5 research outputs found
Nitrogen-Doped Carbon Nanotube/Graphite Felts as Advanced Electrode Materials for Vanadium Redox Flow Batteries
Nitrogen-doped carbon nanotubes have been grown, for
the first
time, on graphite felt (N-CNT/GF) by a chemical vapor deposition approach
and examined as an advanced electrode for vanadium redox flow batteries
(VRFBs). The unique porous structure and nitrogen doping of N-CNT/GF
with increased surface area enhances the battery performance significantly.
The enriched porous structure of N-CNTs on graphite felt could potentially
facilitate the diffusion of electrolyte, while the N-doping could
significantly contribute to the enhanced electrode performance. Specifically,
the N-doping (i) modifies the electronic properties of CNT and thereby
alters the chemisorption characteristics of the vanadium ions, (ii)
generates defect sites that are electrochemically more active, (iii)
increases the oxygen species on CNT surface, which is a key factor
influencing the VRFB performance, and (iv) makes the N-CNT electrochemically
more accessible than the CNT
Hydrothermal Synthesis of Boron and Nitrogen Codoped Hollow Graphene Microspheres with Enhanced Electrocatalytic Activity for Oxygen Reduction Reaction
Boron
and nitrogen codoped hollow graphene microspheres (NBGHSs), synthesized
from a simple template sacrificing method, have been employed as an
electrocatalyst for the oxygen reduction reaction (ORR). Because of
their specific hollow structure that consists of boron and nitrogen
codoped graphene, the NBGHSs can exhibit even high electrocatalytic
activity toward ORR than the commercial JM Pt/C 40 wt %. This, along
with their higher stability, makes the NBGHSs particularly attractive
as the electrocatalyst for the ORR with great potential to replace
the commonly used noble-metal-based catalysts
Robust Metal–Organic Framework Containing Benzoselenadiazole for Highly Efficient Aerobic Cross-dehydrogenative Coupling Reactions under Visible Light
A zirconiumÂ(IV)-based
UiO-topological metal–organic framework (UiO-68Se) containing
benzoselenadiazole was synthesized by an approach of the mixed dicarboxylate
struts, which show highly efficient and recycalable photocatalytic
activity for aerobic cross-dehydrogenative coupling reactions between
tertiary amines and various carbon nucleophiles under visible-light
irradiation
Ratiometric Luminescent Detection of Organic Amines Due to the Induced Lactam–Lactim Tautomerization of Organic Linker in a Metal–Organic Framework
Here we demonstrate
that a fluorescent benzothiadiazole (BTD)-conjugated terphenyldicarboxylate
(TPDC) linker (denoted as H<sub>2</sub>-ostpdc) has been hybridized
by a quinoxaline-2,3-(1<i>H</i>,4<i>H</i>)-dione
(QD) moiety possessing lactam-lactim tautomerism, which was further
integrated into a robust and porous UiO-68 type zirconium metal–organic
framework (MOF UiO-68-osdm) by utilizing the mixed two dicarboxylate
struts with the same ligand lengths. The resultant MOF UiO-68-osdm
can work as a ratiometric luminescent sensor for visual and selective
detection of alkyl amines. Furthermore, it can discriminate secondary
alkylamines from other type amine species
Highly Efficient and Selective Photooxidation of Sulfur Mustard Simulant by a Triazolobenzothiadiazole-Moiety-Functionalized Metal–Organic Framework in Air
A photoactive triazolobenzothiadiazole
(TBTD)-conjugated terphenyldicarboxylate (TPDC) linker was introduced
into a porous and robust UiO-68 isoreticular zirconium metal–organic
framework (denoted as UiO-68-TBTD) by the de novo synthetic approach
of mixed TPDC struts. Under blue-light-emitting-diode irradiation,
UiO-68-TBTD can serve as a heterogeneous photocatalyst for the highly
efficient and selective oxidation of a sulfur mustard simulant (2-chloroethyl
ethyl sulfide) to the corresponding much less toxic sulfoxide product,
with a half-life of only 3 min in the open air atmosphere