Biochemical test chip

A biochemical test chip, comprising:

• an insulating substrate;
• an electrode unit, located on the insulating substrate, wherein the electrode unit comprises a working electrode and a counter electrode, wherein a current density of the counter electrode is greater than a current density of the working electrode;
• a first insulating septum, located on the electrode unit, wherein the first insulating septum has an opening, and the opening at least partially exposes the electrode unit;
• a reactive layer, located at the opening and electrically connected to the electrode unit;
• and
• a second insulating septum, located on the first insulating septum;
• wherein the reactive layer and a target analyte undergo a primary reaction, and the counter electrode is configured to undergo a self-redox reaction, wherein the self-redox reaction does not interfere with the primary reaction, and the self-redox reaction allows the counter electrode to have the capability of receiving or releasing additional electrons;
• wherein the counter electrode is a cathode, and a standard reduction potential of an active material of the counter electrode satisfies Es0>Em0−Ev, where the Es0 is the standard reduction potential of the active material, the Em0 is a standard reduction potential for concentration reaction on the working electrode, and the Ev is a potential applied by a measuring apparatus when providing measuring reaction.