Here we report a simple efficient one-step strategy to fabricate Oxidation Reduction Reaction (ORR) or/and Oxygen Evolution Reaction (OER) electrocatalysts directly from agricultural cornstalks waste with hierarchical porous structures and massive active hydroxyl groups. CaCl2 and NH4Cl activators were utilized to corrode the cornstalks in order to create a mesopore N-doped hybrid str... https://macorners.shop/product-category/mens-cuban-link-chain/