Manufacturing method of fuel cell apparatus using NH3 as fuel gas

Abstract

The invention relates to a method for preparing a fuel cell unit using NH3 as a fuel gas, belonging to the fuel cell technique field. The clean BQAPPES or BQAPPESK or SPEEK electrolyte membranes are placed in hydrogen peroxide with a concentration of 4% under the temperature of 40-60 DEG C for dipping, washed by deionized water, heated for more than 2h in an alkaline solution with the concentration of 0.05-0.1 mol / L, then washed and dipped by the deionized water; the electrolyte membranes are dipped and stored in the alkaline solution with the concentration of 0.05-0.1 mol / L for standby. The standby electrolyte membranes, dipped more than 24h, together with carbon paper coated with Pt / C or Pt-Ru / C electrocatalysis are hot pressed into membrane electrodes; the membrane electrodes are put in moulds, with current collectors, to connect external loads; the O2+H2O or air is takes as cathode gas, the NH3 with a purity more than 99.9% is taken as anode fuel gas. The ammonia fuel cell has advantages of avoiding the envenom of the anode carbon and reducing the usage cost of hydrogen resource.

Description

technical field

[0001] The present invention relates to a kind of NH 3 A method for preparing a fuel cell device as fuel gas belongs to the technical field of fuel cells. Background technique

[0002] NH 3 As an important carrier of a hydrogen source, it is used as an alternative fuel gas for fuel cells after hydrogen and hydrocarbons (such as methane, methanol, etc.) due to its hydrogen content per unit molecule as high as 17.65%. Using NH 3 The advantages of being a fuel gas for fuel cells are: (1) Neither the raw material gas source nor the anode product contains CO, CO, which poisons the anode (such as noble metal Pt, etc.) 2 And other gases, thereby avoiding the adverse phenomena such as fuel cell performance degradation, short service life, and consumption of more catalysts. (2) NH 3 In the normal state, the gaseous and liquid forms are more common, and the properties are stable. Compared with hydrogen, it is more convenient and safer to store and transport. (3) ...

Examples

Embodiment 1

[0034] Embodiment 1: the anode load is 3mg / cm 2 The Pt / C membrane electrode and the quaternized naphthylbiphenyl polyethersulfone anion exchange membrane (BQAPPES) are hot-pressed to form a film (hot-pressing temperature is lower than 70°C, the pressure is about 1.0-2.0MPa), and the Pt net is attached The device is sealed and put into the single fuel cell mould. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 80°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 40ml / min, and the cathode is fed into O 2 , the intake flow rate is 40ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.68V; close the circuit, adjust the load to 15Ω, and the maximum output current is 35mA. During the test, deionized water was continuously added dropwise to the upper end of the ion exchange membrane to keep the ion e...

Embodiment 2

[0035] Embodiment 2: the anode load is 3mg / cm 2 The Pt-Ru / C membrane electrode and the quaternized polyether sulfone ketone anion exchange membrane (BQAPPESK) are hot-pressed to form a membrane, and the Pt mesh current collector is attached, sealed and put into a single fuel cell mold. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 80°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 100ml / min, and the cathode is fed into O 2 , the intake flow rate is 70ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.84V; close the circuit, adjust the load to 15Ω, and the maximum output current is 48mA. During the test, deionized water was continuously added dropwise on the upper end of the ion exchange membrane to keep the ion exchange membrane in a wet state.

Embodiment 3

[0036] Embodiment 3: the anode load is 3mg / cn 2 The Pt / C membrane electrode and the phenolphthalein-type polyethersulfone anion exchange membrane (SPEEK) are hot-pressed to form a film, and the Pt net current collector is attached, sealed and put into a single fuel cell mold. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 20°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 100ml / min, and the cathode is fed into O 2 , the intake flow rate is 70ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.60V; close the circuit, adjust the load to 15Ω, and the maximum output current is 30mA. During the test, deionized water was continuously added dropwise on the upper end of the ion exchange membrane to keep the ion exchange membrane in a wet state.

technical field

[0001] The present invention relates to a kind of NH 3 A method for preparing a fuel cell device as fuel gas belongs to the technical field of fuel cells. Background technique

[0002] NH 3 As an important carrier of a hydrogen source, it is used as an alternative fuel gas for fuel cells after hydrogen and hydrocarbons (such as methane, methanol, etc.) due to its hydrogen content per unit molecule as high as 17.65%. Using NH 3 The advantages of being a fuel gas for fuel cells are: (1) Neither the raw material gas source nor the anode product contains CO, CO, which poisons the anode (such as noble metal Pt, etc.) 2 And other gases, thereby avoiding the adverse phenomena such as fuel cell performance degradation, short service life, and consumption of more catalysts. (2) NH 3 In the normal state, the gaseous and liquid forms are more common, and the properties are stable. Compared with hydrogen, it is more convenient and safer to store and transport. (3) ...

Examples

Embodiment 1

[0034] Embodiment 1: the anode load is 3mg / cm 2 The Pt / C membrane electrode and the quaternized naphthylbiphenyl polyethersulfone anion exchange membrane (BQAPPES) are hot-pressed to form a film (hot-pressing temperature is lower than 70°C, the pressure is about 1.0-2.0MPa), and the Pt net is attached The device is sealed and put into the single fuel cell mould. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 80°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 40ml / min, and the cathode is fed into O 2 , the intake flow rate is 40ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.68V; close the circuit, adjust the load to 15Ω, and the maximum output current is 35mA. During the test, deionized water was continuously added dropwise to the upper end of the ion exchange membrane to keep the ion e...

Embodiment 2

[0035] Embodiment 2: the anode load is 3mg / cm 2 The Pt-Ru / C membrane electrode and the quaternized polyether sulfone ketone anion exchange membrane (BQAPPESK) are hot-pressed to form a membrane, and the Pt mesh current collector is attached, sealed and put into a single fuel cell mold. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 80°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 100ml / min, and the cathode is fed into O 2 , the intake flow rate is 70ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.84V; close the circuit, adjust the load to 15Ω, and the maximum output current is 48mA. During the test, deionized water was continuously added dropwise on the upper end of the ion exchange membrane to keep the ion exchange membrane in a wet state.

Embodiment 3

[0036] Embodiment 3: the anode load is 3mg / cn 2 The Pt / C membrane electrode and the phenolphthalein-type polyethersulfone anion exchange membrane (SPEEK) are hot-pressed to form a film, and the Pt net current collector is attached, sealed and put into a single fuel cell mold. with pure N 2 Perform cathode and anode area purge, control the operating temperature range of the fuel cell at 20°C, and polarize. Will store 99.9% NH 3 The gas cylinder is opened, the mass flow meter controls the flow rate to 100ml / min, and the cathode is fed into O 2 , the intake flow rate is 70ml / min. Before closing the circuit, measure the open circuit voltage with an electronic multimeter to be 0.60V; close the circuit, adjust the load to 15Ω, and the maximum output current is 30mA. During the test, deionized water was continuously added dropwise on the upper end of the ion exchange membrane to keep the ion exchange membrane in a wet state.

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