4 results about "Direct borohydride fuel cell" patented technology

The invention discloses a high-performance direct hydroboron fuel cell membrane electrode and a preparation method thereof, and belongs to the technical field of fuel cells. The high-performance direct hydroboron fuel cell membrane electrode comprises an anion exchange membrane, an anode catalyst layer located at the anode of the anion exchange membrane and a cathode catalyst layer located at the cathode of the anion exchange membrane, and an adhesive of the cathode catalyst layer is a cation exchange membrane solution. And the binder of the anode catalyst layer is an anion exchange membrane solution or a cation exchange membrane solution. According to the invention, the membrane electrode obtained by optimizing the catalyst layer binder and the ion exchange membrane can show excellent electrochemical performance in the O2-NaBH4 fuel cell. The anion exchange membrane has higher ionic conductivity, and the cation exchange resin in the cathode catalyst layer greatly reduces the amount of BH4 <-> permeating into the cathode, so that the performance and durability of the DBFC can be effectively improved.

The application discloses a cobalt-phosphorus-cobalt oxide composite electrode material and application thereof as an anode of a direct borohydride fuel cell. First, a conductive substrate is placed in an aqueous solution containing a cobalt source, ammonium fluoride and urea to perform a hydrothermal reaction; after being reduced to room temperature, the conductive substrate is repeatedly cleaned with deionized water, and then is placed in a solution containing sodium hypophosphite to perform immersion; finally, the conductive substrate is calcined at high temperature in a vacuum environment to obtain the cobalt-phosphorus-cobalt oxide loaded on the conductive substrate in situ. The electrode material preparation method provided by the application converts the original contact between a carrier gas and an electrode surface in a phosphorization process into the in-situ adhesion of a phosphorus solution on the electrode surface, realizes a uniform phosphorization process, is low in cost and easy to be industrialized, and the material can be used as an anode material of the direct borohydride fuel cell.

The invention belongs to the technical field of fuel cells, and particularly relates to a multi-metal series catalyst and a preparation method and application thereof. The multi-metal series catalyst is composed of two structures, wherein one structure is a transition bimetal-based hydrotalcite material and is of a sheet structure; and the other one is noble metal nanoparticles uniformly dispersed on the carbon material, and the average size is less than 10 nanometers. The prepared series catalyst is applied to sodium borohydride electrooxidation reaction, the bimetal-based hydrotalcite material is used as an active site for borohydride adsorption and preliminary oxidation, and the noble metal nanoparticles are used as an active site for further oxidation of a preliminary oxidation product of borohydride. As the anode catalyst of the direct fuel cell, the anode catalyst not only has high electron transfer number, but also shows relatively high power density. Compared with other common catalysts, the use amount of precious metal is low, the preparation method is simple and controllable, and high application value is shown in the field of direct hydroboron fuel cells.

The invention discloses a preparation method of an anode catalyst of a direct hydroboron fuel cell and a preparation method of an anode. A preparation method of an anode catalyst of a direct hydroboron fuel cell comprises the following steps: carrying out ball milling on as-cast iron-boron alloy for 60-80 cycles by adopting a planetary ball mill to obtain a ball-milled sample; drying the ball-milled sample to obtain iron-boron alloy powder used as the anode catalyst of the direct hydroboron fuel cell; wherein the mass ratio of Fe to B in the as-cast iron-boron alloy is (3.5-4.0): 1; the ball-milling medium is absolute ethyl alcohol, the ball-to-material ratio is (3.5-4.5): 1, and the ball-milling rotating speed is 300-400 rpm; one period is set as follows: the planetary ball mill rotates forwards for 18-22 min and stands for 7-11 min, and then the planetary ball mill rotates reversely for 18-22 min and stands for 7-11 min. The method disclosed by the invention is beneficial to improving the catalytic performance of the obtained anode catalyst.