Big porosity and small particle size of cathode pellets can enhance the rate of deoxidization.Contrarily, small porosity results in the formation of compact out-layer of tantalum metal.

• 孔隙率大和粒度小均有利于电解还原的进行，孔隙率小会导致阴极产物形成致密的金属钽外层，阻碍阴极进一步脱氧；