I have doped BFO with Mn (0.025%, 0.05%, 0.075% and 0.1%) and observed that first photocatalytic water oxidation activity decreased than pure BFO for 0.025% and then it increased for 0.05% which again decreased for 0.1%. I want to understand what could be the possible reason for this trend? I have repeated several times but every time trend is the same. Thanking you all in advance for your precious time and kind suggestions/comments.
Regards,
Jafar