Ionic control of mixed-anion compounds and reduced oxides using electric field

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Our work shows that using the electrochemical protonation and associated dehydration reaction paves out a novel route to explore reduced metal oxides. The dehydration is also simple but effective. It is quite similar as the general dehydration occurs in ATP or alcohol synthesis, where the bonding oxygen is removed and new bonding and structure are formed. However, the electric-field provides additional energy to weaken the metal-oxygen hybridization. Thus, the lattice oxygen can be easily released from the system under heating, when these oxygen ions cannot be removed by other methods.The obtained SrCoO2 exhibits unique 4-legged spin-tube structure, which cannot be obtained by well-known reduction reactions. Considering the electrochemical protonation is well explored in many oxides, large number of precursors can be considered to explore their products after dehydration. Even for known oxyhydride, electrochemical protonation might further reduce these compounds and H2 releasing instead of H2O can be expected. More importantly, the proton injection/dehydration could be expanded to all types of materials and this will eventually reveal large number of undiscovered structures and associated exotic properties.In the final fiscal year of this funding, our results were accepted by Journal of the American Chemical Society (J. Am. Chem. Soc. 2021, 143, 42, 17517-17525). The related results will be also presented in JSAP 69th conference in 2022 Spring.