Dendritic NiCu nanopearl chains for electrocatalytic production of hydrogen in acidic media

LIU Lu; HE Jianbo

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Dendritic NiCu nanopearl chains for electrocatalytic production of hydrogen in acidic media

LIU Lu,HE Jianbo * #

School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China （No.No. 20130111110025）

Opened online:22 February 2016

Accepted by: none

Citation: LIU Lu,HE Jianbo.Dendritic NiCu nanopearl chains for electrocatalytic production of hydrogen in acidic media[OL]. [22 February 2016] http://en.paper.edu.cn/en_releasepaper/content/4678239

Dendritic NiCu nanopearl chains in 1:1 atom ratio were galvanostatically deposited on a Cu substrate for catalyzing hydrogen evolution reaction (HER) in H2SO4 electrolytes. The morphology and composition of the deposits were characterized by FE-SEM/EDX analysis. All the four-level branches of the dendritic nanoalloy grow in a pearl chain structure of nanoparticles with a diameter of ca. 50-80 nm. The electrocatalytic activity to HER was studied by linear polarization and chronopotentiometry. At the NiCu nanoalloy electrode, the exchange current density of HER was 2836 times higher than at Cu electrode, while the overpotential at a current density of 50 mA cm-2 was decreased by 265 mV. The NiCu nanoalloy can not only significantly reduce the charge transfer resistance of HER, but also facilitate the elimination of the generated hydrogen from the active sites. This work indicates that the dendritic NiCu nanochains may be a potent candidate as a non-noble metal catalyst for hydrogen energy production.

Keywords:electrocatalysis; dendritic nanochain; NiCu nanoalloy; hydrogen energy

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