Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148143 | International Journal of Hydrogen Energy | 2016 | 9 Pages |
Abstract
Ni-S/CeO2 composite materials for hydrogen evolution reaction (HER) have been prepared by an electrodeposition method under supergravity field from nickel sulfamate. With the different mass concentrations of CeO2, the morphology and X-ray diffraction patterns of Ni-S/CeO2 are diverse. Apparently, the CeO2 contents of Ni-S/CeO2 composite electrodes under supergravity fields are higher than that under normal gravity field. In addition, the HER catalytic activity of Ni-S/CeO2 composite electrodes can be measured in 1.0Â M NaOH at 298Â K. The results show that overpotential of Ni-S/CeO2 electrode of 7Â g/L CeO2 under 3000Â rpm is the least, suggesting perhaps too much content of CeO2 hinder the desorption of Hads, or too little CeO2 can not play palpable roles in improving the catalytic activity and increasing oxygen vacancies. And the exchange current density j0 value of Ni-S/CeO2 composite electrode prepared under the speed of 3000Â rpm, which is 1.16 times larger than the Ni-S/CeO2 of 0Â g/L CeO2, is 1.9 times higher than that under normal gravity field. EIS results suggest that there exists a synergetic effect on HER between CeO2 and Ni-S alloy matrix.
Related Topics
Physical Sciences and Engineering
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Authors
Meiqin Zhao, Haifeng Dong, Zhouhao Chen, Zhipeng Ma, Lixin Wang, Guiling Wang, Wang Yang, Guangjie Shao,