Holey etching strategy of siloxene nanosheets to improve the rate performance of photo-assisted Li-O batteries.

Improving the rate performance is of great significance to achieve high-performance photo-assisted Li-O batteries for developing new optimized bifunctional photocatalysts. Herein, a holey etching strategy is developed to prepare porous siloxene nanosheets with a size of 10 nm and few layers (P-siloxene NSs) by a modified Ag-assisted chemical etching method, and the optimized pore-forming conditions are: Ag ion concentration 0.01 mol dm, HF concentration 0.

Highly capacitive MXene film by incorporating poly(3,4-ethylenedioxythiophene) hollow spheres prepared through an interfacial oxidation polymerization.

Sheets stacking of TiCT MXene dramatically reduces the ion-accessible sites and brings a sluggish reaction kinetics. While introducing transitional metal oxides or polymers in the MXene films could partially alleviate such issue, their enhanced performances are realized at the expense of electrode conductivity or cycling stability. Herein, we report an alternative spacer of conductive poly(3,4-ethylenedioxythiophene) (PEDOT) hollow spheres (HSs) which are fabricated by a facile template-assisted interfacial polymerization.

Highly Reversible and Dendrite-Free Zinc Anodes Enabled by PEDOT Nanowire Interfacial Layers for Aqueous Zinc-Ion Batteries.

The aqueous zinc-ion batteries (ZIBs) have gained increasing attention because of their high specific capacity, low cost, and good safety. However, side reactions, hydrogen evolution reaction, and uncontrolled zinc dendrites accompanying the Zn metal anodes have impeded the applications of ZIBs in grid-scale energy storage. Herein, the poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires as an interfacial layer on the Zn anode (Zn-PEDOT) are reported to address the above issues.

N-Doped TiCT Interfacial Layer Enabling Uniform Zn Deposition along (002) Plane for Stable Aqueous Zinc-Ion Battery.

Aqueous zinc-ion batteries hold great potentials for large-scale grid energy storage. However, the electrode corrosion, hydrogen evolution, and dendrite growth of Zn anode often lead to cell failure. Herein, N groups in TiCT (NMXH) are introduced as interfacial layer through hydrothermal treatment of TiCT with urea.

Pre-Intercalation of TMA Cations in MoS Interlayers for Fast and Stable Zinc Ion Storage.

Applications of aqueous zinc ion batteries (ZIBs) for grid-scale energy storage are hindered by the lacking of stable cathodes with large capacity and fast redox kinetics. Herein, the intercalation of tetramethylammonium (TMA) cations is reported into MoS interlayers to expand its spacing from 0.63 to 1.

Dual-Modified Electrospun Fiber Membrane as Separator with Excellent Safety Performance and High Operating Temperature for Lithium-Ion Batteries.

Polyacrylonitrile/Boric acid/Melamine/the delaminated BN nanosheets electrospun fiber membrane (PBNBN) with excellent mechanical property, high thermal stability, superior flame-retardant performance, and good wettability are fabricated by electrospinning PAN/DMF/HBO/CHN/ the delaminated BN nanosheets (BNNSs) homogeneous viscous suspension and followed by a heating treatment. BNNSs are obtained by delaminating the bulk h-BN in isopropyl alcohol (IPA) with an assistance of Polyvinylpyrrolidone (PVP). Benefiting from the cross-linked pore structure and high-temperature stability of BNNSs, PBNBN electrospun fiber membrane delivers high thermal dimensional stability (almost no size contraction at 200 °C), excellent mechanical property (19.

Wide Temperature All-Solid-State Ti C T Quantum Dots/L-Ti C T Fiber Supercapacitor with High Capacitance and Excellent Flexibility.

Ti C T Quantum dots (QDs)/L-Ti C T fiber electrode (Q M ) with high capacitance and excellent flexibility is prepared by a wet spinning method. The assembled units Ti C T nanosheets (NSs) with large size (denoted as L-Ti C T ) is obtained by natural sedimentation screen raw Ti AlC , etching, and mechanical delamination. The pillar agent Ti C T QDs is fabricated by an ultrasound method.

Size-Controlled Boron-Based Bifunctional Photocathodes for High-Efficiency Photo-Assisted Li-O Batteries.

Photo-assisted Li-O batteries are introduced as a promising strategy for reducing severe overpotential by directly employing photocathodes. Herein, a series of size-controlled single-element boron photocatalysts are prepared by the meticulous liquid phase thinning methods by combining probe and water bath sonication, and their bifunctional photocathodes in the photo-assisted Li-O batteries are systematically investigated. The boron-based Li-O batteries have shown incremental round-trip efficiencies as the sized reduction of boron under illumination.

All-solid-state TiCT neutral symmetric fiber supercapacitors with high energy density and wide temperature range.

All-solid-state TiCT neutral symmetric fiber supercapacitors (PVA EGHG TiCT FSCs) with high energy density and wide temperature range are constructed by using polyvinyl alcohol (PVA)-ethylene glycol hydrogel (EGHG)-sodium perchlorate (NaClO) as electrolyte and separator, and TiCT fiber as electrodes. TiCT fiber is prepared using 130 mg mL TiCT nanosheet ink as an assembly unit in a coagulation bath of isopropyl alcohol (IPA) and distilled water with 5 wt% CaCl by a wet spinning method. The prepared TiCT fiber exhibits a specific capacity of 385 F cm and a capacitance retention of 94 % after 10,000 cycles in 1 M NaClO electrolyte.

Interfacial Designs of MXenes for Mild Aqueous Zinc-Ion Storage.

Limited Li resources, high cost, and safety risks of using organic electrolytes have stimulated a strong motivation to develop non-Li aqueous batteries. Aqueous Zn-ion storage (ZIS) devices offer low-cost and high-safety solutions. However, their practical applications are at the moment restricted by their short cycle life arising mainly from irreversible electrochemical side reactions and processes at the interfaces.

Single-crystalline Mg-substituted NaMn(PO)PO nanoparticles as a high capacity and superior cycling cathode for sodium-ion batteries.

Mn-based mixed phosphate NaMn(PO)(PO) (NMPP) is a promising cathode for high-potential, low-cost and eco-friendly sodium-ion batteries. However, this material still faces some bottleneck issues in terms of low conductivity, disturbance of impure crystalline phase, micron-sized agglomerated particles and the Mn Jahn-Teller effect. Herein, a Mg-substituted NMPP (NMMgPP)@C composite was constructed modified solution combustion and subsequent calcination treatment.

Bifunctional Photoassisted Li-O Battery with Ultrahigh Rate-Cycling Performance Based on Siloxene Size Regulation.

Directly integrating the bifunctional photoelectrode into Li-O batteries has been considered an effective way to reduce the overpotential and promote electric energy saving. However, more regular investigations on various bifunctional photocatalysts have still been desired for high-performance photoassisted Li-O batteries. Herein, a systematic exploration of various-sized siloxene photocatalysts affected by Li-O batteries has been introduced.

Thickness-Independent Capacitive Performance of Holey Ti C T Film Prepared through a Mild Oxidation Strategy.

The Ti C T film with metallic conductivity and high pseudo-capacitance holds profound promise in flexible high-rate supercapacitors. However, the restacking of Ti C T sheets hinders ion access to thick film electrodes. Herein, a mild yet green route has been developed to partially oxidize Ti C T to TiO /Ti C T by introducing O  molecules during refluxing the Ti C T suspension.

Synergy Effect of High-Stability of VS Nanorods for Sodium Ion Battery.

Sodium-ion batteries (SIBs) have attracted increasing interest as promising candidates for large-scale energy storage due to their low cost, natural abundance and similar chemical intercalation mechanism with lithium-ion batteries. However, achieving superior rate capability and long-life for SIBs remains a major challenge owing to the limitation of favorable anode materials selection. Herein, an elegant one-step solvothermal method was used to synthesize VS nanorods and VS nanorods/reduced graphene oxide (RGO) nanocomposites.

Direct growth of SnS nanowall photoanode for high responsivity self-powered photodetectors.

Tin sulfide (SnS) has attracted growing attention due to its environmental friendliness, tunable band gap and potential applications for high-sensitivity photodetectors. However, the low responsivity and slow response speed severely hinder its further applications. In this work, SnS nanowalls have been successfully fabricated on FTO substrates by a facile hydrothermal approach.

Few-layer Mg-deficient borophene nanosheets: I oxidation and ultrasonic delamination from MgB.

By using I as an oxidant and CHCN as a reaction medium, few-layer Mg-deficient borophene nanosheets (FBN) with a stoichiometric ratio of MgB are prepared by oxidizing MgB in a mixture of CHCN and HCl for 14 days under nitrogen protection and followed by ultrasonic delaminating in CHCN for 2 h. The prepared FBN possess a two-dimensional flake morphology, and they show a clear interference fringe with a -spacing of 0.251 nm corresponding to the (208) plane of rhombohedral boron.

Ultrahigh-energy sodium ion capacitors enabled by the enhanced intercalation pseudocapacitance of self-standing TiNbO/CNF anodes.

In order to increase the capacity and improve the sluggish Na-reaction kinetics of anodes as sodium ion capacitors (SICs), a TiNbO/CNF self-standing film electrode comprised of TiNbO nanosheets and carbon nanofibers has been fabricated electrospinning HTiNbO nanosheets with PAN and subsequent carbonization treatment. The as-prepared TiNbO/CNF film electrode possesses fast Na-ion intercalation kinetics and high conductivity during Na-ion storage, and it displays a high reversible capacity of 324 mA h g at 0.1 A g.

Ultra-Large Sized Siloxene Nanosheets as Bifunctional Photocatalyst for a Li-O Battery with Superior Round-Trip Efficiency and Extra-Long Durability.

Developing new optimized bifunctional photocatalyst is of great significant for achieving the high-performance photo-assisted Li-O batteries. Herein, a novel bifunctional photo-assisted Li-O system is constructed by using siloxene nanosheets with ultra-large size and few-layers due to its superior light harvesting, semiconductor characteristic, and low recombination rate. An ultra-low charge potential of 1.

A Queue-Ordered Layered Mn-Based Oxides with Al Substitution as High-Rate and High-Stabilized Cathode for Sodium-Ion Batteries.

Development of highly stabilized and reversible cathode materials has become a great challenge for sodium-ion batteries. O'3-type layered Mn-based oxides have deserved much attention as one of largely reversible-capacity cathodes featured by the resource-rich and low-toxic elements. However, the fragile slabs structure of typical layered oxides, low Mn-ion migration barriers, and Jahn-Teller distortion of Mn have easily resulted in the severe degradation of cyclability and rate performances.

2D Re-Based Transition Metal Chalcogenides: Progress, Challenges, and Opportunities.

The rise of 2D transition-metal dichalcogenides (TMDs) materials has enormous implications for the scientific community and beyond. Among TMDs, ReX (X = S, Se) has attracted significant interest regarding its unusual 1T' structure and extraordinary properties in various fields during the past 7 years. For instance, ReX possesses large bandgaps (ReSe: 1.

MoS nanosheets grown on hollow carbon spheres as a strong polysulfide anchor for high performance lithium sulfur batteries.

Lithium sulfur batteries are expected to be one of the most promising energy storage systems due to their high energy density, low cost and environmental friendliness. However, the shuttle effect of lithium polysulfides severely hampers their practical application. The design of the sulfur cathode is one of the most important approaches to overcome the problem.

Few-layer and large flake size borophene: preparation with solvothermal-assisted liquid phase exfoliation.

The preparation of two-dimensional boron (B) nanosheets, especially for borophene, is still a challenge because of its unique structure and complex B-B bonds in bulk boron. In the present work, a novel preparation technology for borophene with only a few layers and large flake sizes is developed by a solvothermal-assisted liquid phase exfoliation process, consisting of ball milling-thinning, solvothermal swelling, and probe ultrasonic delamination. The exfoliation effect of the bulk B precursors is related to the surface tension and Hildebrand parameter of the selected solvents such as acetone, ,-dimethyl formamide (DMF), acetonitrile, ethanol, and -methyl pyrrolidone (NMP), and a relative small surface tension when using solvents is favorable for the exfoliation of bulk B.

Synthesis of TiO/TiO Dual-Phase Nanofibers with Coherent Interface for Oxygen Reduction Reaction Electrocatalysts.

Electrocatalysts play an important role in oxygen reduction reaction (ORR) in promoting the reaction process. Although commercial Pt/C exhibits excellent performance in ORR, the low duration, high cost, and poor methanol tolerance seriously restrict its sustainable development and application. TiO (3 ≤ ≤ 10) is a series of titanium sub-oxide materials with excellent electrical conductivity, electrochemical activity, and stability, which have been widely applied in the field of energy storage and catalysis.

Electrospun NbO nanorods/microporous multichannel carbon nanofiber film anode for Na ion capacitors with good performance.

For the disadvantages of both the slow reaction kinetics and the poor conductivity for NbO electrode materials as sodium-ion capacitors (SICs), NbO NRs/NMMCNF film electrode with good flexibility and high electrochemical property has been fabricated by electrospinning PAN/PMMA/HNbO·HO homogeneous viscous suspension and followed by an annealing treatment, in which the precursor HNbO·HO nanorods are obtained by grinding HNbO·HO nanowires, and NbO nanorods are uniformly embedded in nitrogen doped microporous multichannel carbon nanofiber. Benefiting from the multichannel network structure, NbO NRs/NMMCNF film electrode delivers the fast kinetics of Na-storage and the superior Na-ion storage performance, it delivers outstanding rate capability (101 mAh g at 4 A g) and ultralong lifespan (91% capacity retention after 10,000 cycles at 2 A g). A NbO NRs/NMMCNF//AC SIC based on the NbO NRs@NMMCNF fiber film anode and the AC cathode is assembled.

TiCT Nanosheets/TiCT Quantum Dots/RGO (Reduced Graphene Oxide) Fibers for an All-Solid-State Asymmetric Supercapacitor with High Volume Energy Density and Good Flexibility.

By using TiCT quantum dots as interlayer spacers, TiCT nanosheets/TiCT quantum dots/RGO (reduced graphene oxide) fiber (MMRG) is prepared by a wet-spinning method; it shows good capacitance and excellent flexibility. The MMRG fiber electrode possesses a novel network structure and a maximum volumetric capacitance of 542 F cm, and its capacitance and flexibility are affected by the amount of TiCT quantum dots. Also, the TiCT/PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)] fiber (MP) is prepared by injecting a homogeneous suspension of TiCT nanosheets and PEDOT:PSS into a bath of 98 wt % HSO.