Mn3+ surface active sites enriched manganese phosphate nano-polyhedrons for enhanced bi-functional oxygen electrocatalyst
deviprasath chinnadurai a, kandasamy prabakar a
a Department of Electrical Engineering, Pusan National University
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#SolFuel19. Solar Fuel Synthesis: From Bio-inspired Catalysis to Devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Roel van de Krol and Erwin Reisner
Poster, deviprasath chinnadurai, 344
Publication date: 16th 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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