A kind of pemfc passive anode structure and its preparation and application method

Abstract

The invention belongs to the field of micro-energy and micro-machining, and particularly relates to a passive anode structure of a PEMFC (proton exchange membrane fuel cell), as well as preparation and application methods of the passive anode structure. In the anode structure, porous supporting layers and organic active layers are connected to form a pervaporation composite membrane; the plurality of organic active layers are evenly distributed at intervals on the same plane, the plurality of organic active layers are connected respectively through an electricity collection layer on the same plane, and the PEMFC passive anode structure is formed. The porous supporting layers and the organic active layers are prepared respectively by adopting an MEMS (micro-electromechanical systems) micromachining technology. When the anode structure is used, the porous supporting layers are directly contacted with a liquid fuel, and the liquid fuel permeates and passes through the porous supporting layers and the organic active layers sequentially and then volatilizes to form gas directly contacted with an anode catalyst. The anode structure can enable the liquid fuel to form gas without auxiliary equipment, so that the PEMFC can utilize the characteristics of high reaction rate and high fuel availability of a gas fuel, and also combine the advantages of easiness of storage and microminiaturization of the liquid fuel.

Description

technical field [0001] The invention belongs to the field of micro-energy and micro-machining, and in particular relates to a PEMFC passive anode structure and a preparation and application method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) can directly convert the chemical energy of fuels (such as methanol, ethanol, isopropanol, butanol, dimethyl ether, formic acid, and hydrogen) into electrical energy. Compared with other micro-energy sources, it has the advantages of high energy density, room temperature operation, environmental protection, no moving parts, and easy fuel storage. PEMFC is widely used in portable electronic devices (such as notebook computers, PDAs, digital cameras), wireless communication networks (such as mobile phones, GPS, wireless sensor network nodes), microsystems (such as microsystems composed of system-on-chip, SOC, MEMS devices) and emergency power supplies. It has outstanding advantages in aspects such as ...

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Problems solved by technology

[0004] Literature [1] (J. Lobato, P. M.A.Rodrigo, and J.J.Linares, Testing a Vapour-fed PBI-based DirectEthanol Fuel Cell, FUEL CELLS09, 2009, No.5, 597–604.) introduced a PEMFC based on PBI material vaporized liquid fuel, but due to the relative Complex, hard to miniaturize

Literature [2] (G.Jewett, Z.Guo and A.Faghri, Performance characteristics of a vapor feed passive miniature direct methanol fuel cell, Int.J.Heat Mass Transfer, vol.52, no.19, pp.4573– 4583.) Designed a fuel cell that integrates a resistor on the anode of the battery, and promotes the volatilization of liquid fuel by heating both sides of the resistor. Although this method can achieve miniaturization, it requires more energy consumption

Document [3] (Q.X.Wu, T.S.Zhao, R.Chen and W.W.Yang, A microfluidic-structured flow field for passive direct methanol fuel cells operating with highly concentrated fuels, J.Micromech.Microeng, 20(2010) 045014.) proposed A fuel cell that uses a special physical structure with a sudden change in pore radius to promote liquid volatilization. Although the structure is simple, this structure does not fundamentally solve the problem of fuel reverse osmosis due to the supply of mixed gas and liquid fuel.

Document [4] (H.K.Kim, Passive direct methanol fuel cells fed with methanol vapor, Journal of Power Sources162 (2006) 1232-1235.) reported a fuel cell based on vaporization of a porous transport layer, but its vaporization rate was too slow, And the speed is uncontrollable, resulting in low battery power density

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