電漿熔射噴塗法製備固態氧化物燃料電池Ni/CeO2陽極之製程與性質探討

Investigations on processes and characteristics of plasma sprayed SOFC Ni/CeO2 anode

陳育鈞(Yu-Chun Chen)

指導教授 ： 楊永欽

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

https://doi.org/10.6841/NTUT.2010.00242

摘要

本研究主要為利用大氣電漿熔射噴塗技術製備具多孔結構之固態氧化物燃料電池陽極塗層，希望塗層孔利率可達30%以上且均勻分佈，在此藉由大氣電漿熔射噴塗技術，可以快速製備出具所需之多孔結構陽極塗層。本研究運用碳黑、碳酸鈉與PMMA等粉末作為造孔劑經由噴霧造粒與過篩造粒等方式製備起始複合粉末，再藉由大氣電漿噴塗技術噴覆具多孔結構之固態氧化物燃料電池鎳/氧化鈰陽極塗層。並由實驗結果可得知，加入碳酸鈉粉末為造孔劑時所噴覆的塗層孔隙率含量最高，且在5%氫氣氣氛下還原後孔隙率可達34.1%，且在塗層與基材結合強度方面，在5%氫氣氣氛還原後塗層的結合強度仍可維持為26.5 MPa。在塗層電性方面，鎳/氧化鈰多孔結構之陽極塗層的電子導電率在700℃時可達到200 S/cm。再藉由拉曼光譜儀得知經由大氣電漿噴塗後陽極塗層之氧化鈰元素皆能保持Ce4+的價數，且經由不同功率之噴塗參數噴覆後塗層氧空缺的變化，會隨著噴塗功率的增加、噴塗趟數越多，氧空缺也會隨之增加，但經由氫氣還原後會使氧空缺含量減少；分析結果可以得知，造孔劑的添加能確實提升塗層孔隙率，增加三相界面區的反應面積以提高電化學反應速率。

關鍵字

固態氧化物燃料電池 ； 陽極 ； 電漿熔射噴塗

並列摘要

This study is to create a porous structure of anode coatings of solid oxide fuel cell with plasma spray coating by atmospheric plasma spray coating technology; Hope coating porosity up to 30% and dispersion distribution, therefore, with atmospheric plasma spray coating, coated porous anode structure can be created rapidly and successfully. In the study, pore-forming agents, made by powders of carbon, Na2CO3, PMMA, are utilized as starting complex powder to create a porous structure of solid oxide fuel cell Ni/CeO2 anode by using atmospheric plasma spray coating technology.
The experiment indicates that pore coating porosity is up to 34.1% by adding sodium carbonate powder as pore-forming agents, and the bonding strength of coating can maintain 26.5 MPa after reduction of 5% hydrogen. Moreover, in the respect of electrical properties coating, the electronic conductivity of anodic coating with Ni/CeO2 porous structure in the 700℃ approach 200 S/cm.
With Raman spectroscopy, the anodic coating of cerium oxide elements can sustain the number of Ce4 + valence by atmospheric plasma spray coating. In addition, spraying by different powers of spraying parameters, the oxygen vacancy will change. Because of the increase of the spraying powers and the number of coating, the oxygen vacancy increases. Nevertheless, the oxygen vacancy will be reduced by reduction of hydrogen.
As results, this analysis illustrates that adding pore-forming agent can enhance coating porosity, and increase the reaction rate of electrochemy through increasing the reaction area of triple-phase boundary region.

並列關鍵字

SOFC ； Anode ； Plasma spray

參考文獻

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