本文關(guān)鍵詞：基于納米CT技術(shù)研究運行后Ni-YSZ陽極三維微結(jié)構(gòu)變化　出處：《核技術(shù)》2016年06期 　論文類型：期刊論文

  更多相關(guān)文章： X射線成像 復(fù)合陽極 三維結(jié)構(gòu) 連通性

【摘要】：固體氧化物燃料電池(Solid Oxide Fuel Cell,SOFC)陽極不僅提供了電化學反應(yīng)的三相界面(Three-phase boundary,TPB)區(qū)域,而且在物質(zhì)傳輸、擴散和燃料電池反應(yīng)中不同物質(zhì)之間的隔離起到積極作用。在運行期間,電極微結(jié)構(gòu)發(fā)生變化。對SOFC陽極微結(jié)構(gòu)演變的研究能夠幫助我們理解長期運行的SOFC性能損失的原因。近年來不斷發(fā)展的X射線納米CT(Computed Tomography)技術(shù)使得可以無損地獲得測試前后的陽極三維微結(jié)構(gòu)。本文利用硬X射線納米CT技術(shù)對Ni-YSZ復(fù)合陽極進行了三維重建,并采用自主開發(fā)的一些定量分析方法來獲得陽極微結(jié)構(gòu)的關(guān)鍵參數(shù),如顆粒尺寸、每種相的體積分數(shù)和連通率等。發(fā)現(xiàn)在電池測試后,Ni顆粒尺寸增大,與之相對是由于Ni顆粒的聚集導(dǎo)致Ni相的連通性和三相界面長度明顯下降。結(jié)果表明,在電池測試過程,Ni顆粒發(fā)生了團聚,電極微結(jié)構(gòu)發(fā)生了改變,進而導(dǎo)致SOFC性能損失。陽極結(jié)構(gòu)的數(shù)據(jù)表明,X射線納米CT技術(shù)能夠作為一個強力工具研究能源材料的微結(jié)構(gòu),為陽極結(jié)構(gòu)優(yōu)化提供重要參考數(shù)據(jù)。
[Abstract]:Solid Oxide Fuel Cell. SOFC) anodes not only provide the three-phase boundary TPBs for electrochemical reactions, but also transport matter in the three-phase interface. Separation between different substances in diffusion and fuel cell reactions plays a positive role. During operation. The study of the evolution of SOFC anode microstructure can help us to understand the reason for the loss of SOFC performance. The recent development of X-ray nanocrystalline CTs (NCTs). Computed Tomography). The 3D microstructures of the anode before and after the test can be obtained without damage by using the hard X-ray nano-CT technique. In this paper, the three-dimensional reconstruction of the Ni-YSZ composite anode is carried out. Some quantitative analysis methods developed by ourselves were used to obtain the key parameters of anode microstructure, such as particle size, volume fraction and connectivity of each phase, etc. It was found that the size of Ni particles increased after battery testing. On the other hand, due to the aggregation of Ni particles, the connectivity of Ni phase and the length of three-phase interface decreased obviously. The results showed that the Ni particles were agglomerated and the electrode microstructure changed during the battery test. The data of anode structure show that X-ray nanocrystalline CT can be used as a powerful tool to study the microstructure of energy materials and provide important reference data for the optimization of anode structure.
【作者單位】： 中國科學技術(shù)大學國家同步輻射實驗室;
【基金】：國家自然科學基金(No.11275204,No.11475175,No.11405175,No.11205189) 國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)(No.2012CB825804)資助~~
【分類號】：TM911.4
【正文快照】： 固體氧化物燃料電池(Solid Oxide Fuel Cell,SOFC)是一種將燃料的化學能直接轉(zhuǎn)化為電能的能源裝置,它具有能量轉(zhuǎn)化率高、穩(wěn)定性好、燃料氣體種類廣泛和環(huán)境友好等優(yōu)點[1]。SOFC陽極一般采用由金屬Ni和氧離子導(dǎo)體材料氧化釔穩(wěn)定氧化鋯(Yttria-stabilized zirconia,YSZ)構(gòu)成的復(fù)

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