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A single-liquid miniature biofuel cell with boosting power density via gas diffusion bioelectrodes

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Abstract

The low solubility of gas molecules in aqueous solutions has limited the power density output of enzymatic biofuel cells. Herein, a single-liquid miniature glucose–O2 fuel cell was constructed by using gas diffusion electrodes, which were prepared by immobilizing glucose oxidase (GOx) or laccase (Lac) modified on a porous structured carbon paper (CP). Due to the fast and direct O2 diffusion from air to the active sites of the immobilized enzyme through the pores of the CP anode/cathode with controlled wettability, the maximum power output densities dramatically increased to 9.64 μW cm−2 at 0.43 V and 53.0 μW cm−2 at 0.45 V for the cell in 5 mM glucose and after exposing the cell to air or O2 atmosphere, respectively. Interestingly, the resulting single-liquid cell could harvest power from human serum operating at a maximum power density of 49.0 μW cm−2 at 0.2 V. The biofuel cell fabricated by the gas diffusion electrodes displayed advantages such as high output power density, low cost and high ‘on-chip’ integrability and miniaturization, which suggest its great potential for implantable self-powered sensors and for many future applications.

Graphical abstract: A single-liquid miniature biofuel cell with boosting power density via gas diffusion bioelectrodes

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Article information


Submitted
26 Sep 2019
Accepted
29 Nov 2019
First published
30 Nov 2019

J. Mater. Chem. B, 2020, Advance Article
Article type
Paper

A single-liquid miniature biofuel cell with boosting power density via gas diffusion bioelectrodes

J. Wan, L. Mi, Z. Tian, Q. Li and S. Liu, J. Mater. Chem. B, 2020, Advance Article , DOI: 10.1039/C9TB02100K

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