Biostimulator having low-polarization electrode(s)

A biostimulator system, comprising:

• a transport system including a catheter having a distal end;
• and
• a biostimulator coupled to the distal end and including:
• a housing containing an electronics compartment,
• a fixation element coupled to the housing,
• an attachment feature coupled to the housing,
• a low-polarization coating on one or more of the fixation element or the attachment feature, wherein the low-polarization coating effectively enlarges a surface area of the fixation element or the attachment feature, and
• one or more processors in the electronics compartment, wherein the one or more processors are configured to:
• detect an evoked response signal between the low-polarization coating and one or more of a cathode or an anode of the biostimulator, and
• determine whether a target tissue has been captured based on the evoked response signal.