Extroversion and Subjective Well-Being Among Korean University Students: The Moderating Role of Attachment.

The purpose of this study was to test the moderating effects of adult attachment in the association between extroversion and subjective well-being in Korea. A total of 334 students recruited from four universities in Korea completed self-reported questionnaires regarding extroversion, attachment, and subjective well-being. The results showed that the innate extroverted orientation of university students affected positive emotions only when the level of attachment avoidance was low. In contrast, although university students had an extroverted orientation, their extroversion did not have a significant influence on positive emotions when their level of attachment avoidance was high. The findings of this study suggest that high levels of attachment avoidance may prevent for extroverts from experiencing positive emotions.

Electrospun Nb-doped TiO2 nanofiber support for Pt nanoparticles with high electrocatalytic activity and durability.

This study explores a facile method to prepare an efficient and durable support for Pt catalyst of polymer electrolyte membrane fuel cell (PEMFC). As a candidate, Nb-doped TiO2 (Nb-TiO2) nanofibers are simply fabricated using an electrospinning technique, followed by a heat treatment. Doping Nb into the TiO2 nanofibers leads to a drastic increase in electrical conductivity with doping level of up to 25 at. % (Nb0.25Ti0.75O2). Pt nanoparticles are synthesized on the prepared 25 at. % Nb-doped TiO2-nanofibers (Pt/Nb-TiO2) as well as on a commercial powdered carbon black (Pt/C). The Pt/Nb-TiO2 nanofiber catalyst exhibits similar oxygen reaction reduction (ORR) activity to that of the Pt/C catalyst. However, during an accelerated stress test (AST), the Pt/Nb-TiO2 nanofiber catalyst retained more than 60% of the initial ORR activity while the Pt/C catalyst lost 65% of the initial activity. The excellent durability of the Pt/Nb-TiO2 nanofiber catalyst can be attributed to high corrosion resistance of TiO2 and strong interaction between Pt and TiO2.