Synergistic Optimization of NiFe‐LDH‐Based Composite Electrocatalysts Through Ce Doping and RuO ₂ Modification for Efficient Overall Water Splitting

ABSTRACT The development of dual‐functional electrocatalysts with outstanding properties in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great significance in the field of hydroelectrolysis hydrogen production. Herein, we propose to simultaneously optimize the HER and OER properties of NiFe‐LDH‐based composite electrocatalysts through cerium doping and RuO 2 modification. Benefiting from the synergistic effect of flower‐like surface morphology with a large number of fine structures, formation of highly active species as well as RuO 2 containing Ru 3+ species, RuO 2 ‐Ce‐NiFe‐LDH‐0.01/NF only needs low overpotential of 48 and 214 mV for HER and OER to achieve 10 mA cm −2 , respectively. More significant, the electrolyzer of RuO 2 ‐Ce‐NiFe‐LDH‐0.01/NF//RuO 2 ‐Ce‐NiFe‐LDH‐0.01/NF only demands 1.48 V to deliver 10 mA cm −2 and demonstrates robust stability for 100 h. This work opens up a pathway to develop remarkable bifunctional electrocatalysts, demonstrating their enormous potential for industrial applications in water electrolysis.