A ternary layered PdPS is employed as a catalyst for ORR in alkaline medium. � The ORR is found to occur through a direct four electron pathway. � PdPS has been used as cathode catalyst in anion exchange membrane fuel cell. � A peak power density of 340 mWcm À 2 at 60 � C is observed for the AEMFC. � Performance in fuel cell is quite comparable to that of Pt/C under similar conditions.

Herein, we report chalcopyrite phase of zinc tin phosphide (ZnSnP 2 ) as an anode for high rate, rechargeable, lithium-ion battery. In-situ Raman spectroscopy reveals the conversion of chalcopyrite phase of ZnSnP 2 to a symmetric sphalerite phase upon cycling, which helps in achieving stable and reversible capacity at high discharge rates. This is due to the low bandgap and high conductivity of the sphalerite phase. The in-situ phase conversion is extremely important as it is difficult to synthesize bulk ZnSnP 2 sphalerite phase by the known methods till date. After full phase conversion, a reversible capacity of 750 mAh g À 1 is obtained towards the end of 1700 cycles at a rate of 5 A g À 1 . Full cell assembled using LiCoO 2 as the cathode material yields a stable performance with a discharge capacity of around 500 mAh g À 1 at 0.5 A g À 1 and the rate capability studies demonstrate reversible capacities up to 15 A g À 1 current.