1,721,168 research outputs found
Book Review: \u3ci\u3eNew Directions in Technological Pedagogical Content Knowledge Research: Multiple Perspectives\u3c/i\u3e by Myint Swe Khine
No full textBook review by Jackie HeeYoung Kim of New Directions in Technological Pedagogical Content Knowledge Research: Multiple Perspectives by Myint Swe Khine
The Effects of Online Peer Tutoring on Motivation and Higher Mental Operation in Online Discussion
No full textGeorgia Southern faculty member, Jackie HeeYoung Kim\u27s work was published in the Proceedings of Society for Information Technology & Teacher Education International Conference 2016
Upending the learning design: Will flipping the classroom work for everyone?
No full textGeorgia Southern faculty member, Jackie HeeYoung Kim\u27s work was published in the Proceedings of EdMedia: World Conference on Educational Multimedia and Technology
Plasmonic hot carrier-driven photoelectrochemical water splitting on antenna-reactor Pt/Ag/TiO2 Schottky nanodiodes
No full textPlasmonic photoelectrochemical (PEC) water splitting has excited immense interest, as it can overcome the intrinsic limitations of semiconductors, in terms of light absorption, by the localized-surface plasmon resonances effect. Here, to get insight into the role of plasmonic hot carriers in plasmonic water splitting, a rational design of an antenna-reactor type Pt/Ag/TiO2 metal-semiconductor Schottky nanodiode was fabricated and used as a photoanode. Using the designed PEC cell system combined with the Pt/Ag/TiO2 nanodiode, we show that the plasmonic hot carriers excited from Ag were utilized for the oxygen (O-2) evolution reaction and, consequently, had a decisive role in the enhancement of the photocatalytic efficiency. These results were supported by finite-difference time-domain simulations, and the faradaic efficiency was measured by the amount of actual gas produced. Therefore, this study provides a deep understanding of the dynamics and mechanisms of plasmonic hot carriers in plasmonic-assisted PEC water splitting. Published under an exclusive license by AIP Publishing.11Nsciescopu
Enhanced flux of chemically induced hot electrons on a Pt nanowire/Si nanodiode during decomposition of hydrogen peroxide
No full textIdentifying the charge transfer at metal-semiconductor interfaces by detecting hot electrons is crucial for understanding the mechanism of catalytic reactions and the development of an engineered catalyst structure. Over the last two decades, the development of catalytic nanodiodes has enabled us to directly measure chemically induced hot electron flux and relate it to catalytic activity. A crucial question is the role of interfacial sites at metal-oxide interfaces in determining catalytic activity and hot electron flux. To address this issue, a new design of catalytic nanodiodes employs nanoscale Pt wires and a semiconducting substrate. Here, we fabricated a novel Schottky nanodiode, a platinum nanowire (Pt NW) deposited Si catalytic nanodiode (Pt NW/Si) that exhibits an increased number of metal-semiconductor interfacial sites (Pt/Si) compared with a Pt film-based Si nanodiode (Pt film/Si). Two types of Pt/Si catalytic nanodiodes were utilized to investigate the electronic properties of the Pt/Si interface by detecting hot electrons and observing reactivity during the H2O2 decomposition reaction in the liquid-solid system. We show that the Pt NWs had higher catalytic activity because of the surface defect sites on the Pt NW surface. We observed a higher chemicurrent yield on the Pt NW/Si nanodiode compared with the Pt film/Si nanodiode, which is associated with the shortened travel length for the hot electrons at the edge of the Pt nanowires and results in a higher transmission probability for hot electron transport through metal-oxide interfaces. This journal i11Nsciescopu
Meeting Challenges in Active Learning: Guidelines for Professional Development of a Flipped Classroom Modeljhkim
No full textGeorgia Southern faculty member, Jackie HeeYoung Kim\u27s work was published in the Proceedings of Society for Information Technology & Teacher Education International Conference 2016
iBooks Author: Potential, Pedagogical Meanings, and Implementation Challenges
No full textThis article discusses Apple’s iBooks Author, an application intended for textbook writers and publishers to create e-textbooks. This article provides insight on why IBA will change how we teach and learn as well as IBA’s potential, controversial issues, pedagogical meanings, and implementation challenges of using it as a classroom textbook. The article includes lessons learned from the leading countries in implementing e-textbooks in the classroom, such as South Korea and Malaysia
Apple’s iBooks Author
No full textThis chapter discusses Apple’s iBooks Author, a brand-new Mac application intended for textbook writers and publishers to create e-textbooks. This chapter provides insight on why IBA holds a prominent place in the field of education and will change our classroom landscape, that is, how we teach and learn. The main purpose of this chapter is to explore IBA’s potential, possible controversial issues, pedagogical meanings, and implementation challenges of using it as a classroom textbook. The chapter includes lessons learned from the leading countries in implementing e-textbooks in the classroom, such as South Korea and Malaysia
Surface chemistry of hot electron and metal-oxide interfaces
No full text© 2021 Elsevier B.V.Fundamental mechanisms for energy conversion and dissipation on surfaces and at interfaces have been significant issues in the community of surface science. Electronic excitation in exothermic chemical reactions or photon absorption involves the generation of energetic or hot electrons that are not in thermal equilibrium via non-adiabatic electronic excitation. A number of experimental and theoretical studies have demonstrated the influence of excited hot electrons on atomic and molecular processes, and it is a key moderator in the surface energy conversion process. The charge transfer through the metal-oxide interfaces has a significant impact on catalytic performance in mixed metal-oxide catalysts. In order to understand the influence of hot electrons and metal-oxide interfaces on the surface reactions, various detection schemes of exoelectron detection, including metal-insulator-metal and metal-semiconductor Schottky diodes, have been developed. Catalysts coupled with surface plasmons exhibit peculiar catalytic performance related to hot electron flow. In this review, we outline recent research efforts to relate hot electron flow with surface reactions occurring at metal-oxide interfaces. We report recent studies on the observation of hot electrons and the correlation between hot electrons and catalytic activity and selectivity on metallic surfaces. We show recent results from studies of surface reactions on nanocatalysts coupled with surface plasmons, where hot electron transport is the key process in energy dissipation and conversion processes.11Nsciescopu
Trioctylphosphine Oxide (TOPO)-Assisted Facile Fabrication of Phosphorus-Incorporated Nanostructured Carbon Nitride Toward Photoelectrochemical Water Splitting with Enhanced Activity
No full textDesigning nanostructured arrays of two-dimensional surfaces and interfaces is a versatile approach to increasing their photoelectrochemical activity. Here, phosphorus (P)-incorporated nanostructured carbon nitride (h-PCN) with an enlarged surface area is fabricated by employing trioctylphosphine oxide (TOPO) as a dopant precursor for visible-light-driven photoelectrochemical water splitting to produce hydrogen. The structural, morphological, and electronic properties of the photocatalyst have been characterized through various physicochemical techniques. We show that the incorporation of P into the g-C3N4 framework enhances light absorption over broad regimes, charge separation, and migration, as well as the specific surface area, showing excellent photocurrent enhancement (5.4 folds) in the cathodic direction as compared to bulk g-C3N4. Moreover, the photocathode shows 3.3-fold enhancement in current at zero biased potential. Without using any cocatalyst, the photoelectrodes produced 27 mu mol h(-1) of H-2 and 13 mu mol h(-1) of O-2 with 95% faradic efficiency. The excellent photoelectrochemical behavior toward water-splitting reactions by the photoelectrode is attributed to the synergistic effect of P incorporation and active sites emerging from the nanostructured architecture of the material. This work demonstrates the facile fabrication of nanostructured P-incorporated g-C3N4 toward water-splitting reactions to produce hydrogen without using a cocatalyst in a simple and cost-effective way.11Nsciescopu
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