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manganese ii phosphate is an inorganic compound with the formula Mn3(PO4)2. It consists of three magnesium atoms bonded to two phosphate ions, which each have a charge of negative three. This gives it the chemical formula Mg3(PO4)2 because the charges of all the atoms in the compound must balance each other out.
Manganse ii phosphate can be obtained by the chemical reduction of the manganese(IV) chloride MnCl2. This is an industrial process that uses chlorine gas as the reductant. The manganese ii phosphate formed this way is called a salt, and it is soluble in water.
Mn ii phosphate is an efficient electrocatalyst for water oxidation, a reaction that is important in photosynthesis. The catalytic performance of Mn ii phosphate is significantly superior to that of the unmodified catalyst MnO, which has the same Mn valence. The superior activity of Mn ii phosphate can be attributed to the presence of phosphate and aqua ligands that facilitate proton transfer to MnII/III, and to the asymmetry of the native out-of-plane Mn centres with terminal water ligands, which are preferential oxidation sites for water oxidation. In addition, the asymmetry of the Mn centres can stabilize the key MnIII active intermediate in Mn ii phosphate, as demonstrated by structural and spectrometric studies. These results demonstrate that the asymmetric Mn ii phosphate superstructure can be used to prepare an effective Mn electrocatalyst with high oxygen evolution rate (OER) in neutral aqueous solutions.