LiMn₂O₄ Nanotube as Cathode Material of Second-Level Charge Capability for Aqueous Rechargeable Batteries

LiMn₂O₄ nanotube with a preferred orientation of (400) planes is prepared by using multiwall carbon nanotubes as a sacrificial template. Because of the nanostructure and preferred orientation, it shows a superfast second-level charge capability as a cathode for aqueous rechargeable lithium battery. At the charging rate of 600C (6 s), 53.9% capacity could be obtained. Its reversible capacity can be 110 mAh/g, and it also presents excellent cycling behavior due to the porous tube structure to buffer the strain and stress from Jahn–Teller effects

Aqueous Rechargeable Zinc/Aluminum Ion Battery with Good Cycling Performance

Developing rechargeable batteries with low cost is critically needed for the application in large-scale stationary energy storage systems. Here, an aqueous rechargeable zinc//aluminum ion battery is reported on the basis of zinc as the negative electrode and ultrathin graphite nanosheets as the positive electrode in an aqueous Al₂(SO₄)₃/Zn­(CHCOO)₂ electrolyte. The positive electrode material was prepared through a simple electrochemically expanded method in aqueous solution. The cost for the aqueous electrolyte together with the Zn negative electrode is low, and their raw materials are abundant. The average working voltage of this aqueous rechargeable battery is 1.0 V, which is higher than those of most rechargeable Al ion batteries in an ionic liquid electrolyte. It could also be rapidly charged within 2 min while maintaining a high capacity. Moreover, its cycling behavior is also very good, with capacity retention of nearly 94% after 200 cycles

Successfully Engineering a Bacterial Sialyltransferase for Regioselective α2,6-sialylation

A β-galactoside α2,6-sialyltransferase from <i>Photobacterium damselae</i> (Pd2,6ST) that is capable of sialylating both terminal and internal galactose and <i>N</i>-acetylgalactosamine was herein redesigned for regioselectively producing terminal α2,6-sialosides. Guided by a recently developed bump-hole strategy, a series of mutations at Ala200 and Ser232 sites were created for reshaping the acceptor binding pocket. Finally, a Pd2,6ST double mutant A200Y/S232Y with an altered L-shaped acceptor binding pocket was identified to be a superior α2,6-sialyltransferase which can efficiently catalyze the regioselective α2,6-sialylation of galactose or <i>N</i>-acetylgalactosamine at the nonreducing end of a series of glycans. Meanwhile, A200Y/S232Y remains flexible donor substrate specificity and is able to transfer Neu5Ac, Neu5Gc, and KDN

Donor–Acceptor Conjugated Polymers for Single-Component Near-Infrared II Organic Phototransistors with Ultrahigh Photoresponsivity

The design of donor–acceptor (D–A) conjugated polymers with narrow bandgaps remains a big challenge for achieving high-performance near-infrared (NIR) phototransistors. Herein, we report a novel D–A conjugated polymer (denoted as TBOPV-DT) based on a thiophene-fused benzodifurandione-based oligo(p-phenylenevinylene) (TBOPV) acceptor in conjugation with a 3,3′-dialkoxy-2,2′-dithiophene (DT) donor. Benefiting from the alkoxylation of the donor units, the TBOPV-DT conjugated polymer exhibits broad second NIR absorption and a narrow bandgap of 0.65 eV. When being used as the channel material in field-effect transistors, the TBOPV-DT conjugated polymer shows p-type semiconducting behavior with a hole mobility of 0.16 cm2 V–1 s–1. Besides, the resulting single-component polymer phototransistor displays ultrahigh sensitivity to a broad range of wavelengths (850–1450 nm) and a record-high photoresponsivity of 1.9 × 105 A W–1. Moreover, the fast rise and decay response times of 53 and 317 ms, respectively, are comparable to those of state-of-the-art two-dimensional materials. This work sheds light on designing new narrow-bandgap D–A conjugated polymers with molecular precision and paves the way for the development of future high-performance optoelectronics

Persulfurated Coronene: A New Generation of “Sulflower”

We report the first synthesis of a persulfurated polycyclic aromatic hydrocarbon (PAH) as a next-generation “sulflower.” In this novel PAH, disulfide units establish an all-sulfur periphery around a coronene core. The structure, electronic properties, and redox behavior were investigated by microscopic, spectroscopic and electrochemical methods and supported by density functional theory. The sulfur-rich character of persulfurated coronene renders it a promising cathode material for lithium–sulfur batteries, displaying a high capacity of 520 mAh g^–1 after 120 cycles at 0.6 C with a high-capacity retention of 90%

Behaviors and life events of Uyghur elderly (60 or older) in Xinjiang Uyghur Autonomous Region, China (N = 1329), 2011.

<p>Behaviors and life events of Uyghur elderly (60 or older) in Xinjiang Uyghur Autonomous Region, China (N = 1329), 2011.</p

Sociodemographic characteristics and prevalence of diseases among Uyghur elderly (60 or older) in Xinjiang Uyghur Autonomous Region, China (N = 1329), 2011.

<p>Sociodemographic characteristics and prevalence of diseases among Uyghur elderly (60 or older) in Xinjiang Uyghur Autonomous Region, China (N = 1329), 2011.</p

Behaviors, life events and satisfaction levels among recruited Uyghur elderly of Xinjiang, China (N = 1329).

<p>Behaviors, life events and satisfaction levels among recruited Uyghur elderly of Xinjiang, China (N = 1329).</p

Flow Chart of the recruitment of the elderly Uyghur in Xinjiang Uyghur Autonomous Religion, China (N = 1329), 2011.

<p>Flow Chart of the recruitment of the elderly Uyghur in Xinjiang Uyghur Autonomous Religion, China (N = 1329), 2011.</p

Disparity of geriatric depression between urban and rural Uyghur elderly in Xinjiang, China (N = 1329).

<p>Disparity of geriatric depression between urban and rural Uyghur elderly in Xinjiang, China (N = 1329).</p