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 KPF₆-based electrolyte. The PDIBs delivered a reversible capacity of 60 mA h g^–1 at a median discharge voltage of 3.23 V at 50 mA g^–1, 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 PF₆^– ions interacted with the nitrogen atom reversibly in the PTPAn cathode and the K⁺ 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>-indolo­[2,3-<i>b</i>]­quinolines from mono-<i>N</i>-substituted isoindigo derivatives in the presence of SnCl₂·2H₂O 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⁺ 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⁺ 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^–1 at 1000 mA g^–1 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 Mn₂P₂O₇–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 Mn²⁺ ions to <i>in situ</i> synthesize natural micro-yolk–shell-structure Mn₂P₂O₇–carbon, followed by the use of vacuum filtration to obtain Mn₂P₂O₇–carbon@reduced graphene oxides (RGO) papers for LIBs anodes. The Mn₂P₂O₇ 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 Mn₂P₂O₇ 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