Nanomaterials are
widely used as redox-type reaction catalysts,
while reactant adsorption and O2 activation are hardly
to be promoted simultaneously, restricting their applications in many
important catalytic fields such as preferential CO oxidation (CO-PROX)
in H2-rich stream. In this work, an interface-enhanced
Co3O4–CuCoO2 nanomesh was
initially synthesized by a hydrothermal process using aluminum powder
as a sacrificial agent. This nanomesh is systematically characterized
by powder X-ray diffraction, scanning electron microscopy, transmission
electron microscopy, N2 adsorption, X-ray photoelectron
spectroscopy, UV–vis absorption spectroscopy, Raman spectroscopy,
X-ray absorption near-edge spectroscopy, hydrogen temperature-programmed
reduction, and oxygen temperature-programmed desorption. It is demonstrated
that the nanomesh possesses high-density nanopores, enabling a large
number of CO adsorption sites exposed to the surface. Meanwhile, electron
transfer from O2– to Co3+/Co2+ and the weakened bonding strength of Co–O bond at surfaces
promoted the oxygen activation and redox ability of Co3O4. When tested as a catalyst for CO-PROX, this nanomesh
with an optimized pore structure and a surface electronic structure,
exhibits a strikingly high catalytic oxidation activity at low temperatures
as well as a broader operation temperature window (i.e., CO conversion
>99.0%, 100–200 °C) in the CO selective oxidation reaction.
The present finding should be highly useful in promoting the quest
for better CO-PROX catalysts, a hot topic for proton exchange membrane
fuel cells and automotive vehicles.
Covalent organic frameworks (COFs) have attracted extensive interests due to their unique structures and various applications. However, structural diversities are still limited, which greatly restricts the development of COF materials....
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.