The development of high‐performance platinum group metal (PGM)‐free electrocatalysts for the hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells (AEMFCs) remains a great challenge. Here, a novel design strategy for improving the catalytic activity of PGM‐free catalysts by adopting N‐doped large‐porous carbon as a support material is reported. This paper shows the effect of support on the activity of non‐noble NiMo in HOR by comparing NiMo alloy on N‐doped mesocellular carbon foam (NiMo/N‐MSUF‐C) with NiMo/MSUF‐C and NiMo on N‐doped CMK‐3 (NiMo/N‐CMK‐3). The strong interaction between NiMo and N species in N‐MSUF‐C alters the electronic structure of NiMo toward optimal binding energies for H and OH. The large pores in N‐MSUF‐C facilitate the diffusion of OH− into the catalyst layer, thereby increasing the limiting current density, which is higher compared with that of NiMo/N‐CMK‐3. The AEMFC with NiMo/N‐MSUF‐C as the anode shows a higher peak power density of 152 mW cm−2 in H2/O2 compared with that of previously reported PGM‐free catalysts. These results can lead to efficient designing of highly effective AEMFCs for practical applications.
Advanced Sustainable Systems – Wiley
Published: Oct 5, 2021
Keywords: anion exchange membrane fuel cells; alkaline hydrogen oxidation; non‐noble metal; support effect