Negative ${\mathrm{E}}^{\ominus }$ indicates that redox couple is

A negative E° means that the redox couple is a stronger reducing agent than ${\mathrm{H}}^{+}/{\mathrm{H}}_2$, couple. A positive E° means that the redox couple is a weaker reducing agent than the ${\mathrm{H}}^{+}/{\mathrm{H}}_2$ couple.