Efficient passivation of monolayer MoS by epitaxially grown 2D organic crystals.

Monolayer molybdenum disulfide (MoS) is considered to be a promising candidate for field-effect transistors and photodetectors due to its direct bandgap and atomically thin properties. However, the MoS devices are impeded by the intrinsic surface defects and environmental adsorption such as HO and O. Here, we demonstrated a highly ordered, ultrathin (<5 nm) and scalable N,N'-ditridecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C13) passivation layer that can be epitaxially grown on MoS.

Modulation of the secondary Bjerknes force in multi-bubble systems.

The behaviours of insonated bubble clusters are regulated by the secondary Bjerknes force between bubble pairs. While the force has been investigated extensively for two-bubble systems, the modulation of the force by nearby bubbles remains unclear. This problem is investigated in this paper by theoretical analyses and numerical simulations of a three bubble system.

Cl/SO-Codoped Poly(3,4-ethylenedioxythiophene) That Interpenetrates and Encapsulates Porous FeO To Form Composite Nanoframeworks for Stable Lithium-Ion Batteries.

Penetrating into the inner surface of porous metal-oxide nanostructures to encapsulate the conductive layer is an efficient but challenging route to exploit high-performance lithium-ion battery electrodes. Furthermore, if the bonding force on the interface between the core and shell was enhanced, the structure and cyclic performance of the electrodes will be greatly improved. Here, vertically aligned interpenetrating encapsulation composite nanoframeworks were assembled from Cl/SO-codoped poly(3,4-ethylenedioxythiophene) (PEDOT) that interpenetrated and coated on porous FeO nanoframeworks (PEDOT-IE-FeO) via a one-step Fe-induced in situ growth strategy.

Ceria/cobalt borate hybrids as efficient electrocatalysts for water oxidation under neutral conditions.

Oxygen evolution reaction (OER) catalysts are of importance for electrochemical water splitting and fuel generation. Despite enormous efforts, the design and development of OER catalysts with high catalytic activities under neutral conditions are highly desired but still remain a great challenge. Herein, we report a room temperature chemical route to prepare ceria/cobalt borate (CeO/Co-Bi) hybrids as efficient OER catalysts by tuning the molar ratio of Ce/Co ( represents the amount of CeO).

Study of perovskite solar cells based on mixed-organic-cation FAMAPbI absorption layer.

Mixed-organic-cation FAxMA1-xPbI3 films were prepared using a one-step solution deposition method in ambient air. The formamidinium (FA+) fraction 'x' was varied from 0.1 to 1 by changing the amounts of formamidinium iodide (FAI) and methylammonium iodide (MAI) in the precursor solution.

Synthesis of a MoS -O-PtO Electrocatalyst with High Hydrogen Evolution Activity Using a Sacrificial Counter-Electrode.

Water splitting is considered to be a very promising alternative to greenly produce hydrogen, and the key to optimizing this process is the development of suitable electrocatalysts. Here, a sacrificial-counter-electrode method to synthesize a MoS /carbon nanotubes/Pt catalyst (0.55 wt% Pt loading) is developed, which exhibits a low overpotential of 25 mV at a current density of 10 mA cm, a low Tafel slope of 27 mV dec, and excellent stability under acidic conditions.

The secondary Bjerknes force between two oscillating bubbles in Kelvin-Voigt-type viscoelastic fluids driven by harmonic ultrasonic pressure.

The interaction between two small bubbles experiencing transient cavitation in a nonlinear Kelvin-Voigt fluid is investigated. The time-delay effect in the interaction is incorporated in the coupled Keller-Miksis model. The refined model predicts that bubbles with radii smaller than 2μm will be repelled by large bubbles, in contrast to predictions from previous models.

Highly Compressible Cross-Linked Polyacrylamide Hydrogel-Enabled Compressible Zn-MnO Battery and a Flexible Battery-Sensor System.

The fast advancement in flexible and wearable electronics has put up with new requirements on the energy storage device with improved tolerance to deformation apart from offering power output. Despite the tremendous progress in stretchable energy storage devices, the compressional energy storage devices have indeed received limited research attention. In this work, an intrinsically compressible rechargeable battery was proposed using the Zn-MnO chemistry and a cross-linked polyacrylamide hydrogel electrolyte.

3D CNTs/Graphene-S-AlNi Cathodes for High-Sulfur-Loading and Long-Life Lithium-Sulfur Batteries.

Lithium-sulfur batteries suffer from poor cycling stability at high areal sulfur loadings (ASLs) mainly because of the infamous shuttle problem and the increasing diffusion distance for ions to diffuse along the vertical direction of the cathode plane. Here, a carbon nanotube (CNT)/graphene (Gra)-S-AlNi cathode with 3D network structure is designed and prepared. The 3D network configuration and the Al in the AlNi provide an efficient channel for fast electron and ion transfer in the three dimensions, especially along the vertical direction of the cathode.

Controllable Synthesis of Tunable Microstructures of Self-Supporting Graphene Films from Opened Bubble to Cube via in Situ Template-Modulating.

Three-dimensional (3D) microstructured building units have replaced layer-to-layer stacked designs in transparent graphene films to fully exploit the advantages of two-dimensional graphene. However, it is still challenging to precisely control the size and microstructures of these building blocks to develop multifunctional graphene-based materials that satisfy the performance requirements of diverse applications. In this study, we propose a controllable method to regulate the microstructures of building units to form structures ranging from opened bubbles and cubes, while the size decreased from 20 to 3 μm, via an in situ template-modulating technology.

Recent Progress on Flexible and Wearable Supercapacitors.

Recently, wearable electronic devices including electrical sensors, flexible displays, and health monitors have received considerable attention and experienced rapid progress. Wearable supercapacitors attract tremendous attention mainly due to their high stability, low cost, fast charging/discharging, and high efficiency; properties that render them value for developing fully flexible devices. In this Concept, the recent achievements and advances made in flexible and wearable supercapacitors are presented, especially highlighting the promising performances of yarn/fiber-shaped and planar supercapacitors.

Transparent and Self-Supporting Graphene Films with Wrinkled- Graphene-Wall-Assembled Opening Polyhedron Building Blocks for High Performance Flexible/Transparent Supercapacitors.

Improving mass loading while maintaining high transparency and large surface area in one self-supporting graphene film is still a challenge. Unfortunately, all of these factors are absolutely essential for enhancing the energy storage performance of transparent supercapacitors for practical applications. To solve the above bottleneck problem, we produce a novel self-supporting flexible and transparent graphene film (STF-GF) with wrinkled-wall-assembled opened-hollow polyhedron building units.

Symmetric transparent and flexible supercapacitor based on bio-inspired graphene-wrapped FeO nanowire networks.

Transition metal oxides with high specific capacitance materials are ideal for a new generation of high-performance transparent supercapacitors but are rarely reported. Commonly, the synthesis of the required nanostructured materials is a crucial step required to achieve the transparency of the device. In this study, a FeO nanowire network transparent film is developed simply through air-solution interface reactions and wrapped in graphene shells for use as transparent electrodes.