Ni-Based Electrocatalysts for Unconventional CO2 Reduction Reaction to Formic Acid
Josep Albero a, Enrico Lepre a, Julian Heske d, Michal Nowakowski b, Ernesto Scoppola a, Ivo Zizak Zizak c, Tobias Heil Heil a, Thomas D. Kühne d, Markus Antonietti a, Nieves López-Salas a
a Max Planck Institute of Colloids and Interfaces, Research Campus Golm, D-14424 Potsdam, Germany; University of Potsdam, D-14424 Potsdam, Germany
b Department of Chemistry and Center for Sustainable Systems Design, Paderborn University, Warburger Strasse 100, Paderborn 33098, Germany
c Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
d . Dynamics of Condensed Matter and Center for Sustainable Systems Design, Chair of Theoretical Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
Proceedings of International Conference on Frontiers in Electrocatalytic Transformations (INTERECT)
València, Spain, 2021 November 22nd - 23rd
Organizers: Elena Mas Marzá and Ward van der Stam
Contributed talk, Josep Albero, presentation 002
DOI: https://doi.org/10.29363/nanoge.interect.2021.002
Publication date: 10th November 2021

Ni single atoms supported on carbonaceous materials are an appealing solution to revalorize CO 2 due to the low cost and versatility of the support and the optimal usage of Ni and its predicted selectivity and efficiency. Herein, we have used noble carbonaceous support derived from cytosine to load Ni subnanometric sites. The large heteroatom content of the support allows the stabilization of up to 11 wt% of Ni without the formation of nanoparticles. EXAFS analysis points at Ni single atoms or subnanometric clusters coordinated by oxygen in the support. Unlike the well-known N-coordinated Ni single sites selectivity towards CO 2 reduction, O-coordinated-Ni single sites (ca. 7wt% of Ni) reduced CO 2 to CO, but subnanometric clusters (11 wt% of Ni) foster the unprecedented formation of HCOOH with 27% FE at -1.4V. Larger Ni amounts ended up on the formation of NiO nanoparticles and almost 100% selectivity towards HER.

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