353results about How to "The experiment process is simple" patented technology

The invention provides a method for preparing carbon-supported nucleocapsid type Ni-Pt particles for direct methanol fuel cell catalysts, which belongs to a preparation process of direct methanol fuel cell catalysts. The method comprises the steps of adopting sodium citrate as a stabilizer, adopting cationic surfactant CTAB as dispersant, using sodium hypophosphite to reduce nickel acetate, generating a Ni kernel on the surface of Vulcan XC-72 or mesoporous carbon treated with sodium borohydride, washing superfluous sodium hypophosphite and generating a Pt shell on the surface of the Ni kernel through chemical replacement. The catalyst has a structure with the Ni kernel and the Pt shell, and has the advantages of low Pt support amount and high catalytic activity.

The invention relates to a rock wettability evaluating method used for petroleum drilling and exploration, which utilizes the frequency dispersion character of rock electrical parameter to conduct reservoir rock wettability evaluating. The dispersion information of phase has closer relationship with the wettability comparing with the resistivity; therefore the evaluating result is more accurate and reliable. The method has the characters of being simple, visual and convenient, which doesn't need special experiment device and the experiment period is short, the maneuverability is strong, the experiment process is simple, and can be conducted under normal temperature and pressure, and which also can be conducted under stimulating the high temperature and pressure of reservoir condition.

The invention discloses a preparation method of porous nickel oxide / tin dioxide micro / nano spheres, which comprises the following steps: stirring tin tetrachloride pentahydrate, nickel sulfate hexahydrate, sodium hydroxide and ammonia water which are used as raw materials, heating, separating, washing, drying and the like to obtain micro / nano spherical hydroxy nickel stannate; and roasting a micro / nano spherical NiSn(OH)6 precursor at high temperature, and cooling to respectively obtain porous micro / nano spherical NiO / SnO2 powder. The micro / nano spherical NiO / SnO2 product prepared by the method disclosed by the invention is light green powder, and has the advantages of large specific area and good product quality. The impedance gas sensing element prepared from the micro / nano spherical NiO / SnO2 powder has high sensitivity, and the sensitivity S value for 100ppm methylbenzene and formaldehyde gases is respectively up to 19.8 and 27.6.

The invention relates to a lithium ion battery electrochemical impedance online monitoring testing method. With the method adopted, the technical problem that an existing testing method cannot complete electrochemical impedance testing online can be solved. The method of the invention includes the following steps that: S100, a battery to be tested is arranged in a constant-temperature cabinet, andthe battery to be tested is charged to be in a certain SOC; S200, electrochemical impedance spectroscopy (EIS) testing is performed on the battery to be tested, and impedance values generated by eachpolarization are obtained through analysis; 300, the battery which has been subjected to the EIS testing is connected with a high-precision test cabinet, and current pulses of different gradients areapplied to the battery; and S400, the pending voltage of the battery before the pulse of certain pulse current I is recorded as U0, and the voltage of the battery after a pulse t 2 is recorded as Ut,and deltaU=U0-Ut, and deltaU and pulse current I under different pulse current are selected, so that graphing can be performed, linear fitting is performed, and a slope, namely the impedance value ofDCR testing, is obtained. According to the method of the invention, a direct current method and an alternating current method are combined; the on-line monitoring of the electrochemical impedance change of the battery can be realized through the direct-current impedance test of small-rate current pulses. The method has the advantages of simple experimental process and high practicability.

The invention relates to a soil basic respiration determining technique, concretely a soil basic respiration determining method and device. It uses absorbing plate as CO2 absorbing device, places soil sample at the bottom of a sealed container, places the absorbing plate in or below the middle of the sealed container and above the soil sample, makes routine culture, then takes out the absorbing plate and add in indicator and mix, and directly titrates in the absorbing plate, and then finds out the CO2 quantity released by the soil during the culture; its device includes a sealed container, splint, and supporting rod, where the supporting rod passes through the container cover and is installed with the splint in the sealed container and the absorbing plate is placed on the splint. It has good repetition and excellent stability.

The invention discloses a silicon nano-material with a three-dimensional cross-linked structure as well as a preparation method and application thereof. The silicon nano-material with the three-dimensional cross-linked structure is extracted from silicate minerals by adopting a fused salt reduction method; specifically, the preparation method comprises the following steps: uniformly mixing magnesium powder or aluminum powder, aluminum chloride and a silicon dioxide precursor formed by carrying out hydrothermal acidification treatment and derivatization on natural silicate minerals; carrying out sealed fused salt reduction reaction in a reaction kettle to prepare the silicon nano-material with the three-dimensional cross-linked structure. The method disclosed by the invention is simple andefficient and is easy to prepare; prepared silicon particles have good characteristics of high purity, small size, high specific capacity and the like, and have a wide application prospect in the energy-storage fields including electrode materials of ion batteries and the like.

The invention discloses a method for preparing porous graphene. The method comprises the following steps: mixing a soluble metal saline solution with a graphene oxide water solution, stirring and drying, and performing thermal treatment and acid treatment to obtain the porous graphene material; the metal in the soluble metal saline solution is chosen from nickel, cobalt, copper, iron or manganese. The invention also discloses the porous graphene prepared by the method and an application of the the porous graphene to a supercapacitor. By adopting the method for trepanning graphene by using a metal cation, provided by the invention, the preparation process is simple, the application scope is wide, the aperture and pore distribution is simple to control and the industrialization of the porous graphene is possible.