24.2.5—Standard cell potentials

The more positive reduction potential is the cathode; the less positive half-cell is oxidised at the anode. Electrons flow through the external circuit from anode to cathode.

A positive E°cell means the written galvanic direction is feasible under standard conditions. Conventional current is opposite to electron flow, so name the quantity explicitly.

In a Zn/Cu cell, Zn is the negative anode, Cu is the positive cathode, and electrons travel from Zn to Cu through the wire.

The salt bridge carries ions, not electrons, and a positive cathode does not mean positive ions are being reduced in every context.