6 research outputs found
Trifunctional C@MnO Catalyst for Enhanced Stable Simultaneously Catalytic Removal of Formaldehyde and Ozone
The
key challenge for controlling low concentration volatile organic
compounds (VOCs) is to develop technology capable of operating under
mild conditions in a cost-effective manner. Meanwhile, ozone (O<sub>3</sub>) is another dangerous air pollutant and byproducts of many
emerging air quality control technologies, such as plasma and electrostatic
precipitators. To address these multiple challenges, we report here
a design strategy capable of achieving the following trifunctions
(i.e., efficiently VOCs adsorption enrichment, ozone destruction,
and stable VOCs degradation) from the synergistic effect of adsorption
center encapsulation and catalytic active sites optimization using
2D manganeseÂ(II) monoxide nanosheets decorated carbon spheres with
hierarchical core–shell structure. Carbonous residues in the
as-synthesized MnO<sub><i>x</i></sub> matrices played a
key role for in situ generating homogeneous dispersed unsaturated
MnO during the annealing of the as-synthesized C@MnO<sub><i>x</i></sub> in the flow of argon under a proper calcination temperature
(550 °C). The formation of the intimacy interface between MnO
and carbon not only facilitates the adsorption and subsequent catalytic
reaction but also results in a gatekeeper effect on the protection
of the carbon sphere against the etching of O<sub>3</sub>. Such a
composite architecture achieved the highest stable removal efficiency
(100% for 60 ppm of formaldehyde and 180 ppm of O<sub>3</sub> simultaneously)
and 100% CO<sub>2</sub> selectivity under a GHSV of 60000 mL h<sup>–1</sup> g<sup>–1</sup>. These findings thus open up
a way to address current multiple challenges in air quality control
using a single hierarchical core–shell structure
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High Thermoelectric Performance of a Heterogeneous PbTe Nanocomposite
In this paper, we propose a heterogeneous
material for bulk thermoelectrics.
By varying the quenching time of Na doped PbTe, followed by hot pressing,
we synthesized heterogeneous nanocomposites, a mixture of nanodot
nanocomposites and nanograined nanocomposites. It is well-known that
by putting excess amounts of Na (i.e., exceeding the solubility limit)
into PbTe, nanodots with sizes as small as a few nanometers can be
formed. Nanograined regions with an average grain size of ca. 10 nm
are observed only in materials synthesized with an extremely low quenching
rate, which was achieved by using a quenching media of iced salt water
and cold water. Dimensionless thermoelectric figures of merit, <i>zT</i>, of those heterogeneous nanocomposites exhibited a <i>zT</i> around 2.0 at 773 K, which is a 25% increase compared
to <i>zT</i> of a homogeneous nanodot nanocomposite with
the largest quenching time in our experiment, i.e. furnace cooled.
The power factor increase is 5%, and the thermal conductivity reduction
is 15%; thus, <i>zT</i> increase mainly comes from the thermal
conductivity reduction
Additional file 3 of Statistical modeling of gut microbiota for personalized health status monitoring
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Additional file 4 of Statistical modeling of gut microbiota for personalized health status monitoring
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