Hollow rare-earth high-entropy carbide nanoparticles from molten-salt electroreduction improve green hydrogen production

Researchers at Inner Mongolia University of Technology developed hollow rare-earth high-entropy carbide nanoparticles via molten-salt electroreduction at 800 degrees Celsius. The dual rare-earth composition (HfNbTaTiZrCeY)C reached a hydrogen evolution overpotential of 167 mV at 10 mA/cm2 in alkaline electrolyte, with no platinum-group metals and no template-based synthesis. The work offers a single-step route to earth-abundant catalysts for green hydrogen production. Hollow architecture and rare-earth doping are both hard to achieve in high-entropy carbides, and this study combines them in one step using common transition metals plus cerium and yttrium. Performance beats earlier solid five-component carbides, though long-term stability and scale-up remain untested. If the molten-salt method scales, it could lower catalyst cost for water electrolysis and support green hydrogen from renewable power.