Method for directly improving activity of borohydride fuel cell hydrogen storage alloy

Abstract

The invention provides a method for improving the activity of a hydrogen storage alloy catalyst of a direct hydroboron fuel cell. According to the volume ration of 2: 1 between acid and the hydrogen storage alloy, the hydrogen storage alloy is dipped into the acid for 3 hours, and the concentration of alkali is 1 to 2M. The invention provides a method for improving the catalyzing performance of the anode of the hydrogen storage alloy catalyst of the direct hydroboron fuel cell by acid processing, the acid processing overcomes the defects of small specific area and low electric activity of the anode catalyst of the existing hydrogen storage alloy, and solves the problem of small discharge current of the anode of the hydrogen storage alloy catalyst. The method is characterized in that the hydrogen storage alloy is processed by acid before in use, thereby enlarging the electric oxidation performance of the hydrogen storage alloy catalyst to the hydroboron. The essential of the method is to enlarge the electric chemical oxidation performance of the hydrogen storage alloy catalyst to the hydroboron and to improve the electric chemical reaction performance of the hydroboron based on the anode catalyst of the hydrogen storage alloy of the direct hydroboron fuel cell by carrying out acid processing on the hydrogen storage alloy in ahead.

Description

(1) Technical field [0001] The invention relates to a method for improving the performance of a direct borohydride fuel cell hydrogen storage alloy anode, in particular to a method for improving the catalytic performance of a direct borohydride fuel cell hydrogen storage alloy anode by acid treatment. (2) Background technology [0002] Direct borohydride fuel cell (DBFC) is a fuel cell with borohydride as the anode, NaBH 4 It is a hydrogen storage material with a high hydrogen content (11wt.%). In theory, NaBH 4 The direct electrooxidation can be 8e - reaction, with high energy density (9300Wh / kg specific energy), specific capacity (5668Ah / kg) and battery voltage (the cathode is O 2 at 1.64V); NaBH 4 Non-flammable, low toxicity (not harmful unless swallowed), does not generate CO 2 , theoretically NaBH 4 Non-platinum catalysts can be used; NaBH 4 The solution can act as a heat exchange medium to cool the battery without additional cooling plates; the electroosmotic dra...

AI Technical Summary

Problems solved by technology

NaBH 4 Electrooxidation catalysts are mainly divided into two categories, one is noble metals such as Pt, Pd, Au, Ir, Os, and Ag, among which Pt has the highest electrocatalytic activity, but is also prone to NaBH 4 Hydrolysis reaction; Au can undergo nearly 8e reaction, but its reactivity is low

The other type is hydrogen storage alloys, Choudhury et al comparatively studied AB 5 Type and AB 2 type hydrogen storage alloy to NaBH 4 Catalytic performance, the results show that the catalytic activity of hydrogen storage alloys is small, significantly lower than that of noble metals