Photo/Electrocatalytic Hydrogen Peroxide Production by Manganese and Iron Porphyrin/Molybdenum Disulfide Nanoensembles.

The oxygen reduction reaction (ORR) 2e pathway provides an alternative and green route for industrial hydrogen peroxide (H O ) production. Herein, the ORR photo/electrocatalytic activity in the alkaline electrolyte of manganese and iron porphyrin (MnP and FeP, respectively) electrostatically associated with modified 1T/2H MoS nanosheets is reported. The best performing catalyst, MnP/MoS , exhibits excellent electrocatalytic performance towards selective H O formation, with a low overpotential of 20 mV for the 2e ORR pathway (E  = 680 mV vs RHE) and an H O yield up to 99%.

Covalently functionalized layered MoS supported Pd nanoparticles as highly active oxygen reduction electrocatalysts.

Molybdenum disulfide nanosheets covalently modified with a 1,2-dithiolane derivative were used as a novel substrate for the immobilization of Pd nanoparticles (PdNPs) towards the development of a highly efficient hybrid electrocatalyst, namely PdNPs/f-MoS2, for the oxygen reduction in an alkaline medium. The newly prepared hybrid material was thoroughly characterized through complementary techniques such as Raman and IR spectroscopy, TGA, HRTEM, STEM/EELS, and EDS. The PdNPs/f-MoS2 nanohybrid exhibited excellent performance towards oxygen electroreduction with a positive onset potential of +0.

Core-Shell Pd@M (M=Ni, Cu, Co) Nanoparticles/Graphene Ensembles with High Mass Electrocatalytic Activity Toward the Oxygen Reduction Reaction.

Herein, it is demonstrated that pyrene butyric acid (PBA)-stabilized metal nanoparticles with core-shell morphology, Pd@M (M=Ni, Cu, Co), non-covalently supported on graphene (G) sheets, are more active towards oxygen electroreduction in alkaline environments than the benchmark Pd/C catalyst, albeit with a 70 % lower precious metal loading. The PBA-stabilized Pd@M (M=Ni, Cu, Co)/G ensembles were prepared by employing a simple modified polyol method and galvanic replacement and thoroughly characterized with advanced microscopy imaging and complementary spectroscopic techniques. Electrochemical studies revealed that Pd@Ni /G presents the optimum performance, exhibiting a 30 mV more positive onset potential and 3.

Toxicity determinants of multi-walled carbon nanotubes: The relationship between functionalization and agglomeration.

The elucidation of toxicity determinants of multi-walled carbon nanotubes (MWCNT) is still incomplete. Functionalization with carboxyl groups is, however, commonly used to mitigate MWCNT toxicity, although the rationale for the mitigating effect has not been fully clarified yet. In this work, two optimized chemical vapor deposition methods were employed to obtain MWCNT of comparable length but different diameter, which were subsequently functionalized.

Tensile and microindentation properties of maxillofacial elastomers after different disinfecting procedures.

Statement Of Problem: Daily disinfection of maxillofacial prosthesis may reduce their service-life and lead to replacement.

Purpose: The purpose of this study was to evaluate possible alterations in the mechanical behavior of two maxillofacial elastomers after application of four different disinfection procedures.

Material And Methods: The materials tested were two maxillofacial elastomers, a commercially available polydimethylsiloxane (PDMS) and an experimental chlorinated polyethylene (CPE).