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Effect of N, S-doping on the characteristics of functionalized CNTs as a cathodic catalyst for anion-exchange membrane fuel cellsстатья
- Авторы: Korchagin O.V., Vernigor I.E., Radina M.V., Andreev V.N.
- Журнал: Materials Chemistry and Physics
- Том: 332
- Год издания: 2025
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 130289
- DOI: 10.1016/j.matchemphys.2024.130289
- Аннотация: The effect of doping with N and S heteroatoms on the structural characteristics, stability, and activity of acidic (in HNO3) and alkaline (in NaOH) functionalized carbon nanotubes (CNTs) as the cathodic catalyst for H2/O2 fuel cells with an anion-exchange polymer electrolyte is studied. It is found that the surface groups of functionalized CNTs facilitate the incorporation of heteroatoms into the CNT structure during doping. In its turn, N, S-doping leads to an increase of the hydrophilic surface area and the electrochemically accessible CNT surface area. This correlates with an increase of the nitrogen content and is most pronounced in the case of CNTHNO3-NS specimen, which is synthesized by doping CNTs functionalized in an acidic medium. According to the results of RDE and RRDE studies, CNTHNO3-NS is characterized by the highest activity and selectivity in the oxygen reduction reaction (ORR) to water in an alkaline medium. The calculated number of electrons transferred to an oxygen molecule is 3.2 for this specimen. As a component of membrane-electrode assembly (MEA) cathode of H2/O2 fuel cell, CNTHNO3-NS catalyst is superior to the commercial 60Pt/C catalyst (HiSPEC 9100) in the maximum power density.
- Добавил в систему: Андреев Владимир Николаевич