Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 3, Pages 2867-2874Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c00146
Keywords
iron; single-atom catalyst; atomic layer deposition; CO oxidation; photocatalytic degradation
Funding
- National Science Foundation [NSF 1803812]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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We report a general strategy to synthesize Fe single-atom catalysts (SACs) on various substrates (e.g., multiwalled carbon nanotubes, SiO2, and TiO2) with high Fe loading (>1.5 wt %) by atomic layer deposition (ALD) through optimization of ferrocene (Fe precursor) dose time. Fe/SiO2 and Fe/TiO2 SACs were used for CO oxidation reactions and catalytic degradation of a methylene blue (MB) solution, respectively. Compared with reported iron oxide catalysts, the efficiency of Fe/SiO2 for CO oxidation was more than 2 orders of magnitude higher than the reported values. The photocatalysis experiment demonstrated that TiO2 nanoparticles, deposited with two cycles of Fe ALD, showed the highest activity and had a more than 6-fold photocatalytic activity enhancement over pure TiO2 for the degradation of MB. This universal method, optimized Fe ALD, expands the potential applications of Fe SACs on different substrates.
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