Hydrogen evolution at Ni foam electrodes and Ni-Sn coated Ni foam electrodes
2023; Elsevier BV; Volume: 663; Linguagem: Inglês
10.1016/j.apcata.2023.119312
ISSN1873-3875
AutoresJelena D. Gojgić, Aleksandar Petričević, T. Rauscher, Christian Immanuel Bernäcker, Thomas Weißgärber, Luka Pavko, Rastko Vasilić, Mila N. Krstajić Pajić, V.D. Jović,
Tópico(s)Fuel Cells and Related Materials
ResumoThe hydrogen evolution reaction (HER) was investigated in 1.0 M KOH at 25 °C at Ni foams with different pore sizes (450–1200 µm), and at the Ni-Sn/Ni foam electrodes, where Ni-Sn alloys were electrodeposited from the pyrophosphate-glycine bath using controlled potential coulometry (CPC) technique. The cross-section analysis revealed that rough Ni-Sn alloy covers complete available inner and outer foam surface, while investigated coating composition varied from 62 to 80 at% Ni (20–38 at% Sn). Comparing the HER polarization curves, the overpotential at j = −200 mA cm−2 was 427 mV lower for Ni-Sn samples than for bare Ni foams, while Tafel slopes changed from − 120 mV dec−1 at bare Ni foams to − 50 mV dec−1 for Ni-Sn/Ni foam samples. The lowest overpotential at − 100 mA cm−2 achieved is as low as − 77 mV. These cathodes could be promising 3D materials for industrial water electrolysis in zero-gap membrane flow cells.
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