Highly Efficient and Stable Solar Water Splitting at (Na)WO3 Photoanodes in Acidic Electrolyte Assisted by Non‐Noble Metal Oxygen Evolution Catalyst

Keggin-type polyoxometalates, [PW12O40]3− and [PMo12O40]3−, are shown to act as highly effective oxygen evolution reaction molecular catalysts in photoelectrochemical water splitting devices. This is the first example of an oxidatively stable in acid media, non-noble metal, water splitting catalyst that allows an exceptionally high water oxidation photocurrent of 4.5 mA cm−2 at a (Na)WO3 photoanode to be achieved. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.