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Operando Evolution of the Structure and Oxidation State of Size-Controlled Zn Nanoparticles during CO2 Electroreduction

MPG-Autoren
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Roldan Cuenya,  Beatriz
Department of Physics, Ruhr-University Bochum;
Interface Science, Fritz Haber Institute, Max Planck Society;

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Zitation

Jeon, H. S., Sinev, I., Scholten, F., Divins, N. J., Zegkinoglou, I., Pielsticker, L., et al. (2018). Operando Evolution of the Structure and Oxidation State of Size-Controlled Zn Nanoparticles during CO2 Electroreduction. Journal of the American Chemical Society, 140(30), 9383-9386. doi:10.1021/jacs.8b05258.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-BA59-A
Zusammenfassung
We explored the size-dependent activity and selectivity of Zn nanoparticles (NPs) for the electrochemical CO2 reduction reaction (CO2RR). Zn NPs ranging from 3 to 5 nm showed high activity and selectivity (~70 %) for CO production, while those above 5 nm exhibited bulk-like catalytic properties. In addition, a drastic increase in hydrogen production was observed for the Zn NPs below 3 nm, which is associated with the enhanced content of low-coordinated sites on small NPs. The presence of residual cationic Zn species in the catalysts was also revealed during CO2RR via operando X-ray absorption fine-structure spectroscopy (XAFS) measurements. Such species are expected to play a role in the selectivity trends obtained. Our findings can serve as guidance for the development of highly active and CO-selective Zn-based catalysts for CO2RR.