There is actually very little on the core part of the syllabus about voltaic cells under Topic 9.2 but it does contain the mandatory laboratory component in the Applications and skills section, "Performance of laboratory experiments involving a typical voltaic cell using two metal/metal-ion half-cells". All that Standard Level students really need to know is how two half-cells (e.g. Mg(s), Zn(s), Fe(s) and Cu(s) in solutions...