40 research outputs found
PESI - a taxonomic backbone for Europe
No full textThis is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The attached file is the published version of the article.NHM Repositor
Ultrasensitive and bifunctional ZnO nanoplates for an oxidative electrochemical and chemical sensor of NO<sub>2</sub>: implications towards environmental monitoring of the nitrite reaction
No full textHerein, we focused on the one pot synthesis of ZnO nanoplates (NP edge thickness of ∼100 nm) using a chemical emulsion approach for chemical (direct) and electrochemical (indirect) determination of NO2. </p
REPORT ON BEST PRACTICES FOR CITABILITY OF DATA AND ON EVOLVING ROLES IN SCHOLARLY COMMUNICATION
No full textThis report sets out the current thinking on data citation best practice and presents the results of a survey of librarians asking how new support roles could and should be developed
TiO2 nanotubes decorated by silver nanocubes: Extraction of high field emission current density
No full text
Enhanced Hydrazine Oxidation on Histidine-Functionalized Graphene-Based Electrocatalysts
No full textOne
of the most essential processes in industrial and other potential
energy applications is the electrochemical hydrazine oxidation reaction
(HzOR). With an onset potential of 0.75 V versus reversible hydrogen
electrode (RHE), the electrochemical HzOR performance of histidine-functionalized
graphene oxide (Hist@rGO) is substantially enhanced with an achieved
higher current of 24 mA/cm2 at 1.95 V versus RHE in 0.5
M KOH. Hist@rGO has the highest electrocatalytic performance for hydrazine
oxidation processes according to electrochemical measurements. Moreover,
the Hist@rGO-supported material performs admirably that may be attributed
to its synergistic catalytic activity. The presence of an imidazole
ring containing heteroatoms on the top of GO boosts the electrocatalytic
activity and electron-transfer capacities toward the HzOR, resulting
in outstanding electrochemical HzOR performance for the Hist@rGO electrocatalyst.
The size of Hist@rGO is confirmed by morphological studies using high-resolution
transmission electron microscopy. From the binding energies of C–N,
C–O, and C–C signals, X-ray photoelectron spectroscopy
validates the surface modification of GO by histidine (Hist@rGO).
According to our data, the metal-free amino acid-functionalized carbon-based
electrocatalyst has an excellent electrochemical HzOR performance
and plays an important role in activity
l‑Lysine-Functionalized Reduced Graphene Oxide as a Highly Efficient Electrocatalyst for Enhanced Oxygen Evolution Reaction
No full textAs
functional molecules, amino acids have attracted great attention
in the field of material sciences due to their interactive sites.
New studies have shown the electrocatalytic activity capability of
amino-acid-functionalized graphene oxide (GO) toward the oxygen evolution
reaction (OER). The improved active sites and further tunable and
huge surface area after l-lysine functionalization on reduced
graphene oxide (Ly-rGO) offer significant opportunities for further
enhancement in the OER activity. Herein, the functionalization of
GO with terminal nitrogen-containing groups (l-lysine) results
in efficient and stable electrocatalytic activity for OER with a lower
overpotential of 0.33 V at 10 mA cm–2 and a lower
Tafel slope of 80 mV dec–1. Electrochemical impedance
spectroscopic of Ly-rGO also shows a lower Rct = 29.58 Ω and an excellent current stability for 5000
s at an onset potential of 1.29 V vs SCE in 0.5 M KOH. Morphological
studies based on high-resolution transmission electron microscopy
confirm that the size of Ly-rGO is ∼5 nm. X-ray photoelectron
spectroscopic analysis confirms the surface functionalization of GO
by lysine (Ly-rGO) from the binding energies of C–N, C–O,
and C–C. From this perspective, our findings emphasize the
usefulness of metal-free amino-acid-functionalized carbon-based electrocatalysts
for OER, which is an important water-splitting reaction, and demonstrates
that they may be keys toward enhancement in activities
The other side of the social web: A taxonomy for social information access
No full textThe power of the modern Web, which is frequently called the Social Web or Web 2.0, is frequently traced to the power of users as contributors of various kinds of contents through Wikis, blogs, and resource sharing sites. However, the community power impacts not only the production of Web content, but also the access to all kinds of Web content. A number of research groups worldwide explore what we call social information access techniques that help users get to the right information using "collective wisdom" distilled from actions of those who worked with this information earlier. This invited talk offers a brief introduction into this important research stream and reviews recent works on social information access performed at the University of Pittsburgh's PAWS Lab lead by the author. Copyright © 2012 by the Association for Computing Machinery, Inc. (ACM)
