During deactivation, the catalyst transformed either to structures consisting of NiO nanoblocks or hollow NiO shells. Atomic level transmission electron microscopy showed that the core-shell co-catalyst structures deactivated primarily due to a loss of metallic Ni from the core structure. Increased H2 production was found to be related to an increase in the thickness of NiO shell due to suppression of the back reaction. Core-shell polymers are structured composite particles consisting of at least two different components, one at the center as a core and surrounding by the second as a shell. Core-shell co-catalysts with different morphologies resulted in large changes in photocatalytic activity. The phase transformations occurring during deactivation were associated with Ni diffusion processes that are driven by light illumination.ĪB - Ni-NiO core-shell co-catalyst structures on Ta2O5 have been investigated for solar H2 production. Atomic level transmission electron microscopy showed that the core-shell co-catalyst structures deactivated primarily due to a loss of metallic Ni from the core structure. Hydrogen peroxide (H2O2), an environmentally friendly oxidant, has already been widely used in many chemical synthesis and industrials as an. Increased H2 production was found to be related to an increase in the thickness of NiO shell due to suppression of the back reaction. N2 - Ni-NiO core-shell co-catalyst structures on Ta2O5 have been investigated for solar H2 production. Cowley Center for High Resolution Microscopy at Arizona State University is gratefully acknowledged. The support from US Department of Energy ( DE-SC0004954 ) and the use of TEM at John M.
T1 - Structure-reactivity relationships of Ni-NiO core-shell co-catalysts on Ta2O5 for solar hydrogen production
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