Octahedral Cu₂O@Co(OH)₂ Nanocages with Hierarchical Flake‐Like Walls and Yolk‐Shell Structures for Enhanced Electrocatalytic Activity

Abstract

Abstract Unique octahedral yolk‐shell Cu 2 O@Co(OH) 2 nanocages are synthesized by a facile Cu 2 O self‐templated strategy as efficient glucose oxidation electrocatalysts. Amorphous Co(OH) 2 nanoflakes are formed as octahedral shells through coordinating etching conversion from part of Cu 2 O templates. The un‐etched crystalline Cu 2 O octahedrons are then remained as cores and voids exist between the cores and shells. The special structure endow these yolk‐shell heterostructure nanocages with abundant active sites, large surface area, and synergistic effect between Cu 2 O and Co(OH) 2 . The octahedral yolk‐shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation in terms of high sensitivity of 1340 μA cm −2 mM −1 , low detection limit of 2 μM, wide linear sensing range, and long‐term stability. This strategy might shed lights on the synthesis of various yolk‐shell heterostructure nanocages with controllable structures and enhanced catalytic performances.