Integrating RuCo alloy in N-doped carbon nanofiber for efficient hydrogen evolution in alkaline media

Ruthenium (Ru) is considered as a promising element for constructing alkaline hydrogen evolution (HER) catalysts due to its rapid water dissociation kinetics and low-cost advantages than Pt. Alloying can optimize the electrochemical performance of metals and reduce the usage of the noble metal. Herin, RuCo alloy nanoparticles were grown in-situ on N-doped carbon nanofibers (RuCo/NCNF) by electrospinning and graphitization. Under thermodynamic driving force, the Ru and Co elements formed RuCo alloys. It is worth noting that the Ru not only improved the catalytic performance, but also reduced the nanoparticle size and exposing more active sites. Moreover, N-doped carbon nanofiber was not only used to load RuCo alloy nanoparticle, but also as a good substrate for the HER reaction. Therefore, the RuCo/NCNF had fabulous catalytic activity in alkaline media. Furthermore, the in-situ growth also endowed the RuCo/NCNF with excellent stability, HER performance was not significantly reduced even after 40 h stability test. And when the Ru:Co = 1:8, RuCo/NCNF had the excellent HER catalytic performance. Only 41 mV was required to drive a current density of 10 mA cm-2, with Tafel Slope as low as 64.8 mV dec-1.(c) 2023 Published by Elsevier B.V.

Automated summary

RuCo alloy nanoparticles were grown in-situ on N-doped carbon nanofibers, resulting in improved catalytic performance, reduced nanoparticle size, and increased active sites. The N-doped carbon nanofiber served as both a support and a substrate for the hydrogen evolution reaction, providing excellent catalytic activity and stability in alkaline media. The RuCo/NCNF with a Ru:Co ratio of 1:8 exhibited outstanding catalytic performance with low Tafel slope and low overpotential.