Single-cell-array biomass-templated architecture of hierarchical porous electrocatalysts for Zn-air and Zn-H 2 O 2 batteries.

Hierarchically macro-meso-microporous ZIF-67/nori-derived electrocatalysts were synthesized by using single-cell-array nori and ZIF-67 as macroporous and microporous templates, and KOH as a meso/micropore-forming reagent. The ZIF-67/nori-800-based Zn-H 2 O 2 battery achieved a high maximum power density, of 476 mW cm -2 , and a specific energy density of 964 W h kg -1 at 50 mA cm -2 .