Functional double perovskites from bulk to thin film heterostructures: The example of La2NiMnO6

Internal Electric Field Induced by Superexchange Interaction on Mn4+‐O2−‐Ni2+ Unit Enables Highly Efficient Hybrid Capacitive Deionization

“…Both soft X-ray absorption spectroscopy (sXAS) and density functional theory (DFT) results demonstrate that electrons transfer from the 2p orbital of O 2− to the e g orbital of TM sites (Ni 2+ and Mn 4+ ) via superexchange interactions within the basic coordination structure unit of Mn 4+ -O 2− -Ni 2+ in Ni-MnO 2 . [27][28][29][30][31] The resulting charge separation induces the formation of IEF in Ni-MnO 2 , facilitating the electron and ion transfer processes during HCDI. [32] As a result, Ni-MnO 2 exhibits an obviously enhanced HCDI performance with an SRC of 72.9 mg g −1 and an SRR of 3.37 mg g −1 min −1 at 1.2 V operation voltage in 500 mg L −1 NaCl solution.…”