41 results about "Reversible hydrogen electrode" patented technology

An electrode catalyst that maintains catalytic activity under conditions of an electrode potential as high as 0.4 V or above and exhibits improved stability. The metal oxynitride electrode catalyst is composed of an oxynitride containing at least one transition metal element selected from the group consisting of La, Ta, Nb, Ti, and Zr, the metal oxynitride electrode catalyst being used at a potential of 0.4 V or higher relative to the reversible hydrogen electrode potential in an acidic electrolyte. The metal oxynitride electrode catalyst is useful as an electrode catalyst for electrochemical systems used in acidic electrolytes in the fields of water electrolysis, organic electrolysis, fuel cells, etc.

This electrochemical reduction device (10) is provided with an electrode unit (100), a power control unit (20), an organic matter storage tank (30), a water storage tank (40), a steam separator (50) and a control unit (60). This electrode unit (100) has an electrolyte film (110), a reduction electrode (120) and an oxygen-generating electrode (130). The electrolyte film (110) is formed from ionomers. The reduction catalyst used in the reduction electrode (120) contains at least one of Pt and Pd. This oxygen-generating electrode (130) contains a noble metal oxide catalyst such as RuO2, IrO2, etc. Representing the potential in the reversible hydrogen electrode as VHER, the standard redox potential of an aromatic hydrocarbon compound or nitrogen-containing heterocyclic aromatic compound as VTRR, and the potential of the reduction electrode (120) as VCA, the control unit (60) controls the power control unit (20) such that the relation VHER-20mV @ VCA @ VTRR is satisfied.

A corrosion-resistant electrode catalyst for oxygen reduction includes a main catalyst composed of at least one transition metal oxide selected from oxygen-deficient ZrO2, Ta2O5, Nb2O5, TiO2, V2O5, MoO3, and WO3 and a co-catalyst composed of gold. The electrode catalyst is used in contact with an acidic electrolyte at a potential at least 0.4 V higher than the reversible hydrogen electrode potential. The catalyst may be used, for example, in such a form that the transition metal oxide in the form of fine particles and gold in the form of fine particles, or fine particles including fine gold particles coated with the transition metal oxide are dispersed on a catalyst carrier which is an electron conductive powder. This electrode catalyst is suitable as an electrode catalyst for an electrochemical system using an acidic electrolyte in the fields of water electrolysis, inorganic / organic electrolysis, fuel cells, etc.

The invention relates to an evaluation device and evaluation method of an electrocatalyst property used for a solid polymer electrolyte fuel cell and water electrolysis, and belongs to the technical field of electrocatalyst activity evaluation. The problem that environment at which the electrocatalyst is located is different from actual application in a currently widely adopted liquid three-electrode system and the technical problem that evaluation the technology is tedious, the amount the needed catalyst is high, the cost is high and the influence factor is complex in an assembled battery evaluation method. The evaluation device microminiaturizes a membrane electrode assembly, a reversible hydrogen electrode is added as a reference electrode to test an electrocatalytic property, the advantages of the currently widely adopted liquid three-electrode system and a membrane electrode catalytic property are combined, and the catalyst is made to be located in the solid polymer electrolyte fuel cell to test the electrocatalyst property of the solid polymer electrolyte and better simulates the catalytic property in an actual using environment. The evaluation method can accurately and effectively evaluate the electrocatalyst property used for the polymer electrolyte fuel cell and the water electrolysis.

The invention belongs to the technical field of electrolysis water catalyzation, and discloses a catalytic oxygen evolution electrode and a preparation method and application thereof. The catalytic oxygen evolution electrode is prepared in a manner that the voltage equivalent to -0.8 V--0.4 V of the voltage of a saturated Ag / AgCl reference electrode is applied in an electrolyte and the constant-pressure treatment time ranges from 30 s to 1800 s. According to the method that the catalytic oxygen evolution electrode can be used for reducing electrolysis water energy consumption, the catalytic activity of a noble metal catalyst (RuO2, IrO2), a metal catalyst (Co3O4) and a double perovskite material PrBa0.5Sr0.5Co1.5Fe0.5O5+alpha nanowire is improved; the treatment method is simple and practicable, and in the electrode preparation process, the shape and size of the electrode can be controlled; and the oxygen evolution performance of the catalytic oxygen evolution electrode prepared by themethod under the voltage ranging from 1 V to 2 V (relative to a reversible hydrogen electrode) is greatly improved, and application prospects are good.

The present invention relates to a kind of preparation method of the iron oxide photoanode that oxalic acid and tetrabutyl titanate act together, obtain iron film by simple electrodeposition, soak oxalic acid (H 2 C 2 o 4 ) ethanol solution, ultrasonically soak tetrabutyl titanate (TBT), and finally anneal to obtain Fe 2 o 3 -H 2 C 2 o 4 +TBT photoanode. Because oxalic acid and tetrabutyl titanate increase the specific surface area of ​​iron oxide and reduce electron-hole recombination, its photoelectric performance has been improved. Under AM1.5 standard test conditions, the photocurrent density can reach 0.59mA cm at 1.23V relative to the reversible hydrogen electrode ‑2 . Different from the publicly reported methods, the raw materials of this method are cheap and easy to obtain, the whole photoelectrode preparation process is quick and easy to prepare in large quantities. And different from the previous method of controlling the morphology, it is done by simple impregnation and chemical reaction.

The invention relates to a ferroelectric composite Cu2O visible light water photolysis hydrogen production photocathode and a preparing method thereof. The photocathode is sequentially composed of a BiFeO3 ferroelectric film layer, a gold nano-rod granular layer, a Cu2O film layer and a silicon wafer substrate from top to bottom, and heterojunctions are formed between the Cu2O film layer and the BiFeO3 ferroelectric film layer. According to the ferroelectric composite Cu2O visible light water photolysis hydrogen production photocathode and the preparing method of the photocathode, adverse effects of energy band barriers between the Cu2O film layer and the BiFeO3 ferroelectric film layer are eliminated through gold nano-rod granules by means of the LSPR effect, absorption of visible light with the wave length ranging from 650 nm-750 nm is strengthened, the Cu2O film layer is protected by the BiFeO3 ferroelectric film layer, residual polarization electric fields are used for eliminatingupwarp barriers on photoelectrode / electrolyte interfaces, the water photolysis efficiency and the hydrogen production efficiency are improved, the light current density reaches 91 microampere / cm<2>, and the threshold voltage relative to a reversible hydrogen electrode reaches 1.01 V.