Enhancing electrochemical efficiency of rGO-supported Er2O3 electrocatalyst for water splitting Zarmeem Fatima, Rabia Yasmin Khosa, Imen Safra, Tahani Rahil Aldhafeeri, Syed Kashif Ali, Abhinav Kumar and Muhammad Rezaul Karim Eur. Phys. J. Plus, 140 6 (2025) 596 Published online: 26 June 2025 DOI: 10.1140/epjp/s13360-025-06507-6