High-entropy Mn-based double perovskite as a highly active and CO2-resistant cathode for solid oxide fuel cells

Solid oxide fuel cells (SOFCs) are eco-friendly energy conversion devices that directly transform chemical energy into electricity. The development of cathode materials with high catalytic activity and durability plays a vital role in advancing the commercialization of SOFCs. In this study, a novel high-entropy double perovskite oxide, Pr0.4Nd0.4Ba0.4Sr0.4Ca0.4Mn2O5+delta (PNBSCMO), was designed. The significant disorder effect induced by high entropy is expected to enhance the oxygen reduction reaction (ORR) kinetics, thereby improving catalytic performance. At 800 degrees C, PNBSCMO exhibits a polarization resistance (Rp) of 0.07 Omega center dot cm(-2), representing a 36.36 % reduction compared to PBMO. Furthermore, the single cell based on PNBSCMO achieves a peak power density of 0.83 W center dot cm(-2) at 800 degrees C. Experimental results demonstrate that PNBSCMO outperforms PBMO in terms of electrochemical activity, electrical conductivity, thermal stability, and CO2 tolerance, highlighting its great potential as a cathode material for SOFCs. This work provides valuable insights into the future development of highly stable and active cathode materials for SOFCs.