Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145252 | International Journal of Hydrogen Energy | 2017 | 8 Pages |
Abstract
In this work, preparing three nickel-based carbon composite catalysts (Ni-OCNT, Ni-ONC and Ni-rGO) by supergravity field electrodeposition for hydrogen evolution reaction (HER) from nickel sulfamate bath containing suspended nano-sized carbon materials. The crystal structure, morphology and chemical compositions of the composite catalysts were characterized by XRD and SEM measurements. The electrochemical activity of composite coatings for HER was determined by polarization measurement and electrochemical impedance spectroscopy in 1.0Â M NaOH solution. The prepared nickel-based carbon composite catalysts exhibit a significant enhancement in electrocatalytic activity for HER compared with pure Ni electrode. In addition, the Ni-rGO, Ni-ONC, Ni-OCNT catalysts prepared under supergravity field demand overpotentials of 245, 177, 91Â mV and 286, 224, 154Â mV and 330, 286, 222Â mV to drive current densities of 80, 30, 10Â mAÂ cmâ2, respectively. Ni-rGO cathode presents excellent HER activity with lowest overpotentials.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Lixin Wang, Yao Li, Xucai Yin, Yazhou Wang, Lin Lu, Ailing Song, Meirong Xia, Zhiping Li, Xiujuan Qin, Guangjie Shao,