Composite porous electrode for sulfuric acid system and preparation method thereof

The invention discloses a composite porous electrode for a sulfuric acid system and a preparation method thereof. From inside to outside, the electrode is sequentially provided with an enhanced metal substrate, a Pb or Pb-based alloy (Pb-Me') transition layer and a Pb or Pb-based alloy (Pb-Me'') porous layer. The preparation method for the electrode comprises the following steps of: preparing the transition layer by performing chemical plating and metal melt immersion plating in the molten salts of chlorides or directly by performing the metal melt immersion plating, and preparing the porous layer by adopting an infiltration method or an antigravity infiltration method. Due to the adoption of the transition layer, the enhanced metal substrate and the porous layer in the composite porous electrode are combined more firmly, even electrolyte cannot permeate into and corrode the substrate through the porous layer, and the electrode has longer service life. The method of the invention has the advantages of prepari