Electrochromic devices (ECDs) have aroused great interest because of their potential applicability in displays and smart systems, including windows, rearview mirrors, and helmet visors. In the last decades, different device structures and materials have been proposed to meet the requirements of commercial applications to boost market entry. To this end, employing simple device architectures and...

The cyclability of a graph is the maximum integer k for which every k vertices lie on a cycle. The algorithmic version of the problem, given a graph G and a nonnegative integer k, decide whether the cyclability of G is at least k, is NP-hard. We study the parametrized complexity of this problem. We prove that this problem, parameterized by k, is co-W[1]-hard and that its does not admit a polyno...

A new type of rechargeable Mg battery is demonstrated, which achieves charge transfer through simultaneous transport of Mg(2+) cations and halogen anions during electrochemical cycling. The novel Mg/AgCl battery shows remarkable rate capability up to 10 C and excellent cyclability at high rates, with a flat plateau at 2 V.

A graph G is spanning r-cyclable of order t if for any r nonempty mutually disjoint vertex subsets A1, A2, . . . , Ar of G with |A1 ∪ A2 ∪ · · · ∪ Ar | ≤ t , there exist r disjoint cycles C1, C2, . . . , Cr of G such that C1 ∪ C2 ∪ · · · ∪ Cr spans G, and Ci contains Ai for every i. In this paper, we prove that the n-dimensional hypercube Qn is spanning 2-cyclable of order n − 1 for n ≥ 3. More...

Metal sulfides are commonly used in energy storage and electrocatalysts due to their redox centers and active sites. Most literature reports show that their performance decreases significantly caused by oxidation in alkaline electrolyte during electrochemical testing. Herein, S and N co-doped graphene-based nickel cobalt sulfide aerogels are synthesized for use as rechargeable alkaline battery ...

• MnxCo 3-x O 4 -decorated separators are firstly introduced into Li-LiI-O 2 batteries. can enhance the kinetics for both I ? /I 3 and redox conversions. efficiently restrain shuttling effect. Using separator improve energy efficiency cell. A concept of battery is proposed as a new hybrid storage model. Although mediator (RM) strategy decrease overpotential in Li-O batteries by tuning electroch...

Zinc (Zn) metal is considered the promising anode for “post-lithium” energy storage due to its high volumetric capacity, low redox potential, abundant reserve, and cost. However, extravagant Zn required in present batteries, featuring utilization rate device-scale energy/power densities far below theoretical values. The limited reversibility of attributed spontaneous parasitic reactions with aq...

A facile microwave-hydrothermal approach has been used to synthesize single-crystalline Fe(3)O(4) nanowires within 15 min at 150 degrees C. The Fe(3)O(4) nanowires, after decorating with carbon, exhibit excellent cyclability and rate performance when employed as an anode in lithium ion batteries.

Hollow polypyrrole (PPy) nanospheres with high sodium storage capacity as cathode materials for Na-ion batteries were reported. PPy hollow nanospheres demonstrated high current rate capacity and good cyclability. It was revealed by electrochemical testing and DFT calculation that the as-prepared PPy hollow nanospheres participate in reversible doping/de-doping reactions.

Electrode performances of MgH2-LiBH4 composite materials for lithium-ion batteries have been studied using LiBH4 as the solid-state electrolyte, which shows a high reversible capacity of 1650 mA h g(-1) with an extremely low polarization of 0.05 V, durable cyclability and robust rate capability.