High-entropy alloys in a radial mesostructured TiO 2 support for efficient hydrogen evolution

, the cell voltage is reduced by 1.25 V compared to conventional overall water splitting, while stable operation is maintained for 50 h at high current densities. This work establishes a viable strategy for integrating high-entropy alloys with ordered mesoporous oxide supports toward highly active and durable electrocatalysts for energy-saving hydrogen production.