Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 265, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118597
Keywords
Hydrogen evolution reaction; Electrodeposition; Mesoporous materials; Energy conversion; Water splitting
Funding
- European Union [764977]
- Generalitat de Catalunya [2017-SGR-292]
- Spanish Ministerio de Economia, Industria y Competitividad [MAT2017-86357-C3-1-R]
- FEDER Project
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Homogeneously mesoporous Ni-Pt thin films have been successfully synthesized by potentiostatic electro-deposition from an aqueous solution. The films are single-phase nanocrystalline Ni-Pt fcc solid solution and their composition can be adjusted with the deposition potential to a Ni content within 60-100 at%. The mesoporosity is constantly present, independent of the composition or microstructure, homogeneously distributed in all dimensions of the films with a pore diameter in the order of 10 nm. Film thickness is uniform and in the range of 200-300 nm. The films show improved performance over an electrodeposited Pt film at hydrogen evolution reaction (HER) and excellent stability in H2SO4 during 200 cycles. For the composition 84 at% Ni and 16 at% Pt, the overpotential required to reach a HER activity of -10 mA/cm(2) is as low as - 0.09 V vs. RHE. Meanwhile, the mesoporous alloy film with 95 at% Ni exhibits the highest activity with regard to the electrochemical surface area (ECSA).
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