Lithium-ion hybrid supercapacitors (LIHSs), also called Li-ion capacitors, have attracted much attention due to the combination of rapid charge-discharge and long cycle life high energy-storage capacity lithium-ion batteries. Thus, LIHSs are expected become ultimate power source for all-electric vehicles in near future. As an electrode material, graphene has many advantages, including surface area porous structure, electric conductivity, chemical thermal stability, etc. Compared with other...

Solvated reduced graphene oxide (S-rGO) membranes are stable in organic solvents, and strong acidic, alkaline, or oxidative media. They show high rejections to small molecules with charges the same as that of S-rGO coatings neutral larger than 3.4 nm, while retaining their permeances solvents. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be re-organized for online delivery, but not copy-edited typeset....

A poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) hydrogel is prepared by thermal treatment of a commercial PEDOT:PSS (PH1000) suspension in 0.1 mol L-1 sulfuric acid followed partially removing its PSS component with concentrated acid. This has low solid content 4% (by weight) and an extremely high conductivity 880 S m-1 . It can be fabricated into different shapes such as films, fibers, columns arbitrary sizes for practical applications. highly conductive mechanically...

Reducing the energy consumption of a hydrogen evolution reaction (HER) at platinum (Pt) electrode is important for economy. Herein, we report loading alpha- or beta-nickel hydroxide (α- β-Ni(OH)2) nanostructures on surface Pt to improve its catalytic activity and stability HER in alkaline electrolytes. Both experimental theoretical studies reveal that β-Ni(OH)2 better co-catalyst than α-Ni(OH)2 promoting HER, attributed higher water dissociation ability β-Ni(OH)2, as well stronger...

Ni–Fe layered double hydroxide nanoplates loaded on a three-dimensional electrochemically reduced graphene oxide electrode for efficient water oxidation, exhibiting higher activity, kinetics, and stability than those of the IrO₂catalyst.

Barium titanate-based energy-storage dielectric ceramics have attracted great attention due to their environmental friendliness and outstanding ferroelectric properties. Here, we demonstrate that a recoverable energy density of 2.51 J cm-3 giant efficiency 86.89% can be simultaneously achieved in 0.92BaTiO3-0.08K0.73Bi0.09NbO3 ceramics. In addition, excellent thermal stability (25-100 °C) superior frequency (1-100 Hz) been obtained under 180 kV cm-1. The first-order reversal curve method...

Water-enhanced oxidation of graphite <italic>via</italic> a modified Hummers method can produce graphene oxide with controlled species oxygenated groups.

A Janus-interface solar-steam generator is developed for high-efficiency water collection, which circumvents the strong mutual interference between incident light and escaped vapor.

MXenes, a family of two-dimensional (2D) transition-metal carbide and nitride materials, are supposed to be promising pseudocapacitive materials because their high electronic conductivity hydrophilic surfaces. prepared by removing the "A" elements corresponding MAX phases hydrofluoric acid (HF) or LiF–HCl etching, possess abundant terminal groups like −F, −OH, −O groups. It has been proven that MXenes with fewer −F more showed higher pseudocapacitor performance. In organic reactions, −OH −X...

The true promise of MXene as a practical supercapacitor electrode hinges on the simultaneous advancement its three-dimensional (3D) assembly and engineering nanoscopic architecture, two critical factors for facilitating mass transport enhancing an electrode's charge-storage performance. Herein, we present straightforward strategy to engineer robust 3D freestanding (Ti3C2Tx) hydrogels with hierarchically porous structures. tetraamminezinc(II) complex cation ([Zn(NH3)4]2+) is selected...

Pristine chemically modified graphene films with light weights and excellent mechanical properties can be prepared by engineering the structure of oxide sheets microstructures films. Particularly, these reduced are as strong stainless steel, ultra-tough, have high electrical thermal conductivities. graphenes (CMGs), including (GO) GO (rGO), attracted increasing interest because their unique 2D structures, and/or properties.1-6 CMG readily fabricated from dispersions via vacuum-assisted...

The oxidation of water to produce oxygen gas is related a variety energy storage systems. Thus, the development efficient, cheap, durable, and scalable electrocatalysts for evolution reaction (OER) great importance. Here, high‐performance OER catalyst, nitrogen sulfur codoped graphite foam (NSGF) reported. This NSGF prepared from commercial foil directly applied as an electrocatalytic electrode without using current collector polymeric binder. It exhibits extremely low overpotential 0.380 V...

An electrochemical capacitor (EC) with H₂SO₄ treated PEDOT:PSS/graphite foil electrodes exhibited the highest areal and volumetric specific capacitances among reported ECs phase angles larger than −80° at 120 Hz.

Today's Internet has witnessed an increase in the popularity of mobile video streaming, which is expected to exceed 3/4 global data traffic by 2019. To satisfy considerable amount requests, service providers have been pushing their content delivery infrastructure edge networks-from regional network (CDN) servers peer CDN (e.g., smartrouters users' homes)-to cache and serve users with storage resources nearby. Among caching paradigms, Wi-Fi access point cellular base station become two...

Reduced graphene oxide (rGO) ribbons with arbitrary lengths were prepared by dry spinning of the hydrogels (GO) formed via thermal annealing GO dispersions, and followed chemical reduction. These rGO are flexible, having ultrahigh tensile strengths 582 ± 17 MPa, fracture energies 18.29 2.47 MJ m(-3), high conductivities 662 41 S cm(-1), an extremely large breakdown current density about 11,500 A cm(-2). Strain sensors based on meshes these showed sensitive recoverable responses to different...

Electrodeposition of a thin layer NiFe alloy atop np+-Si with its native oxide affords an efficient and stable photoanode for photoelectrochemical water oxidation. This exhibits low onset potential 0.89 V versus RHE (Reversible Hydrogen Electrode) oxidation high solar-to-O2 conversion efficiency 3.3% in 1 m KOH under sun illumination outperforms those reported silicon photoanodes. As service to our authors readers, this journal provides supporting information supplied by the authors. Such...

Flexible electrochemical capacitors (ECs) with an ultrawide range of areal mass loading realize high-rate frequency response and ultrahigh specific capacitance.

Nacre-like graphene films are prepared by evaporation-induced assembly of oxide dispersions containing small amounts cellulose nanocrystal (CNC), followed chemical reduction with hydroiodic acid. CNC induces the formation wrinkles on sheets, greatly enhancing mechanical properties resultant films. The deliver an ultrahigh tensile strength 765 ± 43 MPa (up to 800 in some cases), a large failure strain 6.22 0.19%, and superior toughness 15.64 2.20 MJ m-3 , as well high electrical conductivity...

Composites of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and reduced graphene oxide (rGO) have been prepared by solution mixing applied as electrocatalysts for oxygen reduction reaction (ORR) after treatment with concentrated H2SO4. The blending rGO induces the conformational change PEDOT chains from benzoid to quionoid structure charge transfer PEDOT. H2SO4 post-treatment can remove part insulating PSS surface PEDOT:PSS/rGO composite film, resulting in a significant...

Ultralight free-standing RGO membranes are capable of separating multiple types surfactant stabilized oil-in-water emulsions with high separation efficiency.