Crystal facet engineering of perovskite cobaltite with optimized electronic regulation for water splitting

The correlation between crystal facets and electronic configurations of perovskite is closely related to the intrinsic activity for water splitting. Herein, we proposed a unique molten-salt method (MSM) manipulate properties LaCoO3 by fine-tuning its facet atomic doping. samples with oriented (110) (LCO (110)) (111) (111)) were motivated capping agent (Sr2+). Compared LCO plane, Sr-doped (LSCO planes possessed higher O 2p positions, stronger Co 3d–O covalencies, spin states inducing CoO6 distortion, thus leading superior oxygen evolution reaction (OER) hydrogen (HER) performances. Specifically, overpotentials at 10 mA cm−2 299, 322, 289 mV (110), (111), LSCO respectively. In addition, Sr substitution bestowed enhanced stability on due strengthened Co–O bonding. present work enlightens new avenues regulating engineering atom doping provides valuable reference electron structure-electrocatalytic connection OER HER.