Zero emission energy conversion technologies are an important component in Switzerland’s long-term climate strategy and its desired path to reduce greenhouse gas emissions to become net zero by 2050. The production of green hydrogen via alkaline water electrolysis is a key reaction for such an energy landscape on which further technologies critically rely on (e.g. methanol production through CO2 hydrogenation). The development of stable, yet inexpensive (based on earth-abundant elements) electrocatalysts for the oxygen evolution reaction (OER) remains a challenge for large-scale alkaline water electrolysis and is therefore the key focus of the current proposal. Within this project we aim to develop a new class of active, yet inexpensive catalysts, i.e., iron-based, negative charge transfer oxides based on iron, for alkaline OER. In addition to making fun-damental advances in material design, the electrocatalysts developed in this project will be integrat-ed into a large-scale electrolysis setup, in which their competitiveness with state-of-the-art catalysts will be critically assessed from both performance and economic perspectives.