Abstract
A novel enzyme-free self-powered glucose sensing system with a unique capability to convert the biochemical energy of glucose into electrical power is developed. The electrical power is subsequently stored in a 10 pF capacitor serving as the glucose transducing element. The anode and cathode of the fuel cell used to construct the self-powered glucose biosensing system comprise a gold microwire supported colloidal platinum structure (Au-co-Pt) and bacterial nanocellulose (BNC) coated with gold-co-Pt and a thin layer of chitosan, respectively. The electrochemical properties of the nanocomposites were investigated by means of amperometry. The charge/discharge frequency of the 10 pF capacitor in response to various concentration of glucose was investigated. The self-powered glucose biosensing system exhibited excellent electrocatalytic activity towards glucose oxidation with a sensitivity of 122.6 Hz mM−1 cm−2 and a linear dynamic range up to 25 mM glucose. In addition, the electrical power generated by the fuel cell was demonstrated to be sufficient to power an LED circuit and small low powered electronic devices. This enzyme-free self-powered glucose sensing system holds great promise to the electrochemical detection of glucose.
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