Additive for improving nickel anode catalyst performance of direct borohydride fuel cell

Abstract

The invention relates to a thiourea (TU) additive for improving the nickel anode catalyst performance of a direct borohydride fuel cell .A preparation method of the additive comprises the following steps that at atmospheric pressure, on the condition that the temperature ranges from 293.15 K to 313.15 K, metal nickel is deposited on a Ni piece electrode through a constant electric potential (-0.8 V) method, and a prepared nickel-based catalyst serves as a nickel anode catalyst; a thiourea (TU) solution of 0.045 mol / L is prepared, 1 mL of the well-prepared thiourea solution is taken and diluted by five times to enable the concentration of the thiourea solution to be 0.009 mol / L, and the solution serves as an electrolyte additive .A hydrophobic thin film is formed on the surface of the nickel-based catalyst by means of thiourea (TU), the thin film changes distribution of BH4<-> on the surface of the nickel-based catalyst, and the BH4<-> electrochemical oxidation efficiency is improved .Shift of BH4<-> electrochemical oxidation peak potential is caused by addition of thiourea (TU), the electrochemical impedance of the system becomes smaller, the discharging efficiency becomes higher, the discharge potential is more negative, and the discharging time is longer.

Description

technical field [0001] The invention belongs to the field of electrochemical applications, and in particular relates to an additive for improving the performance of a nickel anode catalyst of a direct boron-hydrogen fuel cell. Background technique [0002] Currently, expensive metal catalysts such as Pt, Ag, Pd, and Au are usually used to improve the performance of nickel anode catalysts in direct boron-hydrogen fuel cells. To reduce the cost, Ni metal with catalytic ability has also been used as an anode catalyst for direct borohydrogen fuel cells. However, when Ni-based is used as an anode catalyst in the prior art, Ni is easily corroded in an alkaline environment and loses its catalytic activity, resulting in BH 4 - The electrochemical reaction impedance during direct oxidation is large, the charge transfer resistance of the electrode reaction is large, and the reaction rate is slow, BH 4 - The direct oxidation performance is not high, and the fuel discharge efficienc...

AI Technical Summary

Problems solved by technology

However, when Ni-based is used as an anode catalyst in the prior art, Ni is easily corroded in an alkaline environment and loses its catalytic activity, resulting in BH 4 - The electrochemical reaction impedance during direct oxidation is large, the charge transfer resistance of the electrode reaction is large, and the reaction rate is slow, BH 4 - The direct oxidation performance is not high, and the fuel discharge efficiency is low

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