Facet-Dependent Cu₂O Electrocatalysis for Wearable Enzyme-Free Smart Sensing

Abstract

Exploiting electrocatalysis for wearable enzyme-free biosensors and biofuel cells has recently greatly developed in preliminary medical diagnosis and human healthcare fields. Herein, several facet-controlled cuprous oxide (Cu2O) nanostructures have been systematically fabricated to investigate the facet-dependent electrocatalysis mechanism. As a result, cuboctahedral Cu2O with a hollow structure exhibits optimal sensing performance for glucose detection compared with octahedral or extended hexapod Cu2O. The facet-dependent sensing process reveals that Cu2O­{100} and Cu2O­{111} facets are helpful in acquiring a higher interaction with enzyme-free substrates and accelerating electron transfer, respectively, to improve electrocatalytic activity. As a proof of concept, combined with a portable wireless device, wearable Cu2O enzyme-free biofuel cell systems can achieve glucose sensing by both open circuit potential and power output signals, which would potentially be used for a wearable enzyme-free energy platform. Therefore, this wearable enzyme-free smart sensing concept would help in the targeted establishment of biomarker electrocatalysts, and further offers considerable promise for the development of biofuel cells in the wearable healthcare monitoring field.

Voltammetric Detection of Glucose—The Electrochemical Behavior of the Copper Oxide Materials with Well-Defined Facets

“…In contrast, according to Jiang et al, the {111} should firstly accelerate electron transfer [48]. However, the higher catalytic activity should be assigned to the {100} facets.…”

“…One of the proposed mechanisms of glucose detection by Cu 2 O involves adsorbed hydroxyl molecules and electrochemically activated formation of Cu(OH) 2 [51]. The electrocatalysis mechanism of the cuprite materials toward the glucose follows [48]:…”

“…It follows that for the process of glucose detection to take place, there must be a conversion of Cu 1+ to Cu 2+ , then to Cu 3+ , and finally due to oxidation of glucose Cu 3+ →Cu 2+ . According to Jiang et al [48], the analyte molecules should firstly be adsorbed at the {100} facets. Reactions 4 and 5 should take place easily taking into consideration the low energy activation and work function [31].…”

Design of Intelligent Perception Module Based on Wireless Sensor Network and Basketball Sports Attitude

“…This paper uses the multitransducer data fusion means to discuss. Information fusion is a new information processing means for the specific problem of a system composed of multiple transducers of the same or multiple types [7]. It is also called multisource correlation, multisource synthesis, transducer mixing, or multitransducer.…”

Encapsulation of Cu2O Micro/Nanoparticles into Activated Carbon Felt as a Catalyst in Organic Reactions

“…Cuprous oxide (Cu 2 O) is one of the most intensively studied metal oxide semiconductor materials and has been applied in many fields, such as photocatalysis, sensors, , nanomotors, and antibacterials . Of course, many other extensive applications of metal oxides have also been reported. − In particular, the advantages of low cost, high efficiency, and easy synthesis make Cu 2 O popular as an organic reaction catalyst.…”