Journal
ELECTROCHIMICA ACTA
Volume 299, Issue -, Pages 405-414Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.12.169
Keywords
Hydrogen evolution reaction; Electrocatalyst; Sm2O3; Ni-Co film; Electrodeposition
Categories
Funding
- Postgraduate Innovation Fund Project of SWUST [18YCX067]
- Longshan Academic Talent Research Supporting Program of SWUST [18LZX322, 17LZX406]
- National Natural Science Foundation of China [41872039, 41831285]
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The development of highly efficient and stable noble-metal-free electrocatalysts towards HER is of great significance. Herein, an electrodeposition method for the preparation of samarium oxide modified Ni-Co vertical nanosheets assembled three-dimensional honeycomb film on porous Ni foam (Sm2O3-Ni-Co/NF) is proposed. As-prepared Sm2O3-Ni-Co vertical nanosheets interweave together into a honeycomb morphology and uniformly cover the entire surface of Ni foam. The influence of content of Sm2O3 in electroplating bath on the electrocatalytic performances of Sm2O3-Ni-Co/NF electrode towards HER is studied in 1.0M KOH electrolyte. Polarization curve indicates that the self-supported Sm2O3-Ni-Co/NF electrode exhibits remarkably enhanced electrocatalytic activity towards HER. To attain a current density of 10mAcm(-2), Sm2O3-Ni-Co/NF electrode needs lower overpotential (276mV) than Ni-Co/NF electrode (301 mV). In addition, Sm2O3-Ni-Co/NF electrode exhibits a lower Tafel slope, demonstrating more favorable HER kinetics. Sm2O3-Ni-Co/NF electrode has smaller charge transfer resistance than Ni-Co/NF electrode, indicating a faster Faradic process and better HER kinetics. Besides, Sm2O3-Ni-Co/NF electrode features satisfactory long-term durability in alkaline media. The results indicate that Sm2O3-Ni-Co/NF electrode has potential application to water splitting devices for hydrogen generation. (C) 2019 Elsevier Ltd. All rights reserved.
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