Impact of Nickel on Iridium–Ruthenium Structure and Activity for the Oxygen Evolution Reaction under Acidic Conditions oleh Erlend Bertheussen, Simon Pitscheider, Susan R. Cooper, Rebecca Pittkowski, Katrine L. Svane, Aline Bornet, Erik M. Wisaeus, Kirsten M. Ø. Jensen, Jan Rossmeisl, Matthias Arenz, Christian Kallesøe, Christoffer M. Pedersen