Growth of Cu particles on a Cu₂O truncated octahedron: tuning of the Cu content for efficient glucose sensing

Abstract

A simple and versatile hydrothermal method is developed to synthesize Cu-Cu2O, in which Cu particles grow on the surface of a Cu2O truncated octahedron. Through the reduction of Cu(2+) by glucose in an alkaline solution, the Cu2O truncated octahedron is quickly formed via a kinetic control process, and then Cu particles selectively nucleate on the high-energy (110) facets of Cu2O, generating a heterostructure. The amount of Cu in the sample is successfully tuned by varying the reaction temperature. Compared to Cu2O, the hybrid Cu-Cu2O architecture shows superior electrocatalytic performance for glucose oxidation due to the synergistic effect between more electrocatalytic active but less conductive Cu2O and more conductive but less electrocatalytic active Cu. By tuning the content of Cu in the heterostructure, the highest electrocatalytic activity is achieved at the Cu/Cu2O molar ratio of 0.83.

Isolating Single Sn Atoms in CuO Mesocrystal to Form Ordered Atomic Interfaces: An Effective Strategy for Designing Highly Efficient Mesocrystal Catalysts

“…[12,43,44] The observed changes in the product morphology when using different precursor salts (Table S5 and Figure S15, Supporting Information) mainly result from the different assembly behaviors of the generated NPs due to the distinct reduction property of the precursor. [45,46] In addition, it was found that in the above cases, once there was the presence of CH 3 COOH, the obtained product was a regular assembly structure, proving that CH 3 COOH plays a pivotal role in directional assembly, consistent with the previous report. [12] Indeed, when CH 3 COOH was replaced by H 2 SO 4 (Table S6 and Figure S16, Supporting Information), irregular blocks were formed, strongly supporting this conclusion.…”

Self‐Supporting AuCu@Cu Elongated Pentagonal Bipyramids Toward Neutral Glucose Sensing

“…There are ten spots representing (111) faces around the central point. The ten spots constitute two pentagons, which can be indexed to fi ve suits of pattern taken from the direction close to [1][2][3][4][5][6][7][8][9][10] of Cu. These results reveal the multiple twinned structure of the copper particle.…”

“…Achieving active and cost‐effective catalysts with good performance and durability for glucose electrooxidation reaction (GEOR) in a neutral solution remains challenging. Considerable progress has been made on Ni‐, Cu‐, and carbon‐based electrocatalysts to increase the performance and biocompatibility . However, it is frustrating that only a few of these catalysts show activity in a neutral solution due to the great dependency of activity on the presence of OH − anions …”

“…Considerable progress has been made on Ni-, Cu-, and carbon-based electrocatalysts to increase the performance and biocompatibility. [3][4][5] However, it is frustrating that only a few of these catalysts show activity in a neutral solution [ 6 ] due to the great dependency of activity on the presence of OH − anions. [ 7 ] Noble metals, such as Au, Pt, et al, have been widely studied in the past decades owing to their good activity and durability in neutral media.…”

Nonenzymatic glucose detection using Au nanodots decorated Cu2O nanooctahedrons

“…18 Therefore, there have been extensive investigations on Cu 2 O-based materials for nonenzymatic biosensors. 19,20 In addition, the octahedral Cu 2 O nanostructures have the advantages of high surface state distribution uniformity, large proportion of detection and recognition sites for specific particles, good thermodynamic stability, and repeatability. 21,22 Owing to these merits, the Cu 2 O nanooctahedrons have become a promising candidate material for electrochemical oxidation of glucose.…”