Low‐Cost Hydrogen‐Evolution Catalysts Based on Monolayer Platinum on Tungsten Monocarbide Substrates

How low can you go? The lower limits of platinum loading, in the sub-monolayer to monolayer range, have been explored for the hydrogen evolution reaction (HER). A low-cost substrate material, tungsten monocarbide (see picture; W blue, C small gray spheres) is capable of supporting monolayer amounts of platinum (large blue-gray spheres) to produce an electrocatalyst with the same HER activity as bulk platinum. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by 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.