電化學(xué)小白，要按文獻(xiàn)做一下泡沫鎳電極，有以下幾個問題求助。1、泡沫鎳買回來使用前是否要預(yù)處理，具體怎么預(yù)處理？2、文獻(xiàn)中要450℃熱處理30min，形成鈍化層是什么原因？

以下是文獻(xiàn)原文:
Ni–foam. NiZnFe4Ox was deposited on Ni–foam by direct magnetic interaction between the materials. First, Ni–foam was treated with thermal annealing at 450 °C for 30 min to generate a passivated layer on the surface. Then, 100 mg of the ferrite was sonicated for 20 min in 20 ml of Milli-Q water until a homogeneous suspension was obtained. Then, the previously treated Ni–foam was dipped in the suspension and sonicated in an ultrasonic bath for different depositions times of 15, 30 or 60 min. The final coated Ni–foam electrode was air dried.

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