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

Abstract

Unique octahedral yolk‐shell Cu2O@Co(OH)2 nanocages are synthesized by a facile Cu2O 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 Cu2O templates. The un‐etched crystalline Cu2O 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 Cu2O and Co(OH)2. The octahedral yolk‐shell Cu2O@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.

Free‐Standing and High‐Sensitive Electrodes with Hierarchical Nanostructures of Bimetallic Hydroxides M(OH)x/Cu(OH)2/CF (M=Ni, Co, Fe and Zn) for Glucose Detection

“…The electrocatalytic performance comparison of the M(OH) x /Cu(OH) 2 /CF and some reported glucose‐sensing electrodes are given in Table 1. It is clear that compared with other similar electrodes, the performance of the electrodes designed in this work is superior to other electrodes and exhibits higher sensitivity, larger detection range and minimum detection limit [47–52] . The consequence illustrates the electrodes of multi‐component and multi‐hierarchical have great superiority to be applied in glucose sensors.…”

“…It is clear that compared with other similar electrodes, the performance of the electrodes designed in this work is superior to other electrodes and exhibits higher sensitivity, larger detection range and minimum detection limit. [47][48][49][50][51][52] The consequence illustrates the electrodes of multi-…”

Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation

“…Cu 2 O octahedrons were synthesized by a modified approach from a previous report [25]. A certain amount of Cu 2 O octahedrons was uniformly dispersed in 20 mL of deionized (DI) water under ultrasonic treatment for 10 min.…”

Antioxidant Activity of Telmisartan–Cu(II) Nanoparticles Connected 2-Pyrimidinamine and Their Evaluation of Cytotoxicity Activities

“…Cu enzyme activity is basically a response to many bioactivities such as connective tissue biosynthesis, cellular respiration, neurotransmitter production, iron homeostasis, peptide biogenesis, pigment formation, and antioxidant defense [20,21]. Particularly, Cu-NPs has outstanding catalytic activity to scavenge H 2 O 2 and O 2 [22] but cannot eliminate OH• simultaneously [23] and also can promote electron transfer reactions to inactivate H 2 O 2 or OH• [24]. The catalytic behavior of Cu compounds in organic reaction motivated us to focus our attention on the application of our research.…”