本文選題：質(zhì)子導(dǎo)體　切入點(diǎn)：固體氧化物燃料電池　出處：《鄭州大學(xué)》2017年碩士論文

【摘要】：能源和環(huán)境問(wèn)題是當(dāng)今社會(huì)發(fā)展所面臨的主要問(wèn)題,開(kāi)發(fā)清潔環(huán)保的新能源成為人類(lèi)實(shí)現(xiàn)可持續(xù)發(fā)展的必然選擇。固體氧化物燃料電池(SOFC)作為一種直接將化學(xué)能轉(zhuǎn)化為電能的裝置,具有能量轉(zhuǎn)化效率高、環(huán)境污染小和燃料適應(yīng)性強(qiáng)等優(yōu)點(diǎn),成為研究熱點(diǎn)之一。傳統(tǒng)SOFC對(duì)工作溫度要求較高,高的工作溫度必將帶來(lái)電極的燒結(jié)退化、界面的擴(kuò)散反應(yīng)以及難以封接等問(wèn)題,因此降低電池操作溫度已成為SOFC的主要研究方向。其中質(zhì)子導(dǎo)體固體氧化物燃料電池(H-SOFC)具有較低的活化能,是實(shí)現(xiàn)SOFC中低溫化的一個(gè)重要途徑。本論文主要研究了不同電解質(zhì)H-SOFC的電化學(xué)性能及不同組分陰極對(duì)電池電化學(xué)性能的影響。第一章,簡(jiǎn)述了SOFC的研究背景、結(jié)構(gòu)類(lèi)型、工作原理、關(guān)鍵材料以及質(zhì)子導(dǎo)體的傳導(dǎo)機(jī)制,并介紹了H-SOFC的發(fā)展現(xiàn)狀和本論文的研究思路。第二章,簡(jiǎn)單介紹了實(shí)驗(yàn)所需藥品與儀器,以及實(shí)驗(yàn)用到的表征方法與測(cè)試手段。第三章,制備了NiO-BaZr0.1Ce0.7Y0.2O3-δ(NiO-BZCY)/BaZr0.1Ce0.7Y0.2O3-δ(BZCY)/Ba0.5Sr0.5FeO3-δ(BSF)-Ce0.8Sm0.2O2-δ(SDC)單電池。采用檸檬酸鹽燃燒法制備了單電池所需初始粉體。通過(guò)XRD對(duì)粉體相結(jié)構(gòu)進(jìn)行分析,得出初始粉體均成相較好,無(wú)明顯雜相產(chǎn)生。單電池的功率測(cè)試表明,750℃下單電池的最大功率密度(MPD)為413.5 mW·cm-2,開(kāi)路電壓(OCV)為0.926 V。對(duì)單電池電化學(xué)阻抗譜的測(cè)試可以看出,750℃下單電池具有較小的極化電阻(Rp),阻值為0.301Ωcm2。通過(guò)掃描電鏡觀察單電池?cái)嗝娴奈⒔Y(jié)構(gòu),進(jìn)一步研究了微結(jié)構(gòu)對(duì)電池性能的影響。第四章,制備了BSF-SDC(7:3,5:5,3:7 wt%)三種復(fù)合陰極材料,主要研究了在以Ba Zr0.1Ce0.7Y0.1Yb0.1O3-δ(BZCYYb)為電解質(zhì)的基礎(chǔ)上,不同陰極組分對(duì)電池性能的影響。XRD檢測(cè)發(fā)現(xiàn)BZCYYb粉體呈現(xiàn)出單一的鈣鈦礦結(jié)構(gòu),陽(yáng)極襯底中的電解質(zhì)BZCYYb和NiO之間相結(jié)構(gòu)獨(dú)立存在。煅燒后的BSF-SDC復(fù)合粉體中BSF和SDC呈分離相,BSF具有立方鈣鈦礦的峰,SDC具有螢石結(jié)構(gòu),說(shuō)明BSF和SDC之間的化學(xué)相容性良好,可以用做復(fù)合陰極材料。熱膨脹性能分析表明三組陰極材料200-750℃的熱膨脹系數(shù)依次為15.8×10-6 K-1,14.5×10-6 K-1和13.6×10-6 K-1,相對(duì)于鈷酸鹽基陰極的熱膨脹系數(shù)較低,更適合用于BZCYYb電解質(zhì)。通過(guò)對(duì)三種陰極單電池的電化學(xué)測(cè)試得出,750℃下BSF-SDC55和BSF-SDC37的最大功率密度為449和388 mW·cm-2,極化電阻為0.021和0.291Ωcm2。相對(duì)而言BSF-SDC73單電池具有較好的電化學(xué)性能,其750℃下的最大功率密度和最低極化電阻分別為531 m W·cm-2和0.019Ωcm2。結(jié)果表明BSF-SDC73復(fù)合陰極可能是一種很有前途的H-SOFC陰極材料,BZCYYb電解質(zhì)材料相較于BZCY表現(xiàn)出更優(yōu)異的電化學(xué)性能。第五章,對(duì)本論文所有工作進(jìn)行了總結(jié),對(duì)質(zhì)子導(dǎo)體固體氧化物燃料電池的發(fā)展及以后的工作進(jìn)行了展望。
[Abstract]:Energy and the environment are the main problems facing the development of today's society. The development of clean and environmentally friendly new energy sources has become an inevitable choice for human to achieve sustainable development. Solid oxide fuel cells (SOFCCs), as a device that directly converts chemical energy into electric energy, has high energy conversion efficiency. The advantages of low environmental pollution and strong fuel adaptability have become one of the research hotspots. Traditional SOFC requires high working temperature, which will lead to the degradation of electrode sintering, diffusion reaction of interface and difficulty in sealing. Therefore, lowering the operating temperature of the cell has become the main research direction of SOFC, in which the proton conductor solid oxide fuel cell (SOFC) has a low activation energy. In this paper, the electrochemical performance of H-SOFC with different electrolytes and the effect of different cathode components on the electrochemical performance of SOFC are studied. In chapter 1, the research background and structure types of SOFC are briefly described. The working principle, the key materials and the conduction mechanism of proton conductors are introduced. The development of H-SOFC and the research ideas of this paper are also introduced. In chapter 3, NiO-BaZr0.1Ce0.7Y0.2O3- 未 -NiO-BZCYP / BaZr0.1Ce0.7Y0.2O3- 未 BZCY-Ba0.5Sr0.5FeO3- 未 BZCY-Ba0.5Sr0.5FeO3- 未 BSF-0.8Sm0.2O2- 未 single cell was prepared by citrate combustion method, and the phase structure of the powder was analyzed by XRD. The maximum power density (MPD) of single cell was 413.5 MW cm-2 and the open circuit voltage was 0.926 V. the electrochemical impedance spectrum of single cell could be seen to be smaller than that of the ordered cell at 750 鈩，

本文編號(hào)：1670076