Ruddlesden-Popper phase

Ruddlesden-Popper (RP) phases are a type of perovskite structure that consists of two-dimensional perovskite-like slabs interleaved with cations.

The general formula of an RP phase is An+1BnX3n+1, where A and B are cations, X is an anion (e.g., oxygen), and n is the number of octahedral layers in the perovskite-like stack.

In contrast to the conventional solid-state method, chimie douce or soft chemistry techniques are often utilized to synthesize this class of materials.

In a metal-air battery, OER is the process of charging that occurs at the air electrode, while ORR is the discharging reaction.

Here, R-NH3+ is long organic chain or cyclic ammonium cation, A is methylamine (MA) or formamidine (FA), B is Pb or Sn, and X is halogen ions.