纳米ScSZ基电解质中低温导电性研究进展

doi:10.19964/j.issn.1006-4990.2020-0369

Abstract

Abstract:

Solid oxide fuel cell（SOFC） is one of the most promising fuel cells,which is efficient and clean and suitable for a variety of fuel gases.Sc₂O₃ doped ZrO₂（ScSZ） series（including single or binary oxides doped ScSZ） makes zirconia-based electrolyte shows excellent ionic conductivity.The nano-crystallization of ScSZ-based electrolyte has been widely studied due to its excellent electrical properties.However,ScSZ-based electrolyte will undergo phase transition at medium and low tem-perature,resulting in rhombic phase with low conductivity,which affects its ionic conductivity.ScSZ electrolytes doped with single or binary oxides were systematically summarized.The results showed that multi-oxides doped ScSZ could effectively pre-vent from phase transformation at medium and low temperatures,stabilize cubic ScSZ.Nano-crystallization ScSZ based elec-trolytes prepared by different methods could improve the ionic conductivity very well.The development direction of ScSZ se-ries in medium and low temperature（600~800 ℃） was proposed：the conductivity of grain and grain boundary could be im-proved through optimizing the doped composition,nano-crystallization and electrolyte materials with novel structures could be prepared by different preparation methods and parameters.

Key words: refined magnesium slag, crushing and winnowing, magnesium beads, ScSZ-based electrolyte, Sc₂O₃, ZrO₂, conductivity

CLC Number:

Liang Tianquan,Guo Yan,Chen Xiyong,Zhan Feng,Zhang Xiuhai,Zeng Jianmin. Research progress of conductivity of nano ScSZ-based electrolyte at medium and low temperature[J]. Inorganic Chemicals Industry, 2021, 53(6): 87-94.

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电解质	制备方法	测试温度/℃	电导率/ （S·cm^-1）
1Ce10ScSZ^[23]	固相合成：1 400 ℃烧结	600	0.046（高纯度） 0.033（低纯度）
1Ce10ScSZ^[24]	1 500 ℃烧结2 h,平均粒径为5.9 μm	800	0.140
1Ce10ScSZ^[25]	甘氨酸-硝酸盐法（MW- GNP）：微波中固溶燃烧合成,700 ℃煅烧2 h,1 300 ℃ 烧结5 h	500~ 800	0.033~ 0.184
1Ce9ScSZ^[12]	固相合成：1 335 ℃煅烧 6 h,1 550 ℃烧结10 h	700 600	0.032 0.018 8
1Ce10ScSZ^[26]	水热法：800 ℃煅烧2 h, 1 400 ℃烧结2 h,平均粒径为20.2 nm	800	0.131
1Ce10ScSZ^[11]	微波烧结法：在微波炉中1 335 ℃烧结15 min	800	0.280
1Ce10ScSZ^[27]	新型固液方法（SLM）： 1 000 ℃煅烧2 h,1 550 ℃煅烧5 h	800	0.140
1Ce10ScSZ^[28]	化学共沉淀法：1 500 ℃烧结5 h	800	0.040
1Ce10ScSZ^[29]	溶胶-凝胶法：600 ℃煅烧24 h,1 500 ℃烧结5 h	600	0.011 4
1Ce10ScSZ^[30]	沉淀-共沸蒸馏法：1 600 ℃ 烧结	800	0.084

电解质	制备方法	测试温度/℃	电导率/ （S·cm^-1）
4Y4ScSZ^[41]	溶胶凝胶-滴涂沉积法：1 000 ℃煅烧6 h,平均直径为144 nm,活化能为0.73 eV	700	0.120
1Eu10ScSZ^[10]	固相合成法：降低β→c转变温度,室温下为立方相	500	0.002
3Mg9ScSZ^[42]	尿素共沉淀合成法：1 200 ℃长时间处理不发生相变, 1 600 ℃ 3 h不影响致密性,相对密度约为97%	700 800	0.028 0.073
1Nb10ScSZ^[43]	固相合成法：1 300 ℃煅烧6 h,1 550 ℃烧结10 h,在650 ℃时比11ScSZ高80%	650 700	0.018 8 0.031 8
3LaScSZ^[44]	化学共沉淀法：800 ℃煅烧5 h, 1 550 ℃烧结6 h,室温下稳定立方相,晶粒为20~30 nm,晶界阻抗降低	500~ 660	0.021~ 0.024
1Mn10ScSZ^[45]	USP（超声喷雾热解）法：1 400 ℃煅烧10 h	800	0.112
1Hf10ScSZ^[46]	固相合成法：1 550 ℃烧结5 h	600	0.008 8

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Research progress of conductivity of nano ScSZ-based electrolyte at medium and low temperature

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