Arch-shaped self-oxygen-supply waste heat utilization type direct methanol fuel cell

Abstract

The invention discloses an arch-shaped self-oxygen-supply waste heat utilization type direct methanol fuel cell comprising an arch-shaped shell, a pervaporation membrane, a central reaction part, an oxygen generation cavity and a thermodynamic cycle system. The arched shell is divided into a methanol fuel cavity and a steam cavity by the pervaporation membrane; a gas buffer structure is arranged in the steam cavity; the gas buffer structure comprises a first hydrophobic fiberboard and a first hydrophilic porous board arranged at an interval with the first hydrophobic fiberboard; the central reaction part is provided with an anode flow field plate, a membrane electrode and a cathode flow field plate, the membrane electrode is located between the anode flow field plate and the cathode flow field plate, and a second hydrophilic porous board is arranged between the anode flow field plate and the anode side of the membrane electrode; a second hydrophobic fiberboard is arranged between the cathode side of the membrane electrode and the cathode flow field plate; and the oxygen generation cavity is provided with a double-layer third hydrophobic fiberboard. The energy density of the cell iseffectively improved, and high-concentration methanol and even pure methanol supply of the cell is realized and thus the working time of the cell is prolonged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an arch-type direct methanol fuel cell for self-supplying oxygen and waste heat utilization. Background technique [0002] Vapor-passive direct methanol fuel cell (V-DMFC) is a form of direct methanol fuel cell. Because of its higher energy density, weaker methanol breakthrough phenomenon, and longer working time, it has wider development and research value, but the steam supply method and reasonable management methods of V-DMFC are the key factors to inhibit the overall development of V-DMFC. The key factor for the enhanced performance, especially for the realization of pure methanol feed to V-DMFC, which appears to be particularly important. [0003] The electrode and cell reactions of a direct methanol fuel cell are as follows: [0004] The anode reaction is CH 3 OH+H 2 O→6H + +6e - +CO 2 [0005] The cathode reaction is 3 / 2O 2 +6H + +6e - →3H 2 o [0006] The ...

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Problems solved by technology

Water droplets cover and block the cathode flow field plate, so that oxygen cannot continue to pass through the cathode flow field plate to reach the membrane electrode, which seriously hinders the progress of the reaction

[0009] In order to solve the problem of the mutual influence of methanol and water evaporation in Guo and Faghri's scheme, Jewett et al. in the literature Gregory Jewett, Zhen Guo, Amir Faghri.Performance characteristics of vapor feed passive miniature direct methanol fuel cell[J].InternationalJournal of Heat and Mass Transfer,2009,52(19-20). The above feeding mechanism was optimized. They separated water and methanol into two fuel tanks for storage, and then exported them to the evaporation area with capillary wicks respectively. The optimized system can Actively control the ratio of fuel to control the output of the battery, but this design will undoubtedly increase the volume of the system and increase the difficulty of battery management

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