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Manuscript_PCN-250.pdf (2.42 MB)
Metal Oxide Decorated Porous Carbons from Controlled Calcination of a Metal-Organic Framework
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submitted on 15.11.2019 and posted on 25.11.2019by Gregory S. Day, Jialuo Li, Elizabeth A. Joseph, Peter Metz, Zachary Perry, Matthew R. Ryder, Katharine Page, Hong-Cai Zhou
Thermal decomposition of an iron-based MOF was
conducted under controlled gas environments to understand the resulting porous
carbon structure. Different phases and crystallite sizes of iron oxide are
produced based on the specific gas species. In particular, air results in
iron(III) oxide, and D2O and CO2 results in the mixed
valent iron (II,III) oxide. Performing the carbonization under non-oxidative or
reducing conditions (N2, He, H2) results in the formation
of a mixture of both iron (II,III) oxide and iron (III) oxide. Based on in situ
and air free handling experiments, it was observed that this is partially due
to the formation of zero-valent iron metal that is rapidly oxidized when
exposed to air. Neutron pair distribution function analysis provided insight
into the effect of the gas environment on the local structure of the porous
carbon, indicating a noticeable change in local order between the D2O
and the N2 calcined samples.