Direct hydrogen storage alloy anode catalyst for borohydride fuel battery

Abstract

The invention provides a hydrogen storage alloy anode catalyst of direct hydroboron fuel batteries; transition metal oxide is added in the hydrogen storage alloy anode catalyst, and the mass ratio of the adding quantity of the transition metal oxide and the hydrogen storage alloy is 5-10 : 95-5. The doping of the transition metal oxide provides a new activity position for hydrogen adsorption and dissociation, improves the catalytic activity of the hydrogen storage alloy and solves the problem that anode discharging current of the hydroboron fuel battery is low. The hydrogen storage alloy anode catalyst is characterized in that: the mixture of the transition metal oxide and the hydrogen storage alloy increases the electrical catalysis performance of the hydrogen storage alloy to the hydroboron. In the essence of the invention, on the basis of anode catalyst of the hydrogen storage alloy of the direct hydroboron fuel batteries, the electrochemical oxidation susceptibility of the hydrogen storage alloy to the hydroboron is increased by mixing the transition metal oxide, and the discharge performance of the hydroboron anode is improved.

Description

(1) Technical field [0001] The invention relates to a direct borohydride fuel cell hydrogen storage alloy anode catalyst, in particular to a direct borohydride fuel cell hydrogen storage alloy anode catalyst material containing transition metal oxides. (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 drag of water can be used as a cathode reactant witho...

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