The present invention provides an oxygen evolution reaction catalyst, wherein the oxygen evolution reaction catalyst is an oxide material comprising iridium, tantalum and ruthenium: wherein the oxygen evolution catalyst comprises a crystalline oxide phase having the rutile crystal structure; wherein the crystalline oxide phase has a lattice parameter a of greater than 4.510 .

High entropy boride-platinum group metal alloys and uses thereof are described. The high entropy boride-platinum group metal alloys can include boron, a platinum group metal, and additional metals, such as aluminum (Al), niobium (Nb), tantalum (Ta), and/or titanium (Ti). The high entropy boride-platinum group metal alloys have multiple uses and provide high catalytic activity and sulfur resistance.