Positive ions migrate toward the cathode during electrolysis as a fundamental electrochemical principle required for charge neutrality and reduction reactions.
The claim is a fundamental electrochemical fact: positively charged ions (cations) are attracted to the negatively charged cathode during electrolysis. The retrieved papers consistently document this phenomenon across various electrochemical and microbial electrolysis systems (e.g., migration of nickel and ammonium ions to the cathode). Because this is a well-established scientific fact of direct everyday/foundational observation in electrochemistry, the verdict is COMMON_KNOWLEDGE, and the supporting papers confirm instances of this process.