Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.128
Publication date: 18th July 2019
The tunable chemistry linked to the organic/inorganic components in colloidal nanocrystals (NCs) and metal-organic frameworks (MOFs) offers a rich playground to advance the fundamental understanding of materials design for various applications. Here, we present an approach which combines these two classes of materials by synthesizing NC/MOF hybrids wherein Ag NCs are in intimate contact with Al-PMOF ([Al2(OH)2(TCPP)], TCPP = tetrakis(4-carboxyphenyl)porphyrin), to form Ag@Al-PMOF. The hybrid thin films are synthesized by combining colloidal chemistry, atomic layer deposition (ALD) and solvothermal chemical conversion, thereby preserving electrical contact of the NCs with a conductive substrate. This key feature has allowed us to explore Ag@Al-PMOF as electrocatalysts for the CO2 reduction reaction (CO2RR) and how the synergistic interactions between the two components improve the catalytic performance. We show that the pristine interface between the NCs and the MOFs accounts for electronic changes in the Ag, which suppress the hydrogen evolution reaction (HER) and promote the CO2RR. We also demonstrate a minor contribution of mass transfer effects imposed by the porous MOF layer under the chosen testing conditions. Furthermore, we find an increased morphological stability of the Ag NCs when combined with the Al-PMOF. The synthesis method is general and applicable to other metal NCs, thus revealing a new way to think about rationally tailored electrocatalytic materials to steer selectivity and improve stability.
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