Tube-Sponge-Inspired hierarchical electrocatalysts with boosted mass and electron transfer for efficient oxygen evolution

Hindered gas bubble release and limited electron conducting process represent the major bottlenecks for large scale electrochemical water splitting. Both the desorption of bubbles and continuous electron transport are achievable on the surfaces of biomimetic catalytic materials by designing multiscale structural hierarchy. Inspired by the tubular structures of the deep-sea sponges, we fabricated an exceptionally active and binder-free porous nickel tube arrays (PNTA) decorated with NiFe-Zn