i will try to synthesize the anodic aluminum oxide (AAO) in galvanostatic mode (constant current mode) for making linear pore arrangement

(ref: SERS Platforms of Plasmonic Hydrophobic Surfaces for Analyte Concentration: Hierarchically Assembled Gold Nanorods on Anodized Aluminum)

So, i will buy the carbon counter electrode for that.

Could you recommend the type of electrode

for example, glassy carbon plate or glassy carbon rod, graphite foil, graphite rod.