113 results about "Viologen" patented technology

The aqueous neutral organic flow battery comprises a single battery or an electric pile consisting of more than two single batteries. Each single battery comprises a positive electrode, a diaphragm and a negative electrode. A positive electrolytic solution is introduced between the positive electrode and the diaphragm, and a negative electrolytic solution is introduced between the negative electrode and the diaphragm. The positive electrolyte in the positive electrolytic solution is a complexing agent of bromine salt and bromine; the negative electrolyte in the negative electrolytic solution is viologen or a viologen derivative; or electrolytes in the positive electrolytic solution and the negative electrolytic solution are bromine salt, a bromine complexing agent and viologen or viologenderivatives; and water is used as a solvent. The positive electrode is subjected to bromine ion redox reaction, the negative electrode is subjected to viologen single-electron or double-electron redoxreaction, and no metal element participates in electrochemical reaction. The positive electrolytic solution and the negative electrolytic solution are both neutral, and the diaphragm between the positive electrode and the negative electrode of the battery adopts a porous membrane. The battery has the characteristics of high energy density, low cost, sustainability and the like.

The invention discloses a pyrroline / alkoxy free radical compound aqueous organic flow battery. A copper plate is used as a current collector; an electrolyte is a neutral water salt solution; two graphite plates with serpentine runners are used as flow field plates of positive electrode liquid and negative electrode liquid; graphite felt or carbon paper is used as a reaction electrode, a positive reaction electrode and a negative reaction electrode are separated by an anion exchange membrane, and reduced pyrroline / alkoxynitride free radicals and derivatives thereof are used as positive organicactive substances; one of viologen and derivatives thereof or zinc is used as a negative electrode active substance; according to the invention, pyrroline / alkoxy free radical active substances are adopted to show good oxidation-reduction reversibility and rapid reaction kinetics characteristics in a neutral aqueous solution, the battery performance, activity and safety are high when the battery isused in cooperation with a proper negative electrode, the battery can be widely applied with increasingly improved requirements for efficient and safe storage of wind energy and solar energy.

Disclosed are viologen derivatives as an electrochromic material having improved stability and lifetime, a metal oxide electrode including the same, and an electrochromic device using the viologen derivative as an electrochromic material. The viologen derivative includes a suitable regulator group capable of increasing ΔE that is a potential difference between E1 (potential at the first redox reaction) and E2 (potential at the second redox reaction). When ΔE increases, the mole fraction of viologen molecules present in the second reduction state decreases. Therefore, it is possible to lower the mole fraction of viologen molecules present in an irreversibly reduced state at an applied potential, thereby increasing the lifetime of an electrochromic material and an electrochromic device.

The present invention relates an electro-active polymeric ionic liquid including imidazolium-based molecules, said imidazolium-based molecule comprising each at least: —one imidazolium moiety associated with a negatively-charged counter-ion, and —one reducible group selected from: Formula (IV), —an anthraquinone derivative of formula (IV): with R1 representing a hydrogen atom or a C1-C6-alkyl group, —a viologen group, and —a metallocene reducible group such as a cobaltocene group.

The invention discloses a double-electron compound flow battery system based on salt cavern, which comprises a positive electrode active substance and a negative electrode active substance, and is characterized in that TEMPO4-sodium sulfonate is used as the positive electrode active substance, and an asymmetric dual-electron viologen compound is used as the negative electrode active substance. According to the invention, the positive electrode active substance and the negative electrode active substance are easy to prepare, and the reaction conditions are mild, the synthesis route is short andthe cost is low. The double-electron compound flow battery system can be suitable for a battery environment of a salt cavern system, and has the advantages of environmental friendliness, high cycle efficiency, adjustable properties and the like.

The invention discloses a methyl viologen visual detection method based on a cadmium telluride quantum-dot / filter paper compound. The method comprises the steps of uniformly mixing cadmium telluride quantum-dot solution and glycerol; immersing filter paper strips into the solution and taking the filter paper strips out; absorbing away superfluous glycerol and superfluous cadmium telluride quantum dots on the cadmium telluride / filter paper compound with clean filter paper, drying the cadmium telluride / filter paper compound and cutting the cadmium telluride / filter paper compound into square pieces for standby; adding methyl viologen drops of different concentrations onto the centers of the square filter paper pieces, performing brightness analysis on the centers of the square cadmium telluride / filter paper compound pieces, according to an equation of Q=(F0-F) / F0, obtaining a standard curve; adding methyl viologen drops to be detected onto the cadmium telluride quantum-dot / filter paper compound, analyzing the center of the cadmium telluride quantum-dot / filter paper compound with the methyl viologen drops through imageJ software and performing concentration, and finding the corresponding concentration from the standard curve. The methyl viologen visual detection method based on the cadmium telluride quantum-dot / filter paper compound is simple and easy to implement, applicable to popularization and application; sensors manufactured according to the method is high in selectivity and stability.