8 research outputs found
An Organic Cathode for Potassium Dual-Ion Full Battery
Potassium-based
dual-ion full batteries (PDIBs) were developed
with graphite anode, polytriphenylamine (PTPAn) cathode, and KPF<sub>6</sub>-based electrolyte. The PDIBs delivered a reversible capacity
of 60 mA h g<sup>–1</sup> at a median discharge
voltage of 3.23 V at 50 mA g<sup>–1</sup>, with superior
rate performance and long-term cycling stability over 500 cycles (capacity
retention of 75.5%). Unlike the traditional dual-ion batteries, the
operation mechanism of the PDIBs with PTPAn cathode is that the PF<sub>6</sub><sup>–</sup> ions interacted with the nitrogen atom
reversibly in the PTPAn cathode and the K<sup>+</sup> ions were intercalated/deintercalated
into/from the graphite anode during the charge/discharge process
Synthesis of 6‑Substituted 6<i>H</i>‑Indolo[2,3‑<i>b</i>]quinolines from Isoindigos
A facile
approach to 6-aryl/alkyl substituted 6<i>H</i>-indoloÂ[2,3-<i>b</i>]Âquinolines from mono-<i>N</i>-substituted isoindigo
derivatives in the presence of SnCl<sub>2</sub>·2H<sub>2</sub>O in acid media is described. Pyrrole and pyridine
rings are synchronously constructed in one pot for these tetracyclic
molecules. A plausible reduction/hydrolysis/decarboxylation/cyclization/aromatization
domino reaction mechanism is proposed. Bis-<i>N</i>-substituted
isoindigo only gives the corresponding reduction product, 3,3′-bioxindole
Additional file 1: of Using eHealth to engage and retain priority populations in the HIV treatment and care cascade in the Asia-Pacific region: a systematic review of literature
Demonstration search strategy for PubMed. (DOC 35 kb
Offset Initial Sodium Loss To Improve Coulombic Efficiency and Stability of Sodium Dual-Ion Batteries
Sodium
dual-ion batteries (NDIBs) are attracting extensive attention recently
because of their low cost and abundant sodium resources. However,
the low capacity of the carbonaceous anode would reduce the energy
density, and the formation of the solid-electrolyte interphase (SEI)
in the anode during the initial cycles will lead to large amount
consumption of Na<sup>+</sup> in the electrolyte, which results in
low Coulombic efficiency and inferior stability of the NDIBs. To address
these issues, a phosphorus-doped soft carbon (P-SC) anode combined
with a presodiation process is developed to enhance the performance
of the NDIBs. The phosphorus atom doping could enhance the electric
conductivity and further improve the sodium storage property. On the
other hand, an SEI could preform in the anode during the presodiation
process; thus the anode has no need to consume large amounts of Na<sup>+</sup> to form the SEI during the cycling of the NDIBs. Consequently,
the NDIBs with P-SC anode after the presodiation process exhibit high
Coulombic efficiency (over 90%) and long cycle stability (81 mA h
g<sup>–1</sup> at 1000 mA g<sup>–1</sup> after 900 cycles
with capacity retention of 81.8%), far more superior to the unsodiated
NDIBs. This work may provide guidance for developing high performance
NDIBs in the future
Bacteria Absorption-Based Mn<sub>2</sub>P<sub>2</sub>O<sub>7</sub>–Carbon@Reduced Graphene Oxides for High-Performance Lithium-Ion Battery Anodes
The development of freestanding flexible
electrodes with high capacity and long cycle-life is a central issue
for lithium-ion batteries (LIBs). Here, we use bacteria absorption
of metallic Mn<sup>2+</sup> ions to <i>in situ</i> synthesize
natural micro-yolk–shell-structure Mn<sub>2</sub>P<sub>2</sub>O<sub>7</sub>–carbon, followed by the use of vacuum filtration
to obtain Mn<sub>2</sub>P<sub>2</sub>O<sub>7</sub>–carbon@reduced
graphene oxides (RGO) papers for LIBs anodes. The Mn<sub>2</sub>P<sub>2</sub>O<sub>7</sub> particles are completely encapsulated within
the carbon film, which was obtained by carbonizing the bacterial wall.
The resulting carbon microstructure reduces the electrode–electrolyte
contact area, yielding high Coulombic efficiency. In addition, the
yolk–shell
structure with its internal void spaces is ideal for sustaining volume
expansion of Mn<sub>2</sub>P<sub>2</sub>O<sub>7</sub> during charge/discharge
processes, and the carbon shells act as an ideal barrier, limiting
most solid–electrolyte interphase formation on the surface
of the carbon films (instead of forming on individual particles).
Notably, the RGO films have high conductivity and robust mechanical
flexibility. As a result of our combined strategies delineated in
this article, our binder-free flexible anodes exhibit high capacities,
long cycle-life, and excellent rate performance
Relationship between sequence types and serotypes of 56 <i>S</i>. <i>agalactiae</i> isolates.
<p>Relationship between sequence types and serotypes of 56 <i>S</i>. <i>agalactiae</i> isolates.</p
Supplemental Material - Effect of Five-Elements Music Therapy Combined With Baduanjin Qigong on Patients With Mild COVID-19
Supplemental Material for Effect of Five-Elements Music Therapy Combined With Baduanjin Qigong on Patients With Mild COVID-19 by Lishi Yin Haijiao Zhang, Yan Peng, Guifang Zhang, Qiyang Chen, Juan Liang, Suzhai Tian, Tingting Tong, Ruiyi Liu, Chenxu Lv, Lijuan Zhao, Ting Liang, Jie Wang and Ling Fan in Journal of Social and Personal Relationships.</p
Distribution of macrolide resistance genes and MICs in erythromycin-resistant <i>S</i>. <i>agalactiae</i> (ERSA).
<p>Distribution of macrolide resistance genes and MICs in erythromycin-resistant <i>S</i>. <i>agalactiae</i> (ERSA).</p