High-stability direct methanol fuel cell membrane electrode based on CNT material

A methanol fuel cell, high-stability technology, used in fuel cells, battery electrodes, fuel cell components, etc., can solve problems such as hindering oxygen transmission, limiting battery energy density and service life, and reducing catalyst utilization. Solve the effect of cathode flooding, improve long-term discharge stability, and improve drainage rate
CN104577147AInactive Publication Date: 2015-04-29HARBIN INST OF TECH
4 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2015-04-29
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a high-stability direct methanol fuel cell membrane electrode based on a CNT material, and belongs to the technical field of proton exchange membrane fuel cells. The membrane electrode is composed of an anode diffusion electrode, a Nafion proton exchange membrane and a cathode diffusion electrode, wherein a diffusion layer of the cathode diffusion electrode is prepared from CNT material paper. According to the membrane electrode disclosed by the invention, the structure of a direct methanol fuel cell can be simplified; the volume of the fuel cell is reduced; meanwhile, the water logging problem on one side of the cathode in the direct methanol fuel cell is well solved, so that the oxygen mass transfer of the cathode is increased; the stability of the cell for lastingly working for a long period of time is improved; the contact resistance between a collector plate and the membrane electrode is significantly reduced; the problem of internal resistance increase caused by PTFE used as the mass transfer baffle layer in a traditional structure is avoided; and the performance of the battery is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and relates to a direct methanol fuel cell membrane electrode. Background technique

[0002] Thanks to the high energy density of liquid methanol, the theoretical specific energy of Direct Methanol Fuel Cell (DMFC) can reach 4900Wh / L, nearly five times that of lithium batteries. However, in practical applications, the Nafion membrane is used as the electrolyte membrane of methanol fuel cells, and there is a serious problem of methanol permeation. This methanol permeation will not only cause waste of fuel and lower system efficiency, but also increase cathode polarization and reduce the output voltage of DMFC. At the same time, water mostly leaves the cathode in the form of water vapor in DMFC. However, in a lower temperature range, such as 20-65 °C, more than 95% of the water at the cathode is accumulated in the cathode catalytic layer in liquid form, resulting in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More