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A cathode material for direct carbon fuel cell and its manufacture method

A fuel cell cathode and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the interior of the battery and structural parts are corroded by electrolytes, hinder the practical application of DCFC, and have high requirements for electrode materials, and achieve low manufacturing costs. , The effect of promoting industrialization and high output performance

Inactive Publication Date: 2007-05-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem of low power density hinders the practical application of DCFC, so improving power density and current density has become one of the problems that need to be solved in the development of DCFC
In addition, there are inevitably many problems in the operation of direct carbon fuel cells at high temperatures: (1) the cost of operation and maintenance of fuel cells is high when operating at high temperatures; (2) the electrolyte of direct carbon fuel cells generally uses molten alkali or molten carbonate , the temperature rises and the internal and structural parts of the battery are intensified by electrolyte corrosion; (3) High working temperature has higher requirements for electrode materials

Method used

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  • A cathode material for direct carbon fuel cell and its manufacture method

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Embodiment 11

[0033] Embodiment 11 constructs DCFC unit cell

[0034] Weigh analytically pure NaOH, LiOH, KOH, Al(OH)3 , Y 2 o 3 , mixed according to the mole percentage of the electrolyte, NaOH 20-30%, LiOH 10-20%, KOH 40-50%, Al(OH) 3 10-30%, Y 2 o 3 1-15%, after fully mixing, take out and dry as electrolyte. The distance between the anode and the cathode is 0.5-5cm, and the air flow rate of the cathode is 10-100ml / min. The anode material is graphite, and the cathode is the materials of Examples 1-10 respectively. The working temperature is 500℃~630℃. The structure of a direct carbon fuel cell unit cell is shown in Figure 1.

Embodiment 12

[0035] Embodiment 12 power density test

[0036] The rare earth oxide composite cathode material of Example 3 was placed in a DCFC unit cell to test the DCFC volt-ampere characteristic curve. The variation curves of DCFC power density and open circuit voltage with current density were measured at 500°C and 630°C, respectively. Electrode effective area 3.23cm 2 . The volt-ampere characteristics of the battery are shown in Figure 2. It can be seen that the maximum power density of DCFC at 500°C is 70mW / cm 2 , the maximum current density is 328mA / cm 2 ;The maximum power density of DCFC at 630℃ is 102mW / cm 2 , the maximum current density is 467mA / cm 2 . Table 2 shows the experimental parameters and battery performance data of DCFC at 500°C and 630°C.

[0037] Table 2. 500°C and 630°C DCFC parameters and performance

[0038] Operating temperature

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Abstract

The rare earth oxide composite cathode material for direct carbon fuel battery comprises following ingredients as mole percent content: 50-90% Ni, 1-18% Gd2O3, 1-20% CeO2, 0.5-7% La2O3, 1-7% Nd2O3, 0.5-7% Yb2O3, 1-4% ZrO2, and 1-4% MgO. This invention can increase the power density and current density of fuel battery, and reduces battery working temperature.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a direct carbon fuel cell cathode material and a preparation method thereof. Background technique [0002] Direct Carbon Fuel Cell (Direct Carbon Fuel Cell) has high energy conversion efficiency, environmental friendliness (no Sox, NOx emissions, no noise pollution), wide fuel adaptability (coal, coal derivatives and other carbon-containing fossils can be directly used fuel) and other outstanding advantages. Compared with traditional heat engines, direct carbon fuel cells can improve the conversion efficiency of coal and various carbon-containing fossil fuels in energy conversion, and convert the chemical energy of carbon-containing fossil fuels into electrical energy to the greatest extent. [0003] At present, DCFC-related patents and research content in the world are mostly focused on the internal structure of DCFC, optimization of electrolyte composit...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 朱庆山赵立
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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