PtM/CNT (M = Mo, Ni, CoCr) Electrocatalysts with Reduced Platinum Content for Anodic Hydrogen Oxidation and Cathodic Oxygen Reduction in Alkaline Electrolytes

• Published in: Catalysts Vol. 13; no. 1; p. 161
• Main Authors: Vernigor, Inna, Bogdanovskaya, Vera, Radina, Marina, Andreev, Vladimir, Grafov, Oleg
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.01.2023
• Subjects: Adsorption; alkaline electrolyte; Alternative energy; Anodizing; bimetallic catalyst; Bimetals; Carbon nanotubes; carbon nanotubes (CNT); Catalysts; Cathodes; Chemical reactions; Chemical reduction; Electrocatalysts; Electrodes; Electrolytes; Fuel cells; Hydrogen; hydrogen electrooxidation; Metals; Molybdenum; Nickel; Oxidation; oxygen electroreduction; Oxygen reduction reactions; Platinum; Rotating disks; Selectivity; Transition metals
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal13010161

Bimetallic catalysts containing platinum and transition metals (PtM, M = Mo, Ni, CoCr) were synthesized on carbon nanotubes (CNTs) functionalized in an alkaline medium. Their platinum content is 10–15% by mass. PtM/CNTNaOH are active in both the hydrogen oxidation reaction (HOR) and the oxygen reduction reaction (ORR) in alkaline electrolytes. Although catalysts based on a single transition metal are inactive in the HOR, their activity in the cathode process of ORR increases relative to CNTNaOH. When using the rotating ring-disk electrode method for ORR, PtM/CNT showed a high selectivity in reducing oxygen directly to water. In HOR, the PtM/CNT catalyst had an activity comparable to that of a commercial monoplatinum catalyst. The results obtained show that it is possible to use the PtM/CNT catalyst in an alkaline fuel cell both as an anode and as a cathode.