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Urchin-like Ru-doped W18O49 nanospheres assembled from nanorods are synthesized via a straightforward hydrothermal process. The resultant electrocatalyst, with very low Ru content of 3.2 wt%, exhibits outstanding performance for the acidic HER. The remarkable performance can be attributed to the Ru dopants, and the distinctive urchin-like hierarchical nanostructure.

Graphical abstract: Self-assembly of ruthenium-doped oxygen-deficient tungsten oxide as an efficient electrocatalyst for the hydrogen evolution reaction in acidic environments

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