engineering,University of California, Los Angeles,Los Angeles, California,90095,USA;
California Nanosystems Institute,University of California, Los Angeles,Los Angeles, California,90095,USA;
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Abstract

Direct methanol fuel cells (DMFCs) have received tremendous research interests because of the facile storage of liquid methanol vs. hydrogen. However, the DMFC today is severely plagued by the poor kinetics and rather high overpotential in methanol oxidation reaction (MOR). Here we report the investigation of the ultrathin Rh wavy nanowires as a highly effective MOR electrocatalyst. We show that ultrathin wavy Rh nanowires can be robustly synthesized with 2-3 nm diameters. Electrochemical studies show a current peak at the potential of 0.61 V vs. reversible hydrogen electrode (RHE), considerably lower than that of Pt based catalysts (~ 0.8-0.9 V vs. RHE). Importantly, with ultrathin diameters and favorable charge transport, the Rh nanowires catalysts exhibit an ultrahigh electrochemically active surface area determined from CO-stripping (ECSACO) of 144.2 m2/g, far exceeding that of the commercial Rh black samples (20 m2/g). Together, the Rh nanowire catalysts deliver a mass activity of 722 mA/mg at 0.61 V, considerably higher than many previously reported electrocatalysts at the same potential. The chronoamperometry studies also demonstrate good stability and CO-tolerance compared with the Rh black control sample, making ultrathin Rh wavy nanowires an attractive electrocatalyst for MOR.

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Nano Research
Pages 211-215
Cite this article:
Fu X, Zhao Z, Wan C, et al. Ultrathin wavy Rh nanowires as highly effective electrocatalysts for methanol oxidation reaction with ultrahigh ECSA. Nano Research, 2019, 12(1): 211-215. https://doi.org/10.1007/s12274-018-2204-8
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Received: 22 May 2018
Revised: 05 September 2018
Accepted: 13 September 2018
Published: 01 October 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018
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