A nickel-based catalyst additive for the preparation of high-efficiency catalytic direct oxidation of borohydride

Abstract

A nickel-based catalyst additive for preparing high-efficiency catalytic direct oxidation of borohydride radicals, characterized in that: (1) under normal temperature and pressure, 0.2mol / dm 3 Nickel Sulfate NiSO 4 , 0.6g / dm 3 Lanthanum Chloride LaCl 3 The solution is used as the electrolyte, and the pH is adjusted to about 3; (2) with 2cm 2 The smooth Ni sheet is placed in the above solution as the working electrode, the carbon rod is the counter electrode, and the calomel electrode is the reference electrode; (3) Ni is deposited on the metal nickel sheet by the constant potential method to make a nickel-based catalyst; Potential ‑1.0V, deposition time 110s, deposition temperature 301.15K. Due to the addition of LaCl in the electrolyte 3 With surface activity, it is easy to adsorb to the surface of the electrode and will not be reduced, so that after the deposition is completed, micropores are formed on the surface of the coating, which increases the specific surface area of ​​the catalyst, thereby improving the activity of the catalyst. Compared with no added LaCl 3 The prepared catalyst, which on BH 4 ‑ The oxidation peak current increased to 0.2004A, making the fuel utilization rate increased 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] At present, expensive metal catalysts such as Pt, Ag, Pd, and Au are usually used to improve the anode performance of direct boron-hydrogen 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...

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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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