Ge-based intermetallic compounds as materials for catalysts in an electrochemical nitrite reduction reactionтезисы докладаИсследовательская статьяТезисы
Аннотация:IntroductionAn important reaction contributing to the development of hydrogen energy and the potentialreplacement of the Haber–Bosch industrial process for ammonia synthesis is the electrocatalyticnitrogen reduction reaction, as well as the key reactions for optimizing this latter reaction:electrocatalytic nitrate and nitrite reduction reactions. Due to nitrate contamination of agriculturaland industrial wastewater, nitrite contamination can be more dangerous due to the greater toxicityof the nitrite ion. Thus, the search for efficient and low-cost catalysts based on non-preciousmetals and their compositions is currently crucial. In turn, intermetallic compounds (IMCs) arecurrently poorly studied for this purpose and, at the same time, are in demand, since their catalyticefficiency can potentially approach single atomic catalysts (SACs). The aim of our study is tosynthesize IMCs based on Ge and transition metals and test catalysts based on this in theelectrochemical nitrite reduction reaction (NO2–RR).MethodsThe Ge-IMC samples were prepared using arc melting in an argon atmosphere at the AM-200 facility. Mass control of the samples after fusion showed that melting losses did not exceed 1mass%. The physicochemical methods of characterization of Ge-IMC samples were used in thework: UV-vis spectroscopy and XRD. Linear voltammetry and chronoamperometry were used todetermine the optimal conditions for the reactions and synthesis of ammonia, respectively.Autolab PGSTAT302N and PS-20 potentiostats were also used.Results and DiscussionThe results show that the use of Ge electrocatalysts is promising, since excellent values ofFaradaic efficiency (FE) and ammonia yield rate were achieved in the NO2–RR . Moreover, IMCbasedcatalysts showed good results at significantly lower potentials than solid solution catalysts.Acknowledgments: The research was carried out at the expense of the grant of Russian ScienceFoundation (RSF) No 25-29-00488, https://rscf.ru/en/project/25-29-00488/.
