Electrodeposited Co-Ni-Fe-C Alloys for Hydrogen Evolution in a Hot 8 kmol&middot;m<SUP>&minus;3</SUP> NaOH

Abstract

Active cobalt alloy cathodes for hydrogen evolution in 8 kmolÁm À3 NaOH at 90 C was tailored by electrodeposition. Enhancement of cathodic activity of Co-Ni alloys was carried out by the formation of Co-Ni-Fe-C alloys. The addition of both iron and carbon was effective in enhancing the electrolytic hydrogen evolution activity, and the carbon addition was further effective in preventing preferential dissolution of iron and cobalt, that is, dealloying corrosion during shutdown period in the hot concentrated alkaline solution. The fcc Co-Ni-Fe-C alloys with about 15 at% iron showed the best performance with high hydrogen evolution activity and durability without dealloying corrosion. The alloys with high iron contents forming the bcc structure and showing sufficiently high activity without carbon addition suffered readily dealloying corrosion, and complete prevention of dealloying of the high iron alloys was not achieved by carbon addition.

Enabling Silicon for Solar-Fuel Production

“…As a third component, carbon is also widely used in alloy HER metal catalysts to enhance the charge transfer between metal ions. For example, carbon has been introduced to NiFe, CoFe, and NiCoFe alloys. In these works, the effects of added carbon on the activity and durability have been investigated.…”

(Olin Palladium Award of the Electrochemical Society) The Use of Renewable Energy in the Form of Methane via Electrolytic Hydrogen Generation

“…As shown in Fig. 6 (9) when a MnO 2 anode was used in the electrolysis at the current density of 1000 Am -2 , more than 90% of electricity was consumed for oxygen evolution but about 8 electrocatalyst oxide. However, not only anodic polarization of titanium but also anodic deposition of oxide on the titanium net immediately lead to the formation of an insulator, titanium dioxide.…”

“…The carbon addition is also effective to prevent corrosion of the cathode (8). For instance, the iron addition to Co-Ni alloys significantly accelerated the hydrogen formation.…”

Electrochemistry at Krakowian research institutions

“…The superhydrophobic properties of coatings are also in interest of scientists [43]. Research groups have been collaborating with international groups from Germany [44][45][46][47], Japan [48][49][50][51][52], France [53], Algeria [54] [87][88][89][90][91] is also an important issue for scientists. The topic of SOFC [92] is explored as well.…”