The development of catalysts with high chlorine resistance
for
volatile organic compound (VOC) degradation is of great significance
to achieve air purification. Herein, Pd@ZrO2 catalysts
with monodispersed Pd atoms coordinated with Cl were prepared using
an in situ grown Zr-based metal–organic framework
(MOF) as the sacrifice templates to enhance the chlorine resistance
for VOC elimination. The residual Cl species from the Zr-MOF coordinated
with Pd, forming Pd1–Cl species during the pyrolysis.
Meanwhile, abundant oxygen vacancies (VO) were generated,
which enhanced the adsorption and activation of gaseous oxygen molecules,
accelerating the degradation of VOCs. In addition, the Pd@ZrO2 catalysts exhibited satisfactory water resistance, long-term
stability, and great resistance to CO and dichloromethane (DCM) for
VOC elimination. In situ diffuse reflectance infrared
Fourier transform spectroscopy (DRIFTS) results elucidated that the
generation of Pd1–Cl species in Pd@ZrO2 suppressed the absorption of DCM, releasing more active sites for
toluene and its intermediate adsorption. Simultaneously, the monodispersed
Pd atoms and VO improved the reactivity of gaseous oxygen
molecule adsorption and dissociation, boosting the deep decomposition
of toluene and its intermediates. This work may provide a new strategy
for rationally designing high-chlorine resistance catalysts for VOC
elimination to improve the atmospheric environment.
With the merits of high energy density and environmental friendliness, lithium-sulfur battery (LSB) has been perceived as a next-era energy storage device. However, issues such as insulating nature of sulfur,...
Potassium-ion batteries (KIBs) are gradually being considered as an alternative for lithium-ion batteries because of their non-negligible advantages such as abundance and low expenditure of K, as well as higher electrochemical potential than another alternativesodium-ion batteries. Nevertheless, when the electrode materials are inserted and extracted with large-sized K + ions, the tremendous volume change will cause the collapse of the microstructures of electrodes and make the charging/discharging process irreversible, thus disapproving their extended application. In response to this, we put forward a feasible strategy to realize the in situ assembly of layered MoSe 2 nanosheets onto N, P codoped hollow carbon nanospheres (MoSe 2 / NP-HCNSs) through thermal annealing and heteroatom doping strategies, and the resulting nanoengineered material can function well as an anode for KIBs. This cleverly designed nanostructure of MoSe 2 /NP-HCNS can broaden the interlayer spacing of MoSe 2 to boost the efficiency of the insertion/extraction of K ions and also can accommodate large volume change-caused mechanical strain, facilitate electrolyte penetration, and prevent the aggregation of MoSe 2 nanosheets. This synthetic method generates abundant defects to increase the amounts of active sites, as well as conductivity. The hierarchical nanostructure can effectively increase the proportion of pseudo-capacitance and promote interfacial electronic transfer and K + diffusion, thus imparting great electrochemical performance. The MoSe 2 /NP-HCNS anode exhibits a high reversible capacity of 239.9 mA h g −1 at 0.1 A g −1 after 200 cycles and an ultralong cycling life of 161.1 mA h g −1 at 1 A g −1 for a long period of 1000 cycles. This nanoengineering method opens up new insights into the development of promising anode materials for KIBs.
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.