Preparation of high-efficiency catalytic nickel-based catalyst additive with directly-oxidized borohydride

Abstract

Preparation of a high-efficiency catalytic nickel-based catalyst additive with directly-oxidized borohydride is characterized by comprising the steps of (1) preparing 0.2mol / dm<3> of nickel sulfate NiSO4 and 06g / dm<3> of lanthanum chloride LaCl3 solution as an electrolyte under normal temperature and normal pressure, and adjusting pH to about 3; (2) placing a smooth Ni sheet with 2cm<2> as a working electrode in the solution, a carbon rod as a counter electrode and a calomel electrode as a reference; and (3) depositing Ni onto a metal nickel sheet to prepare a nickel-based catalyst by a constant-potential method, wherein the employed deposition potential is -1.0V, the deposition time is 110 second, and the deposition temperature is 301.05K. The LaCl3 added into the electrolyte has surfaceactivity, is easily absorbed to an electrode surface and cannot be reduced, so that micropores are formed in a surface of a plating layer after deposition is completed, the specific surface area of the catalyst is expanded, and the activity of the catalyst is further improved; and compared with a catalyst which is not added with the LaCl3, the peak current of oxidization peak of BH4<-> is increased to 0.2004A, so that the fuel utilization rate is improved to 41.46%.

Description

technical field [0001] The invention belongs to the field of electrochemical applications, and in particular relates to a method of adding rare earth elements to the electrolytic solution, and using an electrodeposition method to prepare a borohydride (BH 4 - ) Nickel-based catalysts with direct oxidation properties. Background technique [0002] Currently, expensive metal catalysts such as Pt, Ag, Pd, and Au are usually used to improve the anode performance of direct borohydrogen fuel cells. To reduce the cost, the non-noble metal Ni 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, resulting in a decrease in catalytic activity, resulting in BH 4 - The impedance of the electrochemical reaction during direct oxidation increases, the charge transfer resistance of the electrode reaction is large, and the re...

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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, resulting in a decrease in catalytic activity, resulting in BH 4 - The impedance of the electrochemical reaction during direct oxidation increases, 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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