Bismuth oxide-assisted zirconia-based electrolyte, and preparation method and application thereof

Abstract

The invention provides a bismuth oxide-assisted zirconia-based electrolyte and a preparation method thereof. By adopting the bismuth oxide composite scandium oxide stabilized zirconia electrolyte, the densification sintering temperature can be effectively reduced, and meanwhile, relatively high conductivity can be ensured.

Description

technical field

[0001] The invention relates to the technical field of fuel cells / electrolytic cells, in particular to a bismuth oxide-assisted zirconia-based electrolyte, a preparation method and application thereof. Background technique

[0002] Zirconia-based electrolytes are currently the most widely used electrolyte materials in solid oxide fuel cells (SOFCs) and electrolytic cells (SOECs), among which 10mol% scandia-stabilized zirconia has the highest ionic conductivity and excellent mechanical strength, but scandium The cost of elements is high, and it is one of the problems to be solved urgently to reduce the content of scandium without reducing the ionic conductivity; another major problem of zirconia-based electrolytes is the high sintering temperature during the preparation process, generally higher than 1500 ° C, too much A high sintering temperature is likely to cause excessive growth of grains, which will lead to problems such as overburning of the anode when p...

Examples

Embodiment 1

[0032] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0033] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.01) was dissolved in 0.5mol / L nitric acid solution, heated to 90°C and stirred to make the water gradually volatilize to obtain a jelly;

[0034] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0035] S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyte powder;

[0036] S4: Press the zirconia-based electrolyte powder obtai...

Embodiment 2

[0038] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0039] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.05) was dissolved in 1mol / L nitric acid solution, heated to 90°C and stirred to make the water gradually volatilize to obtain a jelly;

[0040] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0041] S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyte powder;

[0042] S4: Press the zirconia-based electrolyte powder obtaine...

Embodiment 3

[0044] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0045] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.1) is dissolved in 1.5 mol / L nitric acid solution, wherein scandium oxide and bismuth oxide are added in a molar ratio of 90:10, heated to 90°C and stirred to gradually volatilize the water to obtain a jelly ;

[0046] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0047]S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyt...

technical field

[0001] The invention relates to the technical field of fuel cells / electrolytic cells, in particular to a bismuth oxide-assisted zirconia-based electrolyte, a preparation method and application thereof. Background technique

[0002] Zirconia-based electrolytes are currently the most widely used electrolyte materials in solid oxide fuel cells (SOFCs) and electrolytic cells (SOECs), among which 10mol% scandia-stabilized zirconia has the highest ionic conductivity and excellent mechanical strength, but scandium The cost of elements is high, and it is one of the problems to be solved urgently to reduce the content of scandium without reducing the ionic conductivity; another major problem of zirconia-based electrolytes is the high sintering temperature during the preparation process, generally higher than 1500 ° C, too much A high sintering temperature is likely to cause excessive growth of grains, which will lead to problems such as overburning of the anode when p...

Examples

Embodiment 1

[0032] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0033] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.01) was dissolved in 0.5mol / L nitric acid solution, heated to 90°C and stirred to make the water gradually volatilize to obtain a jelly;

[0034] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0035] S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyte powder;

[0036] S4: Press the zirconia-based electrolyte powder obtai...

Embodiment 2

[0038] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0039] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.05) was dissolved in 1mol / L nitric acid solution, heated to 90°C and stirred to make the water gradually volatilize to obtain a jelly;

[0040] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0041] S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyte powder;

[0042] S4: Press the zirconia-based electrolyte powder obtaine...

Embodiment 3

[0044] This example provides a method for preparing a bismuth oxide-assisted zirconia-based electrolyte by using a sol-gel method, and the specific details are as follows:

[0045] S1: zirconium oxynitrate, scandium nitrate, bismuth nitrate, citric acid, ethylenediaminetetraacetic acid according to the target product (Sc 2 o 3 ) 0.06 (Bi 2 o 3 ) x (ZrO 2 ) 0.94–x The stoichiometric ratio of (x=0.1) is dissolved in 1.5 mol / L nitric acid solution, wherein scandium oxide and bismuth oxide are added in a molar ratio of 90:10, heated to 90°C and stirred to gradually volatilize the water to obtain a jelly ;

[0046] S2: Dry the jelly obtained in S1 in an oven at 250°C to form a precursor powder;

[0047]S3: Sintering the precursor obtained in step S2 at a constant temperature of 500° C. for 5 hours, further ball milling the sintered powder for 24 hours, and sieving the powder below 200 mesh to obtain bismuth oxide composite scandium oxide stabilized zirconia-based electrolyt...

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