High-power flexible single-enzyme glucose fuel cell and preparation method thereof

A fuel cell and glucose technology, applied in biochemical fuel cells, battery electrodes, circuits, etc., can solve the problems of low battery power density, low enzyme immobilization, weak electron transfer, etc., and achieve low cost, high sensitivity, and large open circuit voltage and the effect of power density

Active Publication Date: 2020-03-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of low enzyme immobilization of traditional enzyme fuel cell anode materials and weak electron transfer between enzyme and electrode, resulting in low battery power density, the present invention provides a high-power flexible single-enzyme glucose fuel cell and its preparation method

Method used

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  • High-power flexible single-enzyme glucose fuel cell and preparation method thereof
  • High-power flexible single-enzyme glucose fuel cell and preparation method thereof
  • High-power flexible single-enzyme glucose fuel cell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of embodiment 1 glucose fuel cell

[0032] The glucose fuel cell of this embodiment is prepared by the following method:

[0033] (1) Using graphite powder as raw material, graphene oxide (GO) was synthesized by the improved Hummers method: a 250mL three-necked flask was placed in an ice-water bath, and 35mL concentrated H 2 SO 4 , add 0.6g graphite powder and 1.0g NaNO while stirring 3 , continue stirring and add 3.0g KMnO 4 . Keep stirring at 35°C for more than 2h, add 150mL of distilled water to dilute, raise the temperature to 98°C, and stir for 5-15min. Preheat 200mL of deionized water (about 60°C) in advance, stir and slowly pour the reacted solution into it, then add 10mL of H 2 o 2 , the solution gradually turned yellow. Finally, filter while hot, wash and dry to obtain GO.

[0034] (2) Preparation of reduced graphene oxide (rGO) by chemical reduction method: at room temperature, 30 mg of brown GO, 27 mL of 1% trisodium citrate and 2 mL o...

Embodiment 2

[0039] With reference to the preparation steps of Example 1, the difference is that (3) in the preparation of the PTFE / rGO flexible electrode, the mass ratio of PTFE and rGO is adjusted, and the specific steps are as follows:

[0040] Weigh 4 parts of 0.04g rGO powder respectively, according to the mass ratio of rGO powder and PTFE 1:3, 1:4, 1:5, 1:6, mix rGO powder with 60% PTFE solution, press into tablets and dry. The rGO sheet after drying was used as the working electrode, the platinum electrode was used as the auxiliary electrode, and the saturated mercury glycoside electrode was used as the counter electrode to form a three-electrode system. Differential pulse voltammetry scanning was performed, and the results were as follows: image 3 As shown in A.

[0041] When the ratio of rGO and PTFE is 1:2 or 1:7, it is difficult to form a sheet when the two are mixed. As the amount of PTFE increases, the conductivity of rGO is suppressed, thereby reducing the electrochemical e...

Embodiment 3

[0043] Prepare bioanode according to Example 1, with different concentrations of Bi 3 Ti 2 o 8 F is mixed with 20mg / mL GOD solution in equal volume, and the power is measured and compared in the glucose solution. Specifically: mix 20mg / mL GOD solution with 2.5mg / mL, 5.0mg / mL, 10mg / mL, 20mg / mL Bi 3 Ti 2 o 8 The chitosan solution of F was mixed ultrasonically at a volume ratio of 1:1, the mixed liquid was dropped on the surface of the PTFE / rGO flexible electrode, and fixed with Nafion solution to prepare different bioanodes, and the power was measured in the glucose solution. The result is as image 3 As shown in B, when Bi 3 Ti 2 o 8 When F concentration is 5mg / mL, 10mg / mL, GOD: Bi 3 Ti 2 o 8 When the F mass ratio is 2:1 to 4:1, the open circuit voltage and power density are larger.

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Abstract

The invention discloses a high-power flexible single-enzyme glucose fuel cell and a preparation method thereof. According to the present invention, a three-dimensional semiconductor nano material Bi3Ti2O8F is prepared by using a hydrothermal synthesis method, and the Bi3Ti2O8F nanosheet is crosslinked and vertically grows, so that rich active sites are provided for fixing the glucose oxidase and transferring the electrons, and the electron transfer rate is obviously increased. A high-power flexible single-enzyme fuel cell is prepared by taking a flexible PTFE / rGO sheet prepared by a simple tabletting method as a biological cathode, the glucose oxidase as an anode catalyst, the Nafion / GOD / Bi3Ti2O8F / rGO as a biological anode and the glucose as a biofuel. The flexible glucose fuel cell disclosed by the invention is prepared by utilizing a single enzyme system without needing a diaphragm, and has a larger open circuit voltage and power density. The performance of the battery is measured inthe 75 mM glucose buffer solution, on the optimal condition, an output voltage is about 0.6 V, and the output power density of 650 [mu] W.cm <-2 >. The high-power flexible single-enzyme glucose fuelcell and the preparation method thereof are suitable for the fields of portable medical detection equipment and green renewable energy sources.

Description

technical field [0001] The invention belongs to the technical field of glucose fuel cells, and relates to a high-power flexible single-enzyme glucose fuel cell and a preparation method thereof. Background technique [0002] Biofuel cells (BFCs) use enzymes or microorganisms as catalysts to oxidize biofuels and reduce the amount of oxidant on the electrodes to obtain energy. Compared with conventional fuel cells, BFCs have unique operational and functional advantages. First, unlike precious metal catalysts, which are expensive and have limited storage capacity, catalysts for biofuel cells are green, safe, and widely sourced. At the same time, the anode fuels of BFCs come from renewable biofuels from plants and animals, while O 2 Usually, it acts as an oxidant at the cathode to directly convert the substrate into electrical energy, ensuring a high energy conversion efficiency. Secondly, BFCs can effectively operate under normal temperature, normal pressure or even low tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/16
CPCH01M8/16H01M4/9008H01M4/88Y02E60/50
Inventor 胡效亚俞清华徐琴黄利辉
Owner YANGZHOU UNIV
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