3 years ago

High-Power Formate/Dioxygen Biofuel Cell Based on Mediated Electron Transfer Type Bioelectrocatalysis

High-Power Formate/Dioxygen Biofuel Cell Based on Mediated Electron Transfer Type Bioelectrocatalysis
Kazuyoshi Takagi, Kento Sakai, Kenji Kano, Osamu Shirai, Yuki Kitazumi
A high-power mediated electron transfer type formate (HCOO)/dioxygen (O2) biofuel cell is reported herein. The cell utilizes a Ketjen Black modified waterproof carbon cloth as the electrode material. The bioanode comprises tungsten-containing formate dehydrogenase and a viologen-functionalized polymer, whereas the biocathode comprises bilirubin oxidase and 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonate). In addition, a gas diffusion type system was employed for the biocathode to realize a high-speed O2 supply. These electrodes exhibited a large current density of 20 mA cm–2 in the quiescent steady state for both HCOO oxidation and O2 reduction. Finally, these electrodes were coupled to construct an HCOO/O2 biofuel cell without a separator. The cell exhibited a maximum power density of 12 mW cm–2 at a cell voltage of 0.78 V under quiescent conditions and an open-circuit voltage of 1.2 V. We show the great potential of HCOO for the fuel of biofuel cells.

Publisher URL: http://dx.doi.org/10.1021/acscatal.7b01918

DOI: 10.1021/acscatal.7b01918

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