Earth-abundant magnetite with carbon coatings as reversible cathodes for stretchable zinc-ion batteries

Earth-abundant magnetite(Fe_(3)O_(4))as cathode materials in aqueous zinc-ion batteries(ZIBs)is limited by its very low capacity and poor cycling.Here,a combined strategy based on carbon coating and electrolyte optimization is adopted to improve the performance of Fe_(3)O_(4).The Zn-Fe_(3)O_(4)@C batteries display specific capacities of 93 mAh g^(−1) and 81%capacity retention after 200 cycles.Such performance is attributed to the enhanced electrical conductivity and structural stability of Fe_(3)O_(4)@C nanocomposites with suppressed iron dissolution.Experimental analysis reveals that the charge storage is contributed by diffusion-limited redox reactions and surface-controlled pseudocapacitance.A stretchable Zn-Fe_(3)O_(4)@C battery is further fabricated,showing stable performance when it is bent or stretched.Fe_(3)O_(4) is a promising cathode material for cost-effective,safe,sustainable and wearable energy supplies.

Electrostatically connected nanoarchitected electrocatalytic films for boosted water splitting

Active sites of two-dimensional(2D)electrocatalysts are often partially blocked owing to their inevitable stacking and hydrophobic polymeric binders in macroscale electrodes,therefore impeding their applications in efficient electrolyzers.Here,using layered double hydroxide(LDH)nanosheets as a model 2D electrocatalyst,we demonstrate that their performance toward water splitting can be boosted when they are electrostatically assembled into an organized structure pillared by hydrophilic polyelectrolytes or nanoparticles in a layer-by-layer(LbL)fashion.In particular,their mass activity on a planar electrode can be as large as 2.267 mA·μg^(-1) toward oxygen evolution reaction(OER),when NiFe-LDH nanosheets are electrostatically connected by poly(sodium 4-styrenesulfonate)(PSS),while drop-casted NiFe-LDH nanosheets only have a mass activity of 0.116 mA·μg^(-1).In addition,these homogeneous NiFe-LDH nanofilms can be easily deposited on three-dimensional(3D)surfaces with high areas,such as carbon cloths,to serve as practical electrodes with overpotentials of 328 mV at a current density of 100 mA·cm^(-2),and stability for 40 h.Furthermore,Pt nanoparticles can be LbL assembled with NiFe-LDH as bifunctional electrodes for synergistically boosted oxygen and hydrogen evolution reactions(HER),leading to successful overall water splitting powered by a 1.5 V battery.This study heralds the spatial control of 2D nanomaterials in nanoscale precision as an efficient strategy for the design of advanced electrocatalysts.

Two-step colloidal synthesis of micron-scale Bi_(2)O_(2)Se nanosheets and their electrostatic assembly for thin-film photodetectors with fast response

Recently discovered bismuth oxychalcogenide(Bi_(2) O_(2) Se) has aroused great interest due to its ultrahigh carrier mobility,tunable band gap and good environmental stability,making it a promising candidate for high-performance electronics and optoelectronics.Their synthesis by colloidal approaches represents a cost-effective alternative to well-established chemical vapor deposition methods,and the resulting electronic-grade inks are important for large-area printed or wearable electronics.However,it is still challenging to control the colloidal growth of Bi_(2) O_(2) Se nanosheets in solution in addition to their assembly into high-performance thin films.Here,we report a two-step colloidal synthesis of Bi_(2) O_(2) Se nanosheets by separating the seeding and growth steps,thereby achieving controllable production of nanosheets with a lateral size of 1.4 mm and a thickness of 10 nm at optimized reaction conditions.These Bi_(2) O_(2) Se nanosheets are electrostatically assembled into large-area thin films,from which a photodetector is fabricated with a responsivity of 6.1 A/W and a short response time of 368 ms under the 520-nm laser illumination.The device exhibits fast response to modulations as high as 100 k Hz,along with a à3 dB bandwidth of 1 kHz.This work provides an important understanding of the controlled colloidal synthesis of Bi_(2) O_(2) Se nanosheets,and demonstrates their potential applications in fast photodetectors.

Recent Advances in Rare-Earth Polypnictides

The polypnictide complexes of rare earth cations have drawn the attention of the scientific community for their uncommon bonding modes and potential applications.Herein,we present a systematic and comprehensive summary on recent advances in the field of rare earth polypnictides,focusing on their synthesis,structures,and reactivities.The structural stbilizing effects imposed by the electropositive rare earth cations as well as the reducing capability of rare earth precursors in the synthesis of these polypnictide complexes are described in this review.We also disscuss in detail the bonding interactions and coordination modes between rare earth cations and polypnictide clusters as well as the similarities and the peculiarity of some structures.

High-mobility patternable MoS_(2) percolating nanofilms

Fabrication of large-area and uniform semiconducting thin films of two-dimensional(2D)materials is paramount for the full exploitation of their atomic thicknesses and smooth surfaces in integrated circuits.In addition to elaborate vapor-based synthesis techniques for the wafer-scale growth of 2D films,solution-based approaches for high-quality thin films from the liquid dispersions of 2D flakes,despite underdeveloped,are alternative cost-effective tactics.Here,we present layer-by-layer(LbL)assembly as an effective approach to obtaining scalable semiconducting films of molybdenum disulfide(MoS_(2))for field-effect transistors(FETs).LbL assembly is achieved by coordinating electrochemically exfoliated MoS_(2) with cationic poly(diallyldimethylammonium chloride)(PDDA)through electrostatic interactions.The PDDA/MoS_(2) percolating nanofilms show controlled and self-limited growth on a variety of substrates,and are easily patterned through lift-off processes.Ion gel gated FETs are fabricated on these MoS_(2) nanofilms,and they show mobilities of 9.8 cm^(2)·V^(−1)·s^(−1),on/off ratios of 2.1×10^(5) with operating voltages less than 2 V.The annealing temperature in the fabrication process can be as low as 200℃,thereby permitting the fabrication of flexible FETs on polyethylene terephthalate substrates.The LbL assembly technique holds great promise for the large-scale fabrication of flexible electronics based on solution-processed 2D semiconductors.

基于铜纳米材料及其组装的柔性电子技术（英文）

柔性电子在可穿戴和生物植入等应用中发挥着越来越重要的作用.柔性电子在实现一定电子功能的同时,具备变形成任意形状的能力.该领域在过去的十年里进展显著,在柔性导体、半导体、介电材料的制备中成果颇多.在这些材料中,铜基柔性导体由于其价格低廉,地球储量丰富,光、电、机械性能优异,在柔性、可拉伸电极或者电路互连中有着广阔的应用前景.在这篇综述中,我们总结了这些材料的最新进展,详细讨论了铜纳米材料的合成、组装、抗氧化腐蚀策略以及它们在各个领域的应用(如柔性电极、传感器和其他柔性器件).最后,我们讨论了铜基柔性导体为应对更广泛的应用场景仍需面临的一系列挑战.

高效灭活抗生素抗性基因的机理研究:界面协同吸附与光催化氧化过程

高级氧化法(AOP)已被应用于解决多种环境问题,包括对于抗生素抗性基因(ARGs)的处理. ARGs对人类健康的威胁愈加严重,然而,由于ARGs在环境中以极低浓度存在,且对其界面行为的了解有限,其控制手段受到很大的限制.该研究设计了一种新型AOP催化剂Ag/TiO_(2)/graphene oxide(GO),并与PVDF超滤膜结合,具有界面协同吸附和光催化氧化作用,在模型溶液和二级废水中均能高效灭活ARGs,特别是在残留浓度较低的情况下.进一步分析表明,碱基和磷酸二酯键的矿化是ARGs失活的主要原因.此外,该研究还从分子水平研究了ARGs的界面吸附和光催化氧化.结果表明,GO富含sp^(2)骨架和含氧官能团,通过π-π相互作用和氢键有效地捕获和富集ARGs.因此,光生活性氧物种能够克服动力学问题,更高效地攻击ARGs.通过催化剂与PVDF膜的进一步结合,验证了其在废水处理中的应用潜力.该研究为胞内/胞外ARGs的失活和矿化提供了有效的方法.此外,在分子水平上了解ARGs的固液界面行为,将有助于进一步研究ARGs的控制策略.