Hydrated\nManganese(II) Phosphate (Mn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O) as a Water Oxidation Catalyst
Kyoungsuk Jin (1612345)Jimin Park (1396840)Joohee Lee (1802206)Ki Dong Yang (1544911)Gajendra Kumar Pradhan (1802215)Uk Sim (1802218)Donghyuk Jeong (1666093)Hae Lin Jang (1612342)Sangbaek Park (1515673)Donghun Kim (1666099)Nark-Eon Sung (1802212)Sun Hee Kim (228574)Seungwu Han (1802209)Ki Tae Nam (1544905)
Abstract
The development of\na water oxidation catalyst has been a demanding\nchallenge in realizing water splitting systems. The asymmetric geometry\nand flexible ligation of the biological Mn<sub>4</sub>CaO<sub>5</sub> cluster are important properties for the function of photosystem\nII, and these properties can be applied to the design of new inorganic\nwater oxidation catalysts. We identified a new crystal structure,\nMn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O, that\nprecipitates spontaneously in aqueous solution at room temperature\nand demonstrated its high catalytic performance under neutral conditions.\nThe bulky phosphate polyhedron induces a less-ordered Mn geometry\nin Mn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O.\nComputational analysis indicated that the structural flexibility in\nMn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O could\nstabilize the Jahn–Teller-distorted Mn(III) and thus facilitate\nMn(II) oxidation. This study provides valuable insights into the interplay\nbetween atomic structure and catalytic activity.
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