Study of OER performance of lanthanide porous nanocrystalline high-entropy oxide electrocatalysts

This work examined the effects of annealing temperature and time on the performance of lanthanide electrocatalysts for the oxygen evolution reaction. Results indicate that HEO particles with multilayer pore structures have more flaws, which can enhance the catalyst's active centre. Meanwhile, the naturally chaotic phase can produce many “dangling bonds”, which offer numerous active sites with unsaturated electrical structures. Among the prepared nanostructures, HEO-250AR-3H exhibited the best OER performance, reaching a low overpotential of 320 mV at 50 mA cm⁻² and maintained a stable potential for over 72 h.