10 results about "Applied potential" patented technology

A system for sequencing a polynucleotide strand including a device with a layer stack on a silicon wafer. The layer stack may include a first electrode and a second electrode separated by a dielectric insulating layer and a nanohole drilled through the layer stack so that the first and second electrodes are rotationally arranged around the nanohole. A polynucleotide strand with at least one nucleotide and at least one electroactive label may be pulled through the nanohole. The system may additionally include a controller that may apply an electrical signal to the first and second electrodes, measure a current (I) as a function of an applied potential (V) when an electroactive label is guided through the nanohole of the device, and adjust an electrical voltage to pull the polynucleotide strand through the nanohole at a predetermined speed.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

A system for sequencing a polynucleotide strand including a device with a layer stack on a silicon wafer. The layer stack may include a first electrode and a second electrode separated by a dielectric insulating layer and a nanohole drilled through the layer stack so that the first and second electrodes are rotationally arranged around the nanohole. A polynucleotide strand with at least one nucleotide and at least one electroactive label may be pulled through the nanohole. The system may additionally include a controller that may apply an electrical signal to the first and second electrodes, measure a current (I) as a function of an applied potential (V) when an electroactive label is guided through the nanohole of the device, and adjust an electrical voltage to pull the polynucleotide strand through the nanohole at a predetermined speed.

The invention belongs to the technical field of laser Raman spectrum detection, and relates to a multicolor electrochromic SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof, the method comprises the following steps: synthesizing a vanadium pentoxide nanobelt by using vanadium pentoxide powder as a raw material through a simple solvent treatment method, and preparing the multicolor vanadium oxide electrochromic SERS film substrate by adopting a spraying processing technology. The multicolor vanadium oxide electrochromism SERS substrate has electrochromism and SERS effects, the change of charge transfer, charge density and band gap width is accompanied in the electrochromism process, and the SERS performance of the multicolor vanadium oxide electrochromism SERS substrate can be remarkably changed through the change. The color, the transmittance, the energy band gap and the detection performance can be accurately, reversibly and visually regulated and controlled by naked eyes by changing the external potential. The color of the multicolor electrochromic SERS substrate and the SERS detection performance have strong relevance, the SERS detection performance and molecular selectivity of the multicolor electrochromic SERS substrate can be judged through color change, and the multicolor electrochromic SERS substrate has great significance in trace detection of to-be-detected molecules.

The present invention relates to detection reagents and electrode arrangements for multi-analyte diagnostic test elements and methods of use thereof. Detection reagents, multi-analyte test elements, test systems, and multi-analyte measurement methods are provided. In particular, a multi-analyte test element has (1) a first working electrode and a first counter electrode pair covered with a first analyte-specific reagent comprising an enzyme, a coenzyme and a first medium, and has (2) a second working electrode covered with a second analyte-specific reagent comprising an enzyme, a coenzyme and a second medium, where the second medium is different from the first medium. A single counter electrode may be used as a counter electrode for both first and second analyte measurements at their respective working electrodes. Further, the medium concentration, the measurement range, and the applied potential difference are different for each analyte-specific measurement.

The invention relates to an electrochemical auxiliary material surface functional group regulation and control method which comprises the following steps: applying a control potential to a material in an electrochemical system, so that a non-uniform charge distribution region is formed on the surface of the material, reaction activity difference is generated on an interface, and a functional group reaction is limited to only occur in a potential stable section; the electric potential fluctuation in unit area is smaller than a set threshold value; a functional group precursor is introduced into a limited region, a directional electrochemical reaction is carried out under the condition of applying potential, and the generated functional group moves towards a region with low energy potential along a potential gradient under the action of interface charge migration, so that stable adsorption is realized in the region; determining the type of a target functional group formed by the site according to the local electrochemical parameters of the functional group generation site; when two or more than two functional group precursors exist in the system, a priority rule is established based on a reaction potential window, an interface reaction rate constant and adsorption affinity of a material to the precursors, a first preferred reaction path is selected, and other reaction channels are blocked.

The invention discloses an iron / activated carbon composite electrode for removing oxysalts including perchlorate in water as well as a preparation method and application of the iron / activated carbon composite electrode, and belongs to the field of water treatment technologies and environmental functional materials. According to the electrode, activated carbon (AC) serves as a substrate, nanoscale zero-valent iron particles are loaded through an impregnation-calcination method, and the iron / activated carbon (Fe / AC) composite electrode is obtained. The electrode realizes electro-adsorption enrichment of target anions (such as ClO4 <->) by periodically switching an external potential, firstly applying a positive potential, then converting the target anions into a negative potential, and efficiently reducing the target anions into non-toxic and harmless chloride ions through the synergistic effect of direct electron transfer (DET) and hydrogenation reduction. The Fe / AC electrode prepared by the method has the characteristics of low cost, high catalytic activity, good stability and the like, has an excellent removal effect on persistent inorganic pollutants including low-concentration perchlorate in water, and is particularly suitable for deep purification of underground water and drinking water.

Detection reagents, multi-analyte test elements, test systems, and multi-analyte measuring methods are provided. In particular, multi-analyte test elements have (1) a first working electrode and first counter electrode pair covered with a first analyte-specific reagent that includes an enzyme, a coenzyme and a first mediator and have (2) a second working electrode covered with a second analyte-specific reagent that includes an enzyme, a coenzyme and a second mediator, where the second mediator is different than the first mediator. The single counter electrode can be used as the counter electrode for both the first and second analyte measurements at their respective working electrodes. Moreover, the mediator concentrations, measurement ranges, and applied potential differences are not the same for each analyte-specific measurement.

The application discloses a Ce-doped Cu-based perovskite oxide catalyst and a preparation method thereof and belongs to the technical field of CO2 electrocatalysis, and comprises the following steps: Pr(NO3)3, Cu(NO3)2 and CeNO3 are added into a container, water is added to stir and dissolve, citric acid monohydrate is added to chelate metal cations after dissolution, the solution is adjusted to be neutral, and stirring is conducted until the solution is gelatinous; the gelatinous substance is pre-fired, and roasting is conducted after pre-firing, so that Pr2Cu 0.9 Ce 0.1 04 catalyst is obtained. 0.9 Ce 0.1 04(PCCe 0.1 ) has very good electroreduction performance on carbon dioxide in the application of CO2 electrocatalytic reduction. With the increase of applied potential, the FE of CO decreases, and the FE of C2H4 increases and then decreases. C2H4 is dominant at-1.2 V vs. RHE, which indicates that H2 is only inhibited at a proper applied potential, and the maximum FE% of C2H4 is 25% at-1.2 V vs. RHE; the FE% of the PC catalyst is improved by 10% after etching by acid, and the PC catalyst is improved by 66.7% compared with PC.

The invention discloses a high-temperature proton membrane fuel cell device and method for producing ammonia and generating power through NO reduction. The device comprises an anode, a cathode, a proton exchange membrane, a gas diffusion layer and an external circuit. The anode is configured to receive H2 and perform oxidation reaction; the cathode is configured to receive NO gas and carry out reduction reaction, and the NO reduction reaction path is regulated and controlled through a cathode catalyst; the proton exchange membrane is a high-temperature proton exchange membrane, and the operating temperature range is 100-200 DEG C; the cathode catalyst is configured to regulate and control the NO reduction path in the applied potential range, so that N2 or N2O is preferentially generated in the potential interval of 0.9 V to 0.2 V, and NH3 is generated in the potential interval of 0.2 V to 0 V. According to the method, the problem of catalyst poisoning at low temperature is avoided, harmful NO pollutants can be converted into high-added-value chemicals, and the problem of resource waste is solved; nO is treated while power is generated, the overall energy utilization efficiency is improved, secondary pollution is reduced, the operation cost is reduced, and remarkable environmental and economic benefits are achieved.