Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Manganese based electrocatalyst for oxygen reduction and evolution reaction have been in keen search due to their excellent active center (Mn3+) and the highly active surface. Also, the dual affinity of phosphate for O and OH groups, which facilitate good O2/OH- adsorption results in better bifunctional activity over oxygen catalysis. Herein, we report a simple and effective hydrothermal synthesis method to get manganese phosphate (MnP) nano-polyhedrons using manganese and phosphate salts without any additional reducing agents. XPS results elucidate that the catalyst having a higher Mn3+ and (PO4)3- surface active sites which are best known active centres and stabilizer respectively. MnP showed an excellent ORR activity attributed due to their higher active surface through a four-electron process resulting an onset potential at 0.998 V vs RHE. Moreover, lower intermediate yield and high stability with a good methanol tolerance propose are added advantageous to be an exceptional oxygen reduction catalyst. MnP also showed a competitive oxygen evolution property with an overpotential of 286 mV and Tafel slope 76 mv/dec. The electrochemical performances were compared with state of art material IrO2/C, and the results suggest MnP did not fail in any aspect to perform as much as IrO2/C and showing even better stability. MnP showed lower ΔE=0.58 V value which proves that our catalyst is having efficient bi-functional activity.
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