https://doi.org/10.1351/goldbook.HT06787
The Haber–Weiss cycle consists of the following two reactions:
$\ce{H2O2 + OH^{.} -> H2O + O2^{−} + H^{+}}$
and
$\ce{H2O2 + O2^{-} -> O2 + OH^{-} + OH^{.}}$
The second reaction achieved notoriety as a possible source of hydroxyl radicals. However, it has a negligible rate constant. It is believed that iron(III) complexes can catalyse this reaction: first, Fe(III) is reduced by superoxide, followed by oxidation by dihydrogen peroxide.See also: Fenton reaction